Merge branch 'walllight' into 'next'

Wall lighting

See merge request STJr/SRB2!2484

doc/specs/udmf_srb2.txt

@@ -1,5 +1,5 @@
 ===============================================================================
-Universal Doom Map Format Sonic Robo Blast 2 extensions v1.0 19.02.2024
+Universal Doom Map Format Sonic Robo Blast 2 extensions v1.0 19.06.2024
 
     Copyright (c) 2024 Sonic Team Junior
        uses Universal Doom Map Format Specification v1.1 as a template,
@@ -143,6 +143,9 @@ Sonic Robo Blast 2 defines the following standardized fields:
       offsetx_bottom = <float>;        // X offset for lower texture. Default = 0.0.
       offsety_bottom = <float>;        // Y offset for lower texture. Default = 0.0.
 
+      light = <integer>;               // Light level, relative to 'sector' light level. Default = 0.
+      lightabsolute = <bool>;          // true = 'light' is an absolute value, ignoring 'sector' light level.
+
       comment = <string>; // A comment. Implementors should attach no special
                           // semantic meaning to this field.
    }

extras/conf/udb/Includes/SRB222_common.cfg

@@ -115,7 +115,7 @@ mapformat_udmf
 
 	// Enables setting distinct brightness for floor, ceiling, and walls
 	distinctfloorandceilingbrightness = true;
-	distinctwallbrightness = false;
+	distinctwallbrightness = true;
 
 	// Enables setting distinct brightness for upper, middle, and lower sidedef parts
 	distinctsidedefpartbrightness = false;

extras/conf/udb/Includes/SRB222_misc.cfg

@@ -280,18 +280,18 @@ universalfields
 			default = "";
 		}
 		
-		//light
+		light
-		//{
+		{
-		//	type = 0;
+			type = 0;
-		//	default = 0;
+			default = 0;
-		//}
+		}
-		//
+		
-		//lightabsolute
+		lightabsolute
-		//{
+		{
-		//	type = 3;
+			type = 3;
-		//	default = false;
+			default = false;
-		//}
+		}
-		//
+		
 		//light_top
 		//{
 		//	type = 0;

src/hardware/hw_main.c

@@ -309,6 +309,32 @@ static FUINT HWR_CalcSlopeLight(FUINT lightnum, angle_t dir, fixed_t delta)
 	return (FUINT)finallight;
 }
 
+static FUINT HWR_SideLightLevel(side_t *side, UINT8 base_lightlevel)
+{
+	return side->light +
+		((side->lightabsolute) ? 0 : base_lightlevel);
+}
+
+/* TODO: implement per-texture lighting
+static FUINT HWR_TopLightLevel(side_t *side, UINT8 base_lightlevel)
+{
+	return side->light_top +
+		((side->lightabsolute_top) ? 0 : HWR_SideLightLevel(side, base_lightlevel));
+}
+
+static FUINT HWR_MidLightLevel(side_t *side, UINT8 base_lightlevel)
+{
+	return side->light_mid +
+		((side->lightabsolute_mid) ? 0 : HWR_SideLightLevel(side, base_lightlevel));
+}
+
+static FUINT HWR_BottomLightLevel(side_t *side, UINT8 base_lightlevel)
+{
+	return side->light_bottom +
+		((side->lightabsolute_bottom) ? 0 : HWR_SideLightLevel(side, base_lightlevel));
+}
+*/
+
 // ==========================================================================
 //                                   FLOOR/CEILING GENERATION FROM SUBSECTORS
 // ==========================================================================
@@ -705,8 +731,9 @@ static void HWR_SplitWall(sector_t *sector, FOutVector *wallVerts, INT32 texnum,
 	fixed_t v2x = FloatToFixed(wallVerts[1].x);
 	fixed_t v2y = FloatToFixed(wallVerts[1].z);
 
