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internal/atlas: refactoring: ensure ReadPixels to be processed in a frame

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This enables to call (*Image).At from HandleInput, which might be
called outside of a frame.

Updates #1704
This commit is contained in:
Hajime Hoshi 2023-10-24 23:15:29 +09:00
parent a3ba83c5da
commit 55702a7c28
8 changed files with 135 additions and 170 deletions
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91
internal/atlas/func.go Normal file
View File

@ -0,0 +1,91 @@
// Copyright 2023 The Ebitengine 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 atlas
import (
"sync"
)
var (
deferred []func()
// deferredM is a mutex for the slice operations. This must not be used for other usages.
deferredM sync.Mutex
)
func appendDeferred(f func()) {
deferredM.Lock()
defer deferredM.Unlock()
deferred = append(deferred, f)
}
func flushDeferred() {
deferredM.Lock()
fs := deferred
deferred = nil
deferredM.Unlock()
for _, f := range fs {
f()
}
}
type funcsInFrame struct {
initOnce sync.Once
funcsCh chan func()
funcsAckCh chan struct{}
beginFrameCh chan struct{}
endFrameCh chan struct{}
endFrameAckCh chan struct{}
}
var theFuncsInFrame funcsInFrame
func (f *funcsInFrame) beginFrame() {
f.initOnce.Do(func() {
f.funcsCh = make(chan func())
f.funcsAckCh = make(chan struct{})
f.beginFrameCh = make(chan struct{})
f.endFrameCh = make(chan struct{})
f.endFrameAckCh = make(chan struct{})
go func() {
<-f.beginFrameCh
for {
select {
case fn := <-f.funcsCh:
fn()
f.funcsAckCh <- struct{}{}
case <-f.endFrameCh:
f.endFrameAckCh <- struct{}{}
// Wait for the next frame.
<-f.beginFrameCh
}
}
}()
})
f.beginFrameCh <- struct{}{}
}
func (f *funcsInFrame) endFrame() {
f.endFrameCh <- struct{}{}
// Ensure that all the queued functions are consumed and the loop is suspended.
<-f.endFrameAckCh
}
func (f *funcsInFrame) runFuncInFrame(fn func()) {
f.funcsCh <- fn
<-f.funcsAckCh
}

