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https://github.com/hajimehoshi/ebiten.git
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39688dd27d
WritePixels for 1x1 image is optimized at internal/ui, and Ebitengine doesn't read pixels from GPU in this case. Enlarge the tested image, and use DrawImage to ensure to invalidate the internal cache. Updates #2815
94 lines
1.9 KiB
Go
94 lines
1.9 KiB
Go
// Copyright 2023 The Ebitengine Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build ignore
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package main
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import (
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"fmt"
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"image/color"
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"time"
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"github.com/hajimehoshi/ebiten/v2"
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)
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type Game struct {
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init bool
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count int
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end0 chan struct{}
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end1 chan struct{}
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errCh chan error
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}
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func (g *Game) Update() error {
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if !g.init {
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g.end0 = make(chan struct{})
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g.end1 = make(chan struct{})
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g.errCh = make(chan error)
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src := ebiten.NewImage(1, 2)
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src.WritePixels([]byte{0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff})
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img := ebiten.NewImage(1, 2)
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go func() {
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t := time.Tick(time.Microsecond)
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loop:
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for {
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select {
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case <-t:
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// Call DrawImage every time in order to invalidate the internal pixels cache.
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img.DrawImage(src, nil)
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got := img.At(0, 0).(color.RGBA)
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want := color.RGBA{0xff, 0xff, 0xff, 0xff}
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if got != want {
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g.errCh <- fmt.Errorf("got: %v, want: %v", got, want)
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close(g.errCh)
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return
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}
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case <-g.end0:
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close(g.end1)
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break loop
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}
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}
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}()
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g.init = true
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}
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select {
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case err := <-g.errCh:
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return err
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default:
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}
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g.count++
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if g.count >= 60 {
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close(g.end0)
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<-g.end1
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return ebiten.Termination
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}
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return nil
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}
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func (g *Game) Draw(screen *ebiten.Image) {
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}
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func (g *Game) Layout(w, h int) (int, int) {
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return 320, 240
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}
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func main() {
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if err := ebiten.RunGame(&Game{}); err != nil {
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panic(err)
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}
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}
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