ebiten/internal/uidriver/glfw/graphics_mac.go

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// Copyright 2018 The Ebiten Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// +build darwin
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// +build !js
// +build !ebitengl
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package glfw
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// #cgo CFLAGS: -x objective-c
// #cgo LDFLAGS: -framework Foundation
//
// #import <Foundation/Foundation.h>
//
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// static int getMacOSMinorVersion() {
// NSOperatingSystemVersion version = [[NSProcessInfo processInfo] operatingSystemVersion];
// return (int)version.minorVersion;
// }
import "C"
import (
"sync"
"github.com/hajimehoshi/ebiten/internal/driver"
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"github.com/hajimehoshi/ebiten/internal/graphicsdriver/metal"
"github.com/hajimehoshi/ebiten/internal/graphicsdriver/metal/mtl"
"github.com/hajimehoshi/ebiten/internal/graphicsdriver/opengl"
)
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var (
// isMetalSupported represents whether Metal is supported.
isMetalSupported = true
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// isMetalSupportedOnce initializes isMetalSupported.
//
// Use sync.Once instead of init function to avoid init-order dependency (#886).
isMetalSupportedOnce sync.Once
)
func (*UserInterface) Graphics() driver.Graphics {
isMetalSupportedOnce.Do(func() {
// On old mac devices like iMac 2011, Metal is not supported (#779).
if _, err := mtl.CreateSystemDefaultDevice(); err != nil {
isMetalSupported = false
return
}
// On macOS 10.11 El Capitan, there is a rendering issue on Metal (#781).
// Use the OpenGL in macOS 10.11 or older.
if C.getMacOSMinorVersion() <= 11 {
isMetalSupported = false
return
}
})
if isMetalSupported {
return metal.Get()
}
return opengl.Get()
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}