Merge branch 'angles' into 'next'

Slopes and stuff

Adds support for slopes, slopes on FOFs, slopes on translucent FOFs, slopes on FOFs with holes in the flat, slope physics, dynamic slopes, vertex slopes, dynamic vertex slopes, and a ham sandwich to the game. Only for software mode right now, though. (OGL still gets the physics and the sandwich.) Some things still need to be done, but for now this can be merged in to be finished later.

Please make sure nothing in the vanilla game breaks before giving the thumbs up for this merge.

Since this doesn't merge automatically, if the code review turns out positive and nobody else has done it, I'll handle the merging.

See merge request !22

src/CMakeLists.txt

@@ -150,6 +150,7 @@ set(SRB2_CORE_GAME_SOURCES
 	p_saveg.c
 	p_setup.c
 	p_sight.c
+	p_slopes.c
 	p_spec.c
 	p_telept.c
 	p_tick.c
@@ -162,6 +163,7 @@ set(SRB2_CORE_GAME_SOURCES
 	p_pspr.h
 	p_saveg.h
 	p_setup.h
+	p_slopes.h
 	p_spec.h
 	p_tick.h
 )

src/Makefile

@@ -454,6 +454,7 @@ OBJS:=$(i_main_o) \
 		$(OBJDIR)/p_telept.o \
 		$(OBJDIR)/p_tick.o   \
 		$(OBJDIR)/p_user.o   \
+		$(OBJDIR)/p_slopes.o \
 		$(OBJDIR)/tables.o   \
 		$(OBJDIR)/r_bsp.o    \
 		$(OBJDIR)/r_data.o   \

src/doomdef.h

@@ -439,6 +439,9 @@ extern const char *compdate, *comptime, *comprevision;
 ///	Fun experimental slope stuff!
 //#define SLOPENESS
 
+/// Kalaron/Eternity Engine slope code (SRB2CB ported)
+#define ESLOPE
+
 ///	Delete file while the game is running.
 ///	\note	EXTREMELY buggy, tends to crash game.
 //#define DELFILE

src/f_finale.c

@@ -982,6 +982,7 @@ static const char *credits[] = {
 	"",
 	"\1Programming",
 	"\1Assistance",
+	"\"chi.miru\"", // Red's secret weapon, the REAL reason slopes exist (also helped port drawing code from ZDoom)
 	"Andrew \"orospakr\" Clunis",
 	"Gregor \"Oogaland\" Dick",
 	"Julio \"Chaos Zero 64\" Guir",

src/m_fixed.c

@@ -119,8 +119,6 @@ fixed_t FixedHypot(fixed_t x, fixed_t y)
 	return FixedMul(ax, yx1); // |x|*((1 + (x/y)^2)^1/2)
 }
 
-#ifdef NEED_FIXED_VECTOR
-
 vector2_t *FV2_Load(vector2_t *vec, fixed_t x, fixed_t y)
 {
 	vec->x = x;
@@ -863,8 +861,6 @@ void FM_Scale(matrix_t *dest, fixed_t x, fixed_t y, fixed_t z)
 #undef M
 }
 
-#endif
-
 #ifdef M_TESTCASE
 //#define MULDIV_TEST
 #define SQRT_TEST

src/m_fixed.h

@@ -357,8 +357,6 @@ FUNCMATH FUNCINLINE static ATTRINLINE fixed_t FixedRound(fixed_t x)
 	return INT32_MAX;
 }
 
-#ifdef NEED_FIXED_VECTOR
-
 typedef struct
 {
 	fixed_t x;
@@ -437,6 +435,4 @@ void FM_MultMatrix(matrix_t *dest, const matrix_t *multme);
 void FM_Translate(matrix_t *dest, fixed_t x, fixed_t y, fixed_t z);
 void FM_Scale(matrix_t *dest, fixed_t x, fixed_t y, fixed_t z);
 
-#endif // defined NEED_FIXED_VECTOR
-
 #endif //m_fixed.h

src/p_enemy.c

@@ -5606,8 +5606,13 @@ void A_MixUp(mobj_t *actor)
 
 				P_SetThingPosition(players[i].mo);
 
+#ifdef ESLOPE
+				players[i].mo->floorz = P_GetFloorZ(players[i].mo, players[i].mo->subsector->sector, players[i].mo->x, players[i].mo->y, NULL);
+				players[i].mo->ceilingz = P_GetCeilingZ(players[i].mo, players[i].mo->subsector->sector, players[i].mo->x, players[i].mo->y, NULL);
+#else
 				players[i].mo->floorz = players[i].mo->subsector->sector->floorheight;
 				players[i].mo->ceilingz = players[i].mo->subsector->sector->ceilingheight;
+#endif
 
 				P_CheckPosition(players[i].mo, players[i].mo->x, players[i].mo->y);
 			}

src/p_floor.c

@@ -1174,12 +1174,15 @@ void T_SpikeSector(levelspecthink_t *spikes)
 
 		if (affectsec == spikes->sector) // Applied to an actual sector
 		{
+			fixed_t affectfloor = P_GetSpecialBottomZ(thing, affectsec, affectsec);
+			fixed_t affectceil = P_GetSpecialTopZ(thing, affectsec, affectsec);
+
 			if (affectsec->flags & SF_FLIPSPECIAL_FLOOR)
 			{
 				if (!(thing->eflags & MFE_VERTICALFLIP) && thing->momz > 0)
 					continue;
 
-				if (thing->z == affectsec->floorheight)
+				if (thing->z == affectfloor)
 					dothepain = true;
 			}
 
@@ -1188,18 +1191,20 @@ void T_SpikeSector(levelspecthink_t *spikes)
 				if ((thing->eflags & MFE_VERTICALFLIP) && thing->momz < 0)
 					continue;
 
-				if (thing->z + thing->height == affectsec->ceilingheight)
+				if (thing->z + thing->height == affectceil)
 					dothepain = true;
 			}
 		}
 		else
 		{
+			fixed_t affectfloor = P_GetSpecialBottomZ(thing, affectsec, spikes->sector);
+			fixed_t affectceil = P_GetSpecialTopZ(thing, affectsec, spikes->sector);
 			if (affectsec->flags & SF_FLIPSPECIAL_FLOOR)
 			{
 				if (!(thing->eflags & MFE_VERTICALFLIP) && thing->momz > 0)
 					continue;
 
-				if (thing->z == affectsec->ceilingheight)
+				if (thing->z == affectceil)
 					dothepain = true;
 			}
 
@@ -1208,7 +1213,7 @@ void T_SpikeSector(levelspecthink_t *spikes)
 				if ((thing->eflags & MFE_VERTICALFLIP) && thing->momz < 0)
 					continue;
 
-				if (thing->z + thing->height == affectsec->floorheight)
+				if (thing->z + thing->height == affectfloor)
 					dothepain = true;
 			}
 		}
@@ -2087,6 +2092,7 @@ void T_EachTimeThinker(levelspecthink_t *eachtime)
 	boolean FOFsector = false;
 	boolean inAndOut = false;
 	boolean floortouch = false;
+	fixed_t bottomheight, topheight;
 
 	for (i = 0; i < MAXPLAYERS; i++)
 	{
@@ -2151,10 +2157,13 @@ void T_EachTimeThinker(levelspecthink_t *eachtime)
 					if (players[j].mo->subsector->sector != targetsec)
 						continue;
 
-					if (players[j].mo->z > sec->ceilingheight)
+					topheight = P_GetSpecialTopZ(players[j].mo, sec, targetsec);
+					bottomheight = P_GetSpecialBottomZ(players[j].mo, sec, targetsec);
+
+					if (players[j].mo->z > topheight)
 						continue;
 
-					if (players[j].mo->z + players[j].mo->height < sec->floorheight)
+					if (players[j].mo->z + players[j].mo->height < bottomheight)
 						continue;
 
 					if (floortouch == true && P_IsObjectOnGroundIn(players[j].mo, targetsec))
@@ -2314,7 +2323,7 @@ void T_RaiseSector(levelspecthink_t *raise)
 			if (raise->vars[1] && !(thing->player->pflags & PF_STARTDASH))
 				continue;
 
-			if (!(thing->z == raise->sector->ceilingheight))
+			if (!(thing->z == P_GetSpecialTopZ(thing, raise->sector, sector)))
 				continue;
 
 			playeronme = true;

src/p_local.h

@@ -217,6 +217,23 @@ boolean P_RailThinker(mobj_t *mobj);
 void P_PushableThinker(mobj_t *mobj);
 void P_SceneryThinker(mobj_t *mobj);
 
+
+fixed_t P_MobjFloorZ(mobj_t *mobj, sector_t *sector, sector_t *boundsec, fixed_t x, fixed_t y, line_t *line, boolean lowest, boolean perfect);
+fixed_t P_MobjCeilingZ(mobj_t *mobj, sector_t *sector, sector_t *boundsec, fixed_t x, fixed_t y, line_t *line, boolean lowest, boolean perfect);
+#define P_GetFloorZ(mobj, sector, x, y, line) P_MobjFloorZ(mobj, sector, NULL, x, y, line, false, false)
+#define P_GetCeilingZ(mobj, sector, x, y, line) P_MobjCeilingZ(mobj, sector, NULL, x, y, line, true, false)
+#define P_GetFOFTopZ(mobj, sector, fof, x, y, line) P_MobjCeilingZ(mobj, sectors + fof->secnum, sector, x, y, line, false, false)
+#define P_GetFOFBottomZ(mobj, sector, fof, x, y, line) P_MobjFloorZ(mobj, sectors + fof->secnum, sector, x, y, line, true, false)
+#define P_GetSpecialBottomZ(mobj, src, bound) P_MobjFloorZ(mobj, src, bound, mobj->x, mobj->y, NULL, src != bound, true)
+#define P_GetSpecialTopZ(mobj, src, bound) P_MobjCeilingZ(mobj, src, bound, mobj->x, mobj->y, NULL, src == bound, true)
+
+fixed_t P_CameraFloorZ(camera_t *mobj, sector_t *sector, sector_t *boundsec, fixed_t x, fixed_t y, line_t *line, boolean lowest, boolean perfect);
+fixed_t P_CameraCeilingZ(camera_t *mobj, sector_t *sector, sector_t *boundsec, fixed_t x, fixed_t y, line_t *line, boolean lowest, boolean perfect);
+#define P_CameraGetFloorZ(mobj, sector, x, y, line) P_CameraFloorZ(mobj, sector, NULL, x, y, line, false, false)
+#define P_CameraGetCeilingZ(mobj, sector, x, y, line) P_CameraCeilingZ(mobj, sector, NULL, x, y, line, true, false)
+#define P_CameraGetFOFTopZ(mobj, sector, fof, x, y, line) P_CameraCeilingZ(mobj, sectors + fof->secnum, sector, x, y, line, false, false)
+#define P_CameraGetFOFBottomZ(mobj, sector, fof, x, y, line) P_CameraFloorZ(mobj, sectors + fof->secnum, sector, x, y, line, true, false)
+
 boolean P_InsideANonSolidFFloor(mobj_t *mobj, ffloor_t *rover);
 boolean P_CheckDeathPitCollide(mobj_t *mo);
 boolean P_CheckSolidLava(mobj_t *mo, ffloor_t *rover);
@@ -278,6 +295,11 @@ extern fixed_t tmfloorz;
 extern fixed_t tmceilingz;
 extern mobj_t *tmfloorthing, *tmhitthing, *tmthing;
 extern camera_t *mapcampointer;
+extern fixed_t tmx;
+extern fixed_t tmy;
+#ifdef ESLOPE
+extern pslope_t *tmfloorslope, *tmceilingslope;
+#endif
 
 /* cphipps 2004/08/30 */
 extern void P_MapStart(void);

src/p_map.c

@@ -27,6 +27,10 @@
 
 #include "r_splats.h"
 
+#ifdef ESLOPE
+#include "p_slopes.h"
+#endif
+
 #include "z_zone.h"
 
 #include "lua_hook.h"
@@ -34,8 +38,8 @@
 fixed_t tmbbox[4];
 mobj_t *tmthing;
 static INT32 tmflags;
-static fixed_t tmx;
+fixed_t tmx;
-static fixed_t tmy;
+fixed_t tmy;
 
 static precipmobj_t *tmprecipthing;
 static fixed_t preciptmbbox[4];
@@ -48,6 +52,9 @@ fixed_t tmfloorz, tmceilingz;
 static fixed_t tmdropoffz, tmdrpoffceilz; // drop-off floor/ceiling heights
 mobj_t *tmfloorthing; // the thing corresponding to tmfloorz or NULL if tmfloorz is from a sector
 mobj_t *tmhitthing; // the solid thing you bumped into (for collisions)
+#ifdef ESLOPE
+pslope_t *tmfloorslope, *tmceilingslope;
+#endif
 
 // keep track of the line that lowers the ceiling,
 // so missiles don't explode against sky hack walls
@@ -957,6 +964,9 @@ static boolean PIT_CheckThing(mobj_t *thing)
 				if (thing->z + thing->height > tmfloorz)
 				{
 					tmfloorz = thing->z + thing->height;
+#ifdef ESLOPE
+					tmfloorslope = NULL;
+#endif
 				}
 				return true;
 			}
@@ -975,6 +985,9 @@ static boolean PIT_CheckThing(mobj_t *thing)
 			else if (topz < tmceilingz && tmthing->z+tmthing->height <= thing->z+thing->height)
 			{
 				tmceilingz = topz;
+#ifdef ESLOPE
+				tmceilingslope = NULL;
+#endif
 				tmfloorthing = thing; // thing we may stand on
 			}
 		}
@@ -988,6 +1001,9 @@ static boolean PIT_CheckThing(mobj_t *thing)
 				if (thing->z < tmceilingz)
 				{
 					tmceilingz = thing->z;
+#ifdef ESLOPE
+					tmceilingslope = NULL;
+#endif
 				}
 				return true;
 			}
@@ -1005,6 +1021,9 @@ static boolean PIT_CheckThing(mobj_t *thing)
 			else if (topz > tmfloorz && tmthing->z >= thing->z)
 			{
 				tmfloorz = topz;
+#ifdef ESLOPE
+				tmfloorslope = NULL;
+#endif
 				tmfloorthing = thing; // thing we may stand on
 			}
 		}
@@ -1127,11 +1146,13 @@ static boolean PIT_CheckLine(line_t *ld)
 	{
 		tmceilingz = opentop;
 		ceilingline = ld;
+		tmceilingslope = opentopslope;
 	}
 
 	if (openbottom > tmfloorz)
 	{
 		tmfloorz = openbottom;
+		tmfloorslope = openbottomslope;
 	}
 
 	if (highceiling > tmdrpoffceilz)
@@ -1208,8 +1229,12 @@ boolean P_CheckPosition(mobj_t *thing, fixed_t x, fixed_t y)
 	// that contains the point.
 	// Any contacted lines the step closer together
 	// will adjust them.
-	tmfloorz = tmdropoffz = newsubsec->sector->floorheight;
+	tmfloorz = tmdropoffz = P_GetFloorZ(thing, newsubsec->sector, x, y, NULL); //newsubsec->sector->floorheight;
-	tmceilingz = tmdrpoffceilz = newsubsec->sector->ceilingheight;
+	tmceilingz = P_GetCeilingZ(thing, newsubsec->sector, x, y, NULL); //newsubsec->sector->ceilingheight;
+#ifdef ESLOPE
+	tmfloorslope = newsubsec->sector->f_slope;
+	tmceilingslope = newsubsec->sector->c_slope;
+#endif
 
 	// Check list of fake floors and see if tmfloorz/tmceilingz need to be altered.
 	if (newsubsec->sector->ffloors)
@@ -1223,32 +1248,43 @@ boolean P_CheckPosition(mobj_t *thing, fixed_t x, fixed_t y)
 			if (!(rover->flags & FF_EXISTS))
 				continue;
 
+			fixed_t topheight = P_GetFOFTopZ(thing, newsubsec->sector, rover, x, y, NULL);
+			fixed_t bottomheight = P_GetFOFBottomZ(thing, newsubsec->sector, rover, x, y, NULL);
+
 			if (rover->flags & FF_GOOWATER && !(thing->flags & MF_NOGRAVITY))
 			{
 				// If you're inside goowater and slowing down
 				fixed_t sinklevel = FixedMul(thing->info->height/6, thing->scale);
 				fixed_t minspeed = FixedMul(thing->info->height/9, thing->scale);
-				if (thing->z < *rover->topheight && *rover->bottomheight < thingtop
+				if (thing->z < topheight && bottomheight < thingtop
 				&& abs(thing->momz) < minspeed)
 				{
 					// Oh no! The object is stick in between the surface of the goo and sinklevel! help them out!
-					if (!(thing->eflags & MFE_VERTICALFLIP) && thing->z > *rover->topheight - sinklevel
+					if (!(thing->eflags & MFE_VERTICALFLIP) && thing->z > topheight - sinklevel
 					&& thing->momz >= 0 && thing->momz < (minspeed>>2))
 						thing->momz += minspeed>>2;
-					else if (thing->eflags & MFE_VERTICALFLIP && thingtop < *rover->bottomheight + sinklevel
+					else if (thing->eflags & MFE_VERTICALFLIP && thingtop < bottomheight + sinklevel
 					&& thing->momz <= 0 && thing->momz > -(minspeed>>2))
 						thing->momz -= minspeed>>2;
 
 					// Land on the top or the bottom, depending on gravity flip.
-					if (!(thing->eflags & MFE_VERTICALFLIP) && thing->z >= *rover->topheight - sinklevel && thing->momz <= 0)
+					if (!(thing->eflags & MFE_VERTICALFLIP) && thing->z >= topheight - sinklevel && thing->momz <= 0)
 					{
-						if (tmfloorz < *rover->topheight - sinklevel)
+						if (tmfloorz < topheight - sinklevel) {
-							tmfloorz = *rover->topheight - sinklevel;
+							tmfloorz = topheight - sinklevel;
+#ifdef ESLOPE
+							tmfloorslope = *rover->t_slope;
+#endif
+						}
 					}
-					else if (thing->eflags & MFE_VERTICALFLIP && thingtop <= *rover->bottomheight + sinklevel && thing->momz >= 0)
+					else if (thing->eflags & MFE_VERTICALFLIP && thingtop <= bottomheight + sinklevel && thing->momz >= 0)
 					{
-						if (tmceilingz > *rover->bottomheight + sinklevel)
+						if (tmceilingz > bottomheight + sinklevel) {
-							tmceilingz = *rover->bottomheight + sinklevel;
+							tmceilingz = bottomheight + sinklevel;
+#ifdef ESLOPE
+							tmceilingslope = *rover->b_slope;
+#endif
+						}
 					}
 				}
 				continue;
@@ -1265,30 +1301,40 @@ boolean P_CheckPosition(mobj_t *thing, fixed_t x, fixed_t y)
 
 			if (rover->flags & FF_QUICKSAND)
 			{
-				if (thing->z < *rover->topheight && *rover->bottomheight < thingtop)
+				if (thing->z < topheight && bottomheight < thingtop)
 				{
-					if (tmfloorz < thing->z)
+					if (tmfloorz < thing->z) {
 						tmfloorz = thing->z;
+#ifdef ESLOPE
+						tmfloorslope = NULL;
+#endif
+					}
 				}
 				// Quicksand blocks never change heights otherwise.
 				continue;
 			}
 
-			delta1 = thing->z - (*rover->bottomheight
+			delta1 = thing->z - (bottomheight
-				+ ((*rover->topheight - *rover->bottomheight)/2));
+				+ ((topheight - bottomheight)/2));
-			delta2 = thingtop - (*rover->bottomheight
+			delta2 = thingtop - (bottomheight
-				+ ((*rover->topheight - *rover->bottomheight)/2));
+				+ ((topheight - bottomheight)/2));
 
-			if (*rover->topheight > tmfloorz && abs(delta1) < abs(delta2)
+			if (topheight > tmfloorz && abs(delta1) < abs(delta2)
 				&& !(rover->flags & FF_REVERSEPLATFORM))
 			{
-				tmfloorz = tmdropoffz = *rover->topheight;
+				tmfloorz = tmdropoffz = topheight;
+#ifdef ESLOPE
+				tmfloorslope = *rover->t_slope;
+#endif
 			}
-			if (*rover->bottomheight < tmceilingz && abs(delta1) >= abs(delta2)
+			if (bottomheight < tmceilingz && abs(delta1) >= abs(delta2)
 				&& !(rover->flags & FF_PLATFORM)
 				&& !(thing->type == MT_SKIM && (rover->flags & FF_SWIMMABLE)))
 			{
-				tmceilingz = tmdrpoffceilz = *rover->bottomheight;
+				tmceilingz = tmdrpoffceilz = bottomheight;
+#ifdef ESLOPE
+				tmceilingslope = *rover->b_slope;
+#endif
 			}
 		}
 	}
@@ -1361,11 +1407,19 @@ boolean P_CheckPosition(mobj_t *thing, fixed_t x, fixed_t y)
 						delta1 = thing->z - (polybottom + ((polytop - polybottom)/2));
 						delta2 = thingtop - (polybottom + ((polytop - polybottom)/2));
 
-						if (polytop > tmfloorz && abs(delta1) < abs(delta2))
+						if (polytop > tmfloorz && abs(delta1) < abs(delta2)) {
 							tmfloorz = tmdropoffz = polytop;
+#ifdef ESLOPE
+							tmfloorslope = NULL;
+#endif
+						}
 
