From 9b9d0d484d53c3f3258871cc92bfa1e04a001e6f Mon Sep 17 00:00:00 2001
From: Alex Szpakowski <[EMAIL REDACTED]>
Date: Mon, 15 Feb 2021 11:49:09 -0400
Subject: [PATCH] mac/iOS: allow Metal in windows created without an explicit
backend
Fixes SDL_CreateWindowAndRenderer (and similar situations) not choosing a Metal backend. See #3991.
Passing an explicit backend into CreateWindow, eg SDL_WINDOW_OPENGL or SDL_WINDOW_METAL, will still prevent the window from being used with other backend types.
---
src/render/metal/SDL_render_metal.m | 2 +-
src/video/SDL_video.c | 20 +++++++++++---------
2 files changed, 12 insertions(+), 10 deletions(-)
diff --git a/src/render/metal/SDL_render_metal.m b/src/render/metal/SDL_render_metal.m
index 32c1c48b2..67ac1b663 100644
--- a/src/render/metal/SDL_render_metal.m
+++ b/src/render/metal/SDL_render_metal.m
@@ -1674,7 +1674,7 @@ - (void)dealloc
}
window_flags = SDL_GetWindowFlags(window);
- if (!(window_flags & (SDL_WINDOW_METAL|SDL_WINDOW_OPENGL))) {
+ if (!(window_flags & SDL_WINDOW_METAL)) {
changed_window = SDL_TRUE;
if (SDL_RecreateWindow(window, (window_flags & ~(SDL_WINDOW_VULKAN | SDL_WINDOW_OPENGL)) | SDL_WINDOW_METAL) < 0) {
return NULL;
diff --git a/src/video/SDL_video.c b/src/video/SDL_video.c
index d750a356c..77f252b54 100644
--- a/src/video/SDL_video.c
+++ b/src/video/SDL_video.c
@@ -1453,6 +1453,7 @@ SDL_Window *
SDL_CreateWindow(const char *title, int x, int y, int w, int h, Uint32 flags)
{
SDL_Window *window;
+ Uint32 graphics_flags = flags & (SDL_WINDOW_OPENGL | SDL_WINDOW_METAL | SDL_WINDOW_VULKAN);
if (!_this) {
/* Initialize the video system if needed */
@@ -1480,16 +1481,16 @@ SDL_CreateWindow(const char *title, int x, int y, int w, int h, Uint32 flags)
return NULL;
}
- /* Some platforms have OpenGL enabled by default */
+ /* Some platforms have certain graphics backends enabled by default */
+ if (!_this->is_dummy && !graphics_flags && !SDL_IsVideoContextExternal()) {
#if (SDL_VIDEO_OPENGL && __MACOSX__) || (__IPHONEOS__ && !TARGET_OS_MACCATALYST) || __ANDROID__ || __NACL__
- if (!_this->is_dummy && !(flags & SDL_WINDOW_VULKAN) && !(flags & SDL_WINDOW_METAL) && !SDL_IsVideoContextExternal()) {
flags |= SDL_WINDOW_OPENGL;
- }
-#elif TARGET_OS_MACCATALYST
- if (!_this->is_dummy && !(flags & SDL_WINDOW_VULKAN) && !(flags & SDL_WINDOW_OPENGL) && !SDL_IsVideoContextExternal()) {
+#endif
+#if SDL_VIDEO_METAL && (TARGET_OS_MACCATALYST || __MACOSX__ || __IPHONEOS__)
flags |= SDL_WINDOW_METAL;
- }
#endif
+ }
+
if (flags & SDL_WINDOW_OPENGL) {
if (!_this->GL_CreateContext) {
SDL_SetError("OpenGL support is either not configured in SDL "
@@ -1509,7 +1510,7 @@ SDL_CreateWindow(const char *title, int x, int y, int w, int h, Uint32 flags)
"(%s) or platform", _this->name);
return NULL;
}
- if (flags & SDL_WINDOW_OPENGL) {
+ if (graphics_flags & SDL_WINDOW_OPENGL) {
SDL_SetError("Vulkan and OpenGL not supported on same window");
return NULL;
}
@@ -1525,11 +1526,12 @@ SDL_CreateWindow(const char *title, int x, int y, int w, int h, Uint32 flags)
"(%s) or platform", _this->name);
return NULL;
}
- if (flags & SDL_WINDOW_OPENGL) {
+ /* 'flags' may have default flags appended, don't check against that. */
+ if (graphics_flags & SDL_WINDOW_OPENGL) {
SDL_SetError("Metal and OpenGL not supported on same window");
return NULL;
}
- if (flags & SDL_WINDOW_VULKAN) {
+ if (graphics_flags & SDL_WINDOW_VULKAN) {
SDL_SetError("Metal and Vulkan not supported on same window. "
"To use MoltenVK, set SDL_WINDOW_VULKAN only.");
return NULL;