gioui.org@v0.6.1-0.20240506124620-7a9ce51988ce/gpu/headless/headless_darwin.go (about)

     1  // SPDX-License-Identifier: Unlicense OR MIT
     2  
     3  package headless
     4  
     5  import (
     6  	"errors"
     7  
     8  	"gioui.org/gpu"
     9  	_ "gioui.org/internal/cocoainit"
    10  )
    11  
    12  /*
    13  #cgo CFLAGS: -Werror -Wno-deprecated-declarations -fobjc-arc -x objective-c
    14  #cgo LDFLAGS: -framework CoreGraphics -framework Metal -framework Foundation
    15  
    16  #import <Metal/Metal.h>
    17  
    18  static CFTypeRef createDevice(void) {
    19  	@autoreleasepool {
    20  		id dev = MTLCreateSystemDefaultDevice();
    21  		return CFBridgingRetain(dev);
    22  	}
    23  }
    24  
    25  static CFTypeRef newCommandQueue(CFTypeRef devRef) {
    26  	@autoreleasepool {
    27  		id<MTLDevice> dev = (__bridge id<MTLDevice>)devRef;
    28  		return CFBridgingRetain([dev newCommandQueue]);
    29  	}
    30  }
    31  */
    32  import "C"
    33  
    34  type mtlContext struct {
    35  	dev   C.CFTypeRef
    36  	queue C.CFTypeRef
    37  }
    38  
    39  func init() {
    40  	newContextPrimary = func() (context, error) {
    41  		dev := C.createDevice()
    42  		if dev == 0 {
    43  			return nil, errors.New("headless: failed to create Metal device")
    44  		}
    45  		queue := C.newCommandQueue(dev)
    46  		if queue == 0 {
    47  			C.CFRelease(dev)
    48  			return nil, errors.New("headless: failed to create MTLQueue")
    49  		}
    50  		return &mtlContext{dev: dev, queue: queue}, nil
    51  	}
    52  }
    53  
    54  func (c *mtlContext) API() gpu.API {
    55  	return gpu.Metal{
    56  		Device:      uintptr(c.dev),
    57  		Queue:       uintptr(c.queue),
    58  		PixelFormat: int(C.MTLPixelFormatRGBA8Unorm_sRGB),
    59  	}
    60  }
    61  
    62  func (c *mtlContext) MakeCurrent() error {
    63  	return nil
    64  }
    65  
    66  func (c *mtlContext) ReleaseCurrent() {}
    67  
    68  func (d *mtlContext) Release() {
    69  	C.CFRelease(d.dev)
    70  	C.CFRelease(d.queue)
    71  	*d = mtlContext{}
    72  }