-						if (polybottom < tmceilingz && abs(delta1) >= abs(delta2))
+						if (polybottom < tmceilingz && abs(delta1) >= abs(delta2)) {
 							tmceilingz = tmdrpoffceilz = polybottom;
+#ifdef ESLOPE
+							tmceilingslope = NULL;
+#endif
+						}
 					}
 					plink = (polymaplink_t *)(plink->link.next);
 				}
@@ -1467,8 +1521,9 @@ boolean P_CheckCameraPosition(fixed_t x, fixed_t y, camera_t *thiscam)
 	// that contains the point.
 	// Any contacted lines the step closer together
 	// will adjust them.
-	tmfloorz = tmdropoffz = newsubsec->sector->floorheight;
+	tmfloorz = tmdropoffz = P_CameraGetFloorZ(thiscam, newsubsec->sector, x, y, NULL);
-	tmceilingz = tmdrpoffceilz = newsubsec->sector->ceilingheight;
+
+	tmceilingz = P_CameraGetCeilingZ(thiscam, newsubsec->sector, x, y, NULL);
 
 	// Cameras use the heightsec's heights rather then the actual sector heights.
 	// If you can see through it, why not move the camera through it too?
@@ -1497,17 +1552,20 @@ boolean P_CheckCameraPosition(fixed_t x, fixed_t y, camera_t *thiscam)
 			if (!(rover->flags & FF_BLOCKOTHERS) || !(rover->flags & FF_EXISTS) || !(rover->flags & FF_RENDERALL) || GETSECSPECIAL(rover->master->frontsector->special, 4) == 12)
 				continue;
 
-			delta1 = thiscam->z - (*rover->bottomheight
+			fixed_t topheight = P_CameraGetFOFTopZ(thiscam, newsubsec->sector, rover, x, y, NULL);
-				+ ((*rover->topheight - *rover->bottomheight)/2));
+			fixed_t bottomheight = P_CameraGetFOFBottomZ(thiscam, newsubsec->sector, rover, x, y, NULL);
-			delta2 = thingtop - (*rover->bottomheight
+
-				+ ((*rover->topheight - *rover->bottomheight)/2));
+			delta1 = thiscam->z - (bottomheight
-			if (*rover->topheight > tmfloorz && abs(delta1) < abs(delta2))
+				+ ((topheight - bottomheight)/2));
+			delta2 = thingtop - (bottomheight
+				+ ((topheight - bottomheight)/2));
+			if (topheight > tmfloorz && abs(delta1) < abs(delta2))
 			{
-				tmfloorz = tmdropoffz = *rover->topheight;
+				tmfloorz = tmdropoffz = topheight;
 			}
-			if (*rover->bottomheight < tmceilingz && abs(delta1) >= abs(delta2))
+			if (bottomheight < tmceilingz && abs(delta1) >= abs(delta2))
 			{
-				tmceilingz = tmdrpoffceilz = *rover->bottomheight;
+				tmceilingz = tmdrpoffceilz = bottomheight;
 			}
 		}
 	}
@@ -1702,8 +1760,8 @@ boolean P_TryCameraMove(fixed_t x, fixed_t y, camera_t *thiscam)
 	}
 	else
 	{
-		tmfloorz = thiscam->subsector->sector->floorheight;
+		tmfloorz = P_CameraGetFloorZ(thiscam, thiscam->subsector->sector, x, y, NULL);
-		tmceilingz = thiscam->subsector->sector->ceilingheight;
+		tmceilingz = P_CameraGetCeilingZ(thiscam, thiscam->subsector->sector, x, y, NULL);
 	}
 
 	// the move is ok,
@@ -1769,6 +1827,10 @@ boolean PIT_PushableMoved(mobj_t *thing)
 		mobj_t *oldthing = tmthing;
 		line_t *oldceilline = ceilingline;
 		line_t *oldblockline = blockingline;
+#ifdef ESLOPE
+		pslope_t *oldfslope = tmfloorslope;
+		pslope_t *oldcslope = tmceilingslope;
+#endif
 
 		// Move the player
 		P_TryMove(thing, thing->x+stand->momx, thing->y+stand->momy, true);
@@ -1781,6 +1843,10 @@ boolean PIT_PushableMoved(mobj_t *thing)
 		P_SetTarget(&tmthing, oldthing);
 		ceilingline = oldceilline;
 		blockingline = oldblockline;
+#ifdef ESLOPE
+		tmfloorslope = oldfslope;
+		tmceilingslope = oldcslope;
+#endif
 		thing->momz = stand->momz;
 	}
 	else
@@ -1802,6 +1868,9 @@ boolean P_TryMove(mobj_t *thing, fixed_t x, fixed_t y, boolean allowdropoff)
 	fixed_t tryy = thing->y;
 	fixed_t radius = thing->radius;
 	fixed_t thingtop = thing->z + thing->height;
+#ifdef ESLOPE
+	fixed_t startingonground = P_IsObjectOnGround(thing);
+#endif
 	floatok = false;
 
 	if (radius < MAXRADIUS/2)
@@ -1890,13 +1959,23 @@ boolean P_TryMove(mobj_t *thing, fixed_t x, fixed_t y, boolean allowdropoff)
 				{
 					if (thingtop == thing->ceilingz && tmceilingz > thingtop && tmceilingz - thingtop <= maxstep)
 					{
-						thing->z = tmceilingz - thing->height;
+						thing->z = (thing->ceilingz = thingtop = tmceilingz) - thing->height;
+						thing->eflags |= MFE_JUSTSTEPPEDDOWN;
+					}
+					else if (tmceilingz < thingtop && thingtop - tmceilingz <= maxstep)
+					{
+						thing->z = (thing->ceilingz = thingtop = tmceilingz) - thing->height;
 						thing->eflags |= MFE_JUSTSTEPPEDDOWN;
 					}
 				}
 				else if (thing->z == thing->floorz && tmfloorz < thing->z && thing->z - tmfloorz <= maxstep)
 				{
-					thing->z = tmfloorz;
+					thing->z = thing->floorz = tmfloorz;
+					thing->eflags |= MFE_JUSTSTEPPEDDOWN;
+				}
+				else if (tmfloorz > thing->z && tmfloorz - thing->z <= maxstep)
+				{
+					thing->z = thing->floorz = tmfloorz;
 					thing->eflags |= MFE_JUSTSTEPPEDDOWN;
 				}
 			}
@@ -1967,6 +2046,25 @@ boolean P_TryMove(mobj_t *thing, fixed_t x, fixed_t y, boolean allowdropoff)
 
 	thing->floorz = tmfloorz;
 	thing->ceilingz = tmceilingz;
+
+#ifdef ESLOPE
+	// Assign thing's standingslope if needed
+	if (thing->z <= tmfloorz && !(thing->eflags & MFE_VERTICALFLIP)) {
+		if (!startingonground && tmfloorslope)
+			P_HandleSlopeLanding(thing, tmfloorslope);
+
+		if (thing->momz <= 0)
+			thing->standingslope = tmfloorslope;
+	}
+	else if (thing->z+thing->height >= tmceilingz && (thing->eflags & MFE_VERTICALFLIP)) {
+		if (!startingonground && tmceilingslope)
+			P_HandleSlopeLanding(thing, tmceilingslope);
+
+		if (thing->momz >= 0)
+			thing->standingslope = tmceilingslope;
+	}
+#endif
+
 	thing->x = x;
 	thing->y = y;
 
@@ -1982,6 +2080,7 @@ boolean P_TryMove(mobj_t *thing, fixed_t x, fixed_t y, boolean allowdropoff)
 boolean P_SceneryTryMove(mobj_t *thing, fixed_t x, fixed_t y)
 {
 	fixed_t tryx, tryy;
+
 	tryx = thing->x;
 	tryy = thing->y;
 	do {
@@ -2304,15 +2403,25 @@ static boolean P_IsClimbingValid(player_t *player, angle_t angle)
 {
 	fixed_t platx, platy;
 	subsector_t *glidesector;
+	fixed_t floorz, ceilingz;
 
 	platx = P_ReturnThrustX(player->mo, angle, player->mo->radius + FixedMul(8*FRACUNIT, player->mo->scale));
 	platy = P_ReturnThrustY(player->mo, angle, player->mo->radius + FixedMul(8*FRACUNIT, player->mo->scale));
 
 	glidesector = R_PointInSubsector(player->mo->x + platx, player->mo->y + platy);
 
+#ifdef ESLOPE
+	floorz = glidesector->sector->f_slope ? P_GetZAt(glidesector->sector->f_slope, player->mo->x, player->mo->y) : glidesector->sector->floorheight;
+	ceilingz = glidesector->sector->c_slope ? P_GetZAt(glidesector->sector->c_slope, player->mo->x, player->mo->y) : glidesector->sector->ceilingheight;
+#else
+	floorz = glidesector->sector->floorheight;
+	ceilingz = glidesector->sector->ceilingheight;
+#endif
+
 	if (glidesector->sector != player->mo->subsector->sector)
 	{
 		boolean floorclimb = false;
+		fixed_t topheight, bottomheight;
 
 		if (glidesector->sector->ffloors)
 		{
@@ -2322,34 +2431,44 @@ static boolean P_IsClimbingValid(player_t *player, angle_t angle)
 				if (!(rover->flags & FF_EXISTS) || !(rover->flags & FF_BLOCKPLAYER))
 					continue;
 
+				topheight = *rover->topheight;
+				bottomheight = *rover->bottomheight;
+
+#ifdef ESLOPE
+				if (*rover->t_slope)
+					topheight = P_GetZAt(*rover->t_slope, player->mo->x, player->mo->y);
+				if (*rover->b_slope)
+					bottomheight = P_GetZAt(*rover->b_slope, player->mo->x, player->mo->y);
+#endif
+
 				floorclimb = true;
 
 				if (player->mo->eflags & MFE_VERTICALFLIP)
 				{
-					if ((*rover->topheight < player->mo->z + player->mo->height) && ((player->mo->z + player->mo->height + player->mo->momz) < *rover->topheight))
+					if ((topheight < player->mo->z + player->mo->height) && ((player->mo->z + player->mo->height + player->mo->momz) < topheight))
 					{
 						floorclimb = true;
 					}
-					if (*rover->topheight < player->mo->z) // Waaaay below the ledge.
+					if (topheight < player->mo->z) // Waaaay below the ledge.
 					{
 						floorclimb = false;
 					}
-					if (*rover->bottomheight > player->mo->z + player->mo->height - FixedMul(16*FRACUNIT,player->mo->scale))
+					if (bottomheight > player->mo->z + player->mo->height - FixedMul(16*FRACUNIT,player->mo->scale))
 					{
 						floorclimb = false;
 					}
 				}
 				else
 				{
-					if ((*rover->bottomheight > player->mo->z) && ((player->mo->z - player->mo->momz) > *rover->bottomheight))
+					if ((bottomheight > player->mo->z) && ((player->mo->z - player->mo->momz) > bottomheight))
 					{
 						floorclimb = true;
 					}
-					if (*rover->bottomheight > player->mo->z + player->mo->height) // Waaaay below the ledge.
+					if (bottomheight > player->mo->z + player->mo->height) // Waaaay below the ledge.
 					{
 						floorclimb = false;
 					}
-					if (*rover->topheight < player->mo->z + FixedMul(16*FRACUNIT,player->mo->scale))
+					if (topheight < player->mo->z + FixedMul(16*FRACUNIT,player->mo->scale))
 					{
 						floorclimb = false;
 					}
@@ -2362,30 +2481,30 @@ static boolean P_IsClimbingValid(player_t *player, angle_t angle)
 
 		if (player->mo->eflags & MFE_VERTICALFLIP)
 		{
-			if ((glidesector->sector->floorheight <= player->mo->z + player->mo->height)
+			if ((floorz <= player->mo->z + player->mo->height)
-				&& ((player->mo->z + player->mo->height - player->mo->momz) <= glidesector->sector->floorheight))
+				&& ((player->mo->z + player->mo->height - player->mo->momz) <= floorz))
 				floorclimb = true;
 
-			if ((glidesector->sector->floorheight > player->mo->z)
+			if ((floorz > player->mo->z)
 				&& glidesector->sector->floorpic == skyflatnum)
 				return false;
 
-			if ((player->mo->z + player->mo->height - FixedMul(16*FRACUNIT,player->mo->scale) > glidesector->sector->ceilingheight)
+			if ((player->mo->z + player->mo->height - FixedMul(16*FRACUNIT,player->mo->scale) > ceilingz)
-				|| (player->mo->z + player->mo->height <= glidesector->sector->floorheight))
+				|| (player->mo->z + player->mo->height <= floorz))
 				floorclimb = true;
 		}
 		else
 		{
-			if ((glidesector->sector->ceilingheight >= player->mo->z)
+			if ((ceilingz >= player->mo->z)
-				&& ((player->mo->z - player->mo->momz) >= glidesector->sector->ceilingheight))
+				&& ((player->mo->z - player->mo->momz) >= ceilingz))
 				floorclimb = true;
 
-			if ((glidesector->sector->ceilingheight < player->mo->z+player->mo->height)
+			if ((ceilingz < player->mo->z+player->mo->height)
 				&& glidesector->sector->ceilingpic == skyflatnum)
 				return false;
 
-			if ((player->mo->z + FixedMul(16*FRACUNIT,player->mo->scale) < glidesector->sector->floorheight)
+			if ((player->mo->z + FixedMul(16*FRACUNIT,player->mo->scale) < ceilingz)
-				|| (player->mo->z >= glidesector->sector->ceilingheight))
+				|| (player->mo->z >= ceilingz))
 				floorclimb = true;
 		}
 
@@ -2457,6 +2576,7 @@ isblocking:
 		line_t *checkline = li;
 		sector_t *checksector;
 		ffloor_t *rover;
+		fixed_t topheight, bottomheight;
 		boolean fofline = false;
 		INT32 side = P_PointOnLineSide(slidemo->x, slidemo->y, li);
 
@@ -2472,13 +2592,23 @@ isblocking:
 				if (!(rover->flags & FF_EXISTS) || !(rover->flags & FF_BLOCKPLAYER) || (rover->flags & FF_BUSTUP))
 					continue;
 
-				if (*rover->topheight < slidemo->z)
+				topheight = *rover->topheight;
+				bottomheight = *rover->bottomheight;
+
+#ifdef ESLOPE
+				if (*rover->t_slope)
+					topheight = P_GetZAt(*rover->t_slope, slidemo->x, slidemo->y);
+				if (*rover->b_slope)
+					bottomheight = P_GetZAt(*rover->b_slope, slidemo->x, slidemo->y);
+#endif
+
+				if (topheight < slidemo->z)
 					continue;
 
-				if (*rover->bottomheight > slidemo->z + slidemo->height)
+				if (bottomheight > slidemo->z + slidemo->height)
 					continue;
 
-				// Got this far, so I guess it's climbable.
+				// Got this far, so I guess it's climbable. // TODO: Climbing check, also, better method to do this?
 				if (rover->master->flags & ML_TFERLINE)
 				{
 					size_t linenum = li-checksector->lines[0];
@@ -3098,6 +3228,7 @@ static boolean PIT_ChangeSector(mobj_t *thing, boolean realcrush)
 		if (thing->subsector->sector->ffloors && (realcrush || thing->flags & MF_PUSHABLE))
 		{
 			ffloor_t *rover;
+			fixed_t topheight, bottomheight;
 			fixed_t delta1, delta2;
 			INT32 thingtop = thing->z + thing->height;
 
@@ -3107,9 +3238,19 @@ static boolean PIT_ChangeSector(mobj_t *thing, boolean realcrush)
 				|| ((rover->flags & FF_BLOCKOTHERS) && !thing->player)) || !(rover->flags & FF_EXISTS))
 					continue;
 
-				delta1 = thing->z - (*rover->bottomheight + *rover->topheight)/2;
+				topheight = *rover->topheight;
-				delta2 = thingtop - (*rover->bottomheight + *rover->topheight)/2;
+				bottomheight = *rover->bottomheight;
-				if (*rover->bottomheight <= thing->ceilingz && abs(delta1) >= abs(delta2))
+
+/*#ifdef ESLOPE
+				if (rover->t_slope)
+					topheight = P_GetZAt(rover->t_slope, thing->x, thing->y);
+				if (rover->b_slope)
+					bottomheight = P_GetZAt(rover->b_slope, thing->x, thing->y);
+#endif*/
+
+				delta1 = thing->z - (bottomheight + topheight)/2;
+				delta2 = thingtop - (bottomheight + topheight)/2;
+				if (bottomheight <= thing->ceilingz && abs(delta1) >= abs(delta2))
 				{
 					if (thing->flags & MF_PUSHABLE)
 					{
@@ -3787,7 +3928,7 @@ void P_MapEnd(void)
 }
 
 // P_FloorzAtPos
-// Returns the floorz of the XYZ position
+// Returns the floorz of the XYZ position // TODO: Need ceilingpos function too
 // Tails 05-26-2003
 fixed_t P_FloorzAtPos(fixed_t x, fixed_t y, fixed_t z, fixed_t height)
 {
@@ -3808,9 +3949,19 @@ fixed_t P_FloorzAtPos(fixed_t x, fixed_t y, fixed_t z, fixed_t height)
 			if ((!(rover->flags & FF_SOLID || rover->flags & FF_QUICKSAND) || (rover->flags & FF_SWIMMABLE)))
 				continue;
 
+			fixed_t topheight = *rover->topheight;
+			fixed_t bottomheight = *rover->bottomheight;
+
+#ifdef ESLOPE
+			if (*rover->t_slope)
+				topheight = P_GetZAt(*rover->t_slope, x, y);
+			if (*rover->b_slope)
+				bottomheight = P_GetZAt(*rover->b_slope, x, y);
+#endif
+
 			if (rover->flags & FF_QUICKSAND)
 			{
-				if (z < *rover->topheight && *rover->bottomheight < thingtop)
+				if (z < topheight && bottomheight < thingtop)
 				{
 					if (floorz < z)
 						floorz = z;
@@ -3818,10 +3969,10 @@ fixed_t P_FloorzAtPos(fixed_t x, fixed_t y, fixed_t z, fixed_t height)
 				continue;
 			}
 
-			delta1 = z - (*rover->bottomheight + ((*rover->topheight - *rover->bottomheight)/2));
+			delta1 = z - (bottomheight + ((topheight - bottomheight)/2));
-			delta2 = thingtop - (*rover->bottomheight + ((*rover->topheight - *rover->bottomheight)/2));
+			delta2 = thingtop - (bottomheight + ((topheight - bottomheight)/2));
-			if (*rover->topheight > floorz && abs(delta1) < abs(delta2))
+			if (topheight > floorz && abs(delta1) < abs(delta2))
-				floorz = *rover->topheight;
+				floorz = topheight;
 		}
 	}
 

src/p_maputl.c

@@ -322,6 +322,9 @@ fixed_t P_InterceptVector(divline_t *v2, divline_t *v1)
 // OPTIMIZE: keep this precalculated
 //
 fixed_t opentop, openbottom, openrange, lowfloor, highceiling;
+#ifdef ESLOPE
+pslope_t *opentopslope, *openbottomslope;
+#endif
 
 // P_CameraLineOpening
 // P_LineOpening, but for camera
@@ -348,31 +351,56 @@ void P_CameraLineOpening(line_t *linedef)
 	{
 		frontfloor = sectors[front->camsec].floorheight;
 		frontceiling = sectors[front->camsec].ceilingheight;
+#ifdef ESLOPE
+		if (sectors[front->camsec].f_slope) // SRB2CBTODO: ESLOPE (sectors[front->heightsec].f_slope)
+			frontfloor = P_GetZAt(sectors[front->camsec].f_slope, camera.x, camera.y);
+		if (sectors[front->camsec].c_slope)
+			frontceiling = P_GetZAt(sectors[front->camsec].c_slope, camera.x, camera.y);
+#endif
+
 	}
 	else if (front->heightsec >= 0)
 	{
 		frontfloor = sectors[front->heightsec].floorheight;
 		frontceiling = sectors[front->heightsec].ceilingheight;
+#ifdef ESLOPE
+		if (sectors[front->heightsec].f_slope) // SRB2CBTODO: ESLOPE (sectors[front->heightsec].f_slope)
+			frontfloor = P_GetZAt(sectors[front->heightsec].f_slope, camera.x, camera.y);
+		if (sectors[front->heightsec].c_slope)
+			frontceiling = P_GetZAt(sectors[front->heightsec].c_slope, camera.x, camera.y);
+#endif
 	}
 	else
 	{
-		frontfloor = front->floorheight;
+		frontfloor = P_CameraGetFloorZ(mapcampointer, front, tmx, tmy, linedef);
-		frontceiling = front->ceilingheight;
+		frontceiling = P_CameraGetCeilingZ(mapcampointer, front, tmx, tmy, linedef);
 	}
 	if (back->camsec >= 0)
 	{
 		backfloor = sectors[back->camsec].floorheight;
 		backceiling = sectors[back->camsec].ceilingheight;
+#ifdef ESLOPE
+		if (sectors[back->camsec].f_slope) // SRB2CBTODO: ESLOPE (sectors[front->heightsec].f_slope)
+			frontfloor = P_GetZAt(sectors[back->camsec].f_slope, camera.x, camera.y);
+		if (sectors[back->camsec].c_slope)
+			frontceiling = P_GetZAt(sectors[back->camsec].c_slope, camera.x, camera.y);
+#endif
 	}
 	else if (back->heightsec >= 0)
 	{
 		backfloor = sectors[back->heightsec].floorheight;
 		backceiling = sectors[back->heightsec].ceilingheight;
+#ifdef ESLOPE
+		if (sectors[back->heightsec].f_slope) // SRB2CBTODO: ESLOPE (sectors[front->heightsec].f_slope)
+			frontfloor = P_GetZAt(sectors[back->heightsec].f_slope, camera.x, camera.y);
+		if (sectors[back->heightsec].c_slope)
+			frontceiling = P_GetZAt(sectors[back->heightsec].c_slope, camera.x, camera.y);
+#endif
 	}
 	else
 	{
-		backfloor = back->floorheight;
+		backfloor = P_CameraGetFloorZ(mapcampointer, back, tmx, tmy, linedef);
-		backceiling = back->ceilingheight;
+		backceiling = P_CameraGetCeilingZ(mapcampointer, back, tmx, tmy, linedef);
 	}
 
