ebiten/internal/graphicsdriver/metal/graphics_darwin.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.
package metal
import (
"fmt"
"image"
"math"
"runtime"
"sort"
"time"
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"unsafe"
"github.com/ebitengine/purego/objc"
"github.com/hajimehoshi/ebiten/v2/internal/cocoa"
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"github.com/hajimehoshi/ebiten/v2/internal/graphics"
"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
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"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/metal/ca"
"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/metal/mtl"
"github.com/hajimehoshi/ebiten/v2/internal/shaderir"
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)
type Graphics struct {
view view
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cq mtl.CommandQueue
cb mtl.CommandBuffer
rce mtl.RenderCommandEncoder
dsss map[stencilMode]mtl.DepthStencilState
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screenDrawable ca.MetalDrawable
buffers map[mtl.CommandBuffer][]mtl.Buffer
unusedBuffers map[mtl.Buffer]struct{}
lastDst *Image
lastFillRule graphicsdriver.FillRule
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vb mtl.Buffer
ib mtl.Buffer
images map[graphicsdriver.ImageID]*Image
nextImageID graphicsdriver.ImageID
shaders map[graphicsdriver.ShaderID]*Shader
nextShaderID graphicsdriver.ShaderID
transparent bool
maxImageSize int
tmpTextures []mtl.Texture
lastFlush time.Time
pool cocoa.NSAutoreleasePool
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}
type stencilMode int
const (
noStencil stencilMode = iota
incrementStencil
invertStencil
drawWithStencil
)
var (
systemDefaultDevice mtl.Device
systemDefaultDeviceErr error
)
func init() {
// mtl.CreateSystemDefaultDevice must be called on the main thread (#2147).
d, err := mtl.CreateSystemDefaultDevice()
if err != nil {
systemDefaultDeviceErr = err
return
}
systemDefaultDevice = d
}
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// NewGraphics creates an implementation of graphicsdriver.Graphics for Metal.
// The returned graphics value is nil iff the error is not nil.
func NewGraphics() (graphicsdriver.Graphics, error) {
// On old mac devices like iMac 2011, Metal is not supported (#779).
// TODO: Is there a better way to check whether Metal is available or not?
// It seems OK to call MTLCreateSystemDefaultDevice multiple times, so this should be fine.
if systemDefaultDeviceErr != nil {
return nil, fmt.Errorf("metal: mtl.CreateSystemDefaultDevice failed: %w", systemDefaultDeviceErr)
}
g := &Graphics{}
if runtime.GOOS != "ios" {
// Initializing a Metal device and a layer must be done in the main thread on macOS.
// Note that this assumes NewGraphics is called on the main thread on desktops.
if err := g.view.initialize(systemDefaultDevice); err != nil {
return nil, err
}
}
return g, nil
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}
func (g *Graphics) Begin() error {
// NSAutoreleasePool is required to release drawable correctly (#847).
// https://developer.apple.com/library/archive/documentation/3DDrawing/Conceptual/MTLBestPracticesGuide/Drawables.html
g.pool = cocoa.NSAutoreleasePool_new()
return nil
}
func (g *Graphics) End(present bool) error {
g.flushIfNeeded(present)
g.screenDrawable = ca.MetalDrawable{}
g.pool.Release()
g.pool.ID = 0
return nil
}
func (g *Graphics) SetWindow(window uintptr) {
// Note that [NSApp mainWindow] returns nil when the window is borderless.
// Then the window is needed to be given explicitly.
g.view.setWindow(window)
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}
func (g *Graphics) SetUIView(uiview uintptr) {
// TODO: Should this be called on the main thread?
g.view.setUIView(uiview)
}
func pow2(x uintptr) uintptr {
if x > (math.MaxUint+1)/2 {
return math.MaxUint
}
var p2 uintptr = 1
for p2 < x {
p2 *= 2
}
return p2
}
func (g *Graphics) gcBuffers() {
for cb, bs := range g.buffers {
// If the command buffer still lives, the buffer must not be updated.
