Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses
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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose: Math functions specific to the editor.
//
//===========================================================================//
#ifndef HAMMER_MATHLIB_H
#define HAMMER_MATHLIB_H
#ifdef _WIN32
#pragma once
#endif
typedef unsigned char byte;
#include "mathlib/mathlib.h"
#include "mathlib/vmatrix.h"
#include <math.h>
typedef vec_t vec5_t[5];
enum
{
AXIS_X = 0,
AXIS_Y,
AXIS_Z
};
//
// Matrix functions:
//
void RotateAroundAxis(VMatrix& Matrix, float fDegrees, int nAxis);
void AxisAngleMatrix(VMatrix& Matrix, const Vector &Axis, float fAngle);
float fixang(float a);
float lineangle(float x1, float y1, float x2, float y2);
void polyMake( float x1, float y1, float x2, float y2, int npoints, float start_ang, Vector *pmPoints );
float V_rint(float);
inline int fsign( float x) { if(x==0) return 0; else if (x>0) return 1; else return -1; }
inline bool fequal( float value, float target, float delta) { return ( (value<(target+delta))&&(value>(target-delta)) ); }
void RoundVector( Vector2D &v );
bool IsLineInside(const Vector2D &pt1, const Vector2D &pt2, int x1, int y1, int x2, int y2);
bool IsPointInside(const Vector2D &pt, const Vector2D &mins, const Vector2D &maxs );
bool IsValidBox( Vector &mins, Vector &maxs );
bool IsValidBox( const Vector2D &mins, const Vector2D &maxs );
void NormalizeBox( Vector &mins, Vector &maxs );
void NormalizeBox( Vector2D &mins, Vector2D &maxs );
void PointsFromBox( const Vector &mins, const Vector &maxs, Vector *points );
void LimitBox( Vector &mins, Vector &maxs, float limit );
void PointsRevertOrder( Vector *pPoints, int nPoints);
// Is box 1 inside box 2?
bool IsBoxInside( const Vector2D &min1, const Vector2D &max1, const Vector2D &min2, const Vector2D &max2 );
bool IsBoxIntersecting( const Vector2D &min1, const Vector2D &max1, const Vector2D &min2, const Vector2D &max2 );
const Vector &GetNormalFromPoints( const Vector &p1, const Vector &p2, const Vector &p3 );
const Vector &GetNormalFromFace( int nFace );
inline void TransformPoint( const VMatrix& matrix, Vector &point )
{
Vector orgVector = point;
matrix.V3Mul( orgVector, point );
}
// solve equation v0 = x*v1 + y*v2 + z*v3
void GetAxisFromFace( int nFace, Vector& vHorz, Vector &vVert, Vector &vThrd );
bool SolveLinearEquation( const Vector& v0, const Vector& v1, const Vector& v2, const Vector& v3, Vector& vOut);
// test intersection line & AABB, returns -1 if no intersection occurs
float IntersectionLineAABBox( const Vector& mins, const Vector& maxs, const Vector& vStart, const Vector& vEnd, int &nFace );
bool BuildAxesFromNormal( const Vector &vNormal, Vector &vHorz, Vector &vVert );
#endif // HAMMER_MATHLIB_H