+	FUINT lightnum = HWR_SideLightLevel(gl_sidedef, sector->lightlevel);
 	const UINT8 alpha = Surf->PolyColor.s.alpha;
-	FUINT lightnum = HWR_CalcWallLight(sector->lightlevel, v1x, v1y, v2x, v2y);
+	lightnum = HWR_CalcWallLight(lightnum, v1x, v1y, v2x, v2y);
 	extracolormap_t *colormap = NULL;
 
 	if (!r_renderwalls)
@@ -750,13 +777,13 @@ static void HWR_SplitWall(sector_t *sector, FOutVector *wallVerts, INT32 texnum,
 		{
 			if (pfloor && (pfloor->fofflags & FOF_FOG))
 			{
-				lightnum = pfloor->master->frontsector->lightlevel;
+				lightnum = HWR_SideLightLevel(gl_sidedef, pfloor->master->frontsector->lightlevel);
 				colormap = pfloor->master->frontsector->extra_colormap;
 				lightnum = colormap ? lightnum : HWR_CalcWallLight(lightnum, v1x, v1y, v2x, v2y);
 			}
 			else
 			{
-				lightnum = *list[i].lightlevel;
+				lightnum = HWR_SideLightLevel(gl_sidedef, *list[i].lightlevel);
 				colormap = *list[i].extra_colormap;
 				lightnum = colormap ? lightnum : HWR_CalcWallLight(lightnum, v1x, v1y, v2x, v2y);
 			}
@@ -1167,7 +1194,7 @@ static void HWR_ProcessSeg(void)
 	float cliplow = (float)gl_curline->offset;
 	float cliphigh = cliplow + (gl_curline->flength * FRACUNIT);
 
-	FUINT lightnum = gl_frontsector->lightlevel;
+	FUINT lightnum = HWR_SideLightLevel(gl_sidedef, gl_frontsector->lightlevel);
 	extracolormap_t *colormap = gl_frontsector->extra_colormap;
 	lightnum = colormap ? lightnum : HWR_CalcWallLight(lightnum, vs.x, vs.y, ve.x, ve.y);
 
@@ -1628,11 +1655,11 @@ static void HWR_ProcessSeg(void)
 				{
 					blendmode = PF_Fog|PF_NoTexture;
 
-					lightnum = rover->master->frontsector->lightlevel;
+					lightnum = HWR_SideLightLevel(gl_sidedef, rover->master->frontsector->lightlevel);
 					colormap = rover->master->frontsector->extra_colormap;
 					lightnum = colormap ? lightnum : HWR_CalcWallLight(lightnum, vs.x, vs.y, ve.x, ve.y);
 
-					Surf.PolyColor.s.alpha = HWR_FogBlockAlpha(rover->master->frontsector->lightlevel, rover->master->frontsector->extra_colormap);
+					Surf.PolyColor.s.alpha = HWR_FogBlockAlpha(HWR_SideLightLevel(gl_sidedef, rover->master->frontsector->lightlevel), rover->master->frontsector->extra_colormap);
 
 					if (gl_frontsector->numlights)
 						HWR_SplitWall(gl_frontsector, wallVerts, 0, &Surf, rover->fofflags, rover, blendmode);
@@ -1785,7 +1812,7 @@ static void HWR_ProcessSeg(void)
 				{
 					blendmode = PF_Fog|PF_NoTexture;
 
-					lightnum = rover->master->frontsector->lightlevel;
+					lightnum = HWR_SideLightLevel(gl_sidedef, rover->master->frontsector->lightlevel);
 					colormap = rover->master->frontsector->extra_colormap;
 					lightnum = colormap ? lightnum : HWR_CalcWallLight(lightnum, vs.x, vs.y, ve.x, ve.y);
 

src/lua_maplib.c

@@ -213,6 +213,14 @@ enum side_e {
 	side_sector,
 	side_special,
 	side_repeatcnt,
+	side_light,
+	side_light_top,
+	side_light_mid,
+	side_light_bottom,
+	side_lightabsolute,
+	side_lightabsolute_top,
+	side_lightabsolute_mid,
+	side_lightabsolute_bottom,
 	side_text
 };
 
@@ -241,6 +249,14 @@ static const char *const side_opt[] = {
 	"sector",
 	"special",
 	"repeatcnt",
+	"light",
+	"light_top",
+	"light_mid",
+	"light_bottom",
+	"lightabsolute",
+	"lightabsolute_top",
+	"lightabsolute_mid",
+	"lightabsolute_bottom",
 	"text",
 	NULL};
 
