Fixed bug 4134 - Render targets lose scale quality after minimizing a fullscreen window

Olli-Samuli Lehmus

If one creates a window with the SDL_WINDOW_FULLSCREEN_DESKTOP flag, and creates a render target with SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "linear"), and afterwards sets SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "nearest"), after minimizing the window, the scale quality hint is lost on the render target. Textures however do keep their interpolation modes.

src/render/SDL_sysrender.h

@@ -31,6 +31,13 @@
 
 typedef struct SDL_RenderDriver SDL_RenderDriver;
 
+typedef enum
+{
+    SDL_ScaleModeNearest,
+    SDL_ScaleModeLinear,
+    SDL_ScaleModeBest
+} SDL_ScaleMode;
+
 typedef struct
 {
     float x;
@@ -55,6 +62,7 @@ struct SDL_Texture
     int h;                      /**< The height of the texture */
     int modMode;                /**< The texture modulation mode */
     SDL_BlendMode blendMode;    /**< The texture blend mode */
+    SDL_ScaleMode scaleMode;    /**< The texture scale mode */
     Uint8 r, g, b, a;           /**< Texture modulation values */
 
     SDL_Renderer *renderer;