mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-15 07:27:32 +01:00
4b1ae72f59
Mipmaps could be unexpectedly expensive even when we don't need mipmaps. In order to improve performance, let's add an option to disable mipmaps. Closes #3095
130 lines
3.2 KiB
Go
130 lines
3.2 KiB
Go
// 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.
|
|
|
|
// This example is an experiment to minify images with various filters.
|
|
// When linear filter is used, mipmap images should be used for high-quality rendering (#578).
|
|
|
|
package main
|
|
|
|
import (
|
|
"bytes"
|
|
"fmt"
|
|
"image"
|
|
_ "image/jpeg"
|
|
"log"
|
|
"math"
|
|
|
|
"github.com/hajimehoshi/ebiten/v2"
|
|
"github.com/hajimehoshi/ebiten/v2/ebitenutil"
|
|
"github.com/hajimehoshi/ebiten/v2/examples/resources/images"
|
|
"github.com/hajimehoshi/ebiten/v2/inpututil"
|
|
)
|
|
|
|
const (
|
|
screenWidth = 1000
|
|
screenHeight = 480
|
|
)
|
|
|
|
var (
|
|
gophersImage *ebiten.Image
|
|
)
|
|
|
|
type Game struct {
|
|
rotate bool
|
|
clip bool
|
|
counter int
|
|
pause bool
|
|
}
|
|
|
|
func (g *Game) Update() error {
|
|
if inpututil.IsKeyJustPressed(ebiten.KeyR) {
|
|
g.rotate = !g.rotate
|
|
}
|
|
if inpututil.IsKeyJustPressed(ebiten.KeyC) {
|
|
g.clip = !g.clip
|
|
}
|
|
if inpututil.IsMouseButtonJustPressed(ebiten.MouseButtonLeft) {
|
|
g.pause = !g.pause
|
|
}
|
|
|
|
if g.pause {
|
|
return nil
|
|
}
|
|
|
|
g.counter++
|
|
if g.counter == 480 {
|
|
g.counter = 0
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (g *Game) Draw(screen *ebiten.Image) {
|
|
s := 1.5 / math.Pow(1.01, float64(g.counter))
|
|
|
|
clippedGophersImage := gophersImage.SubImage(image.Rect(100, 100, 200, 200)).(*ebiten.Image)
|
|
for i := range 3 {
|
|
//for i, f := range []ebiten.Filter{ebiten.FilterNearest, ebiten.FilterLinear} {
|
|
w, h := gophersImage.Bounds().Dx(), gophersImage.Bounds().Dy()
|
|
|
|
op := &ebiten.DrawImageOptions{}
|
|
if g.rotate {
|
|
op.GeoM.Translate(-float64(w)/2, -float64(h)/2)
|
|
op.GeoM.Rotate(float64(g.counter) / 300 * 2 * math.Pi)
|
|
op.GeoM.Translate(float64(w)/2, float64(h)/2)
|
|
}
|
|
op.GeoM.Scale(s, s)
|
|
op.GeoM.Translate(32+float64(i*w)*s+float64(i*4), 100)
|
|
if i == 0 {
|
|
op.Filter = ebiten.FilterNearest
|
|
} else {
|
|
op.Filter = ebiten.FilterLinear
|
|
}
|
|
if i == 2 {
|
|
op.DisableMipmaps = true
|
|
}
|
|
if g.clip {
|
|
screen.DrawImage(clippedGophersImage, op)
|
|
} else {
|
|
screen.DrawImage(gophersImage, op)
|
|
}
|
|
}
|
|
|
|
msg := fmt.Sprintf(`Minifying images (Nearest filter, Linear filter (w/ mipmaps), and Linear Filter (w/o mipmaps)):
|
|
Press R to rotate the images.
|
|
Press C to clip the images.
|
|
Click to pause and resume.
|
|
Scale: %0.2f`, s)
|
|
ebitenutil.DebugPrint(screen, msg)
|
|
}
|
|
|
|
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
|
|
return screenWidth, screenHeight
|
|
}
|
|
|
|
func main() {
|
|
// Decode an image from the image file's byte slice.
|
|
img, _, err := image.Decode(bytes.NewReader(images.Gophers_jpg))
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
|
|
gophersImage = ebiten.NewImageFromImage(img)
|
|
|
|
ebiten.SetWindowSize(screenWidth, screenHeight)
|
|
ebiten.SetWindowTitle("Minify (Ebitengine Demo)")
|
|
if err := ebiten.RunGame(&Game{}); err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
}
|