2020-05-29 21:36:24 +02:00
|
|
|
// Copyright 2020 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.
|
|
|
|
|
|
|
|
// +build example jsgo
|
|
|
|
|
|
|
|
package main
|
|
|
|
|
|
|
|
import (
|
|
|
|
"log"
|
|
|
|
|
|
|
|
"github.com/hajimehoshi/ebiten"
|
|
|
|
)
|
|
|
|
|
|
|
|
const (
|
|
|
|
screenWidth = 640
|
|
|
|
screenHeight = 480
|
|
|
|
)
|
|
|
|
|
|
|
|
const shaderSrc = `package main
|
|
|
|
|
2020-06-10 17:29:01 +02:00
|
|
|
var Time float
|
|
|
|
|
2020-06-10 16:07:57 +02:00
|
|
|
// viewportSize is a predefined function.
|
2020-06-04 20:00:43 +02:00
|
|
|
|
2020-05-29 21:36:24 +02:00
|
|
|
func Vertex(position vec2, texCoord vec2, color vec4) vec4 {
|
|
|
|
return mat4(
|
2020-06-10 16:07:57 +02:00
|
|
|
2.0/viewportSize().x, 0, 0, 0,
|
|
|
|
0, 2.0/viewportSize().y, 0, 0,
|
2020-05-29 21:36:24 +02:00
|
|
|
0, 0, 1, 0,
|
|
|
|
-1, -1, 0, 1,
|
|
|
|
) * vec4(position, 0, 1)
|
|
|
|
}
|
|
|
|
|
|
|
|
func Fragment(position vec4) vec4 {
|
2020-06-10 17:29:01 +02:00
|
|
|
pos := position.xy / viewportSize()
|
|
|
|
color := 0.0
|
|
|
|
color += sin(pos.x * cos(Time / 15.0) * 80.0) + cos(pos.y * cos(Time / 15.0) * 10.0)
|
|
|
|
color += sin(pos.y * sin(Time / 10.0) * 40.0) + cos(pos.x * sin(Time / 25.0) * 40.0)
|
|
|
|
color += sin(pos.x * sin(Time / 5.0) * 10.0) + sin(pos.y * sin(Time / 35.0) * 80.0)
|
|
|
|
color *= sin(Time / 10.0) * 0.5
|
|
|
|
return vec4(color, color * 0.5, sin(color + Time / 3.0 ) * 0.75, 1.0)
|
2020-05-29 21:36:24 +02:00
|
|
|
}`
|
|
|
|
|
|
|
|
type Game struct {
|
|
|
|
shader *ebiten.Shader
|
2020-06-10 17:29:01 +02:00
|
|
|
time int
|
2020-05-29 21:36:24 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
func (g *Game) Update(screen *ebiten.Image) error {
|
2020-06-10 17:29:01 +02:00
|
|
|
g.time++
|
2020-05-29 21:36:24 +02:00
|
|
|
if g.shader == nil {
|
|
|
|
var err error
|
|
|
|
g.shader, err = ebiten.NewShader([]byte(shaderSrc))
|
|
|
|
if err != nil {
|
|
|
|
return err
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
func (g *Game) Draw(screen *ebiten.Image) {
|
|
|
|
w, h := screen.Size()
|
|
|
|
vs := []ebiten.Vertex{
|
|
|
|
{
|
|
|
|
DstX: 0,
|
|
|
|
DstY: 0,
|
|
|
|
},
|
|
|
|
{
|
|
|
|
DstX: float32(w),
|
|
|
|
DstY: 0,
|
|
|
|
},
|
|
|
|
{
|
|
|
|
DstX: 0,
|
|
|
|
DstY: float32(h),
|
|
|
|
},
|
|
|
|
{
|
|
|
|
DstX: float32(w),
|
|
|
|
DstY: float32(h),
|
|
|
|
},
|
|
|
|
}
|
|
|
|
is := []uint16{0, 1, 2, 1, 2, 3}
|
2020-06-10 17:29:01 +02:00
|
|
|
|
|
|
|
op := &ebiten.DrawTrianglesWithShaderOptions{}
|
|
|
|
op.Uniforms = []interface{}{
|
|
|
|
float32(g.time) / 60, // time
|
|
|
|
}
|
|
|
|
screen.DrawTrianglesWithShader(vs, is, g.shader, op)
|
2020-05-29 21:36:24 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
|
|
|
|
return screenWidth, screenHeight
|
|
|
|
}
|
|
|
|
|
|
|
|
func main() {
|
|
|
|
ebiten.SetWindowSize(screenWidth, screenHeight)
|
|
|
|
ebiten.SetWindowTitle("Shader (Ebiten Demo)")
|
|
|
|
if err := ebiten.RunGame(&Game{}); err != nil {
|
|
|
|
log.Fatal(err)
|
|
|
|
}
|
|
|
|
}
|