More smart choosing graphics card.

skiko/build.gradle.kts

@@ -381,6 +381,7 @@ tasks.withType(LinkSharedLibrary::class.java).configureEach {
                     "-framework", "CoreServices",
                     "-framework", "CoreText",
                     "-framework", "Foundation",
+                    "-framework", "IOKit",
                     "-framework", "Metal",
                     "-framework", "OpenGL",
                     "-framework", "QuartzCore" // for CoreAnimation

skiko/src/jvmMain/objectiveC/macos/MetalRedrawer.mm

@@ -13,6 +13,11 @@
 #import <mtl/GrMtlBackendContext.h>
 #import <mtl/GrMtlTypes.h>
 
+#define MuxGraphicsCard 7
+#define kOpen 0
+#define kGetMuxState 3
+#define kDriverClassName "AppleGraphicsControl"
+
 @interface AWTMetalLayer : CAMetalLayer
 
 @property jobject javaRef;
@@ -100,22 +105,52 @@ JNIEXPORT jlong JNICALL Java_org_jetbrains_skiko_redrawer_MetalRedrawer_makeMeta
     return (jlong) renderTarget;
 }
 
-id<MTLDevice> MTLCreateIntegratedDevice() {
-    NSArray<id<MTLDevice>> *devices = MTLCopyAllDevices();
+BOOL isUsingIntegratedGPU() {
+    kern_return_t kernResult = 0;
+    io_iterator_t iterator = IO_OBJECT_NULL;
+    io_service_t service = IO_OBJECT_NULL;
+    
+    kernResult = IOServiceGetMatchingServices(kIOMasterPortDefault, IOServiceMatching(kDriverClassName), &iterator);
+    assert(kernResult == KERN_SUCCESS);
+
+    service = IOIteratorNext(iterator);
+    io_connect_t switcherConnect;
+    
+    kernResult = IOServiceOpen(service, mach_task_self(), 0, &switcherConnect);
+    assert(kernResult == KERN_SUCCESS);
+    
+    kernResult = IOConnectCallScalarMethod(switcherConnect, kOpen, NULL, 0, NULL, NULL);
+    assert(kernResult == KERN_SUCCESS);
+
+    uint64_t output;
+    uint32_t outputCount = 1;
+    uint64_t scalarI_64[2] = { 1, MuxGraphicsCard };
+    
+    kernResult = IOConnectCallScalarMethod(switcherConnect,
+                                           kGetMuxState,
+                                           scalarI_64,
+                                           2,
+                                           &output,
+                                           &outputCount);
+    return output != 0;
+}
 
+id<MTLDevice> MTLCreateIntegratedDevice() {
+    BOOL isIntegratedGPU = isUsingIntegratedGPU();
     id<MTLDevice> gpu = nil;
 
-    for (id<MTLDevice> device in devices) {
-        if (device.isLowPower) {
-            gpu = device;
-            break;
+    if (isIntegratedGPU) {
+        NSArray<id<MTLDevice>> *devices = MTLCopyAllDevices();
+        for (id<MTLDevice> device in devices) {
+            if (device.isLowPower) {
+                gpu = device;
+                break;
+            }
         }
     }
-
     if (gpu == nil) {
         gpu = MTLCreateSystemDefaultDevice();
     }
-
     return gpu;
 }