// TODO: Handle an error?
if cb.Status() != mtl.CommandBufferStatusCompleted {
continue
}
for _, b := range bs {
if g.unusedBuffers == nil {
g.unusedBuffers = map[mtl.Buffer]struct{}{}
}
g.unusedBuffers[b] = struct{}{}
}
delete(g.buffers, cb)
cb.Release()
}
const maxUnusedBuffers = 10
if len(g.unusedBuffers) > maxUnusedBuffers {
bufs := make([]mtl.Buffer, 0, len(g.unusedBuffers))
for b := range g.unusedBuffers {
bufs = append(bufs, b)
}
sort.Slice(bufs, func(a, b int) bool {
return bufs[a].Length() > bufs[b].Length()
})
for _, b := range bufs[maxUnusedBuffers:] {
delete(g.unusedBuffers, b)
b.Release()
}
}
}
func (g *Graphics) availableBuffer(length uintptr) mtl.Buffer {
if g.cb == (mtl.CommandBuffer{}) {
g.cb = g.cq.MakeCommandBuffer()
}
var newBuf mtl.Buffer
for b := range g.unusedBuffers {
if b.Length() >= length {
newBuf = b
delete(g.unusedBuffers, b)
break
}
}
if newBuf == (mtl.Buffer{}) {
newBuf = g.view.getMTLDevice().MakeBufferWithLength(pow2(length), resourceStorageMode)
}
if g.buffers == nil {
g.buffers = map[mtl.CommandBuffer][]mtl.Buffer{}
}
if _, ok := g.buffers[g.cb]; !ok {
g.cb.Retain()
}
g.buffers[g.cb] = append(g.buffers[g.cb], newBuf)
return newBuf
}
func (g *Graphics) SetVertices(vertices []float32, indices []uint32) error {
vbSize := unsafe.Sizeof(vertices[0]) * uintptr(len(vertices))
ibSize := unsafe.Sizeof(indices[0]) * uintptr(len(indices))
g.vb = g.availableBuffer(vbSize)
g.vb.CopyToContents(unsafe.Pointer(&vertices[0]), vbSize)
g.ib = g.availableBuffer(ibSize)
g.ib.CopyToContents(unsafe.Pointer(&indices[0]), ibSize)
return nil
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}
func (g *Graphics) flushIfNeeded(present bool) {
if g.cb == (mtl.CommandBuffer{}) && !present {
return
}
now := time.Now()
defer func() {
g.lastFlush = now
}()
g.flushRenderCommandEncoderIfNeeded()
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if present {
// This check is necessary when skipping to render the screen (SetScreenClearedEveryFrame(false)).
if g.screenDrawable == (ca.MetalDrawable{}) {
if g.cb != (mtl.CommandBuffer{}) {
g.screenDrawable = g.view.nextDrawable()
} else {
if delta := time.Second/60 - now.Sub(g.lastFlush); delta > 0 {
// nextDrawable can return immediately when the command buffer is empty.
// To avoid high CPU usage, sleep instead (#2520).
time.Sleep(delta)
}
}
}
if g.screenDrawable != (ca.MetalDrawable{}) {
g.cb.PresentDrawable(g.screenDrawable)
}
}
g.cb.Commit()
for _, t := range g.tmpTextures {
t.Release()
}
g.tmpTextures = g.tmpTextures[:0]
g.cb = mtl.CommandBuffer{}
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}
func (g *Graphics) checkSize(width, height int) {
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if width < 1 {
panic(fmt.Sprintf("metal: width (%d) must be equal or more than %d", width, 1))
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}
if height < 1 {
panic(fmt.Sprintf("metal: height (%d) must be equal or more than %d", height, 1))
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}
m := g.MaxImageSize()
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if width > m {
panic(fmt.Sprintf("metal: width (%d) must be less than or equal to %d", width, m))
}
if height > m {
panic(fmt.Sprintf("metal: height (%d) must be less than or equal to %d", height, m))
}
}
func (g *Graphics) genNextImageID() graphicsdriver.ImageID {
g.nextImageID++
return g.nextImageID
}
func (g *Graphics) genNextShaderID() graphicsdriver.ShaderID {
g.nextShaderID++
return g.nextShaderID
}
func (g *Graphics) NewImage(width, height int) (graphicsdriver.Image, error) {
g.checkSize(width, height)
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td := mtl.TextureDescriptor{
