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macOS: Add hint for blocking thread on OpenGL context update dispatch (#5708)

This commit is contained in:
Salman Ahmed 2022-08-10 03:40:00 +03:00 committed by GitHub
parent 7eb13c21c6
commit b4660e9d8b
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 34 additions and 1 deletions
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12
include/SDL_hints.h
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@ -977,6 +977,18 @@ extern "C" {
*/
#define SDL_HINT_MAC_CTRL_CLICK_EMULATE_RIGHT_CLICK "SDL_MAC_CTRL_CLICK_EMULATE_RIGHT_CLICK"
/**
* \brief A variable controlling whether dispatching OpenGL context updates should block the dispatching thread until the main thread finishes processing
*
* This variable can be set to the following values:
* "0" - Dispatching OpenGL context updates will allow the dispatching thread to continue execution.
* "1" - Dispatching OpenGL context updates will block the dispatching thread until the main thread finishes processing.
*
* This hint only applies to Mac OS X
*
*/
#define SDL_HINT_MAC_OPENGL_SYNC_DISPATCH "SDL_MAC_OPENGL_SYNC_DISPATCH"
/**
* \brief A variable setting the double click radius, in pixels.
*/

23
src/video/cocoa/SDL_cocoaopengl.m
View File

@ -31,8 +31,10 @@
#include <OpenGL/OpenGL.h>
#include <OpenGL/CGLRenderers.h>
#include "SDL_hints.h"
#include "SDL_loadso.h"
#include "SDL_opengl.h"
#include "../../SDL_hints_c.h"
#define DEFAULT_OPENGL "/System/Library/Frameworks/OpenGL.framework/Libraries/libGL.dylib"
@ -42,6 +44,14 @@
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
#endif
static SDL_bool SDL_opengl_sync_dispatch = SDL_FALSE;
static void SDLCALL
SDL_OpenGLSyncDispatchChanged(void *userdata, const char *name, const char *oldValue, const char *hint)
{
SDL_opengl_sync_dispatch = SDL_GetStringBoolean(hint, SDL_FALSE);
}
@implementation SDLOpenGLContext : NSOpenGLContext
- (id)initWithFormat:(NSOpenGLPixelFormat *)format
@ -52,6 +62,8 @@
SDL_AtomicSet(&self->dirty, 0);
self->window = NULL;
}
SDL_AddHintCallback(SDL_HINT_MAC_OPENGL_SYNC_DISPATCH, SDL_OpenGLSyncDispatchChanged, NULL);
return self;
}
@ -135,10 +147,19 @@
if ([NSThread isMainThread]) {
[super update];
} else {
dispatch_async(dispatch_get_main_queue(), ^{ [super update]; });
if (SDL_opengl_sync_dispatch) {
dispatch_sync(dispatch_get_main_queue(), ^{ [super update]; });
} else {
dispatch_async(dispatch_get_main_queue(), ^{ [super update]; });
}
}
}
- (void)dealloc
{
SDL_DelHintCallback(SDL_HINT_MAC_OPENGL_SYNC_DISPATCH, SDL_OpenGLSyncDispatchChanged, NULL);
}
@end