MacOS Mojave test and fix

src/MiniFB_internal.c

@@ -103,7 +103,7 @@ resize_dst(SWindowData *window_data, uint32_t width, uint32_t height) {
     window_data->dst_height   = (uint32_t) (height * window_data->factor_height);
 }
 
-#if !defined(USE_OPENGL_API)
+#if !defined(USE_OPENGL_API) && !defined(USE_METAL_API)
 
 //-------------------------------------
 void

src/macosx/MacMiniFB.m

@@ -297,6 +297,7 @@ mfb_update_events(struct mfb_window *window) {
 
 //-------------------------------------
 extern double   g_time_for_frame;
+extern bool     g_use_hardware_sync;
 
 bool
 mfb_wait_sync(struct mfb_window *window) {
@@ -312,6 +313,10 @@ mfb_wait_sync(struct mfb_window *window) {
         return false;
     }
 
+    if(g_use_hardware_sync) {
+        return true;
+    }
+
     @autoreleasepool {
         SWindowData_OSX *window_data_osx = (SWindowData_OSX *) window_data->specific;
         if(window_data_osx == 0x0) {

src/macosx/OSXViewDelegate.m

@@ -80,6 +80,10 @@ NSString *g_shader_src = kShader(
 
         // Setup command queue
         command_queue = [metal_device newCommandQueue];
+        id<MTLCommandBuffer> commandBuffer = [command_queue commandBuffer];
+        if ([commandBuffer respondsToSelector:@selector(presentDrawable:afterMinimumDuration:)]) {
+            g_use_hardware_sync  = true;
+        }
 
         [self _createShaders];
         [self _createAssets];
@@ -169,9 +173,16 @@ NSString *g_shader_src = kShader(
 //-------------------------------------
 - (void) drawInMTKView:(nonnull MTKView *) view {
     if (g_target_fps_changed) {
+        // MacOS is ignoring this :()
+        if (g_time_for_frame == 0) {
+            // Contrary to what is stated in the documentation, 
+            // 0 means that it does not update.
+            view.preferredFramesPerSecond = 9999;
+        }
+        else {
             view.preferredFramesPerSecond = (int) (1.0 / g_time_for_frame);
+        }
         g_target_fps_changed = false;
-        g_use_hardware_sync  = true;
     }
 
     // Wait to ensure only MaxBuffersInFlight number of frames are getting proccessed