Fix sRGB issues with glBlitFramebuffer on WGL

wgpu-hal/src/gles/wgl.rs

@@ -532,6 +532,12 @@ impl Surface {
         unsafe { gl.bind_framebuffer(glow::DRAW_FRAMEBUFFER, None) };
         unsafe { gl.bind_framebuffer(glow::READ_FRAMEBUFFER, Some(sc.framebuffer)) };
 
+        if self.srgb_capable {
+            // Disable sRGB conversions for `glBlitFramebuffer` as behavior does diverge between
+            // drivers and formats otherwise and we want to ensure no sRGB conversions happen.
+            unsafe { gl.disable(glow::FRAMEBUFFER_SRGB) };
+        }
+
         // Note the Y-flipping here. GL's presentation is not flipped,
         // but main rendering is. Therefore, we Y-flip the output positions
         // in the shader, and also this blit.
@@ -550,6 +556,10 @@ impl Surface {
             )
         };
 
+        if self.srgb_capable {
+            unsafe { gl.enable(glow::FRAMEBUFFER_SRGB) };
+        }
+
         unsafe { gl.bind_renderbuffer(glow::RENDERBUFFER, None) };
         unsafe { gl.bind_framebuffer(glow::READ_FRAMEBUFFER, None) };