+#endif
+}
+
+#if defined(TARGET_SDL2)
+
+static boolean equalSDLPixelFormat(SDL_PixelFormat *format1,
+ SDL_PixelFormat *format2)
+{
+ return (format1->format == format2->format &&
+ format1->BitsPerPixel == format2->BitsPerPixel &&
+ format1->BytesPerPixel == format2->BytesPerPixel &&
+ format1->Rmask == format2->Rmask &&
+ format1->Gmask == format2->Gmask &&
+ format1->Bmask == format2->Bmask);
+}
+
+static Pixel SDLGetColorKey(SDL_Surface *surface)
+{
+ Pixel color_key;
+
+ if (SDL_GetColorKey(surface, &color_key) != 0)
+ return -1;
+
+ return color_key;
+}
+
+static boolean SDLHasColorKey(SDL_Surface *surface)
+{
+ return (SDLGetColorKey(surface) != -1);
+}
+
+static boolean SDLHasAlpha(SDL_Surface *surface)
+{
+ SDL_BlendMode blend_mode;
+
+ if (SDL_GetSurfaceBlendMode(surface, &blend_mode) != 0)
+ return FALSE;
+
+ return (blend_mode == SDL_BLENDMODE_BLEND);
+}
+
+static void SDLSetAlpha(SDL_Surface *surface, boolean set, int alpha)
+{
+ SDL_BlendMode blend_mode = (set ? SDL_BLENDMODE_BLEND : SDL_BLENDMODE_NONE);
+
+ SDL_SetSurfaceBlendMode(surface, blend_mode);
+ SDL_SetSurfaceAlphaMod(surface, alpha);
+}
+
+SDL_Surface *SDLGetNativeSurface(SDL_Surface *surface)
+{
+ SDL_PixelFormat format;
+ SDL_Surface *new_surface;
+
+ if (surface == NULL)
+ return NULL;
+
+ if (backbuffer && backbuffer->surface)
+ {
+ format = *backbuffer->surface->format;
+ format.Amask = surface->format->Amask; // keep alpha channel
+ }
+ else
+ {
+ format = *surface->format;
+ }
+
+ new_surface = SDL_ConvertSurface(surface, &format, 0);
+
+ if (new_surface == NULL)
+ Error(ERR_EXIT, "SDL_ConvertSurface() failed: %s", SDL_GetError());
+
+ return new_surface;
+}
+
+boolean SDLSetNativeSurface(SDL_Surface **surface)
+{
+ SDL_Surface *new_surface;
+
+ if (surface == NULL ||
+ *surface == NULL ||
+ backbuffer == NULL ||
+ backbuffer->surface == NULL)
+ return FALSE;
+
+ // if pixel format already optimized for destination surface, do nothing
+ if (equalSDLPixelFormat((*surface)->format, backbuffer->surface->format))
+ return FALSE;
+
+ new_surface = SDLGetNativeSurface(*surface);
+
+ SDL_FreeSurface(*surface);
+
+ *surface = new_surface;
+
+ return TRUE;
+}
+
+#else
+
+static Pixel SDLGetColorKey(SDL_Surface *surface)
+{
+ if ((surface->flags & SDL_SRCCOLORKEY) == 0)
+ return -1;
+
+ return surface->format->colorkey;
+}
+
+static boolean SDLHasColorKey(SDL_Surface *surface)
+{
+ return (SDLGetColorKey(surface) != -1);
+}
+
+static boolean SDLHasAlpha(SDL_Surface *surface)
+{
+ return ((surface->flags & SDL_SRCALPHA) != 0);
+}
+
+static void SDLSetAlpha(SDL_Surface *surface, boolean set, int alpha)
+{
+ SDL_SetAlpha(surface, (set ? SDL_SRCALPHA : 0), alpha);
+}
+
+SDL_Surface *SDLGetNativeSurface(SDL_Surface *surface)
+{
+ SDL_Surface *new_surface;
+
+ if (surface == NULL)
+ return NULL;
+
+ if (!video.initialized)
+ new_surface = SDL_ConvertSurface(surface, surface->format, SURFACE_FLAGS);
+ else if (SDLHasAlpha(surface))
+ new_surface = SDL_DisplayFormatAlpha(surface);
+ else
+ new_surface = SDL_DisplayFormat(surface);
+
+ if (new_surface == NULL)
+ Error(ERR_EXIT, "%s() failed: %s",
+ (video.initialized ? "SDL_DisplayFormat" : "SDL_ConvertSurface"),
+ SDL_GetError());
+
+ return new_surface;
+}
+
+boolean SDLSetNativeSurface(SDL_Surface **surface)
+{
+ SDL_Surface *new_surface;
+
+ if (surface == NULL ||
+ *surface == NULL ||
+ !video.initialized)
+ return FALSE;
+
+ new_surface = SDLGetNativeSurface(*surface);
+
+ SDL_FreeSurface(*surface);
+
+ *surface = new_surface;
+
+ return TRUE;
+}
+
+#endif
+
+#if defined(TARGET_SDL2)
+static SDL_Texture *SDLCreateTextureFromSurface(SDL_Surface *surface)
+{
+ if (program.headless)
+ return NULL;
+
+ SDL_Texture *texture = SDL_CreateTextureFromSurface(sdl_renderer, surface);
+
+ if (texture == NULL)
+ Error(ERR_EXIT, "SDL_CreateTextureFromSurface() failed: %s",
+ SDL_GetError());
+
+ return texture;
+}
+#endif
+
+void SDLCreateBitmapTextures(Bitmap *bitmap)
+{
+#if defined(TARGET_SDL2)
+ if (bitmap == NULL)
+ return;
+
+ if (bitmap->texture)
+ SDL_DestroyTexture(bitmap->texture);
+ if (bitmap->texture_masked)
+ SDL_DestroyTexture(bitmap->texture_masked);
+
+ bitmap->texture = SDLCreateTextureFromSurface(bitmap->surface);
+ bitmap->texture_masked = SDLCreateTextureFromSurface(bitmap->surface_masked);
+#endif
+}
+
+void SDLFreeBitmapTextures(Bitmap *bitmap)
+{
+#if defined(TARGET_SDL2)
+ if (bitmap == NULL)
+ return;
+
+ if (bitmap->texture)
+ SDL_DestroyTexture(bitmap->texture);
+ if (bitmap->texture_masked)
+ SDL_DestroyTexture(bitmap->texture_masked);
+
+ bitmap->texture = NULL;
+ bitmap->texture_masked = NULL;
+#endif