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30 lines
1.1 KiB
Go
30 lines
1.1 KiB
Go
package postfx
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import (
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"aego/core/mathx"
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"aego/render/shader"
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)
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const VignetteID = "postfx.vignette"
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func vignette() Descriptor {
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return Descriptor{
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ID: VignetteID, Label: "Vignette", Version: 1, Phase: DisplayLinear, Alpha: PreserveCoverage,
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Fields: []Field{
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{Name: "Intensity", Kind: shader.KindFloat, Default: Parameter{Value: mathx.Vec4{X: .35}}, Bounded: true, Max: 1},
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{Name: "Center", Kind: shader.KindVec2, Default: Parameter{Value: mathx.Vec4{X: .5, Y: .5}}, Bounded: true, Max: 1},
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{Name: "Softness", Kind: shader.KindFloat, Default: Parameter{Value: mathx.Vec4{X: .65}}, Bounded: true, Max: 1},
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},
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Neutral: func(p [4][4]float32) bool { return p[0][0] == 0 },
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Fragment: `
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vec4 aego_effect(vec4 inputColor, vec2 localUV, vec2 outputSize, vec4 params[4]) {
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vec2 delta = (localUV - params[1].xy) * outputSize;
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float radius = 2.0 * length(delta) / max(1.0, min(outputSize.x, outputSize.y));
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float softness = params[2].x;
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float edge = softness > 0.0 ? smoothstep(1.0 - softness, 1.0, radius) : step(1.0, radius);
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return vec4(inputColor.rgb * (1.0 - params[0].x * edge), inputColor.a);
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}
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`,
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}
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}
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