mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-13 22:47:26 +01:00
36 lines
1.0 KiB
Go
36 lines
1.0 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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// +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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// Triangle wave to go 0-->1-->0...
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limit := abs(2*fract(Time/3) - 1)
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level := imageSrc3UnsafeAt(texCoord).x
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// Add a white border
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if limit-0.1 < level && level < limit {
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alpha := imageSrc0UnsafeAt(texCoord).w
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return vec4(alpha)
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}
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return step(limit, level) * imageSrc0UnsafeAt(texCoord)
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}
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