mirror of
https://github.com/hajimehoshi/ebiten.git
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34 lines
1.1 KiB
Go
34 lines
1.1 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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center := ScreenSize / 2
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// Convert a pixel to a texel by dividing by the texture size.
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// TODO: This is confusing. Add a function to treat pixels (#1431).
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amount := (center - Cursor) / 10 / imageSrcTextureSize()
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var clr vec3
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clr.r = imageSrc2At(texCoord + amount).r
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clr.g = imageSrc2UnsafeAt(texCoord).g
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clr.b = imageSrc2At(texCoord - amount).b
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return vec4(clr, 1.0)
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}
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