/******************************************************************************

 **                                                                          **

 **     Module:     SR_Math.h                                                **

 **                                                                          **

 **                                                                          **

 **     Purpose:    Sample renderer math routines                            **

 **                                                                          **

 **                                                                          **

 **                                                                          **

 **     Copyright (C) 1992-1996 Apple Computer, Inc.  All rights reserved.   **

 **                                                                          **

 **                                                                          **

 *****************************************************************************/

#ifndef SR_Math_h

#define SR_Math_h

#include "QD3D.h"

#include "QD3DGeometry.h"

#ifdef __cplusplus

extern "C" {

#endif  /* __cplusplus */

typedef struct TSRVector4D {

    float       x;

    float       y;

    float       z;

    float       w;

} TSRVector4D;

TQ3Status SRTriangle_GetNormal(

    TQ3TriangleData     *triangleData,

    TQ3Vector3D         *normal);

void SRMatrix_LUDecomposeSingular3x3(

    float               matrix[3][3],

    long                indexPtr[3],

    float               *rowInterchanges,

    long                *rank);

TQ3Status SRMatrix_ComputeFlatLand(

    TQ3Matrix4x4        *matrix,

    TQ3Matrix3x3        *luDecomp,

    TQ3Boolean          parallelProjection,

    TSRVector4D         *eyeVectorWC,

    TQ3RationalPoint4D  *eyePointWC,

    TSRVector4D         *eyeVectorLC,

    TQ3PlaneEquation    *flatWorld);

TSRVector4D *SRVector4D_Set(

    TSRVector4D         *vector4D,

    float               x, 

    float               y,

    float               z, 

    float               w);

TSRVector4D *SRVector3D_To4D(

    const TQ3Vector3D   *vector3D,

    TSRVector4D         *result);

TQ3Vector3D *SRVector4D_To3D(

    const TSRVector4D   *vector4D,

    TQ3Vector3D         *result);

TSRVector4D *SRVector4D_Negate(

    const TSRVector4D   *vector4D,

    TSRVector4D         *result);

TSRVector4D *SRVector4D_Normalize(

    const TSRVector4D   *vector4D,

    TSRVector4D         *result);

TSRVector4D *SRVector4D_Transform(

    const TSRVector4D   *vector4D,

    const TQ3Matrix4x4  *matrix4x4,

    TSRVector4D         *result);

#