gfxlib2/darwin: use CVDisplayLink as a fallback

Author: Markos-Th09

contrib/manifest/FreeBASIC-darwin-x86_64.lst

@@ -115,6 +115,15 @@ examples/GUI/wx-c/fonts_and_colours.bas
 examples/GUI/wx-c/mdi.bas
 examples/GUI/wx-c/sizers.bas
 examples/GUI/wx-c/wx-c_demo.bas
+examples/Makefile
+examples/OptimizePureAbstractTypes/OptimizePureAbstractTypes.bas
+examples/OptimizePureAbstractTypes/PureAbstractTypes.bas
+examples/OptimizePureAbstractTypes/TestPureAbstractTypes.PNG
+examples/OptimizePureAbstractTypes/inc/EXCEL.bi
+examples/OptimizePureAbstractTypes/inc/FBCom.bi
+examples/OptimizePureAbstractTypes/inc/MSO.bi
+examples/OptimizePureAbstractTypes/inc/VBE6EXT.bi
+examples/OptimizePureAbstractTypes/inc/stdole2.bi
 examples/allocate.bas
 examples/arrays.bas
 examples/bitfield.bas
@@ -261,10 +270,13 @@ examples/graphics/OpenGL/NeHe/lesson34.bas
 examples/graphics/OpenGL/NeHe/lesson36.bas
 examples/graphics/OpenGL/NeHe/milkshapemodel.bi
 examples/graphics/OpenGL/NeHe/tgaloader.bi
+examples/graphics/OpenGL/fbgfx_opengl
 examples/graphics/OpenGL/fbgfx_opengl.bas
 examples/graphics/OpenGL/fbgfx_texture.bas
 examples/graphics/OpenGL/fbgl/fbgl.bas
 examples/graphics/OpenGL/fbgl/fbgl.bi
+examples/graphics/OpenGL/fbgl/libfbgl.a
+examples/graphics/OpenGL/fbgl/line
 examples/graphics/OpenGL/fbgl/line.bas
 examples/graphics/OpenGL/gl_test.bas
 examples/graphics/OpenGL/glext_test.bas
@@ -1590,6 +1602,7 @@ examples/sound/data/example.mo3
 examples/sound/data/example1.ogg
 examples/sound/data/example2.ogg
 examples/sound/data/prodigy.wav
+examples/sound/portaudio-sine.bas
 examples/structs.bas
 examples/threads/consumer-producer.bas
 examples/threads/threaddetach.bas

src/gfxlib2/darwin/gfx_driver_opengl_cocoa.m

@@ -43,9 +43,20 @@
 static dispatch_semaphore_t vsyncSema = NULL;
 
 @interface OpenGLView : NSOpenGLView
+#if __MAC_OS_X_VERSION_MIN_REQUIRED >= 140000
 @property (nonatomic, strong) CADisplayLink *displayLink;
+#endif
 @end
 
+#if __MAC_OS_X_VERSION_MIN_REQUIRED < 140000
+static CVDisplayLinkRef cvDisplayLink = NULL;
+static CVReturn DisplayLinkCallback(CVDisplayLinkRef displayLink,
+									const CVTimeStamp *now,
+									const CVTimeStamp *outputTime,
+									CVOptionFlags flagsIn,
+									CVOptionFlags *flagsOut,
+									void *displayLinkContext);
+#endif
 @implementation OpenGLView
 - (BOOL)acceptsFirstResponder
 {
@@ -54,10 +65,14 @@ - (BOOL)acceptsFirstResponder
 - (void)createDisplayLink
 {
 	vsyncSema = dispatch_semaphore_create(0);
-	self.displayLink = [self displayLinkWithTarget:self
-													selector:@selector(waitVSync)];
-	[self.displayLink addToRunLoop:[NSRunLoop currentRunLoop]
-						   forMode:NSDefaultRunLoopMode];
+	#if __MAC_OS_X_VERSION_MIN_REQUIRED >= 140000
+		self.displayLink = [self displayLinkWithTarget:self selector:@selector(waitVSync)];
+		[self.displayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
+	#else
+		CVDisplayLinkCreateWithActiveCGDisplays(&cvDisplayLink);
+		CVDisplayLinkSetOutputCallback(cvDisplayLink, &DisplayLinkCallback, (__bridge void *)self);
+		CVDisplayLinkStart(cvDisplayLink);
+	#endif
 }
 
 - (void)waitVSync
@@ -67,14 +82,33 @@ - (void)waitVSync
 
 - (void)dealloc
 {
-	[self.displayLink invalidate];
-	self.displayLink = nil;
+	#if __MAC_OS_X_VERSION_MIN_REQUIRED >= 140000
+		[self.displayLink invalidate];
+		self.displayLink = nil;
+	#else
+		CVDisplayLinkStop(cvDisplayLink);
+		CVDisplayLinkRelease(cvDisplayLink);
+	#endif
 	dispatch_release(vsyncSema);
 	[super dealloc];
 }
 
 @end
 
+#if __MAC_OS_X_VERSION_MIN_REQUIRED < 140000
+static CVReturn DisplayLinkCallback(CVDisplayLinkRef displayLink,
+									const CVTimeStamp *now,
+									const CVTimeStamp *outputTime,
+									CVOptionFlags flagsIn,
+									CVOptionFlags *flagsOut,
+									void *displayLinkContext)
+{
+	OpenGLView *self = (__bridge OpenGLView *)displayLinkContext;
+	[self waitVSync];
+	return kCVReturnSuccess;
+}
+#endif
+
 extern char **_NSGetProgname(void);
 
 static void create_menu_bar(void)