Add DEVILUTIONX_DISPLAY_TEXTURE_FORMAT

Some platforms, such as PS2, can benefit from a different texture
format. Makes the texture format a CMake setting.

CMake/Definitions.cmake

@@ -90,6 +90,7 @@ foreach(
   REMAP_KEYBOARD_KEYS
   DEVILUTIONX_DEFAULT_RESAMPLER
   STREAM_ALL_AUDIO_MIN_FILE_SIZE
+  DEVILUTIONX_DISPLAY_TEXTURE_FORMAT
 )
   if(DEFINED ${def_name} AND NOT ${def_name} STREQUAL "")
     list(APPEND DEVILUTIONX_DEFINITIONS ${def_name}=${${def_name}})

CMakeLists.txt

@@ -106,6 +106,12 @@ option(MACOSX_STANDALONE_APP_BUNDLE "Generate a portable app bundle to use on ot
 cmake_dependent_option(DISABLE_TCP "Disable TCP multiplayer option" OFF "NOT NONET" ON)
 cmake_dependent_option(DISABLE_ZERO_TIER "Disable ZeroTier multiplayer option" OFF "NOT NONET" ON)
 
+# Graphics options
+if(NOT USE_SDL1)
+  set(DEVILUTIONX_DISPLAY_TEXTURE_FORMAT "SDL_PIXELFORMAT_RGB888" CACHE STRING "Texture format for DevilutionX textures when using the GPU renderer")
+  mark_as_advanced(DEVILUTIONX_DISPLAY_TEXTURE_FORMAT)
+endif()
+
 # Sound options
 option(NOSOUND "Disable sound support" OFF)
 option(DEVILUTIONX_RESAMPLER_SPEEX "Build with Speex resampler" ON)

Source/storm/storm_svid.cpp

@@ -285,7 +285,7 @@ bool SVidPlayBegin(const char *filename, int flags)
 	if (renderer != nullptr) {
 		int renderWidth = static_cast<int>(SVidWidth);
 		int renderHeight = static_cast<int>(SVidHeight);
-		texture = SDLWrap::CreateTexture(renderer, SDL_PIXELFORMAT_RGB888, SDL_TEXTUREACCESS_STREAMING, renderWidth, renderHeight);
+		texture = SDLWrap::CreateTexture(renderer, DEVILUTIONX_DISPLAY_TEXTURE_FORMAT, SDL_TEXTUREACCESS_STREAMING, renderWidth, renderHeight);
 		if (SDL_RenderSetLogicalSize(renderer, renderWidth, renderHeight) <= -1) {
 			ErrSdl();
 		}

Source/utils/display.cpp

@@ -388,7 +388,7 @@ void ReinitializeTexture()
 	auto quality = StrCat(static_cast<int>(*sgOptions.Graphics.scaleQuality));
 	SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, quality.c_str());
 
-	texture = SDLWrap::CreateTexture(renderer, SDL_PIXELFORMAT_RGB888, SDL_TEXTUREACCESS_STREAMING, gnScreenWidth, gnScreenHeight);
+	texture = SDLWrap::CreateTexture(renderer, DEVILUTIONX_DISPLAY_TEXTURE_FORMAT, SDL_TEXTUREACCESS_STREAMING, gnScreenWidth, gnScreenHeight);
 }
 
 void ReinitializeIntegerScale()