zorldo

Goofing around with Ebiten
git clone git://bsandro.tech/zorldo
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view.go (2938B)

      1 // Copyright 2019 The Ebiten Authors
      2 //
      3 // Licensed under the Apache License, Version 2.0 (the "License");
      4 // you may not use this file except in compliance with the License.
      5 // You may obtain a copy of the License at
      6 //
      7 //     http://www.apache.org/licenses/LICENSE-2.0
      8 //
      9 // Unless required by applicable law or agreed to in writing, software
     10 // distributed under the License is distributed on an "AS IS" BASIS,
     11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     12 // See the License for the specific language governing permissions and
     13 // limitations under the License.
     14 
     15 //go:build darwin
     16 // +build darwin
     17 
     18 package metal
     19 
     20 import (
     21 	"sync"
     22 
     23 	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/metal/ca"
     24 	"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/metal/mtl"
     25 )
     26 
     27 type view struct {
     28 	window uintptr
     29 	uiview uintptr
     30 
     31 	windowChanged bool
     32 	vsyncDisabled bool
     33 	fullscreen    bool
     34 
     35 	device mtl.Device
     36 	ml     ca.MetalLayer
     37 
     38 	once sync.Once
     39 }
     40 
     41 func (v *view) setDrawableSize(width, height int) {
     42 	v.ml.SetDrawableSize(width, height)
     43 }
     44 
     45 func (v *view) getMTLDevice() mtl.Device {
     46 	return v.device
     47 }
     48 
     49 func (v *view) setDisplaySyncEnabled(enabled bool) {
     50 	if !v.vsyncDisabled == enabled {
     51 		return
     52 	}
     53 	v.forceSetDisplaySyncEnabled(enabled)
     54 }
     55 
     56 func (v *view) forceSetDisplaySyncEnabled(enabled bool) {
     57 	v.ml.SetDisplaySyncEnabled(enabled)
     58 	v.vsyncDisabled = !enabled
     59 
     60 	// setting presentsWithTransaction true makes the FPS stable (#1196). We're not sure why...
     61 	v.updatePresentsWithTransaction()
     62 }
     63 
     64 func (v *view) setFullscreen(fullscreen bool) {
     65 	if v.fullscreen == fullscreen {
     66 		return
     67 	}
     68 	v.fullscreen = fullscreen
     69 	v.updatePresentsWithTransaction()
     70 }
     71 
     72 func (v *view) updatePresentsWithTransaction() {
     73 	v.ml.SetPresentsWithTransaction(v.usePresentsWithTransaction())
     74 	v.ml.SetMaximumDrawableCount(v.maximumDrawableCount())
     75 }
     76 
     77 func (v *view) colorPixelFormat() mtl.PixelFormat {
     78 	return v.ml.PixelFormat()
     79 }
     80 
     81 func (v *view) reset() error {
     82 	var err error
     83 	v.device, err = mtl.CreateSystemDefaultDevice()
     84 	if err != nil {
     85 		return err
     86 	}
     87 
     88 	v.ml = ca.MakeMetalLayer()
     89 	v.ml.SetDevice(v.device)
     90 	// https://developer.apple.com/documentation/quartzcore/cametallayer/1478155-pixelformat
     91 	//
     92 	// The pixel format for a Metal layer must be MTLPixelFormatBGRA8Unorm,
     93 	// MTLPixelFormatBGRA8Unorm_sRGB, MTLPixelFormatRGBA16Float, MTLPixelFormatBGRA10_XR, or
     94 	// MTLPixelFormatBGRA10_XR_sRGB.
     95 	v.ml.SetPixelFormat(mtl.PixelFormatBGRA8UNorm)
     96 
     97 	// The vsync state might be reset. Set the state again (#1364).
     98 	v.forceSetDisplaySyncEnabled(!v.vsyncDisabled)
     99 	v.ml.SetFramebufferOnly(true)
    100 
    101 	return nil
    102 }
    103 
    104 func (v *view) nextDrawable() ca.MetalDrawable {
    105 	d, err := v.ml.NextDrawable()
    106 	if err != nil {
    107 		// Drawable is nil. This can happen at the initial state. Let's wait and see.
    108 		return ca.MetalDrawable{}
    109 	}
    110 	return d
    111 }
    112 
    113 func (v *view) presentsWithTransaction() bool {
    114 	return v.ml.PresentsWithTransaction()
    115 }