GLCache: Added a function to convert cached PixelFormats back to texture formats.

TODO: The way we handle cached formats must change, framebuffer and texture formats are too different to keep them in the same place.

src/video_core/renderer_opengl/gl_rasterizer_cache.h

@@ -115,6 +115,18 @@ struct SurfaceParams {
         }
     }
 
+    static Tegra::Texture::TextureFormat TextureFormatFromPixelFormat(PixelFormat format) {
+        // TODO(Subv): Properly implement this
+        switch (format) {
+        case PixelFormat::RGBA8:
+            return Tegra::Texture::TextureFormat::A8R8G8B8;
+        case PixelFormat::DXT1:
+            return Tegra::Texture::TextureFormat::DXT1;
+        default:
+            UNREACHABLE();
+        }
+    }
+
     static bool CheckFormatsBlittable(PixelFormat pixel_format_a, PixelFormat pixel_format_b) {
         SurfaceType a_type = GetFormatType(pixel_format_a);
         SurfaceType b_type = GetFormatType(pixel_format_b);