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view.go
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view.go
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// Copyright 2019 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
package metal
import (
"sync"
"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/metal/ca"
"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/metal/mtl"
)
type view struct {
window uintptr
uiview uintptr
windowChanged bool
vsync bool
device mtl.Device
ml ca.MetalLayer
once sync.Once
}
func (v *view) setDrawableSize(width, height int) {
v.ml.SetDrawableSize(width, height)
}
func (v *view) getMTLDevice() mtl.Device {
return v.device
}
func (v *view) setDisplaySyncEnabled(enabled bool) {
v.ml.SetDisplaySyncEnabled(enabled)
v.vsync = enabled
}
func (v *view) colorPixelFormat() mtl.PixelFormat {
return v.ml.PixelFormat()
}
func (v *view) reset() error {
var err error
v.device, err = mtl.CreateSystemDefaultDevice()
if err != nil {
return err
}
v.ml = ca.MakeMetalLayer()
v.ml.SetDevice(v.device)
// https://developer.apple.com/documentation/quartzcore/cametallayer/1478155-pixelformat
//
// The pixel format for a Metal layer must be MTLPixelFormatBGRA8Unorm,
// MTLPixelFormatBGRA8Unorm_sRGB, MTLPixelFormatRGBA16Float, MTLPixelFormatBGRA10_XR, or
// MTLPixelFormatBGRA10_XR_sRGB.
v.ml.SetPixelFormat(mtl.PixelFormatBGRA8UNorm)
v.ml.SetMaximumDrawableCount(3)
// The vsync state might be reset. Set the state again (#1364).
v.ml.SetDisplaySyncEnabled(v.vsync)
return nil
}
func (v *view) drawable() ca.MetalDrawable {
d, err := v.ml.NextDrawable()
if err != nil {
// Drawable is nil. This can happen at the initial state. Let's wait and see.
return ca.MetalDrawable{}
}
return d
}