- fixed some issues with P_FindFloorCeiling's coordinate processing.

- added a new compatmode CVAR which allows setting some generic compatibility 
  flag combinations:
  Doom: sets the options needed to make most Doom.exe compatible map play without
  errors.
  Doom (strict): Same as above but sets a few more options. Please note that this
  does not mean full Doom.exe behavior emulation.
  Boom: Sets all options that consider differences between ZDoom and Boom.
  ZDoom 2.0.63: Sets only the COMPATF_SOUNDTARGET option which is needed for
  many older ZDoom maps.
- added new COMPAT_CROSSDROPOFF option to block monsters from being pushed over
  dropoffs by damage kickback.
- fixed: AFastProjectile::Tick must call Effect only 8 times per tic, regardless
  of the amount of steps taken.
- fixed: momentum checks in AFastProjectile did not use absolute values.


SVN r1369 (trunk)

docs/rh-log.txt

@@ -1,3 +1,8 @@
+January 25, 2009  (Changes by Graf Zahl)
+- fixed: AFastProjectile::Tick must call Effect only 8 times per tic, regardless
+  of the amount of steps taken.
+- fixed: momentum checks in AFastProjectile did not use absolute values.
+
 January 24, 2009
 - Restored the rhythm section to fmopl.cpp and made some slight updates from
   version 0.72 of MAME's fmopl.c. Also refactored CalcVoice so that the

src/actor.h

@@ -261,6 +261,7 @@ enum
 	MF4_LOOKALLAROUND	= 0x00010000,	// Monster has eyes in the back of its head
 	MF4_STANDSTILL		= 0x00020000,	// Monster should not chase targets unless attacked?
 	MF4_SPECTRAL		= 0x00040000,
+	MF4_SCROLLMOVE		= 0x00080000,	// momentum has been applied by a scroller
 	MF4_NOSPLASHALERT	= 0x00100000,	// Splashes don't alert this monster
 	MF4_SYNCHRONIZED	= 0x00200000,	// For actors spawned at load-time only: Do not randomize tics
 	MF4_NOTARGETSWITCH	= 0x00400000,	// monster never switches target until current one is dead

src/d_main.cpp

@@ -510,10 +510,50 @@ CVAR (Flag, sv_noautoaim,			dmflags2, DF2_NOAUTOAIM);
 
 int i_compatflags;	// internal compatflags composed from the compatflags CVAR and MAPINFO settings
 
+EXTERN_CVAR(Int, compatmode)
+
+static int GetCompatibility(int mask)
+{
+	if (level.info == NULL) return mask;
+	else return (mask & ~level.info->compatmask) | (level.info->compatflags & level.info->compatmask);
+}
+
 CUSTOM_CVAR (Int, compatflags, 0, CVAR_ARCHIVE|CVAR_SERVERINFO)
 {
-	if (level.info == NULL) i_compatflags = self;
-	else i_compatflags = (self & ~level.info->compatmask) | (level.info->compatflags & level.info->compatmask);
+	i_compatflags = GetCompatibility(self);
+}
+
+CUSTOM_CVAR(Int, compatmode, 0, CVAR_ARCHIVE|CVAR_SERVERINFO)
+{
+	int v;
+
+	switch (self)
+	{
+	default:
+	case 0:
+		v = 0;
+		break;
+
+	case 1:	// Doom2.exe compatible with a few relaxed settings
+		v = COMPATF_SHORTTEX|COMPATF_STAIRINDEX|COMPATF_USEBLOCKING|COMPATF_NODOORLIGHT|
+			COMPATF_TRACE|COMPATF_MISSILECLIP|COMPATF_SOUNDTARGET|COMPATF_DEHHEALTH|COMPATF_CROSSDROPOFF;
+		break;
+
+	case 2:	// same as 1 but stricter (NO_PASSMOBJ and INVISIBILITY are also set)
+		v = COMPATF_SHORTTEX|COMPATF_STAIRINDEX|COMPATF_USEBLOCKING|COMPATF_NODOORLIGHT|
+			COMPATF_TRACE|COMPATF_MISSILECLIP|COMPATF_SOUNDTARGET|COMPATF_NO_PASSMOBJ|COMPATF_LIMITPAIN|
+			COMPATF_DEHHEALTH|COMPATF_INVISIBILITY;
+		break;
+
+	case 3:
+		v = COMPATF_TRACE|COMPATF_SOUNDTARGET|COMPATF_BOOMSCROLL;
+		break;
+
+	case 4:
+		v = COMPATF_SOUNDTARGET;
+		break;
+	}
+	compatflags = v;
 }
 