 	{
@@ -417,17 +445,20 @@ void P_CameraLineOpening(line_t *linedef)
 					if (!(rover->flags & FF_BLOCKOTHERS) || !(rover->flags & FF_RENDERALL) || !(rover->flags & FF_EXISTS) || GETSECSPECIAL(rover->master->frontsector->special, 4) == 12)
 						continue;
 
-					delta1 = abs(mapcampointer->z - (*rover->bottomheight + ((*rover->topheight - *rover->bottomheight)/2)));
+					fixed_t topheight = P_CameraGetFOFTopZ(mapcampointer, front, rover, tmx, tmy, linedef);
-					delta2 = abs(thingtop - (*rover->bottomheight + ((*rover->topheight - *rover->bottomheight)/2)));
+					fixed_t bottomheight = P_CameraGetFOFBottomZ(mapcampointer, front, rover, tmx, tmy, linedef);
-					if (*rover->bottomheight < lowestceiling && delta1 >= delta2)
-						lowestceiling = *rover->bottomheight;
-					else if (*rover->bottomheight < highestceiling && delta1 >= delta2)
-						highestceiling = *rover->bottomheight;
 
-					if (*rover->topheight > highestfloor && delta1 < delta2)
+					delta1 = abs(mapcampointer->z - (bottomheight + ((topheight - bottomheight)/2)));
-						highestfloor = *rover->topheight;
+					delta2 = abs(thingtop - (bottomheight + ((topheight - bottomheight)/2)));
-					else if (*rover->topheight > lowestfloor && delta1 < delta2)
+					if (bottomheight < lowestceiling && delta1 >= delta2)
-						lowestfloor = *rover->topheight;
+						lowestceiling = bottomheight;
+					else if (bottomheight < highestceiling && delta1 >= delta2)
+						highestceiling = bottomheight;
+
+					if (topheight > highestfloor && delta1 < delta2)
+						highestfloor = topheight;
+					else if (topheight > lowestfloor && delta1 < delta2)
+						lowestfloor = topheight;
 				}
 
 			// Check for backsectors fake floors
@@ -437,17 +468,20 @@ void P_CameraLineOpening(line_t *linedef)
 					if (!(rover->flags & FF_BLOCKOTHERS) || !(rover->flags & FF_RENDERALL) || !(rover->flags & FF_EXISTS) || GETSECSPECIAL(rover->master->frontsector->special, 4) == 12)
 						continue;
 
-					delta1 = abs(mapcampointer->z - (*rover->bottomheight + ((*rover->topheight - *rover->bottomheight)/2)));
+					fixed_t topheight = P_CameraGetFOFTopZ(mapcampointer, back, rover, tmx, tmy, linedef);
-					delta2 = abs(thingtop - (*rover->bottomheight + ((*rover->topheight - *rover->bottomheight)/2)));
+					fixed_t bottomheight = P_CameraGetFOFBottomZ(mapcampointer, back, rover, tmx, tmy, linedef);
-					if (*rover->bottomheight < lowestceiling && delta1 >= delta2)
-						lowestceiling = *rover->bottomheight;
-					else if (*rover->bottomheight < highestceiling && delta1 >= delta2)
-						highestceiling = *rover->bottomheight;
 
-					if (*rover->topheight > highestfloor && delta1 < delta2)
+					delta1 = abs(mapcampointer->z - (bottomheight + ((topheight - bottomheight)/2)));
-						highestfloor = *rover->topheight;
+					delta2 = abs(thingtop - (bottomheight + ((topheight - bottomheight)/2)));
-					else if (*rover->topheight > lowestfloor && delta1 < delta2)
+					if (bottomheight < lowestceiling && delta1 >= delta2)
-						lowestfloor = *rover->topheight;
+						lowestceiling = bottomheight;
+					else if (bottomheight < highestceiling && delta1 >= delta2)
+						highestceiling = bottomheight;
+
+					if (topheight > highestfloor && delta1 < delta2)
+						highestfloor = topheight;
+					else if (topheight > lowestfloor && delta1 < delta2)
+						lowestfloor = topheight;
 				}
 
 			if (highestceiling < highceiling)
@@ -495,26 +529,40 @@ void P_LineOpening(line_t *linedef)
 	I_Assert(front != NULL);
 	I_Assert(back != NULL);
 
-	if (front->ceilingheight < back->ceilingheight)
+	{ // Set open and high/low values here
-	{
+		fixed_t frontheight, backheight;
-		opentop = front->ceilingheight;
-		highceiling = back->ceilingheight;
-	}
-	else
-	{
-		opentop = back->ceilingheight;
-		highceiling = front->ceilingheight;
-	}
 
-	if (front->floorheight > back->floorheight)
+		frontheight = P_GetCeilingZ(tmthing, front, tmx, tmy, linedef);
-	{
+		backheight = P_GetCeilingZ(tmthing, back, tmx, tmy, linedef);
-		openbottom = front->floorheight;
+
-		lowfloor = back->floorheight;
+		if (frontheight < backheight)
-	}
+		{
-	else
+			opentop = frontheight;
-	{
+			highceiling = backheight;
-		openbottom = back->floorheight;
+			opentopslope = front->c_slope;
-		lowfloor = front->floorheight;
+		}
+		else
+		{
+			opentop = backheight;
+			highceiling = frontheight;
+			opentopslope = back->c_slope;
+		}
+
+		frontheight = P_GetFloorZ(tmthing, front, tmx, tmy, linedef);
+		backheight = P_GetFloorZ(tmthing, back, tmx, tmy, linedef);
+
+		if (frontheight > backheight)
+		{
+			openbottom = frontheight;
+			lowfloor = backheight;
+			openbottomslope = front->f_slope;
+		}
+		else
+		{
+			openbottom = backheight;
+			lowfloor = frontheight;
+			openbottomslope = back->f_slope;
+		}
 	}
 
 	if (tmthing)
@@ -580,6 +628,10 @@ void P_LineOpening(line_t *linedef)
 			fixed_t highestfloor = openbottom;
 			fixed_t lowestfloor = lowfloor;
 			fixed_t delta1, delta2;
+#ifdef ESLOPE
+			pslope_t *ceilingslope = opentopslope;
+			pslope_t *floorslope = openbottomslope;
+#endif
 
 			// Check for frontsector's fake floors
 			for (rover = front->ffloors; rover; rover = rover->next)
@@ -593,23 +645,34 @@ void P_LineOpening(line_t *linedef)
 					|| (rover->flags & FF_BLOCKOTHERS && !tmthing->player)))
 					continue;
 
-				delta1 = abs(tmthing->z - (*rover->bottomheight + ((*rover->topheight - *rover->bottomheight)/2)));
+				fixed_t topheight = P_GetFOFTopZ(tmthing, front, rover, tmx, tmy, linedef);
-				delta2 = abs(thingtop - (*rover->bottomheight + ((*rover->topheight - *rover->bottomheight)/2)));
+				fixed_t bottomheight = P_GetFOFBottomZ(tmthing, front, rover, tmx, tmy, linedef);
+
+				delta1 = abs(tmthing->z - (bottomheight + ((topheight - bottomheight)/2)));
+				delta2 = abs(thingtop - (bottomheight + ((topheight - bottomheight)/2)));
 
 				if (delta1 >= delta2 && !(rover->flags & FF_PLATFORM)) // thing is below FOF
 				{
-					if (*rover->bottomheight < lowestceiling)
+					if (bottomheight < lowestceiling) {
-						lowestceiling = *rover->bottomheight;
+						lowestceiling = bottomheight;
-					else if (*rover->bottomheight < highestceiling)
+#ifdef ESLOPE
-						highestceiling = *rover->bottomheight;
+						ceilingslope = *rover->b_slope;
+#endif
+					}
+					else if (bottomheight < highestceiling)
+						highestceiling = bottomheight;
 				}
 
 				if (delta1 < delta2 && !(rover->flags & FF_REVERSEPLATFORM)) // thing is above FOF
 				{
-					if (*rover->topheight > highestfloor)
+					if (topheight > highestfloor) {
-						highestfloor = *rover->topheight;
+						highestfloor = topheight;
-					else if (*rover->topheight > lowestfloor)
+#ifdef ESLOPE
-						lowestfloor = *rover->topheight;
+						floorslope = *rover->t_slope;
+#endif
+					}
+					else if (topheight > lowestfloor)
+						lowestfloor = topheight;
 				}
 			}
 
@@ -625,23 +688,34 @@ void P_LineOpening(line_t *linedef)
 					|| (rover->flags & FF_BLOCKOTHERS && !tmthing->player)))
 					continue;
 
-				delta1 = abs(tmthing->z - (*rover->bottomheight + ((*rover->topheight - *rover->bottomheight)/2)));
+				fixed_t topheight = P_GetFOFTopZ(tmthing, back, rover, tmx, tmy, linedef);
-				delta2 = abs(thingtop - (*rover->bottomheight + ((*rover->topheight - *rover->bottomheight)/2)));
+				fixed_t bottomheight = P_GetFOFBottomZ(tmthing, back, rover, tmx, tmy, linedef);
+
+				delta1 = abs(tmthing->z - (bottomheight + ((topheight - bottomheight)/2)));
+				delta2 = abs(thingtop - (bottomheight + ((topheight - bottomheight)/2)));
 
 				if (delta1 >= delta2 && !(rover->flags & FF_PLATFORM)) // thing is below FOF
 				{
-					if (*rover->bottomheight < lowestceiling)
+					if (bottomheight < lowestceiling) {
-						lowestceiling = *rover->bottomheight;
+						lowestceiling = bottomheight;
-					else if (*rover->bottomheight < highestceiling)
+#ifdef ESLOPE
-						highestceiling = *rover->bottomheight;
+						ceilingslope = *rover->b_slope;
+#endif
+					}
+					else if (bottomheight < highestceiling)
+						highestceiling = bottomheight;
 				}
 
 				if (delta1 < delta2 && !(rover->flags & FF_REVERSEPLATFORM)) // thing is above FOF
 				{
-					if (*rover->topheight > highestfloor)
+					if (topheight > highestfloor) {
-						highestfloor = *rover->topheight;
+						highestfloor = topheight;
-					else if (*rover->topheight > lowestfloor)
+#ifdef ESLOPE
-						lowestfloor = *rover->topheight;
+						floorslope = *rover->t_slope;
+#endif
+					}
+					else if (topheight > lowestfloor)
+						lowestfloor = topheight;
 				}
 			}
 
@@ -653,13 +727,21 @@ void P_LineOpening(line_t *linedef)
 
 				delta1 = abs(tmthing->z - (polysec->floorheight + ((polysec->ceilingheight - polysec->floorheight)/2)));
 				delta2 = abs(thingtop - (polysec->floorheight + ((polysec->ceilingheight - polysec->floorheight)/2)));
-				if (polysec->floorheight < lowestceiling && delta1 >= delta2)
+				if (polysec->floorheight < lowestceiling && delta1 >= delta2) {
 					lowestceiling = polysec->floorheight;
+#ifdef ESLOPE
+					ceilingslope = NULL;
+#endif
+				}
 				else if (polysec->floorheight < highestceiling && delta1 >= delta2)
 					highestceiling = polysec->floorheight;
 
-				if (polysec->ceilingheight > highestfloor && delta1 < delta2)
+				if (polysec->ceilingheight > highestfloor && delta1 < delta2) {
 					highestfloor = polysec->ceilingheight;
+#ifdef ESLOPE
+					floorslope = NULL;
+#endif
+				}
 				else if (polysec->ceilingheight > lowestfloor && delta1 < delta2)
 					lowestfloor = polysec->ceilingheight;
 			}
@@ -667,11 +749,19 @@ void P_LineOpening(line_t *linedef)
 			if (highestceiling < highceiling)
 				highceiling = highestceiling;
 
-			if (highestfloor > openbottom)
+			if (highestfloor > openbottom) {
 				openbottom = highestfloor;
+#ifdef ESLOPE
+				openbottomslope = floorslope;
+#endif
+			}
 
-			if (lowestceiling < opentop)
+			if (lowestceiling < opentop) {
 				opentop = lowestceiling;
+#ifdef ESLOPE
+				opentopslope = ceilingslope;
+#endif
+			}
 
 			if (lowestfloor > lowfloor)
 				lowfloor = lowestfloor;
@@ -769,6 +859,7 @@ void P_SetThingPosition(mobj_t *thing)
 {                                                      // link into subsector
 	subsector_t *ss;
 	sector_t *oldsec = NULL;
+	fixed_t tfloorz, tceilz;
 
 	I_Assert(thing != NULL);
 	I_Assert(!P_MobjWasRemoved(thing));
@@ -838,12 +929,15 @@ void P_SetThingPosition(mobj_t *thing)
 	// sector's floor is the same height.
 	if (thing->player && oldsec != NULL && thing->subsector && oldsec != thing->subsector->sector)
 	{
+		tfloorz = P_GetFloorZ(thing, ss->sector, thing->x, thing->y, NULL);
+		tceilz = P_GetCeilingZ(thing, ss->sector, thing->x, thing->y, NULL);
+
 		if (thing->eflags & MFE_VERTICALFLIP)
 		{
-			if (thing->z + thing->height >= thing->subsector->sector->ceilingheight)
+			if (thing->z + thing->height >= tceilz)
 				thing->eflags |= MFE_JUSTSTEPPEDDOWN;
 		}
-		else if (thing->z <= thing->subsector->sector->floorheight)
+		else if (thing->z <= tfloorz)
 			thing->eflags |= MFE_JUSTSTEPPEDDOWN;
 	}
 }

src/p_maputl.h

@@ -55,6 +55,9 @@ void P_CreatePrecipSecNodeList(precipmobj_t *thing, fixed_t x,fixed_t y);
 boolean P_SceneryTryMove(mobj_t *thing, fixed_t x, fixed_t y);
 
 extern fixed_t opentop, openbottom, openrange, lowfloor, highceiling;
+#ifdef ESLOPE
+extern pslope_t *opentopslope, *openbottomslope;
+#endif
 
 void P_LineOpening(line_t *plinedef);
 

src/p_mobj.h

@@ -354,6 +354,10 @@ typedef struct mobj_s
 	INT32 cusval;
 	INT32 cvmem;
 
+#ifdef ESLOPE
+	struct pslope_s *standingslope; // The slope that the object is standing on (shouldn't need synced in savegames, right?)
+#endif
+
 	// WARNING: New fields must be added separately to savegame and Lua.
 } mobj_t;
 

src/p_saveg.c

@@ -30,6 +30,9 @@
 #include "r_sky.h"
 #include "p_polyobj.h"
 #include "lua_script.h"
+#ifdef ESLOPE
+#include "p_slopes.h"
+#endif
 
 savedata_t savedata;
 UINT8 *save_p;
@@ -921,7 +924,8 @@ typedef enum
 	MD2_EXTVAL1     = 1<<5,
 	MD2_EXTVAL2     = 1<<6,
 	MD2_HNEXT       = 1<<7,
-	MD2_HPREV       = 1<<8
+	MD2_HPREV       = 1<<8,
+	MD2_SLOPE       = 1<<9
 } mobj_diff2_t;
 
 typedef enum
@@ -1109,6 +1113,8 @@ static void SaveMobjThinker(const thinker_t *th, const UINT8 type)
 		diff2 |= MD2_HNEXT;
 	if (mobj->hprev)
 		diff2 |= MD2_HPREV;
+	if (mobj->standingslope)
+		diff2 |= MD2_SLOPE;
 	if (diff2 != 0)
 		diff |= MD_MORE;
 
@@ -1221,6 +1227,8 @@ static void SaveMobjThinker(const thinker_t *th, const UINT8 type)
 		WRITEUINT32(save_p, mobj->hnext->mobjnum);
 	if (diff2 & MD2_HPREV)
 		WRITEUINT32(save_p, mobj->hprev->mobjnum);
+	if (diff2 & MD2_SLOPE)
+		WRITEUINT16(save_p, mobj->standingslope->id);
 
 	WRITEUINT32(save_p, mobj->mobjnum);
 }
@@ -2068,6 +2076,9 @@ static void LoadMobjThinker(actionf_p1 thinker)
 		mobj->hnext = (mobj_t *)(size_t)READUINT32(save_p);
 	if (diff2 & MD2_HPREV)
 		mobj->hprev = (mobj_t *)(size_t)READUINT32(save_p);
+	if (diff2 & MD2_SLOPE)
+		mobj->standingslope = P_SlopeById(READUINT16(save_p));
+
 
 	if (diff & MD_REDFLAG)
 	{

src/p_setup.c

@@ -72,6 +72,10 @@
 #include "hardware/hw_light.h"
 #endif
 
+#ifdef ESLOPE
+#include "p_slopes.h"
+#endif
+
 //
 // Map MD5, calculated on level load.
 // Sent to clients in PT_SERVERINFO.
@@ -846,7 +850,7 @@ void P_ScanThings(INT16 mapnum, INT16 wadnum, INT16 lumpnum)
 //
 // P_LoadThings
 //
-static void P_LoadThings(lumpnum_t lumpnum)
+static void P_PrepareThings(lumpnum_t lumpnum)
 {
 	size_t i;
 	mapthing_t *mt;
@@ -884,13 +888,27 @@ static void P_LoadThings(lumpnum_t lumpnum)
 	}
 	Z_Free(datastart);
 
+}
+
+static void P_LoadThings(void)
+{
+	size_t i;
+	mapthing_t *mt;
+
+	// Loading the things lump itself into memory is now handled in P_PrepareThings, above
+
 	mt = mapthings;
 	numhuntemeralds = 0;
 	for (i = 0; i < nummapthings; i++, mt++)
 	{
+		sector_t *mtsector = R_PointInSubsector(mt->x << FRACBITS, mt->y << FRACBITS)->sector;
+
 		// Z for objects
-		mt->z = (INT16)(R_PointInSubsector(mt->x << FRACBITS, mt->y << FRACBITS)
+		mt->z = (INT16)(
-			->sector->floorheight>>FRACBITS);
+#ifdef ESLOPE
+				mtsector->f_slope ? P_GetZAt(mtsector->f_slope, mt->x << FRACBITS, mt->y << FRACBITS) :
+#endif
+				mtsector->floorheight)>>FRACBITS;
 
 		if (mt->type == 1700 // MT_AXIS
 			|| mt->type == 1701 // MT_AXISTRANSFER
@@ -2114,7 +2132,8 @@ void P_LoadThingsOnly(void)
 
 	P_LevelInitStuff();
 
-	P_LoadThings(lastloadedmaplumpnum + ML_THINGS);
+	P_PrepareThings(lastloadedmaplumpnum + ML_THINGS);
+	P_LoadThings();
 
 	P_SpawnSecretItems(true);
 }
@@ -2531,7 +2550,13 @@ boolean P_SetupLevel(boolean skipprecip)
 
 	P_MapStart();
 
-	P_LoadThings(lastloadedmaplumpnum + ML_THINGS);
+	P_PrepareThings(lastloadedmaplumpnum + ML_THINGS);
+
+#ifdef ESLOPE
+	P_ResetDynamicSlopes();
+#endif
+
+	P_LoadThings();
 
