mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-26 11:48:55 +01:00
35 lines
1.1 KiB
Go
35 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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srcOrigin, srcSize := imageSrcRegionOnTexture()
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pos := (texCoord - srcOrigin) / srcSize
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pos *= ScreenSize
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lightpos := vec3(Cursor, 50)
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lightdir := normalize(lightpos - vec3(pos, 0))
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normal := normalize(imageSrc1UnsafeAt(texCoord) - 0.5)
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const ambient = 0.25
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diffuse := 0.75 * max(0.0, dot(normal.xyz, lightdir))
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return imageSrc0UnsafeAt(texCoord) * (ambient + diffuse)
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}
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