ebiten/examples/shader/radialblur.go
2020-08-11 23:51:22 +09:00

42 lines
1.1 KiB
Go

// 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 ignore
package main
var Time float
var Cursor vec2
var ScreenSize vec2
func Fragment(position vec4, texCoord vec2, color vec4) vec4 {
dir := normalize(position.xy - Cursor)
clr := image2TextureAt(texCoord)
samples := [...]float{
-22, -14, -8, -4, -2, 2, 4, 8, 14, 22,
}
// TODO: Add len(samples)
sum := clr
for i := 0; i < 10; i++ {
pos := texCoord + dir*samples[i]/imageSrcTextureSize()
sum += image2TextureBoundsAt(pos)
}
sum /= 10 + 1
dist := distance(position.xy, Cursor)
t := clamp(dist/256, 0, 1)
return mix(clr, sum, t)
}