 CVAR (Flag, compat_shortTex,	compatflags, COMPATF_SHORTTEX);
@@ -536,6 +576,7 @@ CVAR (Flag, compat_invisibility,compatflags, COMPATF_INVISIBILITY);
 CVAR (Flag, compat_silentinstantfloors,compatflags, COMPATF_SILENT_INSTANT_FLOORS);
 CVAR (Flag, compat_sectorsounds,compatflags, COMPATF_SECTORSOUNDS);
 CVAR (Flag, compat_missileclip,	compatflags, COMPATF_MISSILECLIP);
+CVAR (Flag, compat_crossdropoff,compatflags, COMPATF_CROSSDROPOFF);
 
 //==========================================================================
 //

src/doomdef.h

@@ -279,6 +279,7 @@ enum
 	COMPATF_SILENT_INSTANT_FLOORS = 1<<17,	// Instantly moving floors are not silent
 	COMPATF_SECTORSOUNDS	= 1 << 18,	// Sector sounds use original method for sound origin.
 	COMPATF_MISSILECLIP		= 1 << 19,	// Use original Doom heights for clipping against projectiles
+	COMPATF_CROSSDROPOFF	= 1 << 20,	// monsters can't be pushed over dropoffs
 };
 
 // phares 3/20/98:

src/g_shared/a_fastprojectile.cpp

@@ -33,7 +33,7 @@ void AFastProjectile::Tick ()
 	int count = 8;
 	if (radius > 0)
 	{
-		while ( ((momx >> shift) > radius) || ((momy >> shift) > radius))
+		while ( ((abs(momx) >> shift) > radius) || ((abs(momy) >> shift) > radius))
 		{
 			// we need to take smaller steps.
 			shift++;
@@ -56,8 +56,8 @@ void AFastProjectile::Tick ()
 				if (--ripcount <= 0)
 				{
 					tm.LastRipped = NULL;	// [RH] Do rip damage each step, like Hexen
-					ripcount = count >> 3;
 				}
+				
 				if (!P_TryMove (this, x + xfrac,y + yfrac, true, false, tm))
 				{ // Blocked move
 					P_ExplodeMissile (this, BlockingLine, BlockingMobj);
@@ -78,7 +78,11 @@ void AFastProjectile::Tick ()
 				P_ExplodeMissile (this, NULL, NULL);
 				return;
 			}
-			if (changexy) Effect();
+			if (changexy && ripcount <= 0) 
+			{
+				ripcount = count >> 3;
+				Effect();
+			}
 		}
 	}
 	// Advance the state

src/m_options.cpp

@@ -86,6 +86,7 @@
 EXTERN_CVAR(Bool, nomonsterinterpolation)
 EXTERN_CVAR(Int, showendoom)
 EXTERN_CVAR(Bool, hud_althud)
+EXTERN_CVAR(Int, compatmode)
 //
 // defaulted values
 //
@@ -140,6 +141,14 @@ value_t OffOn[2] = {
 	{ 1.0, "Off" }
 };
 
