pyobjc-framework-metalkit

import objc from AppKit import NSApplication, NSWindow, NSView, NSApp, NSMakeRect, NSBackingStoreBuffered, NSWindowStyleMaskTitled, NSWindowStyleMaskClosable from MetalKit import MTKView from Metal import MTLCreateSystemDefaultDevice, MTLPixelFormatBGRA8Unorm from PyObjCTools import AppHelper # Define an MTKViewDelegate for basic rendering class PyMetalViewDelegate(objc.NSObject): def drawInMTKView_(self, view): # In a real app, you'd perform complex Metal rendering here. # This example simply clears the view to a solid color. commandQueue = view.device().newCommandQueue() commandBuffer = commandQueue.commandBuffer() renderPassDescriptor = view.currentRenderPassDescriptor() if renderPassDescriptor: # Set clear color and load action renderPassDescriptor.colorAttachments().objectAtIndex_(0).setClearColor_( objc.runtime.struct(red=0.1, green=0.3, blue=0.5, alpha=1.0, _pyobjc_structs_type_name="MTLClearColor") ) renderPassDescriptor.colorAttachments().objectAtIndex_(0).setLoadAction_(0) # MTLLoadActionClear renderEncoder = commandBuffer.renderCommandEncoderWithDescriptor_(renderPassDescriptor) renderEncoder.endEncoding() commandBuffer.presentDrawable_(view.currentDrawable()) commandBuffer.commit() def mtkView_drawableSizeWillChange_(self, view, size): # Respond to view size changes if needed for Metal resources pass class PyMetalAppDelegate(objc.NSObject): def applicationDidFinishLaunching_(self, notification): device = MTLCreateSystemDefaultDevice() if device is None: print("Metal is not supported on this device.") NSApp().terminate_(self) return window_rect = NSMakeRect(0, 0, 640, 480) window = NSWindow.alloc().initWithContentRect_styleMask_backing_defer_( window_rect, NSWindowStyleMaskTitled | NSWindowStyleMaskClosable, NSBackingStoreBuffered, False ) window.setTitle_("PyObjC MetalKit Quickstart") window.makeKeyAndOrderFront_(None) mtk_view = MTKView.alloc().initWithFrame_device_(window_rect, device) mtk_view.setColorPixelFormat_(MTLPixelFormatBGRA8Unorm) # Using enum value mtk_view.setClearColor_(objc.runtime.struct(red=0.2, green=0.4, blue=0.6, alpha=1.0, _pyobjc_structs_type_name="MTLClearColor")) mtk_view.setPaused_(False) # Ensure view is not paused mtk_view.setEnableSetNeedsDisplay_(False) # Allow continuous drawing # Set the delegate for rendering self.metal_delegate = PyMetalViewDelegate.alloc().init() mtk_view.setDelegate_(self.metal_delegate) window.contentView().addSubview_(mtk_view) self.window = window self.mtk_view = mtk_view print(f"MTKView created with device: {device.name()}") print("Close the window to terminate the application.") if __name__ == '__main__': # AppHelper.runEventLoop simplifies running a Cocoa application by managing NSApplication and its lifecycle. AppHelper.runEventLoop(mainLoop=PyMetalAppDelegate.alloc().init())