Allow PHOT deco, in old saves only

src/client/GameSave.cpp

@@ -1003,6 +1003,11 @@ void GameSave::readOPS(char * data, int dataLength)
 							particles[newIndex].ctype = 0;
 						}
 						break;
+					case PT_PHOT:
+						if (savedVersion < 90)
+						{
+							particles[newIndex].flags |= FLAG_PHOTDECO;
+						}
 					}
 					//note: PSv was used in version 77.0 and every version before, add something in PSv too if the element is that old
 					newIndex++;
@@ -1550,6 +1555,10 @@ void GameSave::readPSv(char * data, int dataLength)
 		// no more particle properties to load, so we can change type here without messing up loading
 		if (i && i<=NPART)
 		{
+			if (ver<90 && particles[i-1].type == PT_PHOT)
+			{
+				particles[i-1].flags |= FLAG_PHOTDECO;
+			}
 			if (ver<79 && particles[i-1].type == PT_SPNG)
 			{
 				if (fabs(particles[i-1].vx)>0.0f || fabs(particles[i-1].vy)>0.0f)

src/lua/LuaScriptInterface.cpp

@@ -1910,6 +1910,7 @@ void LuaScriptInterface::initElementsAPI()
 	SETCONST(l, FLAG_STAGNANT);
 	SETCONST(l, FLAG_SKIPMOVE);
 	SETCONST(l, FLAG_MOVABLE);
+	SETCONST(l, FLAG_PHOTDECO);
 	SETCONST(l, ST_NONE);
 	SETCONST(l, ST_SOLID);
 	SETCONST(l, ST_LIQUID);

src/simulation/Elements.h

@@ -35,7 +35,9 @@
 #define FLAG_STAGNANT	0x1
 #define FLAG_SKIPMOVE  0x2 // skip movement for one frame, only implemented for PHOT
 #define FLAG_WATEREQUAL 0x4 //if a liquid was already checked during equalization
-#define FLAG_MOVABLE  0x8 // if can move
+#define FLAG_MOVABLE  0x8 // compatibility with old saves (moving SPNG), only applies to SPNG
+#define FLAG_PHOTDECO  0x8 // compatibility with old saves (decorated photons), only applies to PHOT. Having the same value as FLAG_MOVABLE is fine because they apply to different elements, and this saves space for future flags,
+
 
 #define ST_NONE 0
 #define ST_SOLID 1

src/simulation/elements/PHOT.cpp

@@ -121,6 +121,10 @@ int Element_PHOT::graphics(GRAPHICS_FUNC_ARGS)
 
 	*pixel_mode &= ~PMODE_FLAT;
 	*pixel_mode |= FIRE_ADD | PMODE_ADD | NO_DECO;
+	if (cpart->flags & FLAG_PHOTDECO)
+	{
+		*pixel_mode &= ~NO_DECO;
+	}
 	return 0;
 }