64 lines
2.3 KiB
HLSL
64 lines
2.3 KiB
HLSL
/*
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contributors: Patricio Gonzalez Vivo
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description: expands mix to linearly mix more than two values
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use: <float|float2|float3|float4> mix(<float|float2|float3|float4> a, <float|float2|float3|float4> b, <float|float2|float3|float4> c [, <float|float2|float3|float4> d], <float> pct)
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license:
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- Copyright (c) 2021 Patricio Gonzalez Vivo under Prosperity License - https://prosperitylicense.com/versions/3.0.0
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- Copyright (c) 2021 Patricio Gonzalez Vivo under Patron License - https://lygia.xyz/license
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*/
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#ifndef FNC_MIX
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#define FNC_MIX
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// Overloads for mixing two values
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float mix(float a, float b, float pct) {
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return lerp(a, b, pct);
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}
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float2 mix(float2 a, float2 b, float pct) {
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return lerp(a, b, pct);
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}
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float3 mix(float3 a, float3 b, float pct) {
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return lerp(a, b, pct);
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}
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float4 mix(float4 a, float4 b, float pct) {
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return lerp(a, b, pct);
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}
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// Overloads for mixing three values
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float mix(float a, float b, float c, float pct) {
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return lerp(lerp(a, b, 2. * pct), lerp(b, c, 2. * (max(pct, .5) - .5)), step(.5, pct));
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}
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float2 mix(float2 a, float2 b, float2 c, float pct) {
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return lerp(lerp(a, b, 2. * pct), lerp(b, c, 2. * (max(pct, .5) - .5)), step(.5, pct));
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}
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float3 mix(float3 a, float3 b, float3 c, float pct) {
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return lerp(lerp(a, b, 2. * pct), lerp(b, c, 2. * (max(pct, .5) - .5)), step(.5, pct));
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}
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float4 mix(float4 a, float4 b, float4 c, float pct) {
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return lerp(lerp(a, b, 2. * pct), lerp(b, c, 2. * (max(pct, .5) - .5)), step(.5, pct));
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}
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// Overloads for mixing four values
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float mix(float a, float b, float c, float d, float pct) {
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return lerp(lerp(a, b, 3. * pct), lerp(b, lerp(c, d, 3. * (max(pct, .66) - .66)), 3. * (clamp(pct, .33, .66) - .33)), step(.33, pct));
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}
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float2 mix(float2 a, float2 b, float2 c, float2 d, float pct) {
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return lerp(lerp(a, b, 3. * pct), lerp(b, lerp(c, d, 3. * (max(pct, .66) - .66)), 3. * (clamp(pct, .33, .66) - .33)), step(.33, pct));
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}
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float3 mix(float3 a, float3 b, float3 c, float3 d, float pct) {
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return lerp(lerp(a, b, 3. * pct), lerp(b, lerp(c, d, 3. * (max(pct, .66) - .66)), 3. * (clamp(pct, .33, .66) - .33)), step(.33, pct));
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}
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float4 mix(float4 a, float4 b, float4 c, float4 d, float pct) {
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return lerp(lerp(a, b, 3. * pct), lerp(b, lerp(c, d, 3. * (max(pct, .66) - .66)), 3. * (clamp(pct, .33, .66) - .33)), step(.33, pct));
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}
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#endif
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