@@ -1311,6 +1327,30 @@ static int side_get(lua_State *L)
 	case side_repeatcnt:
 		lua_pushinteger(L, side->repeatcnt);
 		return 1;
+	case side_light:
+		lua_pushinteger(L, side->light);
+		return 1;
+	case side_light_top:
+		lua_pushinteger(L, side->light_top);
+		return 1;
+	case side_light_mid:
+		lua_pushinteger(L, side->light_mid);
+		return 1;
+	case side_light_bottom:
+		lua_pushinteger(L, side->light_bottom);
+		return 1;
+	case side_lightabsolute:
+		lua_pushboolean(L, side->lightabsolute);
+		return 1;
+	case side_lightabsolute_top:
+		lua_pushboolean(L, side->lightabsolute_top);
+		return 1;
+	case side_lightabsolute_mid:
+		lua_pushboolean(L, side->lightabsolute_mid);
+		return 1;
+	case side_lightabsolute_bottom:
+		lua_pushboolean(L, side->lightabsolute_bottom);
+		return 1;
 	// TODO: 2.3: Delete
 	case side_text:
 		{
@@ -1413,6 +1453,30 @@ static int side_set(lua_State *L)
 	case side_repeatcnt:
 		side->repeatcnt = luaL_checkinteger(L, 3);
 		break;
+	case side_light:
+		side->light = luaL_checkinteger(L, 3);
+		break;
+	case side_light_top:
+		side->light_top = luaL_checkinteger(L, 3);
+		break;
+	case side_light_mid:
+		side->light_mid = luaL_checkinteger(L, 3);
+		break;
+	case side_light_bottom:
+		side->light_bottom = luaL_checkinteger(L, 3);
+		break;
+	case side_lightabsolute:
+		side->lightabsolute = luaL_checkboolean(L, 3);
+		break;
+	case side_lightabsolute_top:
+		side->lightabsolute_top = luaL_checkboolean(L, 3);
+		break;
+	case side_lightabsolute_mid:
+		side->lightabsolute_mid = luaL_checkboolean(L, 3);
+		break;
+	case side_lightabsolute_bottom:
+		side->lightabsolute_bottom = luaL_checkboolean(L, 3);
+		break;
 	}
 	return 0;
 }

src/p_saveg.c

@@ -919,7 +919,11 @@ enum
 	LD_SDMIDLIGHT    = 1<<19,
 	LD_SDBOTLIGHT    = 1<<20,
 	LD_SDREPEATCNT   = 1<<21,
-	LD_SDFLAGS       = 1<<22
+	LD_SDFLAGS       = 1<<22,
+	LD_SDLIGHTABS    = 1<<23,
+	LD_SDTOPLIGHTABS = 1<<24,
+	LD_SDMIDLIGHTABS = 1<<25,
+	LD_SDBOTLIGHTABS = 1<<26
 };
 
 static boolean P_AreArgsEqual(const line_t *li, const line_t *spawnli)
@@ -1393,6 +1397,22 @@ static UINT32 GetSideDiff(const side_t *si, const side_t *spawnsi)
 		diff |= LD_SDBOTSCALEY;
 	if (si->repeatcnt != spawnsi->repeatcnt)
 		diff |= LD_SDREPEATCNT;
+	if (si->light != spawnsi->light)
+		diff |= LD_SDLIGHT;
+	if (si->light_top != spawnsi->light_top)
+		diff |= LD_SDTOPLIGHT;
+	if (si->light_mid != spawnsi->light_mid)
+		diff |= LD_SDMIDLIGHT;
+	if (si->light_bottom != spawnsi->light_bottom)
+		diff |= LD_SDBOTLIGHT;
+	if (si->lightabsolute != spawnsi->lightabsolute)
+		diff |= LD_SDLIGHTABS;
+	if (si->lightabsolute_top != spawnsi->lightabsolute_top)
+		diff |= LD_SDTOPLIGHTABS;
+	if (si->lightabsolute_mid != spawnsi->lightabsolute_mid)
+		diff |= LD_SDMIDLIGHTABS;
+	if (si->lightabsolute_bottom != spawnsi->lightabsolute_bottom)
+		diff |= LD_SDBOTLIGHTABS;
 	return diff;
 }
 
