Created
July 27, 2018 06:18
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shader: HSV <-> RGB
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// https://blog.csdn.net/mobilebbki399/article/details/50603461 | |
float3 RGB2HSV(float3 c) | |
{ | |
float4 K = float4(0.0, -1.0 / 3.0, 2.0 / 3.0, -1.0); | |
float4 p = lerp(float4(c.bg, K.wz), float4(c.gb, K.xy), step(c.b, c.g)); | |
float4 q = lerp(float4(p.xyw, c.r), float4(c.r, p.yzx), step(p.x, c.r)); | |
float d = q.x - min(q.w, q.y); | |
float e = 1.0e-10; | |
return float3(abs(q.z + (q.w - q.y) / (6.0 * d + e)), d / (q.x + e), q.x); | |
} | |
float3 HSV2RGB(float3 c) | |
{ | |
float4 K = float4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0); | |
float3 p = abs(frac(c.xxx + K.xyz) * 6.0 - K.www); | |
return c.z * lerp(K.xxx, saturate(p - K.xxx), c.y); | |
} |
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