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https://github.com/hajimehoshi/ebiten.git
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42 lines
1.3 KiB
Go
42 lines
1.3 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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// Specify the 'pixel' mode.
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//kage:unit pixels
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package main
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// Uniform variables.
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var Time float
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var Cursor vec2
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// Fragment is the entry point of the fragment shader.
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// Fragment returns the color value for the current position.
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func Fragment(dstPos vec4, srcPos vec2, color vec4) vec4 {
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// You can define variables with a short variable declaration like Go.
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pos := dstPos.xy - imageDstOrigin()
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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(srcPos) - 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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// You can treat multiple source images by
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// imageSrc[N]At or imageSrc[N]UnsafeAt.
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return imageSrc0UnsafeAt(srcPos) * (ambient + diffuse)
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}
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