If last framebuffer texture isn't set, use active framebuffer otherwise don't draw.

src/xenia/gpu/gl4/gl4_command_processor.cc

@@ -396,19 +396,24 @@ void GL4CommandProcessor::PerformSwap(uint32_t frontbuffer_ptr,
   // !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
   // HACK: just use whatever our current framebuffer is.
   GLuint framebuffer_texture = last_framebuffer_texture_;
-  /*GLuint framebuffer_texture = active_framebuffer_
-                                        ? active_framebuffer_->color_targets[0]
-                                        : last_framebuffer_texture_;*/
+
+  if (last_framebuffer_texture_ == 0) {
+    framebuffer_texture =
+        active_framebuffer_ ? active_framebuffer_->color_targets[0] : 0;
+  }
 
   // Copy the the given framebuffer to the current backbuffer.
   Rect2D src_rect(0, 0, frontbuffer_width ? frontbuffer_width : 1280,
                   frontbuffer_height ? frontbuffer_height : 720);
   Rect2D dest_rect(0, 0, swap_state_.width, swap_state_.height);
-  reinterpret_cast<xe::ui::gl::GLContext*>(context_.get())
-      ->blitter()
-      ->CopyColorTexture2D(framebuffer_texture, src_rect,
-                           static_cast<GLuint>(swap_state_.back_buffer_texture),
-                           dest_rect, GL_LINEAR, true);
+  if (framebuffer_texture != 0) {
+    reinterpret_cast<xe::ui::gl::GLContext*>(context_.get())
+        ->blitter()
+        ->CopyColorTexture2D(
+            framebuffer_texture, src_rect,
+            static_cast<GLuint>(swap_state_.back_buffer_texture), dest_rect,
+            GL_LINEAR, true);
+  }
 
   if (FLAGS_draw_all_framebuffers) {
     int32_t offsetx = (1280 - (1280 / 5));