58
internal/atlas/image.go
View File

@ -48,17 +48,6 @@ func min(a, b int) int {
return b
}
func flushDeferred() {
deferredM.Lock()
fs := deferred
deferred = nil
deferredM.Unlock()
for _, f := range fs {
f()
}
}
// baseCountToPutOnSourceBackend represents the base time duration when the image can be put onto an atlas.
// Actual time duration is increased in an exponential way for each usage as a rendering target.
const baseCountToPutOnSourceBackend = 10
@ -132,11 +121,6 @@ var (
imagesToPutOnSourceBackend smallImageSet
imagesUsedAsDestination smallImageSet
deferred []func()
// deferredM is a mutex for the slice operations. This must not be used for other usages.
deferredM sync.Mutex
)
type ImageType int
@ -342,11 +326,9 @@ func (i *Image) DrawTriangles(srcs [graphics.ShaderImageCount]*Image, vertices [
us := make([]uint32, len(uniforms))
copy(us, uniforms)
deferredM.Lock()
deferred = append(deferred, func() {
appendDeferred(func() {
i.drawTriangles(srcs, vs, is, blend, dstRegion, srcRegions, shader, us, evenOdd, false)
})
deferredM.Unlock()
return
}
@ -463,11 +445,9 @@ func (i *Image) WritePixels(pix []byte, region image.Rectangle) {
copied := make([]byte, len(pix))
copy(copied, pix)
deferredM.Lock()
deferred = append(deferred, func() {
appendDeferred(func() {
i.writePixels(copied, region)
})
deferredM.Unlock()
return
}
@ -539,26 +519,30 @@ func (i *Image) writePixels(pix []byte, region image.Rectangle) {
i.backend.restorable.WritePixels(pixb, r)
}
func (i *Image) ReadPixels(graphicsDriver graphicsdriver.Graphics, pixels []byte, region image.Rectangle) (ok bool, err error) {
// ReadPixels reads pixels on the given region to the given slice pixels.
//
// ReadPixels blocks until BeginFrame is called if necessary in order to ensure this is called in a frame (between BeginFrame and EndFrame).
// Be careful not to cause a deadlock by blocking a BeginFrame call by this ReadPixels call.
func (i *Image) ReadPixels(graphicsDriver graphicsdriver.Graphics, pixels []byte, region image.Rectangle) error {
var err error
theFuncsInFrame.runFuncInFrame(func() {
err = i.readPixels(graphicsDriver, pixels, region)
})
return err
}
func (i *Image) readPixels(graphicsDriver graphicsdriver.Graphics, pixels []byte, region image.Rectangle) error {
backendsM.Lock()
defer backendsM.Unlock()
if !inFrame {
// Not ready to read pixels. Try this later.
return false, nil
panic("atlas: inFrame must be true in readPixels")
}
// In the tests, BeginFrame might not be called often and then images might not be disposed (#2292).
// To prevent memory leaks, flush the deferred functions here.
flushDeferred()
if err := i.readPixels(graphicsDriver, pixels, region); err != nil {
return false, err
}
return true, nil
}
func (i *Image) readPixels(graphicsDriver graphicsdriver.Graphics, pixels []byte, region image.Rectangle) error {
if i.backend == nil || i.backend.restorable == nil {
for i := range pixels {
pixels[i] = 0
@ -577,11 +561,9 @@ func (i *Image) readPixels(graphicsDriver graphicsdriver.Graphics, pixels []byte
// Defer this operation until it becomes safe. (#913)
func (i *Image) MarkDisposed() {
// As MarkDisposed can be invoked from finalizers, backendsM should not be used.
deferredM.Lock()
deferred = append(deferred, func() {
appendDeferred(func() {
i.dispose(true)
})
deferredM.Unlock()
}
func (i *Image) dispose(markDisposed bool) {
@ -757,6 +739,9 @@ func (i *Image) DumpScreenshot(graphicsDriver graphicsdriver.Graphics, path stri
}
func EndFrame() error {
// endFrame must be called outside of backendsM.
theFuncsInFrame.endFrame()
backendsM.Lock()
defer backendsM.Unlock()
defer func() {
@ -802,6 +787,9 @@ func floorPowerOf2(x int) int {
}
func BeginFrame(graphicsDriver graphicsdriver.Graphics) error {
// beginFrame must be called outside of backendsM.
defer theFuncsInFrame.beginFrame()
backendsM.Lock()
defer backendsM.Unlock()

