ebiten/examples/shader/radialblur.go

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// 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.
2021-06-24 14:49:37 +02:00
//go:build ignore
//kage:unit pixels
package main
var Time float
var Cursor vec2
func Fragment(dstPos vec4, srcPos vec2, color vec4) vec4 {
pos := dstPos.xy - imageDstOrigin()
dir := normalize(pos - Cursor)
clr := imageSrc2UnsafeAt(srcPos)
samples := [...]float{
-22, -14, -8, -4, -2, 2, 4, 8, 14, 22,
}
sum := clr
for i := 0; i < len(samples); i++ {
sum += imageSrc2At(srcPos + dir*samples[i])
}
sum /= 10 + 1
dist := distance(pos, Cursor)
t := clamp(dist/256, 0, 1)
return mix(clr, sum, t)
}