Add sector flag that protects the colormap from being changed

src/p_setup.c

@@ -947,6 +947,8 @@ static void P_LoadSectors(UINT8 *data)
 
 		ss->floorpic_angle = ss->ceilingpic_angle = 0;
 
+		ss->colormap_protected = false;
+
 		P_InitializeSector(ss);
 	}
 }
@@ -1468,6 +1470,8 @@ static void ParseTextmapSectorParameter(UINT32 i, char *param, char *val)
 		textmap_colormap.used = true;
 		textmap_colormap.flags |= CMF_FADEFULLBRIGHTSPRITES;
 	}
+	else if (fastcmp(param, "colormapprotected") && fastcmp("true", val))
+		sectors[i].colormap_protected = true;
 }
 
 static void ParseTextmapSidedefParameter(UINT32 i, char *param, char *val)
@@ -1702,6 +1706,8 @@ static void P_LoadTextmap(void)
 
 		sc->floorpic_angle = sc->ceilingpic_angle = 0;
 
+		sc->colormap_protected = false;
+
 		textmap_colormap.used = false;
 		textmap_colormap.lightcolor = 0;
 		textmap_colormap.lightalpha = 25;

src/p_spec.c

@@ -3518,6 +3518,9 @@ static void P_ProcessLineSpecial(line_t *line, mobj_t *mo, sector_t *callsec)
 
 			for (secnum = -1; (secnum = P_FindSectorFromTag(line->args[0], secnum)) >= 0;)
 			{
+				if (sectors[secnum].colormap_protected)
+					continue;
+
 				P_ResetColormapFader(&sectors[secnum]);
 
 				if (line->args[2] & 1) // relative calc
@@ -3852,6 +3855,9 @@ static void P_ProcessLineSpecial(line_t *line, mobj_t *mo, sector_t *callsec)
 			{
 				extracolormap_t *source_exc, *dest_exc, *exc;
 
+				if (sectors[secnum].colormap_protected)
+					continue;
+
 				// Don't interrupt ongoing fade
 				if (!(line->args[3] & 8192)
 					&& sectors[secnum].fadecolormapdata)
@@ -7413,6 +7419,10 @@ void P_SpawnSpecials(boolean fromnetsave)
 				for (s = -1; (s = P_FindSectorFromTag(lines[i].args[0], s)) >= 0;)
 				{
 					extracolormap_t *exc;
+
+					if (sectors[s].colormap_protected)
+						continue;
+
 					if (!udmf)
 						exc = sides[lines[i].sidenum[0]].colormap_data;
 					else
@@ -8370,7 +8380,7 @@ static void P_AddFakeFloorFader(ffloor_t *rover, size_t sectornum, size_t ffloor
 		d->destlightlevel = -1;
 
 	// Set a separate thinker for colormap fading
-	if (docolormap && !(rover->flags & FF_NOSHADE) && sectors[rover->secnum].spawn_extra_colormap)
+	if (docolormap && !(rover->flags & FF_NOSHADE) && sectors[rover->secnum].spawn_extra_colormap && !sectors[rover->secnum].colormap_protected)
 	{
 		extracolormap_t *dest_exc,
 			*source_exc = sectors[rover->secnum].extra_colormap ? sectors[rover->secnum].extra_colormap : R_GetDefaultColormap();

src/r_defs.h

@@ -352,6 +352,7 @@ typedef struct sector_s
 
 	// per-sector colormaps!
 	extracolormap_t *extra_colormap;
+	boolean colormap_protected;
 
 #ifdef HWRENDER // ----- for special tricks with HW renderer -----
 	boolean pseudoSector;