54
internal/atlas/image_test.go
View File

@ -117,13 +117,9 @@ func TestEnsureIsolatedFromSourceBackend(t *testing.T) {
}
pix = make([]byte, 4*size*size)
ok, err := img4.ReadPixels(ui.Get().GraphicsDriverForTesting(), pix, image.Rect(0, 0, size, size))
if err != nil {
if err := img4.ReadPixels(ui.Get().GraphicsDriverForTesting(), pix, image.Rect(0, 0, size, size)); err != nil {
t.Fatal(err)
}
if !ok {
t.Fatal("ReadPixels failed")
}
for j := 0; j < size; j++ {
for i := 0; i < size; i++ {
r := pix[4*(size*j+i)]
@ -216,13 +212,9 @@ func TestReputOnSourceBackend(t *testing.T) {
atlas.PutImagesOnSourceBackendForTesting(ui.Get().GraphicsDriverForTesting())
pix = make([]byte, 4*size*size)
ok, err := img1.ReadPixels(ui.Get().GraphicsDriverForTesting(), pix, image.Rect(0, 0, size, size))
if err != nil {
if err := img1.ReadPixels(ui.Get().GraphicsDriverForTesting(), pix, image.Rect(0, 0, size, size)); err != nil {
t.Fatal(err)
}
if !ok {
t.Fatal("ReadPixels failed")
}
for j := 0; j < size; j++ {
for i := 0; i < size; i++ {
want := color.RGBA{R: byte(i + j), G: byte(i + j), B: byte(i + j), A: byte(i + j)}
@ -244,13 +236,9 @@ func TestReputOnSourceBackend(t *testing.T) {
}
pix = make([]byte, 4*size*size)
ok, err = img1.ReadPixels(ui.Get().GraphicsDriverForTesting(), pix, image.Rect(0, 0, size, size))
if err != nil {
if err := img1.ReadPixels(ui.Get().GraphicsDriverForTesting(), pix, image.Rect(0, 0, size, size)); err != nil {
t.Fatal(err)
}
if !ok {
t.Fatal("ReadPixels failed")
}
for j := 0; j < size; j++ {
for i := 0; i < size; i++ {
want := color.RGBA{R: byte(i + j), G: byte(i + j), B: byte(i + j), A: byte(i + j)}
@ -336,13 +324,9 @@ func TestExtend(t *testing.T) {
img1.WritePixels(p1, image.Rect(0, 0, w1, h1))
pix0 := make([]byte, 4*w0*h0)
ok, err := img0.ReadPixels(ui.Get().GraphicsDriverForTesting(), pix0, image.Rect(0, 0, w0, h0))
if err != nil {
if err := img0.ReadPixels(ui.Get().GraphicsDriverForTesting(), pix0, image.Rect(0, 0, w0, h0)); err != nil {
t.Fatal(err)
}
if !ok {
t.Fatal("ReadPixels failed")
}
for j := 0; j < h0; j++ {
for i := 0; i < w0; i++ {
r := pix0[4*(w0*j+i)]
@ -359,13 +343,9 @@ func TestExtend(t *testing.T) {
}
pix1 := make([]byte, 4*w1*h1)
ok, err = img1.ReadPixels(ui.Get().GraphicsDriverForTesting(), pix1, image.Rect(0, 0, w1, h1))
if err != nil {
if err := img1.ReadPixels(ui.Get().GraphicsDriverForTesting(), pix1, image.Rect(0, 0, w1, h1)); err != nil {
t.Fatal(err)
}
if !ok {
t.Fatal("ReadPixels failed")
}
for j := 0; j < h1; j++ {
for i := 0; i < w1; i++ {
r := pix1[4*(w1*j+i)]
@ -405,13 +385,9 @@ func TestWritePixelsAfterDrawTriangles(t *testing.T) {
dst.WritePixels(pix, image.Rect(0, 0, w, h))
pix = make([]byte, 4*w*h)
ok, err := dst.ReadPixels(ui.Get().GraphicsDriverForTesting(), pix, image.Rect(0, 0, w, h))
if err != nil {
if err := dst.ReadPixels(ui.Get().GraphicsDriverForTesting(), pix, image.Rect(0, 0, w, h)); err != nil {
t.Fatal(err)
}
if !ok {
t.Fatal("ReadPixels failed")
}
for j := 0; j < h; j++ {
for i := 0; i < w; i++ {
r := pix[4*(w*j+i)]
@ -451,13 +427,9 @@ func TestSmallImages(t *testing.T) {
dst.DrawTriangles([graphics.ShaderImageCount]*atlas.Image{src}, vs, is, graphicsdriver.BlendSourceOver, dr, [graphics.ShaderImageCount]image.Rectangle{}, atlas.NearestFilterShader, nil, false)
pix = make([]byte, 4*w*h)
ok, err := dst.ReadPixels(ui.Get().GraphicsDriverForTesting(), pix, image.Rect(0, 0, w, h))
if err != nil {
if err := dst.ReadPixels(ui.Get().GraphicsDriverForTesting(), pix, image.Rect(0, 0, w, h)); err != nil {
t.Fatal(err)
}
if !ok {
t.Fatal("ReadPixels failed")
}
for j := 0; j < h; j++ {
for i := 0; i < w; i++ {
r := pix[4*(w*j+i)]
@ -498,13 +470,9 @@ func TestLongImages(t *testing.T) {
dst.DrawTriangles([graphics.ShaderImageCount]*atlas.Image{src}, vs, is, graphicsdriver.BlendSourceOver, dr, [graphics.ShaderImageCount]image.Rectangle{}, atlas.NearestFilterShader, nil, false)
pix = make([]byte, 4*dstW*dstH)
ok, err := dst.ReadPixels(ui.Get().GraphicsDriverForTesting(), pix, image.Rect(0, 0, dstW, dstH))
if err != nil {
if err := dst.ReadPixels(ui.Get().GraphicsDriverForTesting(), pix, image.Rect(0, 0, dstW, dstH)); err != nil {
t.Fatal(err)
}
if !ok {
t.Fatal("ReadPixels failed")
}
for j := 0; j < h; j++ {
for i := 0; i < w*scale; i++ {
r := pix[4*(dstW*j+i)]
@ -716,13 +684,9 @@ func TestImageWritePixelsModify(t *testing.T) {
// Check the pixels are the original ones.
pix = make([]byte, 4*size*size)
ok, err := img.ReadPixels(ui.Get().GraphicsDriverForTesting(), pix, image.Rect(0, 0, size, size))
if err != nil {
if err := img.ReadPixels(ui.Get().GraphicsDriverForTesting(), pix, image.Rect(0, 0, size, size)); err != nil {
t.Fatal(err)
}
if !ok {
t.Fatal("ReadPixels failed")
}
for j := 0; j < size; j++ {
for i := 0; i < size; i++ {
want := color.RGBA{R: byte(i + j), G: byte(i + j), B: byte(i + j), A: byte(i + j)}

