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Unity color conversion and uv-encoded color unpacking
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| #ifndef _COLOR | |
| #define _COLOR | |
| inline float3 hue2rgb(in float h) | |
| { | |
| float r = abs(h * 6 - 3) - 1; | |
| float g = 2 - abs(h * 6 - 2); | |
| float b = 2 - abs(h * 6 - 4); | |
| return saturate(float3(r, g, b)); | |
| } | |
| inline float rgbcv2hue(in float3 rgb, in float c, in float v) | |
| { | |
| float3 delta = (v - rgb) / c; | |
| delta.rgb -= delta.brg; | |
| delta.rgb += float3(2,4,6); | |
| delta.brg = step(v, rgb) * delta.brg; | |
| float h; | |
| h = max(delta.r, max(delta.g, delta.b)); | |
| return frac(h / 6); | |
| } | |
| inline float3 rgb2hsv(in float3 rgb) | |
| { | |
| float3 hsv = 0; | |
| hsv.z = max(rgb.r, max(rgb.g, rgb.b)); | |
| float m = min(rgb.r, min(rgb.g, rgb.b)); | |
| float c = hsv.z - m; | |
| if (c != 0) | |
| { | |
| hsv.x = rgbcv2hue(rgb, c, hsv.z); | |
| hsv.y = c / hsv.z; | |
| } | |
| return hsv; | |
| } | |
| inline float3 hsv2rgb(in float3 hsv) | |
| { | |
| float3 rgb = hue2rgb(hsv.x); | |
| return ((rgb - 1) * hsv.y + 1) * hsv.z; | |
| } | |
| inline float4 uv2rgba(in float2 uv) | |
| { | |
| float precision = 4096; | |
| float p = precision - 1; | |
| float4 c = half4(0, 0, 0, 0); | |
| c.r = floor(uv.x / precision) / p; | |
| c.g = fmod(uv.x, precision) / p; | |
| c.b = floor(uv.y / precision) / p; | |
| c.a = fmod(uv.y, precision) / p; | |
| return c; | |
| } | |
| #endif |
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