 	P_SpawnSecretItems(loademblems);
 

src/p_slopes.h

@@ -0,0 +1,80 @@
+// Emacs style mode select   -*- C++ -*-
+//-----------------------------------------------------------------------------
+//
+// Copyright(C) 2004 Stephen McGranahan
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//
+//--------------------------------------------------------------------------
+//
+// DESCRIPTION:
+//      Slopes
+//      SoM created 05/10/09
+//
+//-----------------------------------------------------------------------------
+
+#ifndef P_SLOPES_H__
+#define P_SLOPES_H__
+
+#ifdef ESLOPE
+void P_ResetDynamicSlopes(void);
+void P_RunDynamicSlopes(void);
+// P_SpawnSlope_Line
+// Creates one or more slopes based on the given line type and front/back
+// sectors.
+void P_SpawnSlope_Line(int linenum);
+
+#ifdef SPRINGCLEAN
+// Loads just map objects that make slopes,
+// terrain affecting objects have to be spawned first
+void P_SetSlopesFromVertexHeights(lumpnum_t lumpnum);
+
+typedef enum
+{
+	THING_SlopeFloorPointLine = 9500,
+	THING_SlopeCeilingPointLine = 9501,
+	THING_SetFloorSlope = 9502,
+	THING_SetCeilingSlope = 9503,
+	THING_CopyFloorPlane = 9510,
+	THING_CopyCeilingPlane = 9511,
+	THING_VavoomFloor=1500,
+	THING_VavoomCeiling=1501,
+	THING_VertexFloorZ=1504,
+	THING_VertexCeilingZ=1505,
+} slopething_e;
+#endif
+
+//
+// P_CopySectorSlope
+//
+// Searches through tagged sectors and copies
+//
+void P_CopySectorSlope(line_t *line);
+
+pslope_t *P_SlopeById(UINT16 id);
+
+// Returns the height of the sloped plane at (x, y) as a fixed_t
+fixed_t P_GetZAt(pslope_t *slope, fixed_t x, fixed_t y);
+
+// Lots of physics-based bullshit
+void P_QuantizeMomentumToSlope(vector3_t *momentum, pslope_t *slope);
+void P_SlopeLaunch(mobj_t *mo);
+void P_HandleSlopeLanding(mobj_t *thing, pslope_t *slope);
+void P_ButteredSlope(mobj_t *mo);
+
+#endif
+
+// EOF
+#endif // #ifdef ESLOPE

src/p_spec.c

@@ -3365,6 +3365,7 @@ sector_t *P_PlayerTouchingSectorSpecial(player_t *player, INT32 section, INT32 n
 static boolean P_ThingIsOnThe3DFloor(mobj_t *mo, sector_t *sector, sector_t *targetsec)
 {
 	ffloor_t *rover;
+	fixed_t top, bottom;
 
 	if (!mo->player) // should NEVER happen
 		return false;
@@ -3381,6 +3382,9 @@ static boolean P_ThingIsOnThe3DFloor(mobj_t *mo, sector_t *sector, sector_t *tar
 		//if (!(rover->flags & FF_EXISTS))
 		//	return false;
 
+		top = P_GetSpecialTopZ(mo, sector, targetsec);
+		bottom = P_GetSpecialBottomZ(mo, sector, targetsec);
+
 		// Check the 3D floor's type...
 		if (rover->flags & FF_BLOCKPLAYER)
 		{
@@ -3388,27 +3392,27 @@ static boolean P_ThingIsOnThe3DFloor(mobj_t *mo, sector_t *sector, sector_t *tar
 			if ((rover->master->frontsector->flags & SF_FLIPSPECIAL_FLOOR)
 				&& !(rover->master->frontsector->flags & SF_FLIPSPECIAL_CEILING))
 			{
-				if ((mo->eflags & MFE_VERTICALFLIP) || mo->z != *rover->topheight)
+				if ((mo->eflags & MFE_VERTICALFLIP) || mo->z != top)
 					return false;
 			}
 			else if ((rover->master->frontsector->flags & SF_FLIPSPECIAL_CEILING)
 				&& !(rover->master->frontsector->flags & SF_FLIPSPECIAL_FLOOR))
 			{
 				if (!(mo->eflags & MFE_VERTICALFLIP)
-					|| mo->z + mo->height != *rover->bottomheight)
+					|| mo->z + mo->height != bottom)
 					return false;
 			}
 			else if (rover->master->frontsector->flags & SF_FLIPSPECIAL_BOTH)
 			{
-				if (!((mo->eflags & MFE_VERTICALFLIP && mo->z + mo->height == *rover->bottomheight)
+				if (!((mo->eflags & MFE_VERTICALFLIP && mo->z + mo->height == bottom)
-					|| (!(mo->eflags & MFE_VERTICALFLIP) && mo->z == *rover->topheight)))
+					|| (!(mo->eflags & MFE_VERTICALFLIP) && mo->z == top)))
 					return false;
 			}
 		}
 		else
 		{
 			// Water and intangible FOFs
-			if (mo->z > *rover->topheight || (mo->z + mo->height) < *rover->bottomheight)
+			if (mo->z > top || (mo->z + mo->height) < bottom)
 				return false;
 		}
 
@@ -3426,9 +3430,9 @@ static boolean P_ThingIsOnThe3DFloor(mobj_t *mo, sector_t *sector, sector_t *tar
 static inline boolean P_MobjReadyToTrigger(mobj_t *mo, sector_t *sec)
 {
 	if (mo->eflags & MFE_VERTICALFLIP)
-		return (mo->z+mo->height == sec->ceilingheight && sec->flags & SF_FLIPSPECIAL_CEILING);
+		return (mo->z+mo->height == P_GetSpecialTopZ(mo, sec, sec) && sec->flags & SF_FLIPSPECIAL_CEILING);
 	else
-		return (mo->z == sec->floorheight && sec->flags & SF_FLIPSPECIAL_FLOOR);
+		return (mo->z == P_GetSpecialBottomZ(mo, sec, sec) && sec->flags & SF_FLIPSPECIAL_FLOOR);
 }
 
 /** Applies a sector special to a player.
@@ -4389,27 +4393,27 @@ static void P_PlayerOnSpecial3DFloor(player_t *player, sector_t *sector)
 			if ((rover->master->frontsector->flags & SF_FLIPSPECIAL_FLOOR)
 				&& !(rover->master->frontsector->flags & SF_FLIPSPECIAL_CEILING))
 			{
-				if ((player->mo->eflags & MFE_VERTICALFLIP) || player->mo->z != *rover->topheight)
+				if ((player->mo->eflags & MFE_VERTICALFLIP) || player->mo->z != P_GetSpecialTopZ(player->mo, sectors + rover->secnum, sector))
 					continue;
 			}
 			else if ((rover->master->frontsector->flags & SF_FLIPSPECIAL_CEILING)
 				&& !(rover->master->frontsector->flags & SF_FLIPSPECIAL_FLOOR))
 			{
 				if (!(player->mo->eflags & MFE_VERTICALFLIP)
-					|| player->mo->z + player->mo->height != *rover->bottomheight)
+					|| player->mo->z + player->mo->height != P_GetSpecialBottomZ(player->mo, sectors + rover->secnum, sector))
 					continue;
 			}
 			else if (rover->master->frontsector->flags & SF_FLIPSPECIAL_BOTH)
 			{
-				if (!((player->mo->eflags & MFE_VERTICALFLIP && player->mo->z + player->mo->height == *rover->bottomheight)
+				if (!((player->mo->eflags & MFE_VERTICALFLIP && player->mo->z + player->mo->height == P_GetSpecialBottomZ(player->mo, sectors + rover->secnum, sector))
-					|| (!(player->mo->eflags & MFE_VERTICALFLIP) && player->mo->z == *rover->topheight)))
+					|| (!(player->mo->eflags & MFE_VERTICALFLIP) && player->mo->z == P_GetSpecialTopZ(player->mo, sectors + rover->secnum, sector))))
 					continue;
 			}
 		}
 		else
 		{
 			// Water and DEATH FOG!!! heh
-			if (player->mo->z > *rover->topheight || (player->mo->z + player->mo->height) < *rover->bottomheight)
+			if (player->mo->z > P_GetSpecialTopZ(player->mo, sectors + rover->secnum, sector) || (player->mo->z + player->mo->height) < P_GetSpecialBottomZ(player->mo, sectors + rover->secnum, sector))
 				continue;
 		}
 
@@ -4519,6 +4523,7 @@ static void P_PlayerOnSpecial3DFloor(player_t *player, sector_t *sector)
 static void P_RunSpecialSectorCheck(player_t *player, sector_t *sector)
 {
 	boolean nofloorneeded = false;
+	fixed_t f_affectpoint, c_affectpoint;
 
 	if (!sector->special) // nothing special, exit
 		return;
@@ -4581,16 +4586,19 @@ static void P_RunSpecialSectorCheck(player_t *player, sector_t *sector)
 		return;
 	}
 
+	f_affectpoint = P_GetSpecialBottomZ(player->mo, sector, sector);
+	c_affectpoint = P_GetSpecialTopZ(player->mo, sector, sector);
+
 	// Only go further if on the ground
-	if ((sector->flags & SF_FLIPSPECIAL_FLOOR) && !(sector->flags & SF_FLIPSPECIAL_CEILING) && player->mo->z != sector->floorheight)
+	if ((sector->flags & SF_FLIPSPECIAL_FLOOR) && !(sector->flags & SF_FLIPSPECIAL_CEILING) && player->mo->z != f_affectpoint)
 		return;
 
-	if ((sector->flags & SF_FLIPSPECIAL_CEILING) && !(sector->flags & SF_FLIPSPECIAL_FLOOR) && player->mo->z + player->mo->height != sector->ceilingheight)
+	if ((sector->flags & SF_FLIPSPECIAL_CEILING) && !(sector->flags & SF_FLIPSPECIAL_FLOOR) && player->mo->z + player->mo->height != c_affectpoint)
 		return;
 
 	if ((sector->flags & SF_FLIPSPECIAL_BOTH)
-		&& player->mo->z != sector->floorheight
+		&& player->mo->z != f_affectpoint
-		&& player->mo->z + player->mo->height != sector->ceilingheight)
+		&& player->mo->z + player->mo->height != c_affectpoint)
 		return;
 
 	P_ProcessSpecialSector(player, sector, NULL);
@@ -4751,6 +4759,9 @@ void P_UpdateSpecials(void)
 	// POINT LIMIT
 	P_CheckPointLimit();
 
+	// Dynamic slopeness
+	P_RunDynamicSlopes();
+
 	// ANIMATE TEXTURES
 	for (anim = anims; anim < lastanim; anim++)
 	{
@@ -4894,6 +4905,12 @@ static ffloor_t *P_AddFakeFloor(sector_t *sec, sector_t *sec2, line_t *master, f
 	ffloor->topyoffs = &sec2->ceiling_yoffs;
 	ffloor->topangle = &sec2->ceilingpic_angle;
 
+#ifdef ESLOPE
+	// Add slopes
+	ffloor->t_slope = &sec2->c_slope;
+	ffloor->b_slope = &sec2->f_slope;
+#endif
+
 	if ((flags & FF_SOLID) && (master->flags & ML_EFFECT1)) // Block player only
 		flags &= ~FF_BLOCKOTHERS;
 
@@ -5327,6 +5344,7 @@ void T_LaserFlash(laserthink_t *flash)
 	sector_t *sourcesec;
 	ffloor_t *ffloor = flash->ffloor;
 	sector_t *sector = flash->sector;
+	fixed_t top, bottom;
 
 	if (!ffloor || !(ffloor->flags & FF_EXISTS))
 		return;
@@ -5350,8 +5368,11 @@ void T_LaserFlash(laserthink_t *flash)
 			&& thing->flags & MF_BOSS)
 			continue; // Don't hurt bosses
 
-		if (thing->z >= sourcesec->ceilingheight
+		top = P_GetSpecialTopZ(thing, sourcesec, sector);
-		|| thing->z + thing->height <= sourcesec->floorheight)
+		bottom = P_GetSpecialBottomZ(thing, sourcesec, sector);
+
+		if (thing->z >= top
+		|| thing->z + thing->height <= bottom)
 			continue;
 
 		if (thing->flags & MF_SHOOTABLE)
@@ -6430,6 +6451,14 @@ void P_SpawnSpecials(INT32 fromnetsave)
 					sectors[s].midmap = lines[i].frontsector->midmap;
 				break;
 
+#ifdef ESLOPE // Slope copy specials. Handled here for sanity.
+			case 720:
+			case 721:
+			case 722:
+				P_CopySectorSlope(&lines[i]);
+				break;
+#endif
+
 			default:
 				break;
 		}
@@ -6634,6 +6663,8 @@ void T_Scroll(scroll_t *s)
 						if (thing->eflags & MFE_PUSHED) // Already pushed this tic by an exclusive pusher.
 							continue;
 
+						height = P_GetSpecialBottomZ(thing, sec, psec);
+
 						if (!(thing->flags & MF_NOCLIP)) // Thing must be clipped
 						if (!(thing->flags & MF_NOGRAVITY || thing->z+thing->height != height)) // Thing must a) be non-floating and have z+height == height
 						{
@@ -6654,6 +6685,8 @@ void T_Scroll(scroll_t *s)
 					if (thing->eflags & MFE_PUSHED)
 						continue;
 
+					height = P_GetSpecialBottomZ(thing, sec, sec);
+
 					if (!(thing->flags & MF_NOCLIP) &&
 						(!(thing->flags & MF_NOGRAVITY || thing->z > height)))
 					{
@@ -6693,6 +6726,8 @@ void T_Scroll(scroll_t *s)
 						if (thing->eflags & MFE_PUSHED)
 							continue;
 
+						height = P_GetSpecialTopZ(thing, sec, psec);
+
 						if (!(thing->flags & MF_NOCLIP)) // Thing must be clipped
 						if (!(thing->flags & MF_NOGRAVITY || thing->z != height))// Thing must a) be non-floating and have z == height
 						{
@@ -6713,6 +6748,8 @@ void T_Scroll(scroll_t *s)
 					if (thing->eflags & MFE_PUSHED)
 						continue;
 
+					height = P_GetSpecialTopZ(thing, sec, sec);
+
 					if (!(thing->flags & MF_NOCLIP) &&
 						(!(thing->flags & MF_NOGRAVITY || thing->z+thing->height < height)))
 					{
@@ -7006,7 +7043,7 @@ static void Add_Friction(INT32 friction, INT32 movefactor, INT32 affectee, INT32
   */
 void T_Friction(friction_t *f)
 {
-	sector_t *sec;
+	sector_t *sec, *referrer;
 	mobj_t *thing;
 	msecnode_t *node;
 
@@ -7015,7 +7052,7 @@ void T_Friction(friction_t *f)
 	// Make sure the sector type hasn't changed
 	if (f->roverfriction)
 	{
-		sector_t *referrer = sectors + f->referrer;
+		referrer = sectors + f->referrer;
 
 		if (!(GETSECSPECIAL(referrer->special, 3) == 1
 			|| GETSECSPECIAL(referrer->special, 3) == 3))
@@ -7047,9 +7084,7 @@ void T_Friction(friction_t *f)
 		{
 			if (f->roverfriction)
 			{
-				sector_t *referrer = &sectors[f->referrer];
+				if (thing->floorz != P_GetSpecialTopZ(thing, referrer, sec))
-
-				if (thing->floorz != referrer->ceilingheight)
 				{
 					node = node->m_snext;
 					continue;
@@ -7062,7 +7097,7 @@ void T_Friction(friction_t *f)
 					thing->movefactor = f->movefactor;
 				}
 			}
-			else if (sec->floorheight == thing->floorz && (thing->friction == ORIG_FRICTION // normal friction?
+			else if (P_GetSpecialBottomZ(thing, sec, sec) == thing->floorz && (thing->friction == ORIG_FRICTION // normal friction?
 				|| f->friction < thing->friction))
 			{
 				thing->friction = f->friction;
@@ -7336,7 +7371,7 @@ static inline boolean PIT_PushThing(mobj_t *thing)
   */
 void T_Pusher(pusher_t *p)
 {
-	sector_t *sec;
+	sector_t *sec, *referrer;
 	mobj_t *thing;
 	msecnode_t *node;
 	INT32 xspeed = 0,yspeed = 0;
@@ -7345,7 +7380,6 @@ void T_Pusher(pusher_t *p)
 	//INT32 ht = 0;
 	boolean inFOF;
 	boolean touching;
-	boolean foundfloor = false;
 	boolean moved;
 
 	xspeed = yspeed = 0;
@@ -7357,19 +7391,16 @@ void T_Pusher(pusher_t *p)
 
 	if (p->roverpusher)
 	{
-		sector_t *referrer = &sectors[p->referrer];
+		referrer = &sectors[p->referrer];
 
-		if (GETSECSPECIAL(referrer->special, 3) == 2
+		if (!(GETSECSPECIAL(referrer->special, 3) == 2
-			|| GETSECSPECIAL(referrer->special, 3) == 3)
+			|| GETSECSPECIAL(referrer->special, 3) == 3))
-			foundfloor = true;
+			return;
 	}
 	else if (!(GETSECSPECIAL(sec->special, 3) == 2
 			|| GETSECSPECIAL(sec->special, 3) == 3))
 		return;
 
-	if (p->roverpusher && foundfloor == false) // Not even a 3d floor has the PUSH_MASK.
-		return;
-
 	// For constant pushers (wind/current) there are 3 situations:
 	//
 	// 1) Affected Thing is above the floor.
@@ -7444,41 +7475,38 @@ void T_Pusher(pusher_t *p)
 		// Find the area that the 'thing' is in
 		if (p->roverpusher)
 		{
-			sector_t *referrer = &sectors[p->referrer];
+			fixed_t top, bottom;
-			INT32 special;
 
-			special = GETSECSPECIAL(referrer->special, 3);
+			top = P_GetSpecialTopZ(thing, referrer, sec);
-
+			bottom = P_GetSpecialBottomZ(thing, referrer, sec);
-			if (!(special == 2 || special == 3))
-				return;
 
 			if (thing->eflags & MFE_VERTICALFLIP)
 			{
-				if (referrer->floorheight > thing->z + thing->height
+				if (bottom > thing->z + thing->height
-					|| referrer->ceilingheight < (thing->z + (thing->height >> 1)))
+					|| top < (thing->z + (thing->height >> 1)))
 					continue;
 
-				if (thing->z < referrer->floorheight)
+				if (thing->z < bottom)
 					touching = true;
 
-				if (thing->z + (thing->height >> 1) > referrer->floorheight)
+				if (thing->z + (thing->height >> 1) > bottom)
 					inFOF = true;
 
 			}
 			else
 			{
-				if (referrer->ceilingheight < thing->z || referrer->floorheight > (thing->z + (thing->height >> 1)))
+				if (top < thing->z || referrer->floorheight > (thing->z + (thing->height >> 1)))
 					continue;
-				if (thing->z + thing->height > referrer->ceilingheight)
+				if (thing->z + thing->height > top)
 					touching = true;
 
-				if (thing->z + (thing->height >> 1) < referrer->ceilingheight)
+				if (thing->z + (thing->height >> 1) < top)
 					inFOF = true;
 			}
 		}
 		else // Treat the entire sector as one big FOF
 		{
-			if (thing->z == thing->subsector->sector->floorheight)
+			if (thing->z == P_GetSpecialBottomZ(thing, sec, sec))
 				touching = true;
 			else if (p->type != p_current)
 				inFOF = true;

src/p_user.c

@@ -1212,7 +1212,7 @@ boolean P_IsObjectOnGroundIn(mobj_t *mo, sector_t *sec)
 	if (mo->eflags & MFE_VERTICALFLIP)
 	{
 		// Detect if the player is on the ceiling.
-		if (mo->z+mo->height >= sec->ceilingheight)
+		if (mo->z+mo->height >= P_GetSpecialTopZ(mo, sec, sec))
 			return true;
 		// Otherwise, detect if the player is on the bottom of a FOF.
 		else
@@ -1236,7 +1236,7 @@ boolean P_IsObjectOnGroundIn(mobj_t *mo, sector_t *sec)
 					continue;
 
 				// Actually check if the player is on the suitable FOF.
-				if (mo->z+mo->height == *rover->bottomheight)
+				if (mo->z+mo->height == P_GetSpecialBottomZ(mo, sectors + rover->secnum, sec))
 					return true;
 			}
 		}
@@ -1245,7 +1245,7 @@ boolean P_IsObjectOnGroundIn(mobj_t *mo, sector_t *sec)
 	else
 	{
 		// Detect if the player is on the floor.
-		if (mo->z <= sec->floorheight)
+		if (mo->z <= P_GetSpecialBottomZ(mo, sec, sec))
 			return true;
 		// Otherwise, detect if the player is on the top of a FOF.
 		else
@@ -1269,7 +1269,7 @@ boolean P_IsObjectOnGroundIn(mobj_t *mo, sector_t *sec)
 					continue;
 
 				// Actually check if the player is on the suitable FOF.
-				if (mo->z == *rover->topheight)
+				if (mo->z == P_GetSpecialTopZ(mo, sectors + rover->secnum, sec))
 					return true;
 			}
 		}
@@ -1789,6 +1789,9 @@ static void P_CheckBouncySectors(player_t *player)
 	fixed_t oldx;
 	fixed_t oldy;
 	fixed_t oldz;
+#ifdef ESLOPE
+	vector3_t momentum;
+#endif
 
 	oldx = player->mo->x;
 	oldy = player->mo->y;
@@ -1809,16 +1812,21 @@ static void P_CheckBouncySectors(player_t *player)
 		{
 			ffloor_t *rover;
 			boolean top = true;
+			fixed_t topheight, bottomheight;
 
 			for (rover = node->m_sector->ffloors; rover; rover = rover->next)
 			{
-				if (player->mo->z > *rover->topheight)
+				topheight = P_GetFOFTopZ(player->mo, node->m_sector, rover, player->mo->x, player->mo->y, NULL);
+				bottomheight = P_GetFOFBottomZ(player->mo, node->m_sector, rover, player->mo->x, player->mo->y, NULL);
+
+				if (player->mo->z > topheight)
 					continue;
 
-				if (player->mo->z + player->mo->height < *rover->bottomheight)
+				if (player->mo->z + player->mo->height < bottomheight)
 					continue;
 
