From 058213366bccf7f62d4c4c6061477d7a69ea336d Mon Sep 17 00:00:00 2001 From: Sam Lantinga Date: Fri, 1 Dec 2023 10:51:54 -0800 Subject: [PATCH] Make sure we use alpha of 0 when clearing a transparent window with no content --- src/render/metal/SDL_render_metal.m | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/src/render/metal/SDL_render_metal.m b/src/render/metal/SDL_render_metal.m index 4686fbd888..4cb7577fb2 100644 --- a/src/render/metal/SDL_render_metal.m +++ b/src/render/metal/SDL_render_metal.m @@ -1525,9 +1525,10 @@ static int METAL_RenderPresent(SDL_Renderer *renderer) // 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. + // We haven't even gotten a backbuffer yet? Load and clear it. Otherwise, load the existing data. if (data.mtlbackbuffer == nil) { - MTLClearColor color = MTLClearColorMake(0.0f, 0.0f, 0.0f, 1.0f); + float alpha = (SDL_GetWindowFlags(renderer->window) & SDL_WINDOW_TRANSPARENT) ? 0.0f : 1.0f; + MTLClearColor color = MTLClearColorMake(0.0f, 0.0f, 0.0f, alpha); ready = METAL_ActivateRenderCommandEncoder(renderer, MTLLoadActionClear, &color, nil); } else { ready = METAL_ActivateRenderCommandEncoder(renderer, MTLLoadActionLoad, NULL, nil);