ebiten/examples/address/main.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.
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//go:build example
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// +build example
package main
import (
"bytes"
"image"
_ "image/png"
"log"
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"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/ebitenutil"
"github.com/hajimehoshi/ebiten/v2/examples/resources/images"
)
const (
screenWidth = 640
screenHeight = 480
)
var ebitenImage *ebiten.Image
func init() {
// Decode an image from the image file's byte slice.
// Now the byte slice is generated with //go:generate for Go 1.15 or older.
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// If you use Go 1.16 or newer, it is strongly recommended to use //go:embed to embed the image file.
// See https://pkg.go.dev/embed for more details.
img, _, err := image.Decode(bytes.NewReader(images.Ebiten_png))
if err != nil {
log.Fatal(err)
}
ebitenImage = ebiten.NewImageFromImage(img)
}
func drawRect(screen *ebiten.Image, img *ebiten.Image, x, y, width, height float32, address ebiten.Address, msg string) {
sx, sy := -width/2, -height/2
vs := []ebiten.Vertex{
{
DstX: x,
DstY: y,
SrcX: sx,
SrcY: sy,
ColorR: 1,
ColorG: 1,
ColorB: 1,
ColorA: 1,
},
{
DstX: x + width,
DstY: y,
SrcX: sx + width,
SrcY: sy,
ColorR: 1,
ColorG: 1,
ColorB: 1,
ColorA: 1,
},
{
DstX: x,
DstY: y + height,
SrcX: sx,
SrcY: sy + height,
ColorR: 1,
ColorG: 1,
ColorB: 1,
ColorA: 1,
},
{
DstX: x + width,
DstY: y + height,
SrcX: sx + width,
SrcY: sy + height,
ColorR: 1,
ColorG: 1,
ColorB: 1,
ColorA: 1,
},
}
op := &ebiten.DrawTrianglesOptions{}
op.Address = address
screen.DrawTriangles(vs, []uint16{0, 1, 2, 1, 2, 3}, img, op)
ebitenutil.DebugPrintAt(screen, msg, int(x), int(y)-16)
}
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type Game struct{}
func (g *Game) Update() error {
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return nil
}
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func (g *Game) Draw(screen *ebiten.Image) {
const ox, oy = 40, 60
drawRect(screen, ebitenImage, ox, oy, 200, 100, ebiten.AddressClampToZero, "Regular")
drawRect(screen, ebitenImage, 220+ox, oy, 200, 100, ebiten.AddressRepeat, "Regular, Repeat")
subImage := ebitenImage.SubImage(image.Rect(10, 5, 20, 30)).(*ebiten.Image)
drawRect(screen, subImage, ox, 200+oy, 200, 100, ebiten.AddressClampToZero, "Subimage")
drawRect(screen, subImage, 220+ox, 200+oy, 200, 100, ebiten.AddressRepeat, "Subimage, Repeat")
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}
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
return screenWidth, screenHeight
}
func main() {
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ebiten.SetWindowSize(screenWidth, screenHeight)
ebiten.SetWindowTitle("Sampler Address (Ebiten Demo)")
if err := ebiten.RunGame(&Game{}); err != nil {
log.Fatal(err)
}
}