-				if (oldz < *rover->topheight && oldz > *rover->bottomheight)
+				if (oldz < P_GetFOFTopZ(player->mo, node->m_sector, rover, oldx, oldy, NULL)
+						&& oldz + player->mo->height > P_GetFOFBottomZ(player->mo, node->m_sector, rover, oldx, oldy, NULL))
 					top = false;
 
 				if (GETSECSPECIAL(rover->master->frontsector->special, 1) == 15)
@@ -1833,7 +1841,29 @@ static void P_CheckBouncySectors(player_t *player)
 					{
 						fixed_t newmom;
 
+#ifdef ESLOPE
+						pslope_t *slope;
+						if (abs(oldz - topheight) < abs(oldz + player->mo->height - bottomheight)) { // Hit top
+							slope = *rover->t_slope;
+						} else { // Hit bottom
+							slope = *rover->b_slope;
+						}
+
+						momentum.x = player->mo->momx;
+						momentum.y = player->mo->momy;
+						momentum.z = player->mo->momz*2;
+
+						if (slope) {
+							// Reverse quantizing might could use its own function later
+							slope->zangle = ANGLE_MAX-slope->zangle;
+							P_QuantizeMomentumToSlope(&momentum, slope);
+							slope->zangle = ANGLE_MAX-slope->zangle;
+						}
+
+						newmom = momentum.z = -FixedMul(momentum.z,linedist)/2;
+#else
 						newmom = -FixedMul(player->mo->momz,linedist);
+#endif
 
 						if (abs(newmom) < (linedist*2))
 						{
@@ -1856,7 +1886,18 @@ static void P_CheckBouncySectors(player_t *player)
 						else if (newmom < -P_GetPlayerHeight(player)/2)
 							newmom = -P_GetPlayerHeight(player)/2;
 
+#ifdef ESLOPE
+						momentum.z = newmom*2;
+
+						if (slope)
+							P_QuantizeMomentumToSlope(&momentum, slope);
+
+						player->mo->momx = momentum.x;
+						player->mo->momy = momentum.y;
+						player->mo->momz = momentum.z/2;
+#else
 						player->mo->momz = newmom;
+#endif
 
 						if (player->pflags & PF_SPINNING)
 						{
@@ -2280,10 +2321,23 @@ static void P_DoClimbing(player_t *player)
 		floorclimb = false;
 		boostup = false;
 		skyclimber = false;
+		fixed_t floorheight, ceilingheight; // ESLOPE
+
+#ifdef ESLOPE
+		floorheight = glidesector->sector->f_slope ? P_GetZAt(glidesector->sector->f_slope, player->mo->x, player->mo->y)
+		                                           : glidesector->sector->floorheight;
+		ceilingheight = glidesector->sector->c_slope ? P_GetZAt(glidesector->sector->c_slope, player->mo->x, player->mo->y)
+		                                             : glidesector->sector->ceilingheight;
+#else
+		floorheight = glidesector->sector->floorheight;
+		ceilingheight = glidesector->sector->ceilingheight;
+#endif
 
 		if (glidesector->sector->ffloors)
 		{
 			ffloor_t *rover;
+			fixed_t topheight, bottomheight; // ESLOPE
+
 			for (rover = glidesector->sector->ffloors; rover; rover = rover->next)
 			{
 				if (!(rover->flags & FF_EXISTS) || !(rover->flags & FF_BLOCKPLAYER) || (rover->flags & FF_BUSTUP))
@@ -2291,13 +2345,21 @@ static void P_DoClimbing(player_t *player)
 
 				floorclimb = true;
 
+#ifdef ESLOPE
+				bottomheight = *rover->b_slope ? P_GetZAt(*rover->b_slope, player->mo->x, player->mo->y) : *rover->bottomheight;
+				topheight = *rover->t_slope ? P_GetZAt(*rover->t_slope, player->mo->x, player->mo->y) : *rover->topheight;
+#else
+				bottomheight = *rover->bottomheight;
+				topheight = *rover->topheight;
+#endif
+
 				// Only supports rovers that are moving like an 'elevator', not just the top or bottom.
 				if (rover->master->frontsector->floorspeed && rover->master->frontsector->ceilspeed == 42)
 				{
-					if ((!(player->mo->eflags & MFE_VERTICALFLIP) && (*rover->bottomheight < player->mo->z+player->mo->height)
+					if ((!(player->mo->eflags & MFE_VERTICALFLIP) && (bottomheight < player->mo->z+player->mo->height)
-						&& (*rover->topheight >= player->mo->z + FixedMul(16*FRACUNIT, player->mo->scale)))
+						&& (topheight >= player->mo->z + FixedMul(16*FRACUNIT, player->mo->scale)))
-					|| ((player->mo->eflags & MFE_VERTICALFLIP) && (*rover->topheight > player->mo->z)
+					|| ((player->mo->eflags & MFE_VERTICALFLIP) && (topheight > player->mo->z)
-						&& (*rover->bottomheight <= player->mo->z + player->mo->height - FixedMul(16*FRACUNIT, player->mo->scale))))
+						&& (bottomheight <= player->mo->z + player->mo->height - FixedMul(16*FRACUNIT, player->mo->scale))))
 					{
 						if (cmd->forwardmove != 0)
 							player->mo->momz += rover->master->frontsector->floorspeed;
@@ -2313,8 +2375,9 @@ static void P_DoClimbing(player_t *player)
 				if (player->mo->eflags & MFE_VERTICALFLIP)
 				{
 					// Trying to climb down past the bottom of the FOF
-					if ((*rover->topheight >= player->mo->z + player->mo->height) && ((player->mo->z + player->mo->height + player->mo->momz) >= *rover->topheight))
+					if ((topheight >= player->mo->z + player->mo->height) && ((player->mo->z + player->mo->height + player->mo->momz) >= topheight))
 					{
+						fixed_t bottomheight2;
 						ffloor_t *roverbelow;
 						boolean foundfof = false;
 						floorclimb = true;
@@ -2329,7 +2392,13 @@ static void P_DoClimbing(player_t *player)
 							if (roverbelow == rover)
 								continue;
 
-							if (*roverbelow->bottomheight < *rover->topheight + FixedMul(16*FRACUNIT, player->mo->scale))
+#ifdef ESLOPE
+							bottomheight2 = *roverbelow->b_slope ? P_GetZAt(*roverbelow->b_slope, player->mo->x, player->mo->y) : *roverbelow->bottomheight;
+#else
+							bottomheight2 = *roverbelow->bottomheight;
+#endif
+
+							if (bottomheight2 < topheight + FixedMul(16*FRACUNIT, player->mo->scale))
 								foundfof = true;
 						}
 
@@ -2338,7 +2407,7 @@ static void P_DoClimbing(player_t *player)
 					}
 
 					// Below the FOF
-					if (*rover->topheight <= player->mo->z)
+					if (topheight <= player->mo->z)
 					{
 						floorclimb = false;
 						boostup = false;
@@ -2346,7 +2415,7 @@ static void P_DoClimbing(player_t *player)
 					}
 
 					// Above the FOF
-					if (*rover->bottomheight > player->mo->z + player->mo->height - FixedMul(16*FRACUNIT, player->mo->scale))
+					if (bottomheight > player->mo->z + player->mo->height - FixedMul(16*FRACUNIT, player->mo->scale))
 					{
 						floorclimb = false;
 						thrust = true;
@@ -2356,8 +2425,9 @@ static void P_DoClimbing(player_t *player)
 				else
 				{
 					// Trying to climb down past the bottom of a FOF
-					if ((*rover->bottomheight <= player->mo->z) && ((player->mo->z + player->mo->momz) <= *rover->bottomheight))
+					if ((bottomheight <= player->mo->z) && ((player->mo->z + player->mo->momz) <= bottomheight))
 					{
+						fixed_t topheight2;
 						ffloor_t *roverbelow;
 						boolean foundfof = false;
 						floorclimb = true;
@@ -2372,7 +2442,13 @@ static void P_DoClimbing(player_t *player)
 							if (roverbelow == rover)
 								continue;
 
-							if (*roverbelow->topheight > *rover->bottomheight - FixedMul(16*FRACUNIT, player->mo->scale))
+#ifdef ESLOPE
+							topheight2 = *roverbelow->t_slope ? P_GetZAt(*roverbelow->t_slope, player->mo->x, player->mo->y) : *roverbelow->topheight;
+#else
+							topheight2 = *roverbelow->topheight;
+#endif
+
+							if (topheight2 > bottomheight - FixedMul(16*FRACUNIT, player->mo->scale))
 								foundfof = true;
 						}
 
@@ -2381,7 +2457,7 @@ static void P_DoClimbing(player_t *player)
 					}
 
 					// Below the FOF
-					if (*rover->bottomheight >= player->mo->z + player->mo->height)
+					if (bottomheight >= player->mo->z + player->mo->height)
 					{
 						floorclimb = false;
 						boostup = false;
@@ -2389,7 +2465,7 @@ static void P_DoClimbing(player_t *player)
 					}
 
 					// Above the FOF
-					if (*rover->topheight < player->mo->z + FixedMul(16*FRACUNIT, player->mo->scale))
+					if (topheight < player->mo->z + FixedMul(16*FRACUNIT, player->mo->scale))
 					{
 						floorclimb = false;
 						thrust = true;
@@ -2410,7 +2486,7 @@ static void P_DoClimbing(player_t *player)
 		if (player->mo->eflags & MFE_VERTICALFLIP)
 		{
 			// Trying to climb down past the upper texture area
-			if ((glidesector->sector->floorheight >= player->mo->z + player->mo->height) && ((player->mo->z + player->mo->height + player->mo->momz) >= glidesector->sector->floorheight))
+			if ((floorheight >= player->mo->z + player->mo->height) && ((player->mo->z + player->mo->height + player->mo->momz) >= floorheight))
 			{
 				boolean foundfof = false;
 				floorclimb = true;
@@ -2418,13 +2494,20 @@ static void P_DoClimbing(player_t *player)
 				// Is there a FOF directly below that we can move onto?
 				if (glidesector->sector->ffloors)
 				{
+					fixed_t bottomheight;
 					ffloor_t *rover;
 					for (rover = glidesector->sector->ffloors; rover; rover = rover->next)
 					{
 						if (!(rover->flags & FF_EXISTS) || !(rover->flags & FF_BLOCKPLAYER) || (rover->flags & FF_BUSTUP))
 							continue;
 
-						if (*rover->bottomheight < glidesector->sector->floorheight + FixedMul(16*FRACUNIT, player->mo->scale))
+#ifdef ESLOPE
+						bottomheight = *rover->b_slope ? P_GetZAt(*rover->b_slope, player->mo->x, player->mo->y) : *rover->bottomheight;
+#else
+						bottomheight = *rover->bottomheight;
+#endif
+
+						if (bottomheight < floorheight + FixedMul(16*FRACUNIT, player->mo->scale))
 						{
 							foundfof = true;
 							break;
@@ -2437,8 +2520,8 @@ static void P_DoClimbing(player_t *player)
 			}
 
 			// Reached the top of the lower texture area
-			if (!floorclimb && glidesector->sector->ceilingheight > player->mo->z + player->mo->height - FixedMul(16*FRACUNIT, player->mo->scale)
+			if (!floorclimb && ceilingheight > player->mo->z + player->mo->height - FixedMul(16*FRACUNIT, player->mo->scale)
-				&& (glidesector->sector->ceilingpic == skyflatnum || glidesector->sector->floorheight < (player->mo->z - FixedMul(8*FRACUNIT, player->mo->scale))))
+				&& (glidesector->sector->ceilingpic == skyflatnum || floorheight < (player->mo->z - FixedMul(8*FRACUNIT, player->mo->scale))))
 			{
 				thrust = true;
 				boostup = true;
@@ -2448,7 +2531,7 @@ static void P_DoClimbing(player_t *player)
 		else
 		{
 			// Trying to climb down past the upper texture area
-			if ((glidesector->sector->ceilingheight <= player->mo->z) && ((player->mo->z + player->mo->momz) <= glidesector->sector->ceilingheight))
+			if ((ceilingheight <= player->mo->z) && ((player->mo->z + player->mo->momz) <= ceilingheight))
 			{
 				boolean foundfof = false;
 				floorclimb = true;
@@ -2462,7 +2545,7 @@ static void P_DoClimbing(player_t *player)
 						if (!(rover->flags & FF_EXISTS) || !(rover->flags & FF_BLOCKPLAYER) || (rover->flags & FF_BUSTUP))
 							continue;
 
-						if (*rover->topheight > glidesector->sector->ceilingheight - FixedMul(16*FRACUNIT, player->mo->scale))
+						if (*rover->topheight > ceilingheight - FixedMul(16*FRACUNIT, player->mo->scale))
 						{
 							foundfof = true;
 							break;
@@ -2475,7 +2558,7 @@ static void P_DoClimbing(player_t *player)
 			}
 
 			// Allow climbing from a FOF or lower texture onto the upper texture and vice versa.
-			if (player->mo->z > glidesector->sector->ceilingheight - FixedMul(16*FRACUNIT, player->mo->scale))
+			if (player->mo->z > ceilingheight - FixedMul(16*FRACUNIT, player->mo->scale))
 			{
 				floorclimb = true;
 				thrust = false;
@@ -2483,8 +2566,8 @@ static void P_DoClimbing(player_t *player)
 			}
 
 			// Reached the top of the lower texture area
-			if (!floorclimb && glidesector->sector->floorheight < player->mo->z + FixedMul(16*FRACUNIT, player->mo->scale)
+			if (!floorclimb && floorheight < player->mo->z + FixedMul(16*FRACUNIT, player->mo->scale)
-				&& (glidesector->sector->ceilingpic == skyflatnum || glidesector->sector->ceilingheight > (player->mo->z + player->mo->height + FixedMul(8*FRACUNIT, player->mo->scale))))
+				&& (glidesector->sector->ceilingpic == skyflatnum || ceilingheight > (player->mo->z + player->mo->height + FixedMul(8*FRACUNIT, player->mo->scale))))
 			{
 				thrust = true;
 				boostup = true;
@@ -2493,14 +2576,14 @@ static void P_DoClimbing(player_t *player)
 		}
 
 		// Trying to climb on the sky
-		if ((glidesector->sector->ceilingheight < player->mo->z) && glidesector->sector->ceilingpic == skyflatnum)
+		if ((ceilingheight < player->mo->z) && glidesector->sector->ceilingpic == skyflatnum)
 		{
 			skyclimber = true;
 		}
 
 		// Climbing on the lower texture area?
-		if ((!(player->mo->eflags & MFE_VERTICALFLIP) && player->mo->z + FixedMul(16*FRACUNIT, player->mo->scale) < glidesector->sector->floorheight)
+		if ((!(player->mo->eflags & MFE_VERTICALFLIP) && player->mo->z + FixedMul(16*FRACUNIT, player->mo->scale) < floorheight)
-			|| ((player->mo->eflags & MFE_VERTICALFLIP) && player->mo->z + player->mo->height <= glidesector->sector->floorheight))
+			|| ((player->mo->eflags & MFE_VERTICALFLIP) && player->mo->z + player->mo->height <= floorheight))
 		{
 			floorclimb = true;
 
@@ -2516,8 +2599,8 @@ static void P_DoClimbing(player_t *player)
 			}
 		}
 		// Climbing on the upper texture area?
-		else if ((!(player->mo->eflags & MFE_VERTICALFLIP) && player->mo->z >= glidesector->sector->ceilingheight)
+		else if ((!(player->mo->eflags & MFE_VERTICALFLIP) && player->mo->z >= ceilingheight)
-			|| ((player->mo->eflags & MFE_VERTICALFLIP) && player->mo->z + player->mo->height - FixedMul(16*FRACUNIT, player->mo->scale) > glidesector->sector->ceilingheight))
+			|| ((player->mo->eflags & MFE_VERTICALFLIP) && player->mo->z + player->mo->height - FixedMul(16*FRACUNIT, player->mo->scale) > ceilingheight))
 		{
 			floorclimb = true;
 
@@ -3688,7 +3771,11 @@ static void P_DoSpinDash(player_t *player, ticcmd_t *cmd)
 	if ((player->charability2 == CA2_SPINDASH) && !(player->pflags & PF_SLIDING) && !player->exiting
 		&& !P_PlayerInPain(player)) // subsequent revs
 	{
-		if ((cmd->buttons & BT_USE) && player->speed < FixedMul(5<<FRACBITS, player->mo->scale) && !player->mo->momz && onground && !(player->pflags & PF_USEDOWN) && !(player->pflags & PF_SPINNING))
+		if ((cmd->buttons & BT_USE) && player->speed < FixedMul(5<<FRACBITS, player->mo->scale) && !player->mo->momz && onground && !(player->pflags & PF_USEDOWN) && !(player->pflags & PF_SPINNING)
+#ifdef ESLOPE
+			&& (!player->mo->standingslope || abs(player->mo->standingslope->zdelta) < FRACUNIT/2)
+#endif
+			)
 		{
 			player->mo->momx = player->cmomx;
 			player->mo->momy = player->cmomy;
@@ -3717,7 +3804,11 @@ static void P_DoSpinDash(player_t *player, ticcmd_t *cmd)
 		// down the spin button and not spinning.
 		// AKA Just go into a spin on the ground, you idiot. ;)
 		else if ((cmd->buttons & BT_USE || ((twodlevel || (player->mo->flags2 & MF2_TWOD)) && cmd->forwardmove < -20))
-			&& !player->climbing && !player->mo->momz && onground && player->speed > FixedMul(5<<FRACBITS, player->mo->scale) && !(player->pflags & PF_USEDOWN) && !(player->pflags & PF_SPINNING))
+			&& !player->climbing && !player->mo->momz && onground && (player->speed > FixedMul(5<<FRACBITS, player->mo->scale)
+#ifdef ESLOPE
+			|| (player->mo->standingslope && abs(player->mo->standingslope->zdelta) >= FRACUNIT/2)
+#endif
+			) && !(player->pflags & PF_USEDOWN) && !(player->pflags & PF_SPINNING))
 		{
 			player->pflags |= PF_SPINNING;
 			P_SetPlayerMobjState(player->mo, S_PLAY_ATK1);
@@ -3729,7 +3820,11 @@ static void P_DoSpinDash(player_t *player, ticcmd_t *cmd)
 
 	// Rolling normally
 	if (onground && player->pflags & PF_SPINNING && !(player->pflags & PF_STARTDASH)
-		&& player->speed < FixedMul(5*FRACUNIT,player->mo->scale))
+		&& player->speed < FixedMul(5*FRACUNIT,player->mo->scale)
+#ifdef ESLOPE
+			&& (!player->mo->standingslope || abs(player->mo->standingslope->zdelta) < FRACUNIT/2)
+#endif
+			)
 	{
 		if (GETSECSPECIAL(player->mo->subsector->sector->special, 4) == 7 || (player->mo->ceilingz - player->mo->floorz < P_GetPlayerHeight(player)))
 			P_InstaThrust(player->mo, player->mo->angle, FixedMul(10*FRACUNIT, player->mo->scale));
@@ -4433,12 +4528,16 @@ static void P_3dMovement(player_t *player)
 	angle_t dangle; // replaces old quadrants bits
 	fixed_t normalspd = FixedMul(player->normalspeed, player->mo->scale);
 	boolean analogmove = false;
-#ifndef OLD_MOVEMENT_CODE
 	fixed_t oldMagnitude, newMagnitude;
+#ifdef ESLOPE
+	vector3_t totalthrust;
+
+	totalthrust.x = totalthrust.y = 0; // I forget if this is needed
+	totalthrust.z = FRACUNIT*P_MobjFlip(player->mo)/3; // A bit of extra push-back on slopes
+#endif // ESLOPE
 
 	// Get the old momentum; this will be needed at the end of the function! -SH
 	oldMagnitude = R_PointToDist2(player->mo->momx - player->cmomx, player->mo->momy - player->cmomy, 0, 0);
-#endif
 
 	analogmove = P_AnalogMove(player);
 
@@ -4615,17 +4714,10 @@ static void P_3dMovement(player_t *player)
 		}
 
 		movepushforward = FixedMul(movepushforward, player->mo->scale);
-#ifdef OLD_MOVEMENT_CODE
+
-		if (player->speed < topspeed && mforward && cmd->forwardmove > 0) // Sonic's Speed
+#ifdef ESLOPE
-			P_Thrust(player->mo, movepushangle, movepushforward);
+		totalthrust.x += P_ReturnThrustX(player->mo, movepushangle, movepushforward);
-		else if (mforward && cmd->forwardmove < 0)
+		totalthrust.y += P_ReturnThrustY(player->mo, movepushangle, movepushforward);
-			P_Thrust(player->mo, movepushangle, movepushforward);
-		else if (player->speed < topspeed && mbackward && cmd->forwardmove < 0)
-			P_Thrust(player->mo, movepushangle, movepushforward);
-		else if (mbackward && cmd->forwardmove > 0)
-			P_Thrust(player->mo, movepushangle, movepushforward);
-		else if (!mforward && !mbackward)
-			P_Thrust(player->mo, movepushangle, movepushforward);
 #else
 		P_Thrust(player->mo, movepushangle, movepushforward);
 #endif
@@ -4644,33 +4736,12 @@ static void P_3dMovement(player_t *player)
 		if (!(player->pflags & PF_GLIDING || player->exiting || P_PlayerInPain(player)))
 		{
 			angle_t controldirection;
-#ifdef OLD_MOVEMENT_CODE
-			angle_t controlplayerdirection;
-			boolean cforward; // controls pointing forward from the player
-			boolean cbackward; // controls pointing backward from the player
-			angle_t dangle;
 