@@ -1436,6 +1456,22 @@ static void ArchiveSide(const side_t *si, UINT32 diff)
 		WRITEFIXED(save_p, si->scaley_bottom);
 	if (diff & LD_SDREPEATCNT)
 		WRITEINT16(save_p, si->repeatcnt);
+	if (diff & LD_SDLIGHT)
+		WRITEINT16(save_p, si->light);
+	if (diff & LD_SDTOPLIGHT)
+		WRITEINT16(save_p, si->light_top);
+	if (diff & LD_SDMIDLIGHT)
+		WRITEINT16(save_p, si->light_mid);
+	if (diff & LD_SDBOTLIGHT)
+		WRITEINT16(save_p, si->light_bottom);
+	if (diff & LD_SDLIGHTABS)
+		WRITEUINT8(save_p, si->lightabsolute);
+	if (diff & LD_SDTOPLIGHTABS)
+		WRITEUINT8(save_p, si->lightabsolute_top);
+	if (diff & LD_SDMIDLIGHTABS)
+		WRITEUINT8(save_p, si->lightabsolute_mid);
+	if (diff & LD_SDBOTLIGHTABS)
+		WRITEUINT8(save_p, si->lightabsolute_bottom);
 }
 
 static void ArchiveLines(void)
@@ -1576,6 +1612,22 @@ static void UnArchiveSide(side_t *si)
 		si->scaley_bottom = READFIXED(save_p);
 	if (diff & LD_SDREPEATCNT)
 		si->repeatcnt = READINT16(save_p);
+	if (diff & LD_SDLIGHT)
+		si->light = READINT16(save_p);
+	if (diff & LD_SDTOPLIGHT)
+		si->light_top = READINT16(save_p);
+	if (diff & LD_SDMIDLIGHT)
+		si->light_mid = READINT16(save_p);
+	if (diff & LD_SDBOTLIGHT)
+		si->light_bottom = READINT16(save_p);
+	if (diff & LD_SDLIGHTABS)
+		si->lightabsolute = READUINT8(save_p);
+	if (diff & LD_SDTOPLIGHTABS)
+		si->lightabsolute_top = READUINT8(save_p);
+	if (diff & LD_SDMIDLIGHTABS)
+		si->lightabsolute_mid = READUINT8(save_p);
+	if (diff & LD_SDBOTLIGHTABS)
+		si->lightabsolute_bottom = READUINT8(save_p);
 }
 
 static void UnArchiveLines(void)

src/p_setup.c

@@ -1367,6 +1367,9 @@ static void P_LoadSidedefs(UINT8 *data)
 		sd->scalex_top = sd->scalex_mid = sd->scalex_bottom = FRACUNIT;
 		sd->scaley_top = sd->scaley_mid = sd->scaley_bottom = FRACUNIT;
 
+		sd->light = sd->light_top = sd->light_mid = sd->light_bottom = 0;
+		sd->lightabsolute = sd->lightabsolute_top = sd->lightabsolute_mid = sd->lightabsolute_bottom = false;
+
 		P_SetSidedefSector(i, (UINT16)SHORT(msd->sector));
 
 		// Special info stored in texture fields!
@@ -1977,6 +1980,22 @@ static void ParseTextmapSidedefParameter(UINT32 i, const char *param, const char
 		P_SetSidedefSector(i, atol(val));
 	else if (fastcmp(param, "repeatcnt"))
 		sides[i].repeatcnt = atol(val);
+	else if (fastcmp(param, "light"))
+		sides[i].light = atol(val);
+	else if (fastcmp(param, "light_top"))
+		sides[i].light_top = atol(val);
+	else if (fastcmp(param, "light_mid"))
+		sides[i].light_mid = atol(val);
+	else if (fastcmp(param, "light_bottom"))
+		sides[i].light_bottom = atol(val);
+	else if (fastcmp(param, "lightabsolute") && fastcmp("true", val))
+		sides[i].lightabsolute = true;
+	else if (fastcmp(param, "lightabsolute_top") && fastcmp("true", val))
+		sides[i].lightabsolute_top = true;
+	else if (fastcmp(param, "lightabsolute_mid") && fastcmp("true", val))
+		sides[i].lightabsolute_mid = true;
+	else if (fastcmp(param, "lightabsolute_bottom") && fastcmp("true", val))
+		sides[i].lightabsolute_bottom = true;
 }
 