TextureType: mtl.TextureType2D,
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PixelFormat: mtl.PixelFormatRGBA8UNorm,
Width: graphics.InternalImageSize(width),
Height: graphics.InternalImageSize(height),
StorageMode: storageMode,
Usage: mtl.TextureUsageShaderRead | mtl.TextureUsageRenderTarget,
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}
t := g.view.getMTLDevice().MakeTexture(td)
i := &Image{
id: g.genNextImageID(),
graphics: g,
width: width,
height: height,
texture: t,
}
g.addImage(i)
return i, nil
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}
func (g *Graphics) NewScreenFramebufferImage(width, height int) (graphicsdriver.Image, error) {
g.view.setDrawableSize(width, height)
i := &Image{
id: g.genNextImageID(),
graphics: g,
width: width,
height: height,
screen: true,
}
g.addImage(i)
return i, nil
}
func (g *Graphics) addImage(img *Image) {
if g.images == nil {
g.images = map[graphicsdriver.ImageID]*Image{}
}
if _, ok := g.images[img.id]; ok {
panic(fmt.Sprintf("metal: image ID %d was already registered", img.id))
}
g.images[img.id] = img
}
func (g *Graphics) removeImage(img *Image) {
delete(g.images, img.id)
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}
func (g *Graphics) SetTransparent(transparent bool) {
g.transparent = transparent
}
func blendFactorToMetalBlendFactor(c graphicsdriver.BlendFactor) mtl.BlendFactor {
switch c {
case graphicsdriver.BlendFactorZero:
return mtl.BlendFactorZero
case graphicsdriver.BlendFactorOne:
return mtl.BlendFactorOne
case graphicsdriver.BlendFactorSourceColor:
return mtl.BlendFactorSourceColor
case graphicsdriver.BlendFactorOneMinusSourceColor:
return mtl.BlendFactorOneMinusSourceColor
case graphicsdriver.BlendFactorSourceAlpha:
return mtl.BlendFactorSourceAlpha
case graphicsdriver.BlendFactorOneMinusSourceAlpha:
return mtl.BlendFactorOneMinusSourceAlpha
case graphicsdriver.BlendFactorDestinationColor:
return mtl.BlendFactorDestinationColor
case graphicsdriver.BlendFactorOneMinusDestinationColor:
return mtl.BlendFactorOneMinusDestinationColor
case graphicsdriver.BlendFactorDestinationAlpha:
return mtl.BlendFactorDestinationAlpha
case graphicsdriver.BlendFactorOneMinusDestinationAlpha:
return mtl.BlendFactorOneMinusDestinationAlpha
case graphicsdriver.BlendFactorSourceAlphaSaturated:
return mtl.BlendFactorSourceAlphaSaturated
default:
panic(fmt.Sprintf("metal: invalid blend factor: %d", c))
}
}
func blendOperationToMetalBlendOperation(o graphicsdriver.BlendOperation) mtl.BlendOperation {
switch o {
case graphicsdriver.BlendOperationAdd:
return mtl.BlendOperationAdd
case graphicsdriver.BlendOperationSubtract:
return mtl.BlendOperationSubtract
case graphicsdriver.BlendOperationReverseSubtract:
return mtl.BlendOperationReverseSubtract
case graphicsdriver.BlendOperationMin:
return mtl.BlendOperationMin
case graphicsdriver.BlendOperationMax:
return mtl.BlendOperationMax
default:
panic(fmt.Sprintf("metal: invalid blend operation: %d", o))
}
}
func (g *Graphics) Initialize() error {
// Creating *State objects are expensive and reuse them whenever possible.
// See https://developer.apple.com/library/archive/documentation/Miscellaneous/Conceptual/MetalProgrammingGuide/Cmd-Submiss/Cmd-Submiss.html
for _, dss := range g.dsss {
dss.Release()
}
if g.dsss == nil {
g.dsss = map[stencilMode]mtl.DepthStencilState{}
}
if runtime.GOOS == "ios" {
// Initializing a Metal device and a layer must be done in the render thread on iOS.
if err := g.view.initialize(systemDefaultDevice); err != nil {
return err
}
}
if g.transparent {
g.view.ml.SetOpaque(false)
}
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// The stencil reference value is always 0 (default).
