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_render.c

@@ -493,6 +493,21 @@ GetClosestSupportedFormat(SDL_Renderer * renderer, Uint32 format)
     return renderer->info.texture_formats[0];
 }
 
+SDL_ScaleMode SDL_GetScaleMode(void)
+{
+    const char *hint = SDL_GetHint(SDL_HINT_RENDER_SCALE_QUALITY);
+
+    if (!hint || SDL_strcasecmp(hint, "nearest") == 0) {
+        return SDL_ScaleModeNearest;
+    } else if (SDL_strcasecmp(hint, "linear") == 0) {
+        return SDL_ScaleModeLinear;
+    } else if (SDL_strcasecmp(hint, "best") == 0) {
+        return SDL_ScaleModeBest;
+    } else {
+        return (SDL_ScaleMode)SDL_atoi(hint);
+    }
+}
+
 SDL_Texture *
 SDL_CreateTexture(SDL_Renderer * renderer, Uint32 format, int access, int w, int h)
 {
@@ -534,6 +549,7 @@ SDL_CreateTexture(SDL_Renderer * renderer, Uint32 format, int access, int w, int
     texture->g = 255;
     texture->b = 255;
     texture->a = 255;
+    texture->scaleMode = SDL_GetScaleMode();
     texture->renderer = renderer;
     texture->next = renderer->textures;
     if (renderer->textures) {

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;

src/render/direct3d/SDL_render_d3d.c

@@ -664,18 +664,6 @@ D3D_SupportsBlendMode(SDL_Renderer * renderer, SDL_BlendMode blendMode)
     return SDL_TRUE;
 }
 
-static D3DTEXTUREFILTERTYPE
-GetScaleQuality(void)
-{
-    const char *hint = SDL_GetHint(SDL_HINT_RENDER_SCALE_QUALITY);
-
-    if (!hint || *hint == '0' || SDL_strcasecmp(hint, "nearest") == 0) {
-        return D3DTEXF_POINT;
-    } else /* if (*hint == '1' || SDL_strcasecmp(hint, "linear") == 0) */ {
-        return D3DTEXF_LINEAR;
-    }
-}
-
 static int
 D3D_CreateTextureRep(IDirect3DDevice9 *device, D3D_TextureRep *texture, DWORD usage, Uint32 format, D3DFORMAT d3dfmt, int w, int h)
 {
@@ -829,7 +817,7 @@ D3D_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
     if (!texturedata) {
         return SDL_OutOfMemory();
     }
-    texturedata->scaleMode = GetScaleQuality();
+    texturedata->scaleMode = (texture->scaleMode == SDL_ScaleModeNearest) ? D3DTEXF_POINT : D3DTEXF_LINEAR;
 
     texture->driverdata = texturedata;
 

src/render/direct3d11/SDL_render_d3d11.c

@@ -1161,17 +1161,6 @@ D3D11_SupportsBlendMode(SDL_Renderer * renderer, SDL_BlendMode blendMode)
     return SDL_TRUE;
 }
 
-static D3D11_FILTER
-GetScaleQuality(void)
-{
-    const char *hint = SDL_GetHint(SDL_HINT_RENDER_SCALE_QUALITY);
-    if (!hint || *hint == '0' || SDL_strcasecmp(hint, "nearest") == 0) {
-        return D3D11_FILTER_MIN_MAG_MIP_POINT;
-    } else /* if (*hint == '1' || SDL_strcasecmp(hint, "linear") == 0) */ {
-        return D3D11_FILTER_MIN_MAG_MIP_LINEAR;
-    }
-}
-
 static int
 D3D11_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
 {
@@ -1192,7 +1181,7 @@ D3D11_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
         SDL_OutOfMemory();
         return -1;
     }
-    textureData->scaleMode = GetScaleQuality();
+    textureData->scaleMode = (texture->scaleMode == SDL_ScaleModeNearest) ?  D3D11_FILTER_MIN_MAG_MIP_POINT : D3D11_FILTER_MIN_MAG_MIP_LINEAR;
 
     texture->driverdata = textureData;
 

src/render/metal/SDL_render_metal.m

@@ -853,8 +853,7 @@ METAL_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
     }
 
     METAL_TextureData *texturedata = [[METAL_TextureData alloc] init];
-    const char *hint = SDL_GetHint(SDL_HINT_RENDER_SCALE_QUALITY);
-    if (!hint || *hint == '0' || SDL_strcasecmp(hint, "nearest") == 0) {
+    if (texture->scaleMode == SDL_ScaleModeNearest) {
         texturedata.mtlsampler = data.mtlsamplernearest;
     } else {
         texturedata.mtlsampler = data.mtlsamplerlinear;

src/render/opengl/SDL_render_gl.c

@@ -703,18 +703,6 @@ convert_format(GL_RenderData *renderdata, Uint32 pixel_format,
     return SDL_TRUE;
 }
 
