mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-26 11:48:55 +01:00
45 lines
1.2 KiB
Go
45 lines
1.2 KiB
Go
// Copyright 2020 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build ignore
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package main
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var Time float
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var Cursor vec2
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var ScreenSize vec2
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func Fragment(position vec4, texCoord vec2, color vec4) vec4 {
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srcOrigin, srcSize := imageSrcRegionOnTexture()
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pos := (texCoord - srcOrigin) / srcSize
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pos *= ScreenSize
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dir := normalize(pos - Cursor)
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clr := imageSrc2UnsafeAt(texCoord)
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samples := [...]float{
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-22, -14, -8, -4, -2, 2, 4, 8, 14, 22,
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}
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sum := clr
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for i := 0; i < len(samples); i++ {
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pos := texCoord + dir*samples[i]/imageSrcTextureSize()
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sum += imageSrc2At(pos)
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}
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sum /= 10 + 1
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dist := distance(pos, Cursor)
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t := clamp(dist/256, 0, 1)
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return mix(clr, sum, t)
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}
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