g.dsss[noStencil] = g.view.getMTLDevice().MakeDepthStencilState(mtl.DepthStencilDescriptor{
BackFaceStencil: mtl.StencilDescriptor{
StencilFailureOperation: mtl.StencilOperationKeep,
DepthFailureOperation: mtl.StencilOperationKeep,
DepthStencilPassOperation: mtl.StencilOperationKeep,
StencilCompareFunction: mtl.CompareFunctionAlways,
},
FrontFaceStencil: mtl.StencilDescriptor{
StencilFailureOperation: mtl.StencilOperationKeep,
DepthFailureOperation: mtl.StencilOperationKeep,
DepthStencilPassOperation: mtl.StencilOperationKeep,
StencilCompareFunction: mtl.CompareFunctionAlways,
},
})
g.dsss[incrementStencil] = g.view.getMTLDevice().MakeDepthStencilState(mtl.DepthStencilDescriptor{
BackFaceStencil: mtl.StencilDescriptor{
StencilFailureOperation: mtl.StencilOperationKeep,
DepthFailureOperation: mtl.StencilOperationKeep,
DepthStencilPassOperation: mtl.StencilOperationDecrementWrap,
StencilCompareFunction: mtl.CompareFunctionAlways,
},
FrontFaceStencil: mtl.StencilDescriptor{
StencilFailureOperation: mtl.StencilOperationKeep,
DepthFailureOperation: mtl.StencilOperationKeep,
DepthStencilPassOperation: mtl.StencilOperationIncrementWrap,
StencilCompareFunction: mtl.CompareFunctionAlways,
},
})
g.dsss[invertStencil] = g.view.getMTLDevice().MakeDepthStencilState(mtl.DepthStencilDescriptor{
BackFaceStencil: mtl.StencilDescriptor{
StencilFailureOperation: mtl.StencilOperationKeep,
DepthFailureOperation: mtl.StencilOperationKeep,
DepthStencilPassOperation: mtl.StencilOperationInvert,
StencilCompareFunction: mtl.CompareFunctionAlways,
},
FrontFaceStencil: mtl.StencilDescriptor{
StencilFailureOperation: mtl.StencilOperationKeep,
DepthFailureOperation: mtl.StencilOperationKeep,
DepthStencilPassOperation: mtl.StencilOperationInvert,
StencilCompareFunction: mtl.CompareFunctionAlways,
},
})
g.dsss[drawWithStencil] = g.view.getMTLDevice().MakeDepthStencilState(mtl.DepthStencilDescriptor{
BackFaceStencil: mtl.StencilDescriptor{
StencilFailureOperation: mtl.StencilOperationKeep,
DepthFailureOperation: mtl.StencilOperationKeep,
DepthStencilPassOperation: mtl.StencilOperationKeep,
StencilCompareFunction: mtl.CompareFunctionNotEqual,
},
FrontFaceStencil: mtl.StencilDescriptor{
StencilFailureOperation: mtl.StencilOperationKeep,
DepthFailureOperation: mtl.StencilOperationKeep,
DepthStencilPassOperation: mtl.StencilOperationKeep,
StencilCompareFunction: mtl.CompareFunctionNotEqual,
},
})
g.cq = g.view.getMTLDevice().MakeCommandQueue()
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return nil
}
func (g *Graphics) flushRenderCommandEncoderIfNeeded() {
if g.rce == (mtl.RenderCommandEncoder{}) {
return
}
g.rce.EndEncoding()
g.rce = mtl.RenderCommandEncoder{}
g.lastDst = nil
}
func (g *Graphics) draw(dst *Image, dstRegions []graphicsdriver.DstRegion, srcs [graphics.ShaderImageCount]*Image, indexOffset int, shader *Shader, uniforms [][]uint32, blend graphicsdriver.Blend, fillRule graphicsdriver.FillRule) error {
// When preparing a stencil buffer, flush the current render command encoder
// to make sure the stencil buffer is cleared when loading.
// TODO: What about clearing the stencil buffer by vertices?
if g.lastDst != dst || g.lastFillRule != fillRule || fillRule != graphicsdriver.FillAll {
g.flushRenderCommandEncoderIfNeeded()
}
g.lastDst = dst
g.lastFillRule = fillRule
if g.rce == (mtl.RenderCommandEncoder{}) {
rpd := mtl.RenderPassDescriptor{}
// Even though the destination pixels are not used, mtl.LoadActionDontCare might cause glitches
// (#1019). Always using mtl.LoadActionLoad is safe.
