Add support for VK_PRESENT_MODE_IMMEDIATE_KHR to macOS Cube demo.

- Only log performance stats on FPS logging if logging style is explicitly
  set to MVK_CONFIG_ACTIVITY_PERFORMANCE_LOGGING_STYLE_FRAME_COUNT (unrelated).

Demos/Cube/macOS/DemoViewController.m

@@ -43,13 +43,29 @@
 
 	self.view.wantsLayer = YES;		// Back the view with a layer created by the makeBackingLayer method.
 
-	const char* argv[] = { "cube" };
+	// Enabling this will sync the rendering loop with the natural display link (60 fps).
+	// Disabling this will allow the rendering loop to run flat out, limited only by the rendering speed.
+	bool useDisplayLink = true;
+
+	VkPresentModeKHR vkPresentMode = useDisplayLink ? VK_PRESENT_MODE_FIFO_KHR : VK_PRESENT_MODE_IMMEDIATE_KHR;
+	char vkPresentModeStr[64];
+	sprintf(vkPresentModeStr, "%d", vkPresentMode);
+
+	const char* argv[] = { "cube", "--present_mode", vkPresentModeStr };
 	int argc = sizeof(argv)/sizeof(char*);
 	demo_main(&demo, self.view.layer, argc, argv);
 
-	CVDisplayLinkCreateWithActiveCGDisplays(&_displayLink);
-	CVDisplayLinkSetOutputCallback(_displayLink, &DisplayLinkCallback, &demo);
-	CVDisplayLinkStart(_displayLink);
+	if (useDisplayLink) {
+		CVDisplayLinkCreateWithActiveCGDisplays(&_displayLink);
+		CVDisplayLinkSetOutputCallback(_displayLink, &DisplayLinkCallback, &demo);
+		CVDisplayLinkStart(_displayLink);
+	} else {
+		dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
+			while(true) {
+				demo_draw(&demo);
+			}
+		});
+	}
 }
 
 

Docs/Whats_New.md

@@ -19,6 +19,7 @@ MoltenVK 1.2.5
 Released TBD
 
 - Ensure non-dispatch compute commands don't interfere with compute encoding state used by dispatch commands.
+- Add support for `VK_PRESENT_MODE_IMMEDIATE_KHR` to macOS Cube demo.
 
 
 

MoltenVK/MoltenVK/GPUObjects/MVKDevice.mm

@@ -4114,7 +4114,6 @@ void MVKDevice::logActivityPerformance(MVKPerformanceTracker& activity, MVKPerfo
 }
 
 void MVKDevice::logPerformanceSummary() {
-	if (_activityPerformanceLoggingStyle == MVK_CONFIG_ACTIVITY_PERFORMANCE_LOGGING_STYLE_IMMEDIATE) { return; }
 
 	// Get a copy to minimize time under lock
 	MVKPerformanceStatistics perfStats;

MoltenVK/MoltenVK/GPUObjects/MVKSwapchain.mm

@@ -175,7 +175,9 @@ void MVKSwapchain::markFrameInterval() {
 				   perfLogCntLimit,
 				   (1000.0 / _device->_performanceStatistics.queue.frameInterval.averageDuration),
 				   mvkGetElapsedMilliseconds() / 1000.0);
-		_device->logPerformanceSummary();
+		if (mvkConfig().activityPerformanceLoggingStyle == MVK_CONFIG_ACTIVITY_PERFORMANCE_LOGGING_STYLE_FRAME_COUNT) {
+			_device->logPerformanceSummary();
+		}
 	}
 }