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examples/shader: Add mouse cursor

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This commit is contained in:
Hajime Hoshi 2020-06-22 00:47:53 +09:00
parent f10263fff7
commit d0df5950b5
1 changed files with 7 additions and 3 deletions
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10
examples/shader/main.go
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@ -29,7 +29,8 @@ const (
const shaderSrc = `package main
var Time float
var Time float
var Mouse vec2
// viewportSize is a predefined function.
@ -43,7 +44,7 @@ func Vertex(position vec2, texCoord vec2, color vec4) vec4 {
}
func Fragment(position vec4) vec4 {
pos := position.xy / viewportSize()
pos := position.xy / viewportSize() + Mouse / viewportSize() / 4
color := 0.0
color += sin(pos.x * cos(Time / 15) * 80) + cos(pos.y * cos(Time / 15) * 10)
color += sin(pos.y * sin(Time / 10) * 40) + cos(pos.x * sin(Time / 25) * 40)
@ -91,9 +92,12 @@ func (g *Game) Draw(screen *ebiten.Image) {
}
is := []uint16{0, 1, 2, 1, 2, 3}
cx, cy := ebiten.CursorPosition()
op := &ebiten.DrawTrianglesWithShaderOptions{}
op.Uniforms = []interface{}{
float32(g.time) / 60, // time
float32(g.time) / 60, // time
[]float32{float32(cx), float32(cy)}, // cursor
}
screen.DrawTrianglesWithShader(vs, is, g.shader, op)
}