if dst.screen {
rpd.ColorAttachments[0].LoadAction = mtl.LoadActionClear
} else {
rpd.ColorAttachments[0].LoadAction = mtl.LoadActionLoad
}
// The store action should always be 'store' even for the screen (#1700).
rpd.ColorAttachments[0].StoreAction = mtl.StoreActionStore
t := dst.mtlTexture()
if t == (mtl.Texture{}) {
return nil
}
rpd.ColorAttachments[0].Texture = t
rpd.ColorAttachments[0].ClearColor = mtl.ClearColor{}
if fillRule != graphicsdriver.FillAll {
dst.ensureStencil()
rpd.StencilAttachment.LoadAction = mtl.LoadActionClear
rpd.StencilAttachment.StoreAction = mtl.StoreActionDontCare
rpd.StencilAttachment.Texture = dst.stencil
}
if g.cb == (mtl.CommandBuffer{}) {
g.cb = g.cq.MakeCommandBuffer()
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}
g.rce = g.cb.MakeRenderCommandEncoder(rpd)
}
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w, h := dst.internalSize()
g.rce.SetViewport(mtl.Viewport{
OriginX: 0,
OriginY: 0,
Width: float64(w),
Height: float64(h),
ZNear: -1,
ZFar: 1,
})
g.rce.SetVertexBuffer(g.vb, 0, 0)
for i, u := range uniforms {
if u == nil {
continue
}
g.rce.SetVertexBytes(unsafe.Pointer(&u[0]), unsafe.Sizeof(u[0])*uintptr(len(u)), i+1)
g.rce.SetFragmentBytes(unsafe.Pointer(&u[0]), unsafe.Sizeof(u[0])*uintptr(len(u)), i+1)
}
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for i, src := range srcs {
if src != nil {
g.rce.SetFragmentTexture(src.texture, i)
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} else {
g.rce.SetFragmentTexture(mtl.Texture{}, i)
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}
}
var (
noStencilRpss mtl.RenderPipelineState
incrementStencilRpss mtl.RenderPipelineState
invertStencilRpss mtl.RenderPipelineState
drawWithStencilRpss mtl.RenderPipelineState
)
switch fillRule {
case graphicsdriver.FillAll:
s, err := shader.RenderPipelineState(&g.view, blend, noStencil, dst.screen)
if err != nil {
return err
}
noStencilRpss = s
case graphicsdriver.NonZero:
s, err := shader.RenderPipelineState(&g.view, blend, incrementStencil, dst.screen)
if err != nil {
return err
}
incrementStencilRpss = s
case graphicsdriver.EvenOdd:
s, err := shader.RenderPipelineState(&g.view, blend, invertStencil, dst.screen)
if err != nil {
return err
}
invertStencilRpss = s
}
if fillRule != graphicsdriver.FillAll {
s, err := shader.RenderPipelineState(&g.view, blend, drawWithStencil, dst.screen)
if err != nil {
return err
}
drawWithStencilRpss = s
}
for _, dstRegion := range dstRegions {
g.rce.SetScissorRect(mtl.ScissorRect{
X: dstRegion.Region.Min.X,
Y: dstRegion.Region.Min.Y,
Width: dstRegion.Region.Dx(),
Height: dstRegion.Region.Dy(),
})
switch fillRule {
case graphicsdriver.FillAll:
g.rce.SetDepthStencilState(g.dsss[noStencil])
g.rce.SetRenderPipelineState(noStencilRpss)
g.rce.DrawIndexedPrimitives(mtl.PrimitiveTypeTriangle, dstRegion.IndexCount, mtl.IndexTypeUInt32, g.ib, indexOffset*int(unsafe.Sizeof(uint32(0))))
case graphicsdriver.NonZero:
g.rce.SetDepthStencilState(g.dsss[incrementStencil])
g.rce.SetRenderPipelineState(incrementStencilRpss)
g.rce.DrawIndexedPrimitives(mtl.PrimitiveTypeTriangle, dstRegion.IndexCount, mtl.IndexTypeUInt32, g.ib, indexOffset*int(unsafe.Sizeof(uint32(0))))
case graphicsdriver.EvenOdd:
g.rce.SetDepthStencilState(g.dsss[invertStencil])
g.rce.SetRenderPipelineState(invertStencilRpss)