+value_t CompatModes[5] = {
+	{ 0.0, "Default" },
+	{ 1.0, "Doom" },
+	{ 2.0, "Doom (strict)" },
+	{ 3.0, "Boom" },
+	{ 4.0, "ZDoom 2.0.63" }
+};
+
 menu_t  *CurrentMenu;
 int		CurrentItem;
 static const char	*OldMessage;
@@ -1092,6 +1101,8 @@ static menu_t DMFlagsMenu =
  *=======================================*/
 
 static menuitem_t CompatibilityItems[] = {
+	{ discrete, "Compatibility mode",						{&compatmode},	{5.0}, {0.0},	{0.0}, {CompatModes} },
+	{ redtext,	" ",					{NULL},			{0.0}, {0.0}, {0.0}, {NULL} },
 	{ bitflag,	"Find shortest textures like Doom",			{&compatflags}, {0}, {0}, {0}, {(value_t *)COMPATF_SHORTTEX} },
 	{ bitflag,	"Use buggier stair building",				{&compatflags}, {0}, {0}, {0}, {(value_t *)COMPATF_STAIRINDEX} },
 	{ bitflag,	"Limit Pain Elementals' Lost Souls",		{&compatflags}, {0}, {0}, {0}, {(value_t *)COMPATF_LIMITPAIN} },
@@ -1107,6 +1118,7 @@ static menuitem_t CompatibilityItems[] = {
 	{ bitflag,	"DEH health settings like Doom2.exe",		{&compatflags}, {0}, {0}, {0}, {(value_t *)COMPATF_DEHHEALTH} },
 	{ bitflag,	"Self ref. sectors don't block shots",		{&compatflags}, {0}, {0}, {0}, {(value_t *)COMPATF_TRACE} },
 	{ bitflag,	"Monsters get stuck over dropoffs",			{&compatflags}, {0}, {0}, {0}, {(value_t *)COMPATF_DROPOFF} },
+	{ bitflag,	"Monsters cannot cross dropoffs",			{&compatflags}, {0}, {0}, {0}, {(value_t *)COMPATF_CROSSDROPOFF} },
 	{ bitflag,	"Monsters see invisible players",			{&compatflags}, {0}, {0}, {0}, {(value_t *)COMPATF_INVISIBILITY} },
 	{ bitflag,	"Boom scrollers are additive",				{&compatflags}, {0}, {0}, {0}, {(value_t *)COMPATF_BOOMSCROLL} },
 	{ bitflag,	"Inst. moving floors are not silent",		{&compatflags}, {0}, {0}, {0}, {(value_t *)COMPATF_SILENT_INSTANT_FLOORS} },

src/p_map.cpp

@@ -160,6 +160,45 @@ static bool PIT_FindFloorCeiling (line_t *ld, const FBoundingBox &box, FCheckPos
 	return true;
 }
 
+
+void P_GetFloorCeilingZ(FCheckPosition &tmf)
+{
+	sector_t *sec = P_PointInSector (tmf.x, tmf.y);
+	tmf.floorsector = sec;
+	tmf.ceilingsector = sec;
+
+	tmf.floorz = tmf.dropoffz = sec->floorplane.ZatPoint (tmf.x, tmf.y);
+	tmf.ceilingz = sec->ceilingplane.ZatPoint (tmf.x, tmf.y);
+	tmf.floorpic = sec->GetTexture(sector_t::floor);
+	tmf.ceilingpic = sec->GetTexture(sector_t::ceiling);
+
+#ifdef _3DFLOORS
+	for(unsigned int i=0;i<sec->e->XFloor.ffloors.Size();i++)
+	{
+		F3DFloor*  rover = sec->e->XFloor.ffloors[i];
+
+		if (!(rover->flags & FF_SOLID) || !(rover->flags & FF_EXISTS)) continue;
+
+		fixed_t ff_bottom = rover->bottom.plane->ZatPoint(tmf.x, tmf.y);
+		fixed_t ff_top = rover->top.plane->ZatPoint(tmf.x, tmf.y);
+
+		if (ff_top > tmf.floorz)
+		{
+			if (ff_top < tmf.z || (tmf.thing != NULL && ff_bottom < tmf.z && ff_top < tmf.z + tmf.thing->MaxStepHeight))  
+			{
+				tmf.dropoffz = tmf.floorz = ff_top;
+				tmf.floorpic = *rover->top.texture;
+			}
+		}
+		if (ff_bottom < tmf.ceilingz && ff_bottom > tmf.z + tmf.thing->height) 
+		{
+			tmf.ceilingz = ff_bottom;
+			tmf.ceilingpic = *rover->bottom.texture;
+		}
+	}
+#endif
+}
+
 //==========================================================================
 //
 // P_FindFloorCeiling
@@ -168,22 +207,24 @@ static bool PIT_FindFloorCeiling (line_t *ld, const FBoundingBox &box, FCheckPos
 