12
internal/atlas/shader_test.go
View File

@ -44,13 +44,9 @@ func TestShaderFillTwice(t *testing.T) {
dst.DrawTriangles([graphics.ShaderImageCount]*atlas.Image{}, vs, is, graphicsdriver.BlendCopy, dr, [graphics.ShaderImageCount]image.Rectangle{}, s1, nil, false)
pix := make([]byte, 4*w*h)
ok, err := dst.ReadPixels(g, pix, image.Rect(0, 0, w, h))
if err != nil {
if err := dst.ReadPixels(g, pix, image.Rect(0, 0, w, h)); err != nil {
t.Error(err)
}
if !ok {
t.Fatal("ReadPixels failed")
}
if got, want := (color.RGBA{R: pix[0], G: pix[1], B: pix[2], A: pix[3]}), (color.RGBA{R: 0x80, G: 0x80, B: 0x80, A: 0xff}); got != want {
t.Errorf("got: %v, want: %v", got, want)
}
@ -75,13 +71,9 @@ func TestImageDrawTwice(t *testing.T) {
dst.DrawTriangles([graphics.ShaderImageCount]*atlas.Image{src1}, vs, is, graphicsdriver.BlendCopy, dr, [graphics.ShaderImageCount]image.Rectangle{}, atlas.NearestFilterShader, nil, false)
pix := make([]byte, 4*w*h)
ok, err := dst.ReadPixels(ui.Get().GraphicsDriverForTesting(), pix, image.Rect(0, 0, w, h))
if err != nil {
if err := dst.ReadPixels(ui.Get().GraphicsDriverForTesting(), pix, image.Rect(0, 0, w, h)); err != nil {
t.Error(err)
}
if !ok {
t.Fatal("ReadPixels failed")
}
if got, want := (color.RGBA{R: pix[0], G: pix[1], B: pix[2], A: pix[3]}), (color.RGBA{R: 0x80, G: 0x80, B: 0x80, A: 0xff}); got != want {
t.Errorf("got: %v, want: %v", got, want)
}

19
internal/buffered/image.go
View File

@ -49,24 +49,19 @@ func (i *Image) MarkDisposed() {
i.img.MarkDisposed()
}
func (i *Image) ReadPixels(graphicsDriver graphicsdriver.Graphics, pixels []byte, region image.Rectangle) (ok bool, err error) {
func (i *Image) ReadPixels(graphicsDriver graphicsdriver.Graphics, pixels []byte, region image.Rectangle) error {
// If restorable.AlwaysReadPixelsFromGPU() returns false, the pixel data is cached in the restorable package.
if !restorable.AlwaysReadPixelsFromGPU() {
ok, err := i.img.ReadPixels(graphicsDriver, pixels, region)
if err != nil {
return false, err
if err := i.img.ReadPixels(graphicsDriver, pixels, region); err != nil {
return err
}
return ok, nil
return nil
}
if i.pixels == nil {
pix := make([]byte, 4*i.width*i.height)
ok, err := i.img.ReadPixels(graphicsDriver, pix, image.Rect(0, 0, i.width, i.height))
if err != nil {
return false, err
}
if !ok {
return false, nil
if err := i.img.ReadPixels(graphicsDriver, pix, image.Rect(0, 0, i.width, i.height)); err != nil {
return err
}
i.pixels = pix
}
@ -77,7 +72,7 @@ func (i *Image) ReadPixels(graphicsDriver graphicsdriver.Graphics, pixels []byte
srcX := 4 * ((region.Min.Y+j)*i.width + region.Min.X)
copy(pixels[dstX:dstX+lineWidth], i.pixels[srcX:srcX+lineWidth])
}
return true, nil
return nil
}
func (i *Image) DumpScreenshot(graphicsDriver graphicsdriver.Graphics, name string, blackbg bool) (string, error) {

