mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-14 15:07:26 +01:00
82 lines
2.1 KiB
Go
82 lines
2.1 KiB
Go
// Copyright 2022 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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package main
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import (
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"fmt"
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"image"
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"image/color"
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"log"
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"github.com/hajimehoshi/ebiten/v2"
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"github.com/hajimehoshi/ebiten/v2/ebitenutil"
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)
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const (
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cx = 32
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cy = 32
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)
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type Game struct {
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offscreen *ebiten.Image
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subImages [cx][cy]*ebiten.Image
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}
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func (g *Game) Update() error {
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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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if g.offscreen == nil {
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s := screen.Bounds().Size()
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g.offscreen = ebiten.NewImage(s.X, s.Y)
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}
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// Use various sub-images as rendering destination.
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// This is a proof-of-concept of efficient rendering with sub-images (#2232).
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sw, sh := screen.Bounds().Dx(), screen.Bounds().Dy()
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cw := sw / cx
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ch := sh / cy
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for j := 0; j < cy; j++ {
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for i := 0; i < cx; i++ {
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img := g.subImages[i][j]
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if img == nil {
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r := image.Rect(cw*i, ch*j, cw*(i+1), ch*(j+1))
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img = g.offscreen.SubImage(r).(*ebiten.Image)
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g.subImages[i][j] = img
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}
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// Rendering onto a sub image should be efficient,
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// but this is not efficient some environments like browsers (#2471).
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clr := color.RGBA{byte(0xff * float64(i) / cx), byte(0xff * float64(j) / cx), 0, 0xff}
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img.Fill(clr)
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}
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}
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screen.DrawImage(g.offscreen, nil)
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ebitenutil.DebugPrint(screen, fmt.Sprintf("FPS: %0.2f, TPS: %0.2f", ebiten.ActualFPS(), ebiten.ActualTPS()))
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}
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func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
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return 640, 480
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}
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func main() {
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ebiten.SetWindowTitle("Sub-images as rendering destinations (Ebitengine Demo)")
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if err := ebiten.RunGame(&Game{}); err != nil {
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log.Fatal(err)
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}
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}
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