 void P_FindFloorCeiling (AActor *actor, bool onlyspawnpos)
 {
-	sector_t *sec;
 	FCheckPosition tmf;
 
+	tmf.thing = actor;
 	tmf.x = actor->x;
 	tmf.y = actor->y;
+	tmf.z = actor->z;
+	P_GetFloorCeilingZ(tmf);
+
+	actor->floorz = tmf.floorz;
+	actor->dropoffz = tmf.dropoffz;
+	actor->ceilingz = tmf.ceilingz;
+	actor->floorpic = tmf.floorpic;
+	actor->floorsector = tmf.floorsector;
+	actor->ceilingpic = tmf.ceilingpic;
+	actor->ceilingsector = tmf.ceilingsector;
 
 	FBoundingBox box(tmf.x, tmf.y, actor->radius);
 
-	sec = P_PointInSector (tmf.x, tmf.y);
-	tmf.thing = actor;
-	tmf.floorz = tmf.dropoffz = sec->floorplane.ZatPoint (tmf.x, tmf.y);
-	tmf.ceilingz = sec->ceilingplane.ZatPoint (tmf.x, tmf.y);
-	tmf.floorpic = sec->GetTexture(sector_t::floor);
-	tmf.floorsector = sec;
-	tmf.ceilingpic = sec->GetTexture(sector_t::ceiling);
-	tmf.ceilingsector = sec;
 	tmf.touchmidtex = false;
 	validcount++;
 
@@ -207,25 +248,6 @@ void P_FindFloorCeiling (AActor *actor, bool onlyspawnpos)
 		actor->ceilingpic = tmf.ceilingpic;
 		actor->ceilingsector = tmf.ceilingsector;
 	}
-
-#ifdef _3DFLOORS
-	// also check 3D floors at the spawn position if the result from the block lines iterator cannot be used.
-	if (onlyspawnpos)
-	{
-		for(unsigned int i=0;i<actor->Sector->e->XFloor.ffloors.Size();i++)
-		{
-			F3DFloor*  rover=actor->Sector->e->XFloor.ffloors[i];
-
-			if (!(rover->flags & FF_SOLID) || !(rover->flags & FF_EXISTS)) continue;
-
-			fixed_t ff_bottom=rover->bottom.plane->ZatPoint(actor->x, actor->y);
-			fixed_t ff_top=rover->top.plane->ZatPoint(actor->x, actor->y);
-
-			if (ff_top > actor->floorz && ff_top < actor->z) actor->floorz = ff_top;
-			if (ff_bottom < actor->ceilingz && ff_bottom > actor->z + actor->height) actor->ceilingz = ff_bottom;
-		}
-	}
-#endif
 }
 
 //
@@ -244,11 +266,9 @@ void P_FindFloorCeiling (AActor *actor, bool onlyspawnpos)
 bool P_TeleportMove (AActor *thing, fixed_t x, fixed_t y, fixed_t z, bool telefrag)
 {
 	FCheckPosition tmf;
-	sector_t*		newsec;
 	
 	// kill anything occupying the position
 		
-	newsec = P_PointInSector (x,y);
 	
