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86 lines
2.8 KiB
86 lines
2.8 KiB
import androidx.compose.ui.ComposeScene |
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import androidx.compose.ui.unit.Constraints |
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import androidx.compose.ui.unit.Density |
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import org.jetbrains.skia.* |
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import org.jetbrains.skia.FramebufferFormat.Companion.GR_GL_RGBA8 |
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import org.jetbrains.skiko.FrameDispatcher |
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import org.lwjgl.glfw.GLFW.* |
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import org.lwjgl.opengl.GL |
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import org.lwjgl.opengl.GL11 |
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import org.lwjgl.opengl.GL30.GL_FRAMEBUFFER_BINDING |
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import org.lwjgl.system.MemoryUtil.NULL |
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import kotlin.system.exitProcess |
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fun main() { |
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var width = 640 |
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var height = 480 |
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glfwInit() |
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glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE) |
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glfwWindowHint(GLFW_RESIZABLE, GLFW_TRUE) |
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val windowHandle: Long = glfwCreateWindow(width, height, "Compose LWJGL Demo", NULL, NULL) |
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glfwMakeContextCurrent(windowHandle) |
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glfwSwapInterval(1) |
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GL.createCapabilities() |
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val context = DirectContext.makeGL() |
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var surface = createSurface(width, height, context) // Skia Surface, bound to the OpenGL framebuffer |
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val glfwDispatcher = GlfwCoroutineDispatcher() // a custom coroutine dispatcher, in which Compose will run |
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glfwSetWindowCloseCallback(windowHandle) { |
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glfwDispatcher.stop() |
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} |
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lateinit var composeScene: ComposeScene |
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fun render() { |
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surface.canvas.clear(Color.WHITE) |
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composeScene.constraints = Constraints(maxWidth = width, maxHeight = height) |
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composeScene.render(surface.canvas, System.nanoTime()) |
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context.flush() |
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glfwSwapBuffers(windowHandle) |
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} |
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val frameDispatcher = FrameDispatcher(glfwDispatcher) { render() } |
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val density = Density(glfwGetWindowContentScale(windowHandle)) |
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composeScene = ComposeScene(glfwDispatcher, density, invalidate = frameDispatcher::scheduleFrame) |
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glfwSetWindowSizeCallback(windowHandle) { _, windowWidth, windowHeight -> |
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width = windowWidth |
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height = windowHeight |
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surface.close() |
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surface = createSurface(width, height, context) |
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glfwSwapInterval(0) |
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render() |
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glfwSwapInterval(1) |
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} |
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composeScene.subscribeToGLFWEvents(windowHandle) |
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composeScene.setContent { App() } |
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glfwShowWindow(windowHandle) |
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glfwDispatcher.runLoop() |
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composeScene.close() |
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glfwDestroyWindow(windowHandle) |
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exitProcess(0) |
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} |
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private fun createSurface(width: Int, height: Int, context: DirectContext): Surface { |
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val fbId = GL11.glGetInteger(GL_FRAMEBUFFER_BINDING) |
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val renderTarget = BackendRenderTarget.makeGL(width, height, 0, 8, fbId, GR_GL_RGBA8) |
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return Surface.makeFromBackendRenderTarget( |
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context, renderTarget, SurfaceOrigin.BOTTOM_LEFT, SurfaceColorFormat.RGBA_8888, ColorSpace.sRGB |
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) |
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} |
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private fun glfwGetWindowContentScale(window: Long): Float { |
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val array = FloatArray(1) |
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glfwGetWindowContentScale(window, array, FloatArray(1)) |
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return array[0] |
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} |