57 lines
979 B
Go
57 lines
979 B
Go
package gg
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import (
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"github.com/hajimehoshi/ebiten/v2"
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//"fmt"
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)
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type Shader = ebiten.Shader
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type ShaderOptions struct {
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Shader *Shader
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Uniforms map[string] any
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Images [4]*Image
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}
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var (
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// The shader is for example only.
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SolidWhiteColorShader = MustNewShader([]byte(`
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package main
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//var Random float
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func Fragment(dst vec4, src vec2, _ vec4) vec4 {
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c := imageSrc0UnsafeAt(src)
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size := imageSrc0Size()
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//ret := vec4(0.1) * src.x/size.x
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//ret := c * src.x/size.x
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//ret.r = 1
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//ret.a = c.a
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//c.a = 0
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//c.rg = vec2(0)
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//c.a = c.b
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//ret := vec4(1, 1, 1, 0)
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//ret.a /= 5
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//ret.a = src.x
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//c.a /= 5
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//c = vec4(c.a)
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orig := imageSrc0Origin()
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src -= orig
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c.a *= (size.x-src.x)/size.x
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return c
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}
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`))
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)
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func MustNewShader(src []byte) (*Shader) {
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shader, err := NewShader(src)
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if err != nil {
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panic(err)
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}
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return shader
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}
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func NewShader(src []byte) (*Shader, error) {
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return ebiten.NewShader(src)
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}
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