 	// The base floor/ceiling is from the subsector that contains the point.
 	// Any contacted lines the step closer together will adjust them.
@@ -256,12 +276,7 @@ bool P_TeleportMove (AActor *thing, fixed_t x, fixed_t y, fixed_t z, bool telefr
 	tmf.x = x;
 	tmf.y = y;
 	tmf.z = z;
-	tmf.floorz = tmf.dropoffz = newsec->floorplane.ZatPoint (x, y);
-	tmf.ceilingz = newsec->ceilingplane.ZatPoint (x, y);
-	tmf.floorpic = newsec->GetTexture(sector_t::floor);
-	tmf.floorsector = newsec;
-	tmf.ceilingpic = newsec->GetTexture(sector_t::ceiling);
-	tmf.ceilingsector = newsec;
+	P_GetFloorCeilingZ(tmf);
 					
 	spechit.Clear ();
 
@@ -1540,6 +1555,13 @@ bool P_TryMove (AActor *thing, fixed_t x, fixed_t y,
 			}
 		}
 
+		// compatibility check: Doom originally did not allow monsters to cross dropoffs at all.
+		// If the compatibility flag is on, only allow this when the momentum comes from a scroller
+		if ((i_compatflags & COMPATF_CROSSDROPOFF) && !(thing->flags4 & MF4_SCROLLMOVE))
+		{
+			dropoff = false;
+		}
+
 		// killough 3/15/98: Allow certain objects to drop off
 		if ((!dropoff && !(thing->flags & (MF_DROPOFF|MF_FLOAT|MF_MISSILE))) || (thing->flags5&MF5_NODROPOFF))
 		{

src/p_mobj.cpp

@@ -1396,15 +1396,18 @@ void P_XYMovement (AActor *mo, fixed_t scrollx, fixed_t scrolly)
 	// because BOOM relied on the speed being fast enough to accumulate
 	// despite friction. If the speed is too low, then its movement will get
 	// cancelled, and it won't accumulate to the desired speed.
+	mo->flags4 &= ~MF4_SCROLLMOVE;
 	if (abs(scrollx) > CARRYSTOPSPEED)
 	{
 		scrollx = FixedMul (scrollx, CARRYFACTOR);
 		mo->momx += scrollx;
+		mo->flags4 |= MF4_SCROLLMOVE;
 	}
 	if (abs(scrolly) > CARRYSTOPSPEED)
 	{
 		scrolly = FixedMul (scrolly, CARRYFACTOR);
 		mo->momy += scrolly;
+		mo->flags4 |= MF4_SCROLLMOVE;
 	}
 	xmove += scrollx;
 	ymove += scrolly;
@@ -1781,6 +1784,7 @@ explode:
 		}
 
 		mo->momx = mo->momy = 0;
+		mo->flags4 &= ~MF4_SCROLLMOVE;
 
 		// killough 10/98: kill any bobbing momentum too (except in voodoo dolls)
 		if (player && player->mo == mo)
@@ -3234,15 +3238,21 @@ AActor *AActor::StaticSpawn (const PClass *type, fixed_t ix, fixed_t iy, fixed_t
 	}
 
 	if (SpawningMapThing || !type->IsDescendantOf (RUNTIME_CLASS(APlayerPawn)))
+	{
+		// Check if there's something solid to stand on between the current position and the
+		// current sector's floor. For map spawns this must be delayed until after setting the
+		// z-coordinate.
+		if (!SpawningMapThing) 
+		{
+			P_FindFloorCeiling(actor, true);
+		}
+		else
 		{
 			actor->floorsector = actor->Sector;
 			actor->floorpic = actor->floorsector->GetTexture(sector_t::floor);
 			actor->ceilingsector = actor->Sector;
 			actor->ceilingpic = actor->ceilingsector->GetTexture(sector_t::ceiling);
-		// Check if there's something solid to stand on between the current position and the
-		// current sector's floor. For map spawns this must be delayed until after setting the
-		// z-coordinate.
-		if (!SpawningMapThing) P_FindFloorCeiling(actor, true);
+		}
 	}
 	else if (!(actor->flags5 & MF5_NOINTERACTION))
 	{