JNIEXPORT jlong JNICALL Java_org_jetbrains_skiko_redrawer_MetalRedrawer_createMetalDevice()

in skiko/src/awtMain/objectiveC/macos/MetalRedrawer.mm [121:177]

• 44 lines of code
• 3 McCabe index (conditional complexity)

JNIEXPORT jlong JNICALL Java_org_jetbrains_skiko_redrawer_MetalRedrawer_createMetalDevice(
    JNIEnv *env, jobject redrawer, jlong windowPtr, jboolean transparency, jint frameBuffering, jlong adapterPtr, jlong platformInfoPtr)
{
    @autoreleasepool {
        id<MTLDevice> adapter = (__bridge id<MTLDevice>) (void *) adapterPtr;

        MetalDevice *device = [MetalDevice new];

        NSObject<JAWT_SurfaceLayers>* dsi_mac = (__bridge NSObject<JAWT_SurfaceLayers> *) (void*) platformInfoPtr;

        CALayer *container = [dsi_mac windowLayer];
        [container removeAllAnimations];
        [container setAutoresizingMask: (kCALayerWidthSizable|kCALayerHeightSizable)];
        [container setNeedsDisplayOnBoundsChange: YES];

        AWTMetalLayer *layer = [AWTMetalLayer new];
        if (frameBuffering == 2 || frameBuffering == 3) {
            layer.maximumDrawableCount = frameBuffering;
        }

        [container addSublayer: layer];
        layer.javaRef = env->NewGlobalRef(redrawer);

        id<MTLCommandQueue> fQueue = [MTLCommandQueueCache.sharedCache commandQueueForDevice:adapter];

        device.container = container;
        device.layer = layer;
        device.adapter = adapter;
        device.queue = fQueue;

        device.layer.device = device.adapter;
        device.layer.pixelFormat = MTLPixelFormatBGRA8Unorm;
        device.layer.contentsGravity = kCAGravityTopLeft;

        CGFloat transparent[] = { 0.0f, 0.0f, 0.0f, 0.0f };
        device.layer.backgroundColor = CGColorCreate(CGColorSpaceCreateDeviceRGB(), transparent);
        device.layer.opaque = NO;
        device.layer.framebufferOnly = NO;

        /// max inflight command buffers count matches swapchain size to avoid overcommitment
        device.inflightSemaphore = dispatch_semaphore_create(device.layer.maximumDrawableCount);

        NSWindow* window = (__bridge NSWindow*) (void *) windowPtr;
        jmethodID onOcclusionStateChanged = getOnOcclusionStateChangedMethodID(env, redrawer);
        device.occlusionObserver =
            [[NSNotificationCenter defaultCenter] addObserverForName:NSWindowDidChangeOcclusionStateNotification
                                                              object:window
                                                               queue:[NSOperationQueue mainQueue]
                                                          usingBlock:^(NSNotification * _Nonnull note) {
                BOOL isOccluded = ([window occlusionState] & NSWindowOcclusionStateVisible) == 0;
                JNIEnv *jniEnv = resolveJNIEnvForCurrentThread();
                jniEnv->CallObjectMethod(layer.javaRef, onOcclusionStateChanged, isOccluded);
            }];

        return (jlong) (__bridge_retained void *) device;
    }
}