-static GLenum
-GetScaleQuality(void)
-{
-    const char *hint = SDL_GetHint(SDL_HINT_RENDER_SCALE_QUALITY);
-
-    if (!hint || *hint == '0' || SDL_strcasecmp(hint, "nearest") == 0) {
-        return GL_NEAREST;
-    } else {
-        return GL_LINEAR;
-    }
-}
-
 static int
 GL_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
 {
@@ -803,7 +791,7 @@ GL_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
 
     data->format = format;
     data->formattype = type;
-    scaleMode = GetScaleQuality();
+    scaleMode = (texture->scaleMode == SDL_ScaleModeNearest) ? GL_NEAREST : GL_LINEAR;
     renderdata->glEnable(data->type);
     renderdata->glBindTexture(data->type, data->texture);
     renderdata->glTexParameteri(data->type, GL_TEXTURE_MIN_FILTER, scaleMode);

src/render/opengles/SDL_render_gles.c

@@ -524,18 +524,6 @@ power_of_2(int input)
     return value;
 }
 
-static GLenum
-GetScaleQuality(void)
-{
-    const char *hint = SDL_GetHint(SDL_HINT_RENDER_SCALE_QUALITY);
-
-    if (!hint || *hint == '0' || SDL_strcasecmp(hint, "nearest") == 0) {
-        return GL_NEAREST;
-    } else {
-        return GL_LINEAR;
-    }
-}
-
 static int
 GLES_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
 {
@@ -603,7 +591,7 @@ GLES_CreateTexture(SDL_Renderer * renderer, SDL_Texture * texture)
 
     data->format = format;
     data->formattype = type;
-    scaleMode = GetScaleQuality();
+    scaleMode = (texture->scaleMode == SDL_ScaleModeNearest) ? GL_NEAREST : GL_LINEAR;
     renderdata->glBindTexture(data->type, data->texture);
     renderdata->glTexParameteri(data->type, GL_TEXTURE_MIN_FILTER, scaleMode);
     renderdata->glTexParameteri(data->type, GL_TEXTURE_MAG_FILTER, scaleMode);

src/render/opengles2/SDL_render_gles2.c

@@ -553,18 +553,6 @@ static void GLES2_UnlockTexture(SDL_Renderer *renderer, SDL_Texture *texture);
 static int GLES2_SetRenderTarget(SDL_Renderer * renderer, SDL_Texture * texture);
 static void GLES2_DestroyTexture(SDL_Renderer *renderer, SDL_Texture *texture);
 
-static GLenum
-GetScaleQuality(void)
-{
-    const char *hint = SDL_GetHint(SDL_HINT_RENDER_SCALE_QUALITY);
-
-    if (!hint || *hint == '0' || SDL_strcasecmp(hint, "nearest") == 0) {
-        return GL_NEAREST;
-    } else {
-        return GL_LINEAR;
-    }
-}
-
 static int
 GLES2_CreateTexture(SDL_Renderer *renderer, SDL_Texture *texture)
 {
@@ -625,7 +613,7 @@ GLES2_CreateTexture(SDL_Renderer *renderer, SDL_Texture *texture)
     data->nv12 = ((texture->format == SDL_PIXELFORMAT_NV12) || (texture->format == SDL_PIXELFORMAT_NV21));
     data->texture_u = 0;
     data->texture_v = 0;
-    scaleMode = GetScaleQuality();
+    scaleMode = (texture->scaleMode == SDL_ScaleModeNearest) ? GL_NEAREST : GL_LINEAR;
 
     /* Allocate a blob for image renderdata */
     if (texture->access == SDL_TEXTUREACCESS_STREAMING) {

src/render/psp/SDL_render_psp.c

@@ -186,18 +186,6 @@ TextureNextPow2(unsigned int w)
 }
 
 
-static int
-GetScaleQuality(void)
-{
-    const char *hint = SDL_GetHint(SDL_HINT_RENDER_SCALE_QUALITY);
-
-    if (!hint || *hint == '0' || SDL_strcasecmp(hint, "nearest") == 0) {
-        return GU_NEAREST; /* GU_NEAREST good for tile-map */
-    } else {
-        return GU_LINEAR; /* GU_LINEAR good for scaling */
-    }
-}
-
 static int
 PixelFormatToPSPFMT(Uint32 format)
 {
@@ -514,7 +502,7 @@ void
 TextureActivate(SDL_Texture * texture)
 {
     PSP_TextureData *psp_texture = (PSP_TextureData *) texture->driverdata;
-    int scaleMode = GetScaleQuality();
+    int scaleMode = (texture->scaleMode == SDL_ScaleModeNearest) ? GU_NEAREST : GU_LINEAR;
 
     /* Swizzling is useless with small textures. */
     if (texture->w >= 16 || texture->h >= 16)

src/render/software/SDL_render_sw.c

@@ -587,18 +587,6 @@ SW_RenderCopy(SDL_Renderer * renderer, SDL_Texture * texture,
     }
 }
 
-static int
-GetScaleQuality(void)
-{
-    const char *hint = SDL_GetHint(SDL_HINT_RENDER_SCALE_QUALITY);
-
-    if (!hint || *hint == '0' || SDL_strcasecmp(hint, "nearest") == 0) {
-        return 0;
-    } else {
-        return 1;
-    }
-}
-
 static int
 SW_RenderCopyEx(SDL_Renderer * renderer, SDL_Texture * texture,
                 const SDL_Rect * srcrect, const SDL_FRect * dstrect,
@@ -717,7 +705,7 @@ SW_RenderCopyEx(SDL_Renderer * renderer, SDL_Texture * texture,
 
     if (!retval) {
         SDLgfx_rotozoomSurfaceSizeTrig(tmp_rect.w, tmp_rect.h, angle, &dstwidth, &dstheight, &cangle, &sangle);
-        src_rotated = SDLgfx_rotateSurface(src_clone, angle, dstwidth/2, dstheight/2, GetScaleQuality(), flip & SDL_FLIP_HORIZONTAL, flip & SDL_FLIP_VERTICAL, dstwidth, dstheight, cangle, sangle);
+        src_rotated = SDLgfx_rotateSurface(src_clone, angle, dstwidth/2, dstheight/2, (texture->scaleMode == SDL_ScaleModeNearest) ? 0 : 1, flip & SDL_FLIP_HORIZONTAL, flip & SDL_FLIP_VERTICAL, dstwidth, dstheight, cangle, sangle);
         if (src_rotated == NULL) {
             retval = -1;
         }