-			cforward = cbackward = false;
-#endif
 			// Calculate the angle at which the controls are pointing
 			// to figure out the proper mforward and mbackward.
 			// (Why was it so complicated before? ~Red)
 			controldirection = R_PointToAngle2(0, 0, cmd->forwardmove*FRACUNIT, -cmd->sidemove*FRACUNIT)+movepushangle;
 
-#ifdef OLD_MOVEMENT_CODE
-			controlplayerdirection = player->mo->angle;
-
-			dangle = controldirection - controlplayerdirection;
-
-			if (dangle > ANGLE_180) //flip to keep to one side
-				dangle = InvAngle(dangle);
-
-			if (dangle > ANGLE_90)
-				cbackward = true; // Controls pointing backwards from player
-			else
-				cforward = true; // Controls pointing in player's general direction
-#endif
-
 			movepushforward = max(abs(cmd->sidemove), abs(cmd->forwardmove)) * (thrustfactor * acceleration);
 
 			// allow very small movement while in air for gameplay
@@ -4693,13 +4764,10 @@ static void P_3dMovement(player_t *player)
 			movepushsideangle = controldirection;
 
 			movepushforward = FixedMul(movepushforward, player->mo->scale);
-#ifdef OLD_MOVEMENT_CODE
+
-			if (player->speed < topspeed)
+#ifdef ESLOPE
-				P_Thrust(player->mo, controldirection, movepushforward);
+			totalthrust.x += P_ReturnThrustX(player->mo, controldirection, movepushforward);
-			else if ((mforward) && (cbackward))
+			totalthrust.y += P_ReturnThrustY(player->mo, controldirection, movepushforward);
-				P_Thrust(player->mo, controldirection, movepushforward);
-			else if ((mbackward) && (cforward))
-				P_Thrust(player->mo, controldirection, movepushforward);
 #else
 			P_Thrust(player->mo, controldirection, movepushforward);
 #endif
@@ -4707,29 +4775,6 @@ static void P_3dMovement(player_t *player)
 	}
 	else if (cmd->sidemove && !(player->pflags & PF_GLIDING) && !player->exiting && !P_PlayerInPain(player))
 	{
-#ifdef OLD_MOVEMENT_CODE
-		boolean mright = 0;
-		boolean mleft = 0;
-		angle_t sideangle;
-
-		sideangle = player->mo->angle - ANGLE_90;
-
-		// Monster Iestyn - 04-11-13
-		// Quadrants are stupid, excessive and broken, let's do this a much simpler way!
-		// Get delta angle from rmom angle and player angle first
-		dangle = R_PointToAngle2(0,0, player->rmomx, player->rmomy) - sideangle;
-		if (dangle > ANGLE_180)
-			dangle = InvAngle(dangle);
-
-		// now use it to determine direction!
-		if (dangle <= ANGLE_45) // angles 0-45 or 315-360
-			mright = 1; // going right
-		else if (dangle >= ANGLE_135) // angles 135-225
-			mleft = 1; // going left
-
-		// anything else will leave both at 0, so no need to do anything else
-#endif
-
 		movepushside = cmd->sidemove * (thrustfactor * acceleration);
 
 		if (!onground)
@@ -4752,19 +4797,37 @@ static void P_3dMovement(player_t *player)
 
 		// Finally move the player now that his speed/direction has been decided.
 		movepushside = FixedMul(movepushside, player->mo->scale);
-#ifdef OLD_MOVEMENT_CODE
+
-		if (player->speed < topspeed)
+#ifdef ESLOPE
-			P_Thrust(player->mo, movepushsideangle, movepushside);
+		totalthrust.x += P_ReturnThrustX(player->mo, movepushsideangle, movepushside);
-		else if (mright && cmd->sidemove < 0)
+		totalthrust.y += P_ReturnThrustY(player->mo, movepushsideangle, movepushside);
-			P_Thrust(player->mo, movepushsideangle, movepushside);
-		else if (mleft && cmd->sidemove > 0)
-			P_Thrust(player->mo, movepushsideangle, movepushside);
 #else
 		P_Thrust(player->mo, movepushsideangle, movepushside);
 #endif
 	}
 
-#ifndef OLD_MOVEMENT_CODE
+#ifdef ESLOPE
+	if ((totalthrust.x || totalthrust.y)
+		&& player->mo->standingslope && abs(player->mo->standingslope->zdelta) > FRACUNIT/2) {
+		// Factor thrust to slope, but only for the part pushing up it!
+		// The rest is unaffected.
+		angle_t thrustangle = R_PointToAngle2(0, 0, totalthrust.x, totalthrust.y)-player->mo->standingslope->xydirection;
+
+		if (player->mo->standingslope->zdelta < 0) { // Direction goes down, so thrustangle needs to face toward
+			if (thrustangle < ANGLE_90 || thrustangle > ANGLE_270) {
+				P_QuantizeMomentumToSlope(&totalthrust, player->mo->standingslope);
+			}
+		} else { // Direction goes up, so thrustangle needs to face away
+			if (thrustangle > ANGLE_90 && thrustangle < ANGLE_270) {
+				P_QuantizeMomentumToSlope(&totalthrust, player->mo->standingslope);
+			}
+		}
+	}
+
+	player->mo->momx += totalthrust.x;
+	player->mo->momy += totalthrust.y;
+#endif
+
 	// Time to ask three questions:
 	// 1) Are we over topspeed?
 	// 2) If "yes" to 1, were we moving over topspeed to begin with?
@@ -4798,7 +4861,6 @@ static void P_3dMovement(player_t *player)
 			player->mo->momy = tempmomy + player->cmomy;
 		}
 	}
-#endif
 }
 
 //

src/r_bsp.c

@@ -459,6 +459,11 @@ static void R_AddLine(seg_t *line)
 	doorclosed = 0;
 
 	// Closed door.
+#ifdef ESLOPE
+	// Just don't bother checking this if one side is sloped. This is probably inefficient, but it's better than
+	// random renderer stopping around slopes...
+	if (!(frontsector->f_slope || frontsector->c_slope || backsector->f_slope || backsector->c_slope))
+#endif
 	if (backsector->ceilingheight <= frontsector->floorheight
 		|| backsector->floorheight >= frontsector->ceilingheight)
 	{
@@ -487,6 +492,10 @@ static void R_AddLine(seg_t *line)
 #endif
 		backsector->ceilingpic == frontsector->ceilingpic
 		&& backsector->floorpic == frontsector->floorpic
+#ifdef ESLOPE
+		&& backsector->f_slope == frontsector->f_slope
+		&& backsector->c_slope == frontsector->c_slope
+#endif
 		&& backsector->lightlevel == frontsector->lightlevel
 		&& !curline->sidedef->midtexture
 		// Check offsets too!
@@ -842,11 +851,19 @@ static void R_Subsector(size_t num)
 			sub->sector->moved = frontsector->moved = false;
 		}
 
-		light = R_GetPlaneLight(frontsector, frontsector->floorheight, false);
+		light = R_GetPlaneLight(frontsector,
+#ifdef ESLOPE
+								frontsector->f_slope ? P_GetZAt(frontsector->f_slope, frontsector->soundorg.x, frontsector->soundorg.y) :
+#endif
+								frontsector->floorheight, false);
 		if (frontsector->floorlightsec == -1)
 			floorlightlevel = *frontsector->lightlist[light].lightlevel;
 		floorcolormap = frontsector->lightlist[light].extra_colormap;
-		light = R_GetPlaneLight(frontsector, frontsector->ceilingheight, false);
+		light = R_GetPlaneLight(frontsector,
+#ifdef ESLOPE
+								frontsector->c_slope ? P_GetZAt(frontsector->c_slope, frontsector->soundorg.x, frontsector->soundorg.y) :
+#endif
+								frontsector->ceilingheight, false);
 		if (frontsector->ceilinglightsec == -1)
 			ceilinglightlevel = *frontsector->lightlist[light].lightlevel;
 		ceilingcolormap = frontsector->lightlist[light].extra_colormap;
@@ -854,32 +871,52 @@ static void R_Subsector(size_t num)
 
 	sub->sector->extra_colormap = frontsector->extra_colormap;
 
-	if ((frontsector->floorheight < viewz || (frontsector->heightsec != -1
+	if (((
+#ifdef ESLOPE
+			frontsector->f_slope ? P_GetZAt(frontsector->f_slope, viewx, viewy) :
+#endif
+		frontsector->floorheight) < viewz || (frontsector->heightsec != -1
 		&& sectors[frontsector->heightsec].ceilingpic == skyflatnum)))
 	{
 		floorplane = R_FindPlane(frontsector->floorheight, frontsector->floorpic, floorlightlevel,
-			frontsector->floor_xoffs, frontsector->floor_yoffs, frontsector->floorpic_angle, floorcolormap, NULL);
+			frontsector->floor_xoffs, frontsector->floor_yoffs, frontsector->floorpic_angle, floorcolormap, NULL
+#ifdef ESLOPE
+			, frontsector->f_slope
+#endif
+			);
 	}
 	else
 		floorplane = NULL;
 
-	if ((frontsector->ceilingheight > viewz || frontsector->ceilingpic == skyflatnum
+	if (((
+#ifdef ESLOPE
+			frontsector->c_slope ? P_GetZAt(frontsector->c_slope, viewx, viewy) :
+#endif
+		frontsector->ceilingheight) > viewz || frontsector->ceilingpic == skyflatnum
 		|| (frontsector->heightsec != -1
 		&& sectors[frontsector->heightsec].floorpic == skyflatnum)))
 	{
 		ceilingplane = R_FindPlane(frontsector->ceilingheight, frontsector->ceilingpic,
 			ceilinglightlevel, frontsector->ceiling_xoffs, frontsector->ceiling_yoffs, frontsector->ceilingpic_angle,
-			ceilingcolormap, NULL);
+			ceilingcolormap, NULL
+#ifdef ESLOPE
+			, frontsector->c_slope
+#endif
+			);
 	}
 	else
 		ceilingplane = NULL;
 
 	numffloors = 0;
+#ifdef ESLOPE
+	ffloor[numffloors].slope = NULL;
+#endif
 	ffloor[numffloors].plane = NULL;
 	ffloor[numffloors].polyobj = NULL;
 	if (frontsector->ffloors)
 	{
 		ffloor_t *rover;
+		fixed_t heightcheck;
 
 		for (rover = frontsector->ffloors; rover && numffloors < MAXFFLOORS; rover = rover->next)
 		{
@@ -897,18 +934,47 @@ static void R_Subsector(size_t num)
 
 			ffloor[numffloors].plane = NULL;
 			ffloor[numffloors].polyobj = NULL;
+
+			heightcheck =
+#ifdef ESLOPE
+				*rover->b_slope ? P_GetZAt(*rover->b_slope, viewx, viewy) :
+#endif
+				*rover->bottomheight;
 			if (*rover->bottomheight <= frontsector->ceilingheight
 				&& *rover->bottomheight >= frontsector->floorheight
-				&& ((viewz < *rover->bottomheight && !(rover->flags & FF_INVERTPLANES))
+				&& ((viewz < heightcheck && !(rover->flags & FF_INVERTPLANES))
-				|| (viewz > *rover->bottomheight && (rover->flags & FF_BOTHPLANES))))
+				|| (viewz > heightcheck && (rover->flags & FF_BOTHPLANES))))
 			{
+#ifdef ESLOPE
+				light = R_GetPlaneLight(frontsector,
+					*rover->b_slope ? P_GetZAt(*rover->b_slope, frontsector->soundorg.x, frontsector->soundorg.y) : *rover->bottomheight,
+					viewz < heightcheck);
+#else
 				light = R_GetPlaneLight(frontsector, *rover->bottomheight,
 					viewz < *rover->bottomheight);
+#endif
 				ffloor[numffloors].plane = R_FindPlane(*rover->bottomheight, *rover->bottompic,
 					*frontsector->lightlist[light].lightlevel, *rover->bottomxoffs,
-					*rover->bottomyoffs, *rover->bottomangle, frontsector->lightlist[light].extra_colormap, rover);
+					*rover->bottomyoffs, *rover->bottomangle, frontsector->lightlist[light].extra_colormap, rover
+#ifdef ESLOPE
+					, *rover->b_slope
+#endif
+					);
+
+#ifdef ESLOPE
+				ffloor[numffloors].slope = *rover->b_slope;
+
+				// Tell the renderer this sector has slopes in it.
+				if (ffloor[numffloors].slope)
+					frontsector->hasslope = true;
+#endif
+
+				ffloor[numffloors].height =
+#ifdef ESLOPE
+				*rover->b_slope ? P_GetZAt(*rover->b_slope, viewx, viewy) :
+#endif
+				*rover->bottomheight;
 
-				ffloor[numffloors].height = *rover->bottomheight;
 				ffloor[numffloors].ffloor = rover;
 				numffloors++;
 			}
@@ -916,16 +982,46 @@ static void R_Subsector(size_t num)
 				break;
 			ffloor[numffloors].plane = NULL;
 			ffloor[numffloors].polyobj = NULL;
+
+			heightcheck =
+#ifdef ESLOPE
+				*rover->t_slope ? P_GetZAt(*rover->t_slope, viewx, viewy) :
+#endif
+				*rover->topheight;
 			if (*rover->topheight >= frontsector->floorheight
 				&& *rover->topheight <= frontsector->ceilingheight
-				&& ((viewz > *rover->topheight && !(rover->flags & FF_INVERTPLANES))
+				&& ((viewz > heightcheck && !(rover->flags & FF_INVERTPLANES))
-				|| (viewz < *rover->topheight && (rover->flags & FF_BOTHPLANES))))
+				|| (viewz < heightcheck && (rover->flags & FF_BOTHPLANES))))
 			{
+#ifdef ESLOPE
+				light = R_GetPlaneLight(frontsector,
+					*rover->t_slope ? P_GetZAt(*rover->t_slope, frontsector->soundorg.x, frontsector->soundorg.y) : *rover->topheight,
+					viewz < heightcheck);
+#else
 				light = R_GetPlaneLight(frontsector, *rover->topheight, viewz < *rover->topheight);
+#endif
 				ffloor[numffloors].plane = R_FindPlane(*rover->topheight, *rover->toppic,
 					*frontsector->lightlist[light].lightlevel, *rover->topxoffs, *rover->topyoffs, *rover->topangle,
-					frontsector->lightlist[light].extra_colormap, rover);
+					frontsector->lightlist[light].extra_colormap, rover
-				ffloor[numffloors].height = *rover->topheight;
+#ifdef ESLOPE
+					, *rover->t_slope
+#endif
+					);
+
+#ifdef ESLOPE
+				ffloor[numffloors].slope = *rover->t_slope;
+
+				// Tell the renderer this sector has slopes in it.
+				if (ffloor[numffloors].slope)
+					frontsector->hasslope = true;
+#endif
+
+				ffloor[numffloors].height =
+#ifdef ESLOPE
+				*rover->t_slope ? P_GetZAt(*rover->t_slope, viewx, viewy) :
+#endif
+				*rover->topheight;
+
 				ffloor[numffloors].ffloor = rover;
 				numffloors++;
 			}
@@ -977,11 +1073,18 @@ static void R_Subsector(size_t num)
 						polysec->lightlevel, xoff, yoff,
 						polysec->floorpic_angle-po->angle,
 						NULL,
-						NULL);
+						NULL
+#ifdef ESLOPE
+					, NULL // will ffloors be slopable eventually?
+#endif
+					);
 				//ffloor[numffloors].plane->polyobj = po;
 
 				ffloor[numffloors].height = polysec->floorheight;
 				ffloor[numffloors].polyobj = po;
+#ifdef ESLOPE
+				ffloor[numffloors].slope = NULL;
+#endif
 //				ffloor[numffloors].ffloor = rover;
 				po->visplane = ffloor[numffloors].plane;
 				numffloors++;
@@ -1014,11 +1117,18 @@ static void R_Subsector(size_t num)
 				light = 0;
 				ffloor[numffloors].plane = R_FindPlane(polysec->ceilingheight, polysec->ceilingpic,
 					polysec->lightlevel, xoff, yoff, polysec->ceilingpic_angle-po->angle,
-					NULL, NULL);
+					NULL, NULL
+#ifdef ESLOPE
+					, NULL // will ffloors be slopable eventually?
+#endif
+					);
 				//ffloor[numffloors].plane->polyobj = po;
 
 				ffloor[numffloors].polyobj = po;
 				ffloor[numffloors].height = polysec->ceilingheight;
+#ifdef ESLOPE
+				ffloor[numffloors].slope = NULL;
+#endif
 //				ffloor[numffloors].ffloor = rover;
 				po->visplane = ffloor[numffloors].plane;
 				numffloors++;
@@ -1077,6 +1187,11 @@ void R_Prep3DFloors(sector_t *sector)
 	fixed_t bestheight, maxheight;
 	INT32 count, i, mapnum;
 	sector_t *sec;
+#ifdef ESLOPE
+	pslope_t *bestslope;
+	fixed_t heighttest; // I think it's better to check the Z height at the sector's center
+	                    // than assume unsloped heights are accurate indicators of order in sloped sectors. -Red
+#endif
 
 	count = 1;
 	for (rover = sector->ffloors; rover; rover = rover->next)
@@ -1099,7 +1214,14 @@ void R_Prep3DFloors(sector_t *sector)
 	else
 		memset(sector->lightlist, 0, sizeof (lightlist_t) * count);
 
+#ifdef ESLOPE
+	heighttest = sector->c_slope ? P_GetZAt(sector->c_slope, sector->soundorg.x, sector->soundorg.y) : sector->ceilingheight;
+
+	sector->lightlist[0].height = heighttest + 1;
+	sector->lightlist[0].slope = sector->c_slope;
+#else
 	sector->lightlist[0].height = sector->ceilingheight + 1;
+#endif
 	sector->lightlist[0].lightlevel = &sector->lightlevel;
 	sector->lightlist[0].caster = NULL;
 	sector->lightlist[0].extra_colormap = sector->extra_colormap;
@@ -1117,6 +1239,29 @@ void R_Prep3DFloors(sector_t *sector)
 				&& !(rover->flags & FF_CUTLEVEL) && !(rover->flags & FF_CUTSPRITES)))
 			continue;
 
+#ifdef ESLOPE
+			heighttest = *rover->t_slope ? P_GetZAt(*rover->t_slope, sector->soundorg.x, sector->soundorg.y) : *rover->topheight;
+
+			if (heighttest > bestheight && heighttest < maxheight)
+			{
+				best = rover;
+				bestheight = heighttest;
+				bestslope = *rover->t_slope;
+				continue;
+			}
+			if (rover->flags & FF_DOUBLESHADOW) {
+				heighttest = *rover->b_slope ? P_GetZAt(*rover->b_slope, sector->soundorg.x, sector->soundorg.y) : *rover->bottomheight;
+
+				if (heighttest > bestheight
+					&& heighttest < maxheight)
+				{
+					best = rover;
+					bestheight = heighttest;
+					bestslope = *rover->b_slope;
+					continue;
+				}
+			}
+#else
 			if (*rover->topheight > bestheight && *rover->topheight < maxheight)
 			{
 				best = rover;
@@ -1130,6 +1275,7 @@ void R_Prep3DFloors(sector_t *sector)
 				bestheight = *rover->bottomheight;
 				continue;
 			}
+#endif
 		}
 		if (!best)
 		{
@@ -1140,6 +1286,9 @@ void R_Prep3DFloors(sector_t *sector)
 		sector->lightlist[i].height = maxheight = bestheight;
 		sector->lightlist[i].caster = best;
 		sector->lightlist[i].flags = best->flags;
+#ifdef ESLOPE
+		sector->lightlist[i].slope = bestslope;
+#endif
 		sec = &sectors[best->secnum];
 		mapnum = sec->midmap;
 		if (mapnum >= 0 && (size_t)mapnum < num_extra_colormaps)
@@ -1165,7 +1314,12 @@ void R_Prep3DFloors(sector_t *sector)
 
 		if (best->flags & FF_DOUBLESHADOW)
 		{
+#ifdef ESLOPE
+			heighttest = *best->b_slope ? P_GetZAt(*best->b_slope, sector->soundorg.x, sector->soundorg.y) : *best->bottomheight;
+			if (bestheight == heighttest) ///TODO: do this in a more efficient way -Red
+#else
 			if (bestheight == *best->bottomheight)
+#endif
 			{
 				sector->lightlist[i].lightlevel = sector->lightlist[best->lastlight].lightlevel;
 				sector->lightlist[i].extra_colormap =

src/r_defs.h

@@ -155,6 +155,12 @@ typedef struct ffloor_s
 	fixed_t *bottomyoffs;
 	angle_t *bottomangle;
 
+#ifdef ESLOPE
+	// Pointers to pointers. Yup.
+	struct pslope_s **t_slope;
+	struct pslope_s **b_slope;
+#endif
+
 	size_t secnum;
 	ffloortype_e flags;
 	struct line_s *master;
@@ -184,6 +190,9 @@ typedef struct lightlist_s
 	extracolormap_t *extra_colormap;
 	INT32 flags;
 	ffloor_t *caster;
+#ifdef ESLOPE
+	struct pslope_s *slope; // FF_DOUBLESHADOW makes me have to store this pointer here. Bluh bluh.
+#endif
 } lightlist_t;
 
 
@@ -224,6 +233,52 @@ typedef struct secplane_t
 	fixed_t a, b, c, d, ic;
 } secplane_t;
 
+// Slopes
+#ifdef ESLOPE
+typedef enum {
+	SL_NOPHYSICS = 1, // Don't do momentum adjustment with this slope
+	SL_NODYNAMIC = 1<<1, // Slope will never need to move during the level, so don't fuss with recalculating it
+	SL_ANCHORVERTEX = 1<<2, // Slope is using a Slope Vertex Thing to anchor its position
+	SL_VERTEXSLOPE = 1<<3, // Slope is built from three Slope Vertex Things
+} slopeflags_t;
+
+typedef struct pslope_s
+{
+	UINT16 id; // The number of the slope, mostly used for netgame syncing purposes
+
+	// --- Information used in clipping/projection ---
+	// Origin vector for the plane
+	vector3_t o;
+
+	// 2-Dimentional vector (x, y) normalized. Used to determine distance from
+	// the origin in 2d mapspace. (Basically a thrust of FRACUNIT in xydirection angle)
+	vector2_t d;
+
+	// The rate at which z changes based on distance from the origin plane.
+	fixed_t zdelta;
+
+	// The normal of the slope; will always point upward, and thus be inverted on ceilings. I think it's only needed for physics? -Red
+	vector3_t normal;
+
+	// For comparing when a slope should be rendered
+	fixed_t lowz;
+	fixed_t highz;
+
+	// This values only check and must be updated if the slope itself is modified
+	angle_t zangle; // Angle of the plane going up from the ground (not mesured in degrees)
+	angle_t xydirection; // The direction the slope is facing (north, west, south, etc.)
+
+	struct line_s *sourceline; // The line that generated the slope
+	fixed_t extent; // Distance value used for recalculating zdelta
+	UINT8 refpos; // 1=front floor 2=front ceiling 3=back floor 4=back ceiling (used for dynamic sloping)
+
+	UINT8 flags; // Slope options
+	mapthing_t **vertices; // List should be three long for slopes made by vertex things, or one long for slopes using one vertex thing to anchor
+
+	struct pslope_s *next; // Make a linked list of dynamic slopes, for easy reference later
+} pslope_t;
+#endif
+
 typedef enum
 {
 	SF_FLIPSPECIAL_FLOOR    =  1,
@@ -337,6 +392,13 @@ typedef struct sector_s
 	precipmobj_t *preciplist;
 	struct mprecipsecnode_s *touching_preciplist;
 
+#ifdef ESLOPE
+	// Eternity engine slope
+	pslope_t *f_slope; // floor slope
+	pslope_t *c_slope; // ceiling slope
+	boolean hasslope; // The sector, or one of its visible FOFs, contains a slope
+#endif
+
 	// these are saved for netgames, so do not let Lua touch these!
 