2
internal/mipmap/mipmap.go
View File

@ -61,7 +61,7 @@ func (m *Mipmap) WritePixels(pix []byte, region image.Rectangle) {
m.disposeMipmaps()
}
func (m *Mipmap) ReadPixels(graphicsDriver graphicsdriver.Graphics, pixels []byte, region image.Rectangle) (ok bool, err error) {
func (m *Mipmap) ReadPixels(graphicsDriver graphicsdriver.Graphics, pixels []byte, region image.Rectangle) error {
return m.orig.ReadPixels(graphicsDriver, pixels, region)
}

39
internal/ui/context.go
View File

@ -58,14 +58,11 @@ type context struct {
skipCount int
setContextOnce sync.Once
funcsInFrameCh chan func()
}
func newContext(game Game) *context {
return &context{
game: game,
funcsInFrameCh: make(chan func()),
game: game,
}
}
@ -117,11 +114,6 @@ func (c *context) updateFrameImpl(graphicsDriver graphicsdriver.Graphics, update
}
}()
// Flush deferred functions, like reading pixels from GPU.
if err := c.processFuncsInFrame(ui); err != nil {
return err
}
// ForceUpdate can be invoked even if the context is not initialized yet (#1591).
if w, h := c.layoutGame(outsideWidth, outsideHeight, deviceScaleFactor); w == 0 || h == 0 {
return nil
@ -296,32 +288,3 @@ func (c *context) screenScaleAndOffsets() (scale, offsetX, offsetY float64) {
func (u *UserInterface) LogicalPositionToClientPosition(x, y float64) (float64, float64) {
return u.context.logicalPositionToClientPosition(x, y, u.DeviceScaleFactor())
}
func (c *context) runInFrame(f func()) {
ch := make(chan struct{})
c.funcsInFrameCh <- func() {
defer close(ch)
f()
}
<-ch
return
}
func (c *context) processFuncsInFrame(ui *UserInterface) error {
var processed bool
for {
select {
case f := <-c.funcsInFrameCh:
f()
processed = true
default:
if processed {
// Catch the error that happened at (*Image).At.
if err := ui.error(); err != nil {
return err
}
}
return nil
}
}
}

30
internal/ui/ui.go
View File

@ -120,35 +120,7 @@ func newUserInterface() (*UserInterface, error) {
}
func (u *UserInterface) readPixels(mipmap *mipmap.Mipmap, pixels []byte, region image.Rectangle) error {
ok, err := mipmap.ReadPixels(u.graphicsDriver, pixels, region)
if err != nil {
return err
}
// ReadPixels failed since this was called in between two frames.
// Try this again at the next frame.
if !ok {
// If this function is called from the same sequence as a game's Update and Draw,
// this causes a dead lock.
// This never happens so far, but if handling inputs after EndFrame is implemented,
// this might be possible (#1704).
var err1 error
u.context.runInFrame(func() {
ok, err := mipmap.ReadPixels(u.graphicsDriver, pixels, region)
if err != nil {
err1 = err
return
}
if !ok {
// This never reaches since this function must be called in a frame.
panic("ui: ReadPixels unexpectedly failed")
}
})
return err1
}
return nil
return mipmap.ReadPixels(u.graphicsDriver, pixels, region)
}
func (u *UserInterface) dumpScreenshot(mipmap *mipmap.Mipmap, name string, blackbg bool) (string, error) {