g.rce.DrawIndexedPrimitives(mtl.PrimitiveTypeTriangle, dstRegion.IndexCount, mtl.IndexTypeUInt32, g.ib, indexOffset*int(unsafe.Sizeof(uint32(0))))
}
if fillRule != graphicsdriver.FillAll {
g.rce.SetDepthStencilState(g.dsss[drawWithStencil])
g.rce.SetRenderPipelineState(drawWithStencilRpss)
g.rce.DrawIndexedPrimitives(mtl.PrimitiveTypeTriangle, dstRegion.IndexCount, mtl.IndexTypeUInt32, g.ib, indexOffset*int(unsafe.Sizeof(uint32(0))))
}
indexOffset += dstRegion.IndexCount
}
return nil
}
func (g *Graphics) DrawTriangles(dstID graphicsdriver.ImageID, srcIDs [graphics.ShaderImageCount]graphicsdriver.ImageID, shaderID graphicsdriver.ShaderID, dstRegions []graphicsdriver.DstRegion, indexOffset int, blend graphicsdriver.Blend, uniforms []uint32, fillRule graphicsdriver.FillRule) error {
if shaderID == graphicsdriver.InvalidShaderID {
return fmt.Errorf("metal: shader ID is invalid")
}
dst := g.images[dstID]
if dst.screen {
g.view.update()
}
var srcs [graphics.ShaderImageCount]*Image
for i, srcID := range srcIDs {
srcs[i] = g.images[srcID]
}
uniformVars := make([][]uint32, len(g.shaders[shaderID].ir.Uniforms))
// Set the additional uniform variables.
var idx int
for i, t := range g.shaders[shaderID].ir.Uniforms {
if i == graphics.ProjectionMatrixUniformVariableIndex {
// In Metal, the NDC's Y direction (upward) and the framebuffer's Y direction (downward) don't
// match. Then, the Y direction must be inverted.
// Invert the sign bits as float32 values.
uniforms[idx+1] ^= 1 << 31
uniforms[idx+5] ^= 1 << 31
uniforms[idx+9] ^= 1 << 31
uniforms[idx+13] ^= 1 << 31
}
n := t.Uint32Count()
switch t.Main {
case shaderir.Vec3, shaderir.IVec3:
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// float3 requires 16-byte alignment (#2463).
v1 := make([]uint32, 4)
copy(v1[0:3], uniforms[idx:idx+3])
uniformVars[i] = v1
case shaderir.Mat3:
// float3x3 requires 16-byte alignment (#2036).
v1 := make([]uint32, 12)
copy(v1[0:3], uniforms[idx:idx+3])
copy(v1[4:7], uniforms[idx+3:idx+6])
copy(v1[8:11], uniforms[idx+6:idx+9])
uniformVars[i] = v1
case shaderir.Array:
switch t.Sub[0].Main {
case shaderir.Vec3, shaderir.IVec3:
v1 := make([]uint32, t.Length*4)
for j := 0; j < t.Length; j++ {
offset0 := j * 3
offset1 := j * 4
copy(v1[offset1:offset1+3], uniforms[idx+offset0:idx+offset0+3])
}
uniformVars[i] = v1
case shaderir.Mat3:
v1 := make([]uint32, t.Length*12)
for j := 0; j < t.Length; j++ {
offset0 := j * 9
offset1 := j * 12
copy(v1[offset1:offset1+3], uniforms[idx+offset0:idx+offset0+3])
copy(v1[offset1+4:offset1+7], uniforms[idx+offset0+3:idx+offset0+6])
copy(v1[offset1+8:offset1+11], uniforms[idx+offset0+6:idx+offset0+9])
}
uniformVars[i] = v1
default:
uniformVars[i] = uniforms[idx : idx+n]
}
default:
uniformVars[i] = uniforms[idx : idx+n]
}
idx += n
}
if err := g.draw(dst, dstRegions, srcs, indexOffset, g.shaders[shaderID], uniformVars, blend, fillRule); err != nil {
return err
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}
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return nil
}
func (g *Graphics) SetVsyncEnabled(enabled bool) {
g.view.setDisplaySyncEnabled(enabled)
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}
func (g *Graphics) NeedsClearingScreen() bool {
return false
}
func (g *Graphics) MaxImageSize() int {
if g.maxImageSize != 0 {
return g.maxImageSize
}
d := g.view.getMTLDevice()
// supportsFamily is available as of macOS 10.15+ and iOS 13.0+.
