mirror of https://github.com/Xaymar/obs-StreamFX
37 lines
1.2 KiB
Plaintext
37 lines
1.2 KiB
Plaintext
// AUTOGENERATED COPYRIGHT HEADER START
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// Copyright (C) 2021-2023 Michael Fabian 'Xaymar' Dirks <info@xaymar.com>
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// AUTOGENERATED COPYRIGHT HEADER END
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// Adapted from http://lolengine.net/blog/2013/07/27/rgb-to-hsv-in-glsl
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//#define RGB_HSV_FASTCONDITIONALMOVE
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float3 RGBtoHSV(float3 rgb) {
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const float4 K = float4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0);
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const float e = 1.0e-10;
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#ifdef RGB_HSV_FASTCONDITIONALMOVE
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float4 p = rgb.g < rgb.b ? float4(rgb.bg, K.wz) : float4(rgb.gb, K.xy);
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float4 q = rgb.r < p.x ? float4(p.xyw, rgb.r) : float4(rgb.r, p.yzx);
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#else
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float4 p = lerp(float4(rgb.bg, K.wz), float4(rgb.gb, K.xy), step(rgb.b, rgb.g));
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float4 q = lerp(float4(p.xyw, rgb.r), float4(rgb.r, p.yzx), step(p.x, rgb.r));
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#endif
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float d = q.x - min(q.w, q.y);
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return float3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x);
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}
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float4 RGBAtoHSVA(float4 rgba) {
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return float4(RGBtoHSV(rgba.rgb), rgba.a);
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}
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float3 HSVtoRGB(float3 hsv) {
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const float4 K = float4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
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float3 v = float3(0,0,0);
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v.rgb = hsv.z * lerp(K.xxx, clamp(abs(frac(hsv.xxx + K.xyz) * 6.0 - K.www) - K.xxx, 0.0, 1.0), hsv.y);
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return v;
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}
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float4 HSVAtoRGBA(float4 hsva) {
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return float4(HSVtoRGB(hsv.rgb), hsva.a);
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}
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