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utils: pxrad: some math functions for patch aa #256

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Merged
SNMetamorph merged 2 commits into from
Nov 17, 2025
Merged

utils: pxrad: some math functions for patch aa #256

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11abb76
utils: pxrad: mathlib.cpp some math functions for patch aa
ncuxonaT Nov 17, 2025
7168e54
utils: pxrad: mathlib.h some math functions for patch aa
ncuxonaT Nov 17, 2025
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33 changes: 33 additions & 0 deletions utils/common/mathlib.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -235,6 +235,20 @@ float Atan2Fast( float y, float x )
return res;
}

/*
=================
TriangleArea
=================
*/
vec_t TriangleArea( const vec3_t a, const vec3_t b, const vec3_t c )
{
vec3_t ba, ca, cro;
VectorSubtract( b, a, ba );
VectorSubtract( c, a, ca );
CrossProduct( ba, ca, cro );
return 0.5f * VectorLength( cro );
}

/*
=================
TriangleIncenter
Expand Down Expand Up @@ -284,6 +298,25 @@ void TangentToWorld( const vec3_t v, const vec3_t t, const vec3_t b, const vec3_
out[2] = v[0] * t[2] + v[1] * b[2] + v[2] * n[2];
}

/*
=================
Halton
=================
*/
float Halton(int base, int index)
{
float result = 0.0f;
float f = 1.0f;
while (index > 0)
{
f = f / float(base);
result += f * float(index % base);
index = index / base;
}
return result;
}


/*
==============
ColorNormalize
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2 changes: 2 additions & 0 deletions utils/common/mathlib.h
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Expand Up @@ -255,9 +255,11 @@ float HalfToFloat( unsigned short h );

float AcosFast( float x );
float Atan2Fast( float y, float x );
vec_t TriangleArea( const vec3_t a, const vec3_t b, const vec3_t c );
void TriangleIncenter( const vec3_t a, const vec3_t b, const vec3_t c, vec3_t out );
void WorldToTangent( const vec3_t v, const vec3_t t, const vec3_t b, const vec3_t n, vec3_t out );
void TangentToWorld( const vec3_t v, const vec3_t t, const vec3_t b, const vec3_t n, vec3_t out );
float Halton(int base, int index);

//
// Bounding Box operations
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