GPU support on Windows

Author: igordmn

benchmarks/multiplatform/benchmarks/src/desktopMain/kotlin/GraphicsContext.desktop.kt

@@ -0,0 +1,43 @@
+import org.jetbrains.skia.ColorSpace
+import org.jetbrains.skia.PixelGeometry
+import org.jetbrains.skia.Surface
+import org.jetbrains.skia.SurfaceColorFormat
+import org.jetbrains.skia.SurfaceOrigin
+import org.jetbrains.skia.SurfaceProps
+import org.jetbrains.skiko.ExperimentalSkikoApi
+import org.jetbrains.skiko.graphicapi.DirectXOffscreenContext
+import org.jetbrains.skiko.hostOs
+
+@OptIn(ExperimentalSkikoApi::class)
+fun graphicsContext(): GraphicsContext? = when {
+    hostOs.isWindows -> DirectXGraphicsContext()
+    else -> {
+        println("Unsupported desktop host OS: $hostOs. Using non-GPU graphic context")
+        null
+    }
+}
+
+@OptIn(ExperimentalSkikoApi::class)
+class DirectXGraphicsContext() : GraphicsContext {
+    // Note: we don't close `context` and `texture` after using,
+    // because it is created once in the main function
+    private val context = DirectXOffscreenContext()
+    private var texture: DirectXOffscreenContext.Texture? = null
+
+    override fun surface(width: Int, height: Int): Surface {
+        texture?.close()
+        texture = context.Texture(width, height)
+        return Surface.makeFromBackendRenderTarget(
+            context.directContext,
+            texture!!.backendRenderTarget,
+            SurfaceOrigin.TOP_LEFT,
+            SurfaceColorFormat.BGRA_8888,
+            ColorSpace.sRGB,
+            SurfaceProps(pixelGeometry = PixelGeometry.UNKNOWN)
+        ) ?: throw IllegalStateException("Can't create Surface")
+    }
+
+    override suspend fun awaitGPUCompletion() {
+        texture?.waitForCompletion()
+    }
+}

benchmarks/multiplatform/benchmarks/src/desktopMain/kotlin/main.desktop.kt

@@ -8,5 +8,5 @@ import kotlinx.coroutines.runBlocking
 
 fun main(args: Array<String>) {
     Config.setGlobalFromArgs(args)
-    runBlocking(Dispatchers.Main) { runBenchmarks() }
+    runBlocking(Dispatchers.Main) { runBenchmarks(graphicsContext = graphicsContext()) }
 }

benchmarks/multiplatform/gradle/libs.versions.toml

@@ -1,5 +1,5 @@
 [versions]
-compose-multiplatform = "1.8.0-beta01"
+compose-multiplatform = "1.8.0-rc01"
 kotlin = "2.1.20"
 kotlinx-coroutines = "1.8.0"
 kotlinx-serialization = "1.8.0"