 	// offsets sector spawned with (via linedef type 7)
@@ -612,6 +674,12 @@ typedef struct drawseg_s
 	INT16 *thicksidecol;
 	INT32 numthicksides;
 	fixed_t frontscale[MAXVIDWIDTH];
+
+#ifdef ESLOPE
+	fixed_t maskedtextureheight[MAXVIDWIDTH]; // For handling sloped midtextures
+
+	vertex_t leftpos, rightpos; // Used for rendering FOF walls with slopes
+#endif
 } drawseg_t;
 
 typedef enum

src/r_draw.c

@@ -103,6 +103,12 @@ fixed_t ds_xfrac, ds_yfrac, ds_xstep, ds_ystep;
 UINT8 *ds_source; // start of a 64*64 tile image
 UINT8 *ds_transmap; // one of the translucency tables
 
+#ifdef ESLOPE
+pslope_t *ds_slope; // Current slope being used
+floatv3_t ds_su, ds_sv, ds_sz; // Vectors for... stuff?
+float focallengthf, zeroheight;
+#endif
+
 /**	\brief Variable flat sizes
 */
 

src/r_draw.h

@@ -60,6 +60,16 @@ extern fixed_t ds_xfrac, ds_yfrac, ds_xstep, ds_ystep;
 extern UINT8 *ds_source; // start of a 64*64 tile image
 extern UINT8 *ds_transmap;
 
+#ifdef ESLOPE
+typedef struct {
+	float x, y, z;
+} floatv3_t;
+
+pslope_t *ds_slope; // Current slope being used
+floatv3_t ds_su, ds_sv, ds_sz; // Vectors for... stuff?
+float focallengthf, zeroheight;
+#endif
+
 // Variable flat sizes
 extern UINT32 nflatxshift;
 extern UINT32 nflatyshift;
@@ -141,6 +151,11 @@ void ASMCALL R_DrawSpan_8_MMX(void);
 void R_DrawTranslatedColumn_8(void);
 void R_DrawTranslatedTranslucentColumn_8(void);
 void R_DrawSpan_8(void);
+#ifdef ESLOPE
+void R_DrawTiltedSpan_8(void);
+void R_DrawTiltedTranslucentSpan_8(void);
+void R_DrawTiltedSplat_8(void);
+#endif
 void R_DrawSplat_8(void);
 void R_DrawTranslucentSplat_8(void);
 void R_DrawTranslucentSpan_8(void);

src/r_draw8.c

@@ -526,6 +526,436 @@ void R_DrawSpan_8 (void)
 	}
 }
 
+#ifdef ESLOPE
+// R_CalcTiltedLighting
+// Exactly what it says on the tin. I wish I wasn't too lazy to explain things properly.
+static size_t tiltlighting[MAXVIDWIDTH];
+void R_CalcTiltedLighting(fixed_t start, fixed_t end)
+{
+	// ZDoom uses a different lighting setup to us, and I couldn't figure out how to adapt their version
+	// of this function. Here's my own.
+	INT32 left = ds_x1, right = ds_x2;
+	fixed_t step = (end-start)/(ds_x2-ds_x1+1);
+	size_t i;
+
+	// I wanna do some optimizing by checking for out-of-range segments on either side to fill in all at once,
+	// but I'm too bad at coding to not crash the game trying to do that. I guess this is fast enough for now...
+
+	for (i = left; i <= right; i++) {
+		tiltlighting[i] = (start += step) >> FRACBITS;
+		if (tiltlighting[i] < 0)
+			tiltlighting[i] = 0;
+		else if (tiltlighting[i] >= MAXLIGHTSCALE)
+			tiltlighting[i] = MAXLIGHTSCALE-1;
+	}
+}
+
+
+/**	\brief The R_DrawTiltedSpan_8 function
+	Draw slopes! Holy sheit!
+*/
+void R_DrawTiltedSpan_8(void)
+{
+	// x1, x2 = ds_x1, ds_x2
+	int width = ds_x2 - ds_x1;
+	double iz, uz, vz;
+	UINT32 u, v;
+	int i;
+
+	UINT8 *source;
+	UINT8 *colormap;
+	UINT8 *dest;
+
+	iz = ds_sz.z + ds_sz.y*(centery-ds_y) + ds_sz.x*(ds_x1-centerx);
+
+	// Lighting is simple. It's just linear interpolation from start to end
+	{
+		float planelightfloat = BASEVIDWIDTH*BASEVIDWIDTH/vid.width / (zeroheight - FIXED_TO_FLOAT(viewz)) / 21.0f;
+		float lightstart, lightend;
+
+		lightend = (iz + ds_sz.x*width) * planelightfloat;
+		lightstart = iz * planelightfloat;
+
+		R_CalcTiltedLighting(FLOAT_TO_FIXED(lightstart), FLOAT_TO_FIXED(lightend));
+		//CONS_Printf("tilted lighting %f to %f (foc %f)\n", lightstart, lightend, focallengthf);
+	}
+
+	uz = ds_su.z + ds_su.y*(centery-ds_y) + ds_su.x*(ds_x1-centerx);
+	vz = ds_sv.z + ds_sv.y*(centery-ds_y) + ds_sv.x*(ds_x1-centerx);
+
+	dest = ylookup[ds_y] + columnofs[ds_x1];
+	source = ds_source;
+	//colormap = ds_colormap;
+
+#if 0	// The "perfect" reference version of this routine. Pretty slow.
+		// Use it only to see how things are supposed to look.
+	i = 0;
+	do
+	{
+		double z = 1.f/iz;
+		u = (INT64)(uz*z) + viewx;
+		v = (INT64)(vz*z) + viewy;
+
+		colormap = planezlight[tiltlighting[ds_x1++]] + (ds_colormap - colormaps);
+
+		*dest = colormap[source[((v >> nflatyshift) & nflatmask) | (u >> nflatxshift)]];
+		dest++;
+		iz += ds_sz.x;
+		uz += ds_su.x;
+		vz += ds_sv.x;
+	} while (--width >= 0);
+#else
+#define SPANSIZE 16
+#define INVSPAN	0.0625f
+
+	double startz = 1.f/iz;
+	double startu = uz*startz;
+	double startv = vz*startz;
+	double izstep, uzstep, vzstep;
+
+	izstep = ds_sz.x * SPANSIZE;
+	uzstep = ds_su.x * SPANSIZE;
+	vzstep = ds_sv.x * SPANSIZE;
+	//x1 = 0;
+	width++;
+
+	while (width >= SPANSIZE)
+	{
+		iz += izstep;
+		uz += uzstep;
+		vz += vzstep;
+
+		double endz = 1.f/iz;
+		double endu = uz*endz;
+		double endv = vz*endz;
+		UINT32 stepu = (INT64)((endu - startu) * INVSPAN);
+		UINT32 stepv = (INT64)((endv - startv) * INVSPAN);
+		u = (INT64)(startu) + viewx;
+		v = (INT64)(startv) + viewy;
+
+		for (i = SPANSIZE-1; i >= 0; i--)
+		{
+			colormap = planezlight[tiltlighting[ds_x1++]] + (ds_colormap - colormaps);
+			*dest = colormap[source[((v >> nflatyshift) & nflatmask) | (u >> nflatxshift)]];
+			dest++;
+			u += stepu;
+			v += stepv;
+		}
+		startu = endu;
+		startv = endv;
+		width -= SPANSIZE;
+	}
+	if (width > 0)
+	{
+		if (width == 1)
+		{
+			u = (INT64)(startu);
+			v = (INT64)(startv);
+			colormap = planezlight[tiltlighting[ds_x1++]] + (ds_colormap - colormaps);
+			*dest = colormap[source[((v >> nflatyshift) & nflatmask) | (u >> nflatxshift)]];
+		}
+		else
+		{
+			double left = width;
+			iz += ds_sz.x * left;
+			uz += ds_su.x * left;
+			vz += ds_sv.x * left;
+
+			double endz = 1.f/iz;
+			double endu = uz*endz;
+			double endv = vz*endz;
+			left = 1.f/left;
+			UINT32 stepu = (INT64)((endu - startu) * left);
+			UINT32 stepv = (INT64)((endv - startv) * left);
+			u = (INT64)(startu) + viewx;
+			v = (INT64)(startv) + viewy;
+
+			for (; width != 0; width--)
+			{
+				colormap = planezlight[tiltlighting[ds_x1++]] + (ds_colormap - colormaps);
+				*dest = colormap[source[((v >> nflatyshift) & nflatmask) | (u >> nflatxshift)]];
+				dest++;
+				u += stepu;
+				v += stepv;
+			}
+		}
+	}
+#endif
+}
+
+
+/**	\brief The R_DrawTiltedTranslucentSpan_8 function
+	Like DrawTiltedSpan, but translucent
+*/
+void R_DrawTiltedTranslucentSpan_8(void)
+{
+	// x1, x2 = ds_x1, ds_x2
+	int width = ds_x2 - ds_x1;
+	double iz, uz, vz;
+	UINT32 u, v;
+	int i;
+
+	UINT8 *source;
+	UINT8 *colormap;
+	UINT8 *dest;
+
+	iz = ds_sz.z + ds_sz.y*(centery-ds_y) + ds_sz.x*(ds_x1-centerx);
+
+	// Lighting is simple. It's just linear interpolation from start to end
+	{
+		float planelightfloat = BASEVIDWIDTH*BASEVIDWIDTH/vid.width / (zeroheight - FIXED_TO_FLOAT(viewz)) / 21.0f;
+		float lightstart, lightend;
+
+		lightend = (iz + ds_sz.x*width) * planelightfloat;
+		lightstart = iz * planelightfloat;
+
+		R_CalcTiltedLighting(FLOAT_TO_FIXED(lightstart), FLOAT_TO_FIXED(lightend));
+		//CONS_Printf("tilted lighting %f to %f (foc %f)\n", lightstart, lightend, focallengthf);
+	}
+
+	uz = ds_su.z + ds_su.y*(centery-ds_y) + ds_su.x*(ds_x1-centerx);
+	vz = ds_sv.z + ds_sv.y*(centery-ds_y) + ds_sv.x*(ds_x1-centerx);
+
+	dest = ylookup[ds_y] + columnofs[ds_x1];
+	source = ds_source;
+	//colormap = ds_colormap;
+
+#if 0	// The "perfect" reference version of this routine. Pretty slow.
+		// Use it only to see how things are supposed to look.
+	i = 0;
+	do
+	{
+		double z = 1.f/iz;
+		u = (INT64)(uz*z) + viewx;
+		v = (INT64)(vz*z) + viewy;
+
+		colormap = planezlight[tiltlighting[ds_x1++]] + (ds_colormap - colormaps);
+
+		*dest = colormap[*(ds_transmap + (source[((v >> nflatyshift) & nflatmask) | (u >> nflatxshift)] << 8) + dest[0])];
+		dest++;
+		iz += ds_sz.x;
+		uz += ds_su.x;
+		vz += ds_sv.x;
+	} while (--width >= 0);
+#else
+#define SPANSIZE 16
+#define INVSPAN	0.0625f
+
+	double startz = 1.f/iz;
+	double startu = uz*startz;
+	double startv = vz*startz;
+	double izstep, uzstep, vzstep;
+
+	izstep = ds_sz.x * SPANSIZE;
+	uzstep = ds_su.x * SPANSIZE;
+	vzstep = ds_sv.x * SPANSIZE;
+	//x1 = 0;
+	width++;
+
+	while (width >= SPANSIZE)
+	{
+		iz += izstep;
+		uz += uzstep;
+		vz += vzstep;
+
+		double endz = 1.f/iz;
+		double endu = uz*endz;
+		double endv = vz*endz;
+		UINT32 stepu = (INT64)((endu - startu) * INVSPAN);
+		UINT32 stepv = (INT64)((endv - startv) * INVSPAN);
+		u = (INT64)(startu) + viewx;
+		v = (INT64)(startv) + viewy;
+
+		for (i = SPANSIZE-1; i >= 0; i--)
+		{
+			colormap = planezlight[tiltlighting[ds_x1++]] + (ds_colormap - colormaps);
+			*dest = colormap[*(ds_transmap + (source[((v >> nflatyshift) & nflatmask) | (u >> nflatxshift)] << 8) + dest[0])];
+			dest++;
+			u += stepu;
+			v += stepv;
+		}
+		startu = endu;
+		startv = endv;
+		width -= SPANSIZE;
+	}
+	if (width > 0)
+	{
+		if (width == 1)
+		{
+			u = (INT64)(startu);
+			v = (INT64)(startv);
+			colormap = planezlight[tiltlighting[ds_x1++]] + (ds_colormap - colormaps);
+			*dest = colormap[*(ds_transmap + (source[((v >> nflatyshift) & nflatmask) | (u >> nflatxshift)] << 8) + dest[0])];
+		}
+		else
+		{
+			double left = width;
+			iz += ds_sz.x * left;
+			uz += ds_su.x * left;
+			vz += ds_sv.x * left;
+
+			double endz = 1.f/iz;
+			double endu = uz*endz;
+			double endv = vz*endz;
+			left = 1.f/left;
+			UINT32 stepu = (INT64)((endu - startu) * left);
+			UINT32 stepv = (INT64)((endv - startv) * left);
+			u = (INT64)(startu) + viewx;
+			v = (INT64)(startv) + viewy;
+
+			for (; width != 0; width--)
+			{
+				colormap = planezlight[tiltlighting[ds_x1++]] + (ds_colormap - colormaps);
+				*dest = colormap[*(ds_transmap + (source[((v >> nflatyshift) & nflatmask) | (u >> nflatxshift)] << 8) + dest[0])];
+				dest++;
+				u += stepu;
+				v += stepv;
+			}
+		}
+	}
+#endif
+}
+
+void R_DrawTiltedSplat_8(void)
+{
+	// x1, x2 = ds_x1, ds_x2
+	int width = ds_x2 - ds_x1;
+	double iz, uz, vz;
+	UINT32 u, v;
+	int i;
+
+	UINT8 *source;
+	UINT8 *colormap;
+	UINT8 *dest;
+
+	UINT8 val;
+
+	iz = ds_sz.z + ds_sz.y*(centery-ds_y) + ds_sz.x*(ds_x1-centerx);
+
+	// Lighting is simple. It's just linear interpolation from start to end
+	{
+		float planelightfloat = BASEVIDWIDTH*BASEVIDWIDTH/vid.width / (zeroheight - FIXED_TO_FLOAT(viewz)) / 21.0f;
+		float lightstart, lightend;
+
+		lightend = (iz + ds_sz.x*width) * planelightfloat;
+		lightstart = iz * planelightfloat;
+
+		R_CalcTiltedLighting(FLOAT_TO_FIXED(lightstart), FLOAT_TO_FIXED(lightend));
+		//CONS_Printf("tilted lighting %f to %f (foc %f)\n", lightstart, lightend, focallengthf);
+	}
+
+	uz = ds_su.z + ds_su.y*(centery-ds_y) + ds_su.x*(ds_x1-centerx);
+	vz = ds_sv.z + ds_sv.y*(centery-ds_y) + ds_sv.x*(ds_x1-centerx);
+
+	dest = ylookup[ds_y] + columnofs[ds_x1];
+	source = ds_source;
+	//colormap = ds_colormap;
+
+#if 0	// The "perfect" reference version of this routine. Pretty slow.
+		// Use it only to see how things are supposed to look.
+	i = 0;
+	do
+	{
+		double z = 1.f/iz;
+		u = (INT64)(uz*z) + viewx;
+		v = (INT64)(vz*z) + viewy;
+
+		colormap = planezlight[tiltlighting[ds_x1++]] + (ds_colormap - colormaps);
+
+		val = colormap[source[((v >> nflatyshift) & nflatmask) | (u >> nflatxshift)]];
+		if (val != TRANSPARENTPIXEL)
+			*dest = val;
+		dest++;
+		iz += ds_sz.x;
+		uz += ds_su.x;
+		vz += ds_sv.x;
+	} while (--width >= 0);
+#else
+#define SPANSIZE 16
+#define INVSPAN	0.0625f
+
+	double startz = 1.f/iz;
+	double startu = uz*startz;
+	double startv = vz*startz;
+	double izstep, uzstep, vzstep;
+
+	izstep = ds_sz.x * SPANSIZE;
+	uzstep = ds_su.x * SPANSIZE;
+	vzstep = ds_sv.x * SPANSIZE;
+	//x1 = 0;
+	width++;
+
+	while (width >= SPANSIZE)
+	{
+		iz += izstep;
+		uz += uzstep;
+		vz += vzstep;
+
+		double endz = 1.f/iz;
+		double endu = uz*endz;
+		double endv = vz*endz;
+		UINT32 stepu = (INT64)((endu - startu) * INVSPAN);
+		UINT32 stepv = (INT64)((endv - startv) * INVSPAN);
+		u = (INT64)(startu) + viewx;
+		v = (INT64)(startv) + viewy;
+
+		for (i = SPANSIZE-1; i >= 0; i--)
+		{
+			colormap = planezlight[tiltlighting[ds_x1++]] + (ds_colormap - colormaps);
+			val = colormap[source[((v >> nflatyshift) & nflatmask) | (u >> nflatxshift)]];
+			if (val != TRANSPARENTPIXEL)
+				*dest = val;
+			dest++;
+			u += stepu;
+			v += stepv;
+		}
+		startu = endu;
+		startv = endv;
+		width -= SPANSIZE;
+	}
+	if (width > 0)
+	{
+		if (width == 1)
+		{
+			u = (INT64)(startu);
+			v = (INT64)(startv);
+			colormap = planezlight[tiltlighting[ds_x1++]] + (ds_colormap - colormaps);
+			val = colormap[source[((v >> nflatyshift) & nflatmask) | (u >> nflatxshift)]];
+			if (val != TRANSPARENTPIXEL)
+				*dest = val;
+		}
+		else
+		{
+			double left = width;
+			iz += ds_sz.x * left;
+			uz += ds_su.x * left;
+			vz += ds_sv.x * left;
+
+			double endz = 1.f/iz;
+			double endu = uz*endz;
+			double endv = vz*endz;
+			left = 1.f/left;
+			UINT32 stepu = (INT64)((endu - startu) * left);
+			UINT32 stepv = (INT64)((endv - startv) * left);
+			u = (INT64)(startu) + viewx;
+			v = (INT64)(startv) + viewy;
+
+			for (; width != 0; width--)
+			{
+				colormap = planezlight[tiltlighting[ds_x1++]] + (ds_colormap - colormaps);
+				val = colormap[source[((v >> nflatyshift) & nflatmask) | (u >> nflatxshift)]];
+				if (val != TRANSPARENTPIXEL)
+					*dest = val;
+				dest++;
+				u += stepu;
+				v += stepv;
+			}
+		}
+	}
+#endif
+}
+#endif // ESLOPE
+
 /**	\brief The R_DrawSplat_8 function
 	Just like R_DrawSpan_8, but skips transparent pixels.
 */

src/r_main.c

@@ -527,6 +527,8 @@ static void R_InitTextureMapping(void)
 	focallength = FixedDiv(centerxfrac,
 		FINETANGENT(FINEANGLES/4+/*cv_fov.value*/ FIELDOFVIEW/2));
 
