Merge pull request #1278 from tech4me/bg-color-fix

Port Citra #4047 & #4052: add change background color support

src/video_core/renderer_base.cpp

@@ -19,6 +19,7 @@ void RendererBase::RefreshBaseSettings() {
     UpdateCurrentFramebufferLayout();
 
     renderer_settings.use_framelimiter = Settings::values.use_frame_limit;
+    renderer_settings.set_background_color = true;
 }
 
 void RendererBase::UpdateCurrentFramebufferLayout() {

src/video_core/renderer_base.h

@@ -19,6 +19,7 @@ namespace VideoCore {
 
 struct RendererSettings {
     std::atomic_bool use_framelimiter{false};
+    std::atomic_bool set_background_color{false};
 };
 
 class RendererBase : NonCopyable {

src/video_core/renderer_opengl/renderer_opengl.cpp

@@ -369,6 +369,12 @@ void RendererOpenGL::DrawScreenTriangles(const ScreenInfo& screen_info, float x,
  * Draws the emulated screens to the emulator window.
  */
 void RendererOpenGL::DrawScreen() {
+    if (renderer_settings.set_background_color) {
+        // Update background color before drawing
+        glClearColor(Settings::values.bg_red, Settings::values.bg_green, Settings::values.bg_blue,
+                     0.0f);
+    }
+
     const auto& layout = render_window.GetFramebufferLayout();
     const auto& screen = layout.screen;