// https://developer.apple.com/documentation/metal/mtldevice/3143473-supportsfamily
if d.RespondsToSelector(objc.RegisterName("supportsFamily:")) {
// https://developer.apple.com/metal/Metal-Feature-Set-Tables.pdf
g.maxImageSize = 8192
switch {
case d.SupportsFamily(mtl.GPUFamilyApple3):
g.maxImageSize = 16384
case d.SupportsFamily(mtl.GPUFamilyMac2):
g.maxImageSize = 16384
}
return g.maxImageSize
}
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// supportsFeatureSet is deprecated but some old macOS/iOS versions support only this (#2553).
switch {
case d.SupportsFeatureSet(mtl.FeatureSet_iOS_GPUFamily5_v1):
g.maxImageSize = 16384
case d.SupportsFeatureSet(mtl.FeatureSet_iOS_GPUFamily4_v1):
g.maxImageSize = 16384
case d.SupportsFeatureSet(mtl.FeatureSet_iOS_GPUFamily3_v1):
g.maxImageSize = 16384
case d.SupportsFeatureSet(mtl.FeatureSet_iOS_GPUFamily2_v2):
g.maxImageSize = 8192
case d.SupportsFeatureSet(mtl.FeatureSet_iOS_GPUFamily2_v1):
g.maxImageSize = 4096
case d.SupportsFeatureSet(mtl.FeatureSet_iOS_GPUFamily1_v2):
g.maxImageSize = 8192
case d.SupportsFeatureSet(mtl.FeatureSet_iOS_GPUFamily1_v1):
g.maxImageSize = 4096
case d.SupportsFeatureSet(mtl.FeatureSet_tvOS_GPUFamily2_v1):
g.maxImageSize = 16384
case d.SupportsFeatureSet(mtl.FeatureSet_tvOS_GPUFamily1_v1):
g.maxImageSize = 8192
case d.SupportsFeatureSet(mtl.FeatureSet_macOS_GPUFamily1_v1):
g.maxImageSize = 16384
default:
panic("metal: there is no supported feature set")
}
return g.maxImageSize
}
func (g *Graphics) NewShader(program *shaderir.Program) (graphicsdriver.Shader, error) {
s, err := newShader(g.view.getMTLDevice(), g.genNextShaderID(), program)
if err != nil {
return nil, err
}
g.addShader(s)
return s, nil
}
func (g *Graphics) addShader(shader *Shader) {
if g.shaders == nil {
g.shaders = map[graphicsdriver.ShaderID]*Shader{}
}
if _, ok := g.shaders[shader.id]; ok {
panic(fmt.Sprintf("metal: shader ID %d was already registered", shader.id))
}
g.shaders[shader.id] = shader
}
func (g *Graphics) removeShader(shader *Shader) {
delete(g.shaders, shader.id)
}
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type Image struct {
id graphicsdriver.ImageID
graphics *Graphics
width int
height int
screen bool
texture mtl.Texture
stencil mtl.Texture
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}
func (i *Image) ID() graphicsdriver.ImageID {
return i.id
}
func (i *Image) internalSize() (int, int) {
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if i.screen {
return i.width, i.height
}
return graphics.InternalImageSize(i.width), graphics.InternalImageSize(i.height)
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}
func (i *Image) Dispose() {
if i.stencil != (mtl.Texture{}) {
i.stencil.Release()
i.stencil = mtl.Texture{}
}
if i.texture != (mtl.Texture{}) {
i.texture.Release()
i.texture = mtl.Texture{}
}
i.graphics.removeImage(i)
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}
func (i *Image) IsInvalidated() bool {
// TODO: Does Metal cause context lost?
// https://developer.apple.com/documentation/metal/mtlresource/1515898-setpurgeablestate
// https://developer.apple.com/documentation/metal/mtldevicenotificationhandler
return false
}
func (i *Image) syncTexture() {
i.graphics.flushRenderCommandEncoderIfNeeded()
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// Calling SynchronizeTexture is ignored on iOS (see mtl.m), but it looks like committing BlitCommandEncoder
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// is necessary (#1337).
if i.graphics.cb != (mtl.CommandBuffer{}) {
panic("metal: command buffer must be empty at syncTexture: flushIfNeeded is not called yet?")
