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70 lines
1.6 KiB
70 lines
1.6 KiB
2 years ago
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#ifndef SHADER_MATHS_INCLUDED
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#define SHADER_MATHS_INCLUDED
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#include "UnityCG.cginc"
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////////////////////////////////////////
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// Maths functions
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//
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inline half3 safeNormalize(half3 inVec)
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{
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half dp3 = max(0.001f, dot(inVec, inVec));
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return inVec * rsqrt(dp3);
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}
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inline float dotClamped(float3 a, float3 b)
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{
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#if (SHADER_TARGET < 30 || defined(SHADER_API_PS3))
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return saturate(dot(a, b));
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#else
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return max(0.0h, dot(a, b));
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#endif
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}
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inline float oneDividedBy(float value)
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{
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//Catches NANs
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float sign_value = sign(value);
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float sign_value_squared = sign_value*sign_value;
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return sign_value_squared / ( value + sign_value_squared - 1.0);
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}
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inline half pow5 (half x)
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{
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return x*x*x*x*x;
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}
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inline float4 quat_from_axis_angle(float3 axis, float angleRadians)
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{
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float4 qr;
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float half_angle = (angleRadians * 0.5);
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qr.x = axis.x * sin(half_angle);
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qr.y = axis.y * sin(half_angle);
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qr.z = axis.z * sin(half_angle);
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qr.w = cos(half_angle);
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return qr;
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}
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inline float3 rotate_vertex_position(float3 position, float3 axis, float angleRadians)
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{
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float4 q = quat_from_axis_angle(axis, angleRadians);
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float3 v = position.xyz;
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return v + 2.0 * cross(q.xyz, cross(q.xyz, v) + q.w * v);
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}
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float3 EncodeFloatRGB(float value)
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{
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const float max24int = 256*256*256-1;
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float3 decomp = floor( value * float3( max24int/(256*256), max24int/256, max24int ) ) / 255.0;
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decomp.z -= decomp.y * 256.0;
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decomp.y -= decomp.x * 256.0;
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return decomp;
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}
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float DecodeFloatRGB(float3 decomp)
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{
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return dot( decomp.xyz, float3( 255.0/256, 255.0/(256*256), 255.0/(256*256*256) ) );
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}
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#endif // SHADER_MATHS_INCLUDED
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