+	focallengthf = FIXED_TO_FLOAT(focallength);
+
 	for (i = 0; i < FINEANGLES/2; i++)
 	{
 		if (FINETANGENT(i) > FRACUNIT*2)

src/r_plane.c

@@ -74,7 +74,7 @@ static INT32 spanstart[MAXVIDHEIGHT];
 //
 // texture mapping
 //
-static lighttable_t **planezlight;
+lighttable_t **planezlight;
 static fixed_t planeheight;
 
 //added : 10-02-98: yslopetab is what yslope used to be,
@@ -327,6 +327,11 @@ void R_MapPlane(INT32 y, INT32 x1, INT32 x2)
 	if (pindex >= MAXLIGHTZ)
 		pindex = MAXLIGHTZ - 1;
 
+#ifdef ESLOPE
+	if (currentplane->slope)
+		ds_colormap = colormaps;
+	else
+#endif
 	ds_colormap = planezlight[pindex];
 
 	if (currentplane->extra_colormap)
@@ -423,11 +428,18 @@ static visplane_t *new_visplane(unsigned hash)
 //
 visplane_t *R_FindPlane(fixed_t height, INT32 picnum, INT32 lightlevel,
 	fixed_t xoff, fixed_t yoff, angle_t plangle, extracolormap_t *planecolormap,
-	ffloor_t *pfloor)
+	ffloor_t *pfloor
+#ifdef ESLOPE
+			, pslope_t *slope
+#endif
+			)
 {
 	visplane_t *check;
 	unsigned hash;
 
+#ifdef ESLOPE
+	if (slope); else // Don't mess with this right now if a slope is involved
+#endif
 	if (plangle != 0)
 	{
 		// Add the view offset, rotated by the plane angle.
@@ -462,7 +474,11 @@ visplane_t *R_FindPlane(fixed_t height, INT32 picnum, INT32 lightlevel,
 			&& xoff == check->xoffs && yoff == check->yoffs
 			&& planecolormap == check->extra_colormap
 			&& !pfloor && !check->ffloor && check->viewz == viewz
-			&& check->viewangle == viewangle)
+			&& check->viewangle == viewangle
+#ifdef ESLOPE
+			&& check->slope == slope
+#endif
+			)
 		{
 			return check;
 		}
@@ -485,6 +501,9 @@ visplane_t *R_FindPlane(fixed_t height, INT32 picnum, INT32 lightlevel,
 #ifdef POLYOBJECTS_PLANES
 	check->polyobj = NULL;
 #endif
+#ifdef ESLOPE
+	check->slope = slope;
+#endif
 
 	memset(check->top, 0xff, sizeof (check->top));
 	memset(check->bottom, 0x00, sizeof (check->bottom));
@@ -551,6 +570,9 @@ visplane_t *R_CheckPlane(visplane_t *pl, INT32 start, INT32 stop)
 		new_pl->plangle = pl->plangle;
 #ifdef POLYOBJECTS_PLANES
 		new_pl->polyobj = pl->polyobj;
+#endif
+#ifdef ESLOPE
+		new_pl->slope = pl->slope;
 #endif
 		pl = new_pl;
 		pl->minx = start;
@@ -814,7 +836,11 @@ void R_DrawSinglePlane(visplane_t *pl)
 		else light = (pl->lightlevel >> LIGHTSEGSHIFT);
 
 #ifndef NOWATER
-		if (pl->ffloor->flags & FF_RIPPLE)
+		if (pl->ffloor->flags & FF_RIPPLE
+#ifdef ESLOPE
+				&& !pl->slope
+#endif
+			)
 		{
 			INT32 top, bottom;
 
@@ -842,6 +868,9 @@ void R_DrawSinglePlane(visplane_t *pl)
 	}
 	else light = (pl->lightlevel >> LIGHTSEGSHIFT);
 
+#ifdef ESLOPE
+	if (!pl->slope) // Don't mess with angle on slopes! We'll handle this ourselves later
+#endif
 	if (viewangle != pl->viewangle)
 	{
 		memset(cachedheight, 0, sizeof (cachedheight));
@@ -915,6 +944,99 @@ void R_DrawSinglePlane(visplane_t *pl)
 	if (light < 0)
 		light = 0;
 
+#ifdef ESLOPE
+	if (pl->slope) {
+		// Potentially override other stuff for now cus we're mean. :< But draw a slope plane!
+		// I copied ZDoom's code and adapted it to SRB2... -Red
+		floatv3_t p, m, n;
+		float ang;
+		float vx, vy, vz;
+		float fudge;
+
+		xoffs &= ((1 << (32-nflatshiftup))-1);
+		yoffs &= ((1 << (32-nflatshiftup))-1);
+
+		xoffs -= (pl->slope->o.x + (1 << (31-nflatshiftup))) & ~((1 << (32-nflatshiftup))-1);
+		yoffs += (pl->slope->o.y + (1 << (31-nflatshiftup))) & ~((1 << (32-nflatshiftup))-1);
+
+		// Okay, look, don't ask me why this works, but without this setup there's a disgusting-looking misalignment with the textures. -Red
+		fudge = ((1<<nflatshiftup)+1.0f)/(1<<nflatshiftup);
+
+		xoffs *= fudge;
+		yoffs /= fudge;
+
+		vx = FIXED_TO_FLOAT(viewx+xoffs);
+		vy = FIXED_TO_FLOAT(viewy-yoffs);
+		vz = FIXED_TO_FLOAT(viewz);
+
+		zeroheight = FIXED_TO_FLOAT(P_GetZAt(pl->slope, viewx, viewy));
+
+#define ANG2RAD(angle) ((float)((angle)*M_PI)/ANGLE_180)
+
+		// p is the texture origin in view space
+		// Don't add in the offsets at this stage, because doing so can result in
+		// errors if the flat is rotated.
+		ang = ANG2RAD(ANGLE_270 - viewangle);
+		p.x = vx * cos(ang) - vy * sin(ang);
+		p.z = vx * sin(ang) + vy * cos(ang);
+		p.y = FIXED_TO_FLOAT(P_GetZAt(pl->slope, -xoffs, yoffs)) - vz;
+
+		// m is the v direction vector in view space
+		ang = ANG2RAD(ANGLE_180 - viewangle - pl->plangle);
+		m.x = cos(ang);
+		m.z = sin(ang);
+
+		// n is the u direction vector in view space
+		n.x = sin(ang);
+		n.z = -cos(ang);
+
+		ang = ANG2RAD(pl->plangle);
+		m.y = FIXED_TO_FLOAT(P_GetZAt(pl->slope, viewx + FLOAT_TO_FIXED(sin(ang)), viewy + FLOAT_TO_FIXED(cos(ang)))) - zeroheight;
+		n.y = FIXED_TO_FLOAT(P_GetZAt(pl->slope, viewx + FLOAT_TO_FIXED(cos(ang)), viewy - FLOAT_TO_FIXED(sin(ang)))) - zeroheight;
+
+		m.x /= fudge;
+		m.y /= fudge;
+		m.z /= fudge;
+
+		n.x *= fudge;
+		n.y *= fudge;
+		n.z *= fudge;
+
+		// Eh. I tried making this stuff fixed-point and it exploded on me. Here's a macro for the only floating-point vector function I recall using.
+#define CROSS(d, v1, v2) \
+   d.x = (v1.y * v2.z) - (v1.z * v2.y);\
+   d.y = (v1.z * v2.x) - (v1.x * v2.z);\
+   d.z = (v1.x * v2.y) - (v1.y * v2.x)
+		CROSS(ds_su, p, m);
+		CROSS(ds_sv, p, n);
+		CROSS(ds_sz, m, n);
+#undef CROSS
+
+		ds_su.z *= focallengthf;
+		ds_sv.z *= focallengthf;
+		ds_sz.z *= focallengthf;
+
+		// Premultiply the texture vectors with the scale factors
+#define SFMULT 65536.f*(1<<nflatshiftup)
+		ds_su.x *= SFMULT;
+		ds_su.y *= SFMULT;
+		ds_su.z *= SFMULT;
+		ds_sv.x *= SFMULT;
+		ds_sv.y *= SFMULT;
+		ds_sv.z *= SFMULT;
+#undef SFMULT
+
+		if (spanfunc == R_DrawTranslucentSpan_8)
+			spanfunc = R_DrawTiltedTranslucentSpan_8;
+		else if (spanfunc == splatfunc)
+			spanfunc = R_DrawTiltedSplat_8;
+		else
+			spanfunc = R_DrawTiltedSpan_8;
+
+		planezlight = scalelight[light];
+	} else
+#endif // ESLOPE
+
 	planezlight = zlight[light];
 
 	// set the maximum value for unsigned

src/r_plane.h

@@ -61,6 +61,9 @@ typedef struct visplane_s
 #ifdef POLYOBJECTS_PLANES
 	polyobj_t *polyobj;
 #endif
+#ifdef ESLOPE
+	pslope_t *slope;
+#endif
 } visplane_t;
 
 extern visplane_t *floorplane;
@@ -79,6 +82,8 @@ extern fixed_t cachedxstep[MAXVIDHEIGHT];
 extern fixed_t cachedystep[MAXVIDHEIGHT];
 extern fixed_t basexscale, baseyscale;
 
+extern lighttable_t **planezlight;
+
 extern fixed_t *yslope;
 extern fixed_t distscale[MAXVIDWIDTH];
 
@@ -91,7 +96,11 @@ void R_MapPlane(INT32 y, INT32 x1, INT32 x2);
 void R_MakeSpans(INT32 x, INT32 t1, INT32 b1, INT32 t2, INT32 b2);
 void R_DrawPlanes(void);
 visplane_t *R_FindPlane(fixed_t height, INT32 picnum, INT32 lightlevel, fixed_t xoff, fixed_t yoff, angle_t plangle,
-	extracolormap_t *planecolormap, ffloor_t *ffloor);
+	extracolormap_t *planecolormap, ffloor_t *ffloor
+#ifdef ESLOPE
+	, pslope_t *slope
+#endif
+	);
 visplane_t *R_CheckPlane(visplane_t *pl, INT32 start, INT32 stop);
 void R_ExpandPlane(visplane_t *pl, INT32 start, INT32 stop);
 void R_PlaneBounds(visplane_t *plane);
@@ -110,6 +119,14 @@ typedef struct planemgr_s
 	INT16 f_clip[MAXVIDWIDTH];
 	INT16 c_clip[MAXVIDWIDTH];
 
+#ifdef ESLOPE
+	// For slope rendering; the height at the other end
+	fixed_t f_pos_slope;
+	fixed_t b_pos_slope;
+
+	struct pslope_s *slope;
+#endif
+
 	struct ffloor_s *ffloor;
 #ifdef POLYOBJECTS_PLANES
 	polyobj_t *polyobj;

src/r_things.c

@@ -950,12 +950,22 @@ static void R_SplitSprite(vissprite_t *sprite, mobj_t *thing)
 
 	for (i = 1; i < sector->numlights; i++)
 	{
-		if (sector->lightlist[i].height >= sprite->gzt || !(sector->lightlist[i].caster->flags & FF_CUTSPRITES))
+		fixed_t testheight = sector->lightlist[i].height;
+
+		if (!(sector->lightlist[i].caster->flags & FF_CUTSPRITES))
 			continue;
-		if (sector->lightlist[i].height <= sprite->gz)
+
+#ifdef ESLOPE
+		if (sector->lightlist[i].slope)
+			testheight = P_GetZAt(sector->lightlist[i].slope, sprite->gx, sprite->gy);
+#endif
+
+		if (testheight >= sprite->gzt)
+			continue;
+		if (testheight <= sprite->gz)
 			return;
 
-		cutfrac = (INT16)((centeryfrac - FixedMul(sector->lightlist[i].height - viewz, sprite->scale))>>FRACBITS);
+		cutfrac = (INT16)((centeryfrac - FixedMul(testheight - viewz, sprite->scale))>>FRACBITS);
 		if (cutfrac < 0)
 			continue;
 		if (cutfrac > vid.height)
@@ -966,15 +976,15 @@ static void R_SplitSprite(vissprite_t *sprite, mobj_t *thing)
 		newsprite = M_Memcpy(R_NewVisSprite(), sprite, sizeof (vissprite_t));
 
 		sprite->cut |= SC_BOTTOM;
-		sprite->gz = sector->lightlist[i].height;
+		sprite->gz = testheight;
 
 		newsprite->gzt = sprite->gz;
 
 		sprite->sz = cutfrac;
 		newsprite->szt = (INT16)(sprite->sz - 1);
 
-		if (sector->lightlist[i].height < sprite->pzt && sector->lightlist[i].height > sprite->pz)
+		if (testheight < sprite->pzt && testheight > sprite->pz)
-			sprite->pz = newsprite->pzt = sector->lightlist[i].height;
+			sprite->pz = newsprite->pzt = testheight;
 		else
 		{
 			newsprite->pz = newsprite->gz;
@@ -1191,7 +1201,20 @@ static void R_ProjectSprite(mobj_t *thing)
 	if (thing->subsector->sector->numlights)
 	{
 		INT32 lightnum;
+#ifdef ESLOPE // R_GetPlaneLight won't work on sloped lights!
+		light = thing->subsector->sector->numlights - 1;
+
+		for (lightnum = 1; lightnum < thing->subsector->sector->numlights; lightnum++) {
+			fixed_t h = thing->subsector->sector->lightlist[lightnum].slope ? P_GetZAt(thing->subsector->sector->lightlist[lightnum].slope, thing->x, thing->y)
+			            : thing->subsector->sector->lightlist[lightnum].height;
+			if (h <= gzt) {
+				light = lightnum - 1;
+				break;
+			}
+		}
+#else
 		light = R_GetPlaneLight(thing->subsector->sector, gzt, false);
+#endif
 		lightnum = (*thing->subsector->sector->lightlist[light].lightlevel >> LIGHTSEGSHIFT);
 
 		if (lightnum < 0)
@@ -1752,24 +1775,34 @@ static void R_CreateDrawNodes(void)
 		{
 			if (r2->plane)
 			{
+				fixed_t planeobjectz, planecameraz;
 				if (r2->plane->minx > rover->x2 || r2->plane->maxx < rover->x1)
 					continue;
 				if (rover->szt > r2->plane->low || rover->sz < r2->plane->high)
 					continue;
 
+#ifdef ESLOPE
+				// Effective height may be different for each comparison in the case of slopes
+				if (r2->plane->slope) {
+					planeobjectz = P_GetZAt(r2->plane->slope, rover->gx, rover->gy);
+					planecameraz = P_GetZAt(r2->plane->slope, viewx, viewy);
+				} else
+#endif
+					planeobjectz = planecameraz = r2->plane->height;
+
 				if (rover->mobjflags & MF_NOCLIPHEIGHT)
 				{
 					//Objects with NOCLIPHEIGHT can appear halfway in.
-					if (r2->plane->height < viewz && rover->pz+(rover->thingheight/2) >= r2->plane->height)
+					if (planecameraz < viewz && rover->pz+(rover->thingheight/2) >= planeobjectz)
 						continue;
-					if (r2->plane->height > viewz && rover->pzt-(rover->thingheight/2) <= r2->plane->height)
+					if (planecameraz > viewz && rover->pzt-(rover->thingheight/2) <= planeobjectz)
 						continue;
 				}
 				else
 				{
-					if (r2->plane->height < viewz && rover->pz >= r2->plane->height)
+					if (planecameraz < viewz && rover->pz >= planeobjectz)
 						continue;
-					if (r2->plane->height > viewz && rover->pzt <= r2->plane->height)
+					if (planecameraz > viewz && rover->pzt <= planeobjectz)
 						continue;
 				}
 
@@ -1799,6 +1832,7 @@ static void R_CreateDrawNodes(void)
 			}
 			else if (r2->thickseg)
 			{
+				fixed_t topplaneobjectz, topplanecameraz, botplaneobjectz, botplanecameraz;
 				if (rover->x1 > r2->thickseg->x2 || rover->x2 < r2->thickseg->x1)
 					continue;
 
@@ -1809,9 +1843,25 @@ static void R_CreateDrawNodes(void)
 				if (scale <= rover->scale)
 					continue;
 
-				if ((*r2->ffloor->topheight > viewz && *r2->ffloor->bottomheight < viewz) ||
+#ifdef ESLOPE
-				    (*r2->ffloor->topheight < viewz && rover->gzt < *r2->ffloor->topheight) ||
+				if (*r2->ffloor->t_slope) {
-				    (*r2->ffloor->bottomheight > viewz && rover->gz > *r2->ffloor->bottomheight))
+					topplaneobjectz = P_GetZAt(*r2->ffloor->t_slope, rover->gx, rover->gy);
+					topplanecameraz = P_GetZAt(*r2->ffloor->t_slope, viewx, viewy);
+				} else
+#endif
+					topplaneobjectz = topplanecameraz = *r2->ffloor->topheight;
+
+#ifdef ESLOPE
+				if (*r2->ffloor->b_slope) {
+					botplaneobjectz = P_GetZAt(*r2->ffloor->b_slope, rover->gx, rover->gy);
+					botplanecameraz = P_GetZAt(*r2->ffloor->b_slope, viewx, viewy);
+				} else
+#endif
+					botplaneobjectz = botplanecameraz = *r2->ffloor->bottomheight;
+
+				if ((topplanecameraz > viewz && botplanecameraz < viewz) ||
+				    (topplanecameraz < viewz && rover->gzt < topplaneobjectz) ||
+				    (botplanecameraz > viewz && rover->gz > botplaneobjectz))
 				{
 					entry = R_CreateDrawNode(NULL);
 					(entry->prev = r2->prev)->next = entry;
@@ -2030,21 +2080,21 @@ void R_ClipSprites(void)
 			if (spr->gzt <= ds->tsilheight)
 				silhouette &= ~SIL_TOP;
 
-			if (silhouette == 1)
+			if (silhouette == SIL_BOTTOM)
 			{
 				// bottom sil
 				for (x = r1; x <= r2; x++)
 					if (spr->clipbot[x] == -2)
 						spr->clipbot[x] = ds->sprbottomclip[x];
 			}
-			else if (silhouette == 2)
+			else if (silhouette == SIL_TOP)
 			{
 				// top sil
 				for (x = r1; x <= r2; x++)
 					if (spr->cliptop[x] == -2)
 						spr->cliptop[x] = ds->sprtopclip[x];
 			}
-			else if (silhouette == 3)
+			else if (silhouette == (SIL_TOP|SIL_BOTTOM))
 			{
 				// both
 				for (x = r1; x <= r2; x++)

src/tables.c

@@ -2225,9 +2225,6 @@ angle_t tantoangle[2049] =
 	536870912
 };
 
-
-#ifdef NEED_FIXED_VECTOR
-
 static angle_t fineacon[65536*2] = {
 	  ANGLE_MAX, 2143707442, 2142143280, 2140943052, 2139931208, 2139039753, 2138233813, 2137492672, 2136802831, 2136154917, 2135542102, 2134959233, 2134402306, 2133868139, 2133354148, 2132858208,
 	 2132378539, 2131913638, 2131462220, 2131023174, 2130595537, 2130178462, 2129771202, 2129373097, 2128983555, 2128602046, 2128228092, 2127861261, 2127501162, 2127147436, 2126799757, 2126457825,
@@ -10706,5 +10703,3 @@ void FM_Rotate(matrix_t *dest, angle_t angle, fixed_t x, fixed_t y, fixed_t z)
 	M(3, 3) = FRACUNIT;
 #undef M
 }
-
-#endif

src/tables.h

@@ -96,9 +96,6 @@ FUNCMATH angle_t FixedAngle(fixed_t fa);
 // and with a factor, with +factor for (fa/factor) and -factor for (fa*factor)
 FUNCMATH angle_t FixedAngleC(fixed_t fa, fixed_t factor);
 
-
-#ifdef NEED_FIXED_VECTOR
-
 /// The FixedAcos function
 FUNCMATH angle_t FixedAcos(fixed_t x);
 
@@ -112,8 +109,6 @@ void FV3_Rotate(vector3_t *rotVec, const vector3_t *axisVec, const angle_t angle
 /// Fixed Point Matrix functions
 void FM_Rotate(matrix_t *dest, angle_t angle, fixed_t x, fixed_t y, fixed_t z);
 
-#endif // defined NEED_FIXED_VECTOR
-
 // The table values in tables.c are calculated with this many fractional bits.
 #define FINE_FRACBITS 16
 

tools/anglechk.c

@@ -351,6 +351,13 @@ int main(int argc, char** argv)
 	return 0;
 }
 
+static void *cpu_cpy(void *dest, const void *src, size_t n)
+{
+	return memcpy(dest, src, n);
+}
+
+void *(*M_Memcpy)(void* dest, const void* src, size_t n) = cpu_cpy;
+
 void I_Error(const char *error, ...)
 {
 	(void)error;