 static void ParseTextmapLinedefParameter(UINT32 i, const char *param, const char *val)
@@ -2704,6 +2723,22 @@ static void P_WriteTextmap(void)
 			fprintf(f, "texturemiddle = \"%.*s\";\n", 8, textures[wsides[i].midtexture]->name);
 		if (wsides[i].repeatcnt != 0)
 			fprintf(f, "repeatcnt = %d;\n", wsides[i].repeatcnt);
+		if (wsides[i].light != 0)
+			fprintf(f, "light = %d;\n", wsides[i].light);
+		if (wsides[i].light_top != 0)
+			fprintf(f, "light_top = %d;\n", wsides[i].light_top);
+		if (wsides[i].light_mid != 0)
+			fprintf(f, "light_mid = %d;\n", wsides[i].light_mid);
+		if (wsides[i].light_bottom != 0)
+			fprintf(f, "light_bottom = %d;\n", wsides[i].light_bottom);
+		if (wsides[i].lightabsolute)
+			fprintf(f, "lightabsolute = true;\n");
+		if (wsides[i].lightabsolute_top)
+			fprintf(f, "lightabsolute_top = true;\n");
+		if (wsides[i].lightabsolute_mid)
+			fprintf(f, "lightabsolute_mid = true;\n");
+		if (wsides[i].lightabsolute_bottom)
+			fprintf(f, "lightabsolute_bottom = true;\n");
 		fprintf(f, "}\n");
 		fprintf(f, "\n");
 	}
@@ -3106,6 +3141,8 @@ static void P_LoadTextmap(void)
 		sd->bottomtexture = R_TextureNumForName("-");
 		sd->sector = NULL;
 		sd->repeatcnt = 0;
+		sd->light = sd->light_top = sd->light_mid = sd->light_bottom = 0;
+		sd->lightabsolute = sd->lightabsolute_top = sd->lightabsolute_mid = sd->lightabsolute_bottom = false;
 
 		TextmapParse(sidedefBlocks.pos[i], i, ParseTextmapSidedefParameter);
 

src/r_defs.h

@@ -633,6 +633,11 @@ typedef struct
 	fixed_t scalex_top, scalex_mid, scalex_bottom;
 	fixed_t scaley_top, scaley_mid, scaley_bottom;
 
+	// per-wall lighting for UDMF
+	// TODO: implement per-texture lighting
+	INT16 light, light_top, light_mid, light_bottom;
+	boolean lightabsolute, lightabsolute_top, lightabsolute_mid, lightabsolute_bottom;
+
 	// Texture indices.
 	// We do not maintain names here.
 	INT32 toptexture, bottomtexture, midtexture;

src/r_segs.c

@@ -94,6 +94,32 @@ transnum_t R_GetLinedefTransTable(fixed_t alpha)
 	return (20*(FRACUNIT - alpha - 1) + FRACUNIT) >> (FRACBITS+1);
 }
 
+static INT16 R_SideLightLevel(side_t *side, UINT8 base_lightlevel)
+{
+	return side->light +
+		((side->lightabsolute) ? 0 : base_lightlevel);
+}
+
+/* TODO: implement per-texture lighting
+static INT16 R_TopLightLevel(side_t *side, UINT8 base_lightlevel)
+{
+	return side->light_top +
+		((side->lightabsolute_top) ? 0 : R_SideLightLevel(side, base_lightlevel));
+}
+
+static INT16 R_MidLightLevel(side_t *side, UINT8 base_lightlevel)
+{
+	return side->light_mid +
+		((side->lightabsolute_mid) ? 0 : R_SideLightLevel(side, base_lightlevel));
+}
+
+static INT16 R_BottomLightLevel(side_t *side, UINT8 base_lightlevel)
+{
+	return side->light_bottom +
+		((side->lightabsolute_bottom) ? 0 : R_SideLightLevel(side, base_lightlevel));
+}
+*/
+
 // If we have a multi-patch texture on a 2sided wall (rare) then we draw
 //  it using R_DrawColumn, else we draw it using R_DrawMaskedColumn, this
 //  way we don't have to store extra post_t info with each column for
@@ -324,7 +350,7 @@ void R_RenderMaskedSegRange(drawseg_t *ds, INT32 x1, INT32 x2)
 			if ((colfunc != colfuncs[COLDRAWFUNC_FUZZY])
 				|| (rlight->flags & FOF_FOG)
 				|| (rlight->extra_colormap && (rlight->extra_colormap->flags & CMF_FOG)))
-				lightnum = (rlight->lightlevel >> LIGHTSEGSHIFT);
+				lightnum = R_SideLightLevel(curline->sidedef, rlight->lightlevel) >> LIGHTSEGSHIFT;
 			else
 				lightnum = LIGHTLEVELS - 1;
 