}
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cb := i.graphics.cq.MakeCommandBuffer()
bce := cb.MakeBlitCommandEncoder()
bce.SynchronizeTexture(i.texture, 0, 0)
bce.EndEncoding()
cb.Commit()
// TODO: Are fences available here?
cb.WaitUntilCompleted()
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}
func (i *Image) ReadPixels(args []graphicsdriver.PixelsArgs) error {
i.graphics.flushIfNeeded(false)
i.syncTexture()
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for _, arg := range args {
if got, want := len(arg.Pixels), 4*arg.Region.Dx()*arg.Region.Dy(); got != want {
return fmt.Errorf("metal: len(buf) must be %d but %d at ReadPixels", want, got)
}
i.texture.GetBytes(&arg.Pixels[0], uintptr(4*arg.Region.Dx()), mtl.Region{
Origin: mtl.Origin{X: arg.Region.Min.X, Y: arg.Region.Min.Y},
Size: mtl.Size{Width: arg.Region.Dx(), Height: arg.Region.Dy(), Depth: 1},
}, 0)
}
return nil
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}
func (i *Image) WritePixels(args []graphicsdriver.PixelsArgs) error {
g := i.graphics
g.flushRenderCommandEncoderIfNeeded()
// Calculate the smallest texture size to include all the values in args.
var region image.Rectangle
for _, a := range args {
region = region.Union(a.Region)
}
// Use a temporary texture to send pixels asynchronously, whichever the memory is shared (e.g., iOS) or
// managed (e.g., macOS). A temporary texture is needed since ReplaceRegion tries to sync the pixel
// data between CPU and GPU, and doing it on the existing texture is inefficient (#1418).
// The texture cannot be reused until sending the pixels finishes, then create new ones for each call.
td := mtl.TextureDescriptor{
TextureType: mtl.TextureType2D,
PixelFormat: mtl.PixelFormatRGBA8UNorm,
Width: region.Dx(),
Height: region.Dy(),
StorageMode: storageMode,
Usage: mtl.TextureUsageShaderRead | mtl.TextureUsageRenderTarget,
}
t := g.view.getMTLDevice().MakeTexture(td)
g.tmpTextures = append(g.tmpTextures, t)
for _, a := range args {
t.ReplaceRegion(mtl.Region{
Origin: mtl.Origin{X: a.Region.Min.X - region.Min.X, Y: a.Region.Min.Y - region.Min.Y, Z: 0},
Size: mtl.Size{Width: a.Region.Dx(), Height: a.Region.Dy(), Depth: 1},
}, 0, unsafe.Pointer(&a.Pixels[0]), 4*a.Region.Dx())
}
if g.cb == (mtl.CommandBuffer{}) {
g.cb = i.graphics.cq.MakeCommandBuffer()
}
bce := g.cb.MakeBlitCommandEncoder()
for _, a := range args {
so := mtl.Origin{X: a.Region.Min.X - region.Min.X, Y: a.Region.Min.Y - region.Min.Y, Z: 0}
ss := mtl.Size{Width: a.Region.Dx(), Height: a.Region.Dy(), Depth: 1}
do := mtl.Origin{X: a.Region.Min.X, Y: a.Region.Min.Y, Z: 0}
bce.CopyFromTexture(t, 0, 0, so, ss, i.texture, 0, 0, do)
}
bce.EndEncoding()
return nil
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}
func (i *Image) mtlTexture() mtl.Texture {
if i.screen {
g := i.graphics
if g.screenDrawable == (ca.MetalDrawable{}) {
drawable := g.view.nextDrawable()
if drawable == (ca.MetalDrawable{}) {
return mtl.Texture{}
}
g.screenDrawable = drawable
// After nextDrawable, it is expected some command buffers are completed.
g.gcBuffers()
}
return g.screenDrawable.Texture()
}
return i.texture
}
func (i *Image) ensureStencil() {
if i.stencil != (mtl.Texture{}) {
return
}
td := mtl.TextureDescriptor{
TextureType: mtl.TextureType2D,
PixelFormat: mtl.PixelFormatStencil8,
Width: graphics.InternalImageSize(i.width),
Height: graphics.InternalImageSize(i.height),
StorageMode: mtl.StorageModePrivate,
Usage: mtl.TextureUsageRenderTarget,
}
i.stencil = i.graphics.view.getMTLDevice().MakeTexture(td)
}