LYGIA Shader Library

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)

Check it on Github

#ifndef FNC_MIX
#define FNC_MIX

// Overloads for mixing two values
float mix(float a, float b, float pct) {
    return lerp(a, b, pct);
}

float2 mix(float2 a, float2 b, float pct) {
    return lerp(a, b, pct);
}

float3 mix(float3 a, float3 b, float pct) {
    return lerp(a, b, pct);
}

float4 mix(float4 a, float4 b, float pct) {
    return lerp(a, b, pct);
}

// Overloads for mixing three values
float mix(float a, float b, float c, float pct) {
    return lerp(lerp(a, b, 2. * pct), lerp(b, c, 2. * (max(pct, .5) - .5)), step(.5, pct));
}

float2 mix(float2 a, float2 b, float2 c, float pct) {
    return lerp(lerp(a, b, 2. * pct), lerp(b, c, 2. * (max(pct, .5) - .5)), step(.5, pct));
}

float3 mix(float3 a, float3 b, float3 c, float pct) {
    return lerp(lerp(a, b, 2. * pct), lerp(b, c, 2. * (max(pct, .5) - .5)), step(.5, pct));
}

float4 mix(float4 a, float4 b, float4 c, float pct) {
    return lerp(lerp(a, b, 2. * pct), lerp(b, c, 2. * (max(pct, .5) - .5)), step(.5, pct));
}

// Overloads for mixing four values
float mix(float a, float b, float c, float d, float pct) {
    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));
}

float2 mix(float2 a, float2 b, float2 c, float2 d, float pct) {
    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));
}

float3 mix(float3 a, float3 b, float3 c, float3 d, float pct) {
    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));
}

float4 mix(float4 a, float4 b, float4 c, float4 d, float pct) {
    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));
}

#endif

Dependencies:

• lygia/math/operations.hlsl

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)

Check it on Github

#ifndef FNC_MIX
#define FNC_MIX

inline __device__ __host__ float mix(float a, float b, float t) { return a + t*(b - a); }

inline __device__ __host__ float2 mix(const float2& a, const float2& b, float t) { return a + t*(b - a); }
inline __device__ __host__ float3 mix(const float3& a, const float3& b, float t) { return a + t*(b - a); }
inline __device__ __host__ float4 mix(const float4& a, const float4& b, float t) { return a + t*(b - a); }

inline __device__ __host__ float2 mix(const float2& a, const float2& b, const float2& t) { return a + t*(b - a); }
inline __device__ __host__ float3 mix(const float3& a, const float3& b, const float3& t) { return a + t*(b - a); }
inline __device__ __host__ float4 mix(const float4& a, const float4& b, const float4& t) { return a + t*(b - a); }

#endif