@@ -342,7 +368,7 @@ void R_RenderMaskedSegRange(drawseg_t *ds, INT32 x1, INT32 x2)
 	{
 		if ((colfunc != colfuncs[COLDRAWFUNC_FUZZY])
 			|| (frontsector->extra_colormap && (frontsector->extra_colormap->flags & CMF_FOG)))
-			lightnum = (frontsector->lightlevel >> LIGHTSEGSHIFT);
+			lightnum = R_SideLightLevel(curline->sidedef, frontsector->lightlevel) >> LIGHTSEGSHIFT;
 		else
 			lightnum = LIGHTLEVELS - 1;
 
@@ -798,9 +824,9 @@ void R_RenderThickSideRange(drawseg_t *ds, INT32 x1, INT32 x2, ffloor_t *pfloor)
 
 			// Check if the current light effects the colormap/lightlevel
 			if (pfloor->fofflags & FOF_FOG)
-				rlight->lightnum = (pfloor->master->frontsector->lightlevel >> LIGHTSEGSHIFT);
+				rlight->lightnum = R_SideLightLevel(curline->sidedef, pfloor->master->frontsector->lightlevel) >> LIGHTSEGSHIFT;
 			else
-				rlight->lightnum = (rlight->lightlevel >> LIGHTSEGSHIFT);
+				rlight->lightnum = R_SideLightLevel(curline->sidedef, rlight->lightlevel) >> LIGHTSEGSHIFT;
 
 			if (pfloor->fofflags & FOF_FOG || rlight->flags & FOF_FOG || (rlight->extra_colormap && (rlight->extra_colormap->flags & CMF_FOG)))
 				;
@@ -818,14 +844,13 @@ void R_RenderThickSideRange(drawseg_t *ds, INT32 x1, INT32 x2, ffloor_t *pfloor)
 	{
 		// Get correct light level!
 		if ((frontsector->extra_colormap && (frontsector->extra_colormap->flags & CMF_FOG)))
-			lightnum = (frontsector->lightlevel >> LIGHTSEGSHIFT);
+			lightnum = R_SideLightLevel(curline->sidedef, frontsector->lightlevel) >> LIGHTSEGSHIFT;
 		else if (fog)
-			lightnum = (pfloor->master->frontsector->lightlevel >> LIGHTSEGSHIFT);
+			lightnum = R_SideLightLevel(curline->sidedef, pfloor->master->frontsector->lightlevel) >> LIGHTSEGSHIFT;
 		else if (fuzzy)
 			lightnum = LIGHTLEVELS-1;
 		else
-			lightnum = R_FakeFlat(frontsector, &tempsec, &templight, &templight, false)
+			lightnum = R_SideLightLevel(curline->sidedef, R_FakeFlat(frontsector, &tempsec, &templight, &templight, false)->lightlevel) >> LIGHTSEGSHIFT;
-				->lightlevel >> LIGHTSEGSHIFT;
 
 		if (pfloor->fofflags & FOF_FOG || (frontsector->extra_colormap && (frontsector->extra_colormap->flags & CMF_FOG)));
 			else if (curline->v1->y == curline->v2->y)
@@ -1463,7 +1488,7 @@ static void R_RenderSegLoop (void)
 			for (i = 0; i < dc_numlights; i++)
 			{
 				INT32 lightnum;
-				lightnum = (dc_lightlist[i].lightlevel >> LIGHTSEGSHIFT);
+				lightnum = R_SideLightLevel(curline->sidedef, dc_lightlist[i].lightlevel) >> LIGHTSEGSHIFT;
 
 				if (dc_lightlist[i].extra_colormap)
 					;
@@ -2650,7 +2675,7 @@ void R_StoreWallRange(INT32 start, INT32 stop)
 		//  use different light tables
 		//  for horizontal / vertical / diagonal
 		// OPTIMIZE: get rid of LIGHTSEGSHIFT globally
-		lightnum = (frontsector->lightlevel >> LIGHTSEGSHIFT);
+		lightnum = R_SideLightLevel(curline->sidedef, frontsector->lightlevel) >> LIGHTSEGSHIFT;
 
 		if (curline->v1->y == curline->v2->y)
 			lightnum--;