metal: Clear the framebuffer if presenting without any other operations.
diff --git a/src/render/metal/SDL_render_metal.m b/src/render/metal/SDL_render_metal.m
index 04616e3..cb3f9cc 100644
--- a/src/render/metal/SDL_render_metal.m
+++ b/src/render/metal/SDL_render_metal.m
@@ -1518,17 +1518,21 @@ METAL_RenderPresent(SDL_Renderer * renderer)
{ @autoreleasepool {
METAL_RenderData *data = (__bridge METAL_RenderData *) renderer->driverdata;
- METAL_ActivateRenderCommandEncoder(renderer, MTLLoadActionLoad, NULL, nil);
-
- if (data.mtlcmdencoder != nil) {
- [data.mtlcmdencoder endEncoding];
- }
- if (data.mtlbackbuffer != nil) {
- [data.mtlcmdbuffer presentDrawable:data.mtlbackbuffer];
- }
- if (data.mtlcmdbuffer != nil) {
- [data.mtlcmdbuffer commit];
+ // If we don't have a command buffer, we can't present, so activate to get one.
+ if (data.mtlcmdencoder == nil) {
+ // We haven't even gotten a backbuffer yet? Clear it to black. Otherwise, load the existing data.
+ if (data.mtlbackbuffer == nil) {
+ MTLClearColor color = MTLClearColorMake(0.0f, 0.0f, 0.0f, 1.0f);
+ METAL_ActivateRenderCommandEncoder(renderer, MTLLoadActionClear, &color, nil);
+ } else {
+ METAL_ActivateRenderCommandEncoder(renderer, MTLLoadActionLoad, NULL, nil);
+ }
}
+
+ [data.mtlcmdencoder endEncoding];
+ [data.mtlcmdbuffer presentDrawable:data.mtlbackbuffer];
+ [data.mtlcmdbuffer commit];
+
data.mtlcmdencoder = nil;
data.mtlcmdbuffer = nil;
data.mtlbackbuffer = nil;