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29 lines
803 B
HLSL
29 lines
803 B
HLSL
#ifndef MATH_HLSLI
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#define MATH_HLSLI
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#define PI 3.1415926535897932384626433832795
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#define TWO_PI 6.283185307179586476925286766559
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#define PI_OVER_TWO 1.5707963267948966192313216916398
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#define PI_OVER_THREE 1.0471975511965977461542144610932
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#define PI_OVER_SIX 0.52359877559829887307710723054658
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#define ONE_OVER_PI 0.31830988618379067153776752674503
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#define TWO_OVER_PI 0.63661977236758134307553505349006
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#define ONE_OVER_TWO_PI 0.15915494309189533576888376337251
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float3 UnpackNormalXY(in float2 normal) {
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float3 result;
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result.xy = 2. * (normal - .5);
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result.z = sqrt(saturate(1. - dot(result.xy, result.xy)));
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return result;
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}
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float3 UnpackNormalXYZ(in float3 normal) {
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return normalize(normal - .5);
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}
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float InvLerp(float a, float b, float v) {
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return (v - a) / (b - a);
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}
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#endif
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