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// SPDX-License-Identifier: Unlicense OR MIT
//go:build !nometal
// +build !nometal
package app
import (
"errors"
"gioui.org/gpu"
)
/*
#cgo CFLAGS: -Werror -xobjective-c -fmodules -fobjc-arc
@import Metal;
@import QuartzCore.CAMetalLayer;
#include <CoreFoundation/CoreFoundation.h>
static CFTypeRef createMetalDevice(void) {
@autoreleasepool {
id<MTLDevice> dev = MTLCreateSystemDefaultDevice();
return CFBridgingRetain(dev);
}
}
static void setupLayer(CFTypeRef layerRef, CFTypeRef devRef) {
@autoreleasepool {
CAMetalLayer *layer = (__bridge CAMetalLayer *)layerRef;
id<MTLDevice> dev = (__bridge id<MTLDevice>)devRef;
layer.device = dev;
// Package gpu assumes an sRGB-encoded framebuffer.
layer.pixelFormat = MTLPixelFormatBGRA8Unorm_sRGB;
if (@available(iOS 11.0, *)) {
// Never let nextDrawable time out and return nil.
layer.allowsNextDrawableTimeout = NO;
}
}
}
static CFTypeRef nextDrawable(CFTypeRef layerRef) {
@autoreleasepool {
CAMetalLayer *layer = (__bridge CAMetalLayer *)layerRef;
return CFBridgingRetain([layer nextDrawable]);
}
}
static CFTypeRef drawableTexture(CFTypeRef drawableRef) {
@autoreleasepool {
id<CAMetalDrawable> drawable = (__bridge id<CAMetalDrawable>)drawableRef;
return CFBridgingRetain(drawable.texture);
}
}
static void presentDrawable(CFTypeRef queueRef, CFTypeRef drawableRef) {
@autoreleasepool {
id<MTLDrawable> drawable = (__bridge id<MTLDrawable>)drawableRef;
id<MTLCommandQueue> queue = (__bridge id<MTLCommandQueue>)queueRef;
id<MTLCommandBuffer> cmdBuffer = [queue commandBuffer];
[cmdBuffer presentDrawable:drawable];
[cmdBuffer commit];
}
}
static CFTypeRef newCommandQueue(CFTypeRef devRef) {
@autoreleasepool {
id<MTLDevice> dev = (__bridge id<MTLDevice>)devRef;
return CFBridgingRetain([dev newCommandQueue]);
}
}
*/
import "C"
type mtlContext struct {
dev C.CFTypeRef
view C.CFTypeRef
layer C.CFTypeRef
queue C.CFTypeRef
drawable C.CFTypeRef
texture C.CFTypeRef
}
func newMtlContext(w *window) (*mtlContext, error) {
dev := C.createMetalDevice()
if dev == 0 {
return nil, errors.New("metal: MTLCreateSystemDefaultDevice failed")
}
view := w.contextView()
layer := getMetalLayer(view)
if layer == 0 {
C.CFRelease(dev)
return nil, errors.New("metal: CAMetalLayer construction failed")
}
queue := C.newCommandQueue(dev)
if layer == 0 {
C.CFRelease(dev)
C.CFRelease(layer)
return nil, errors.New("metal: [MTLDevice newCommandQueue] failed")
}
C.setupLayer(layer, dev)
c := &mtlContext{
dev: dev,
view: view,
layer: layer,
queue: queue,
}
return c, nil
}
func (c *mtlContext) RenderTarget() (gpu.RenderTarget, error) {
if c.drawable != 0 || c.texture != 0 {
return nil, errors.New("metal:a previous RenderTarget wasn't Presented")
}
c.drawable = C.nextDrawable(c.layer)
if c.drawable == 0 {
return nil, errors.New("metal: [CAMetalLayer nextDrawable] failed")
}
c.texture = C.drawableTexture(c.drawable)
if c.texture == 0 {
return nil, errors.New("metal: CADrawable.texture is nil")
}
return gpu.MetalRenderTarget{
Texture: uintptr(c.texture),
}, nil
}
func (c *mtlContext) API() gpu.API {
return gpu.Metal{
Device: uintptr(c.dev),
Queue: uintptr(c.queue),
PixelFormat: int(C.MTLPixelFormatBGRA8Unorm_sRGB),
}
}
func (c *mtlContext) Release() {
C.CFRelease(c.queue)
C.CFRelease(c.dev)
C.CFRelease(c.layer)
if c.drawable != 0 {
C.CFRelease(c.drawable)
}
if c.texture != 0 {
C.CFRelease(c.texture)
}
*c = mtlContext{}
}
func (c *mtlContext) Present() error {
C.CFRelease(c.texture)
c.texture = 0
C.presentDrawable(c.queue, c.drawable)
C.CFRelease(c.drawable)
c.drawable = 0
return nil
}
func (c *mtlContext) Lock() error {
return nil
}
func (c *mtlContext) Unlock() {}
func (c *mtlContext) Refresh() error {
resizeDrawable(c.view, c.layer)
return nil
}
func (w *window) NewContext() (context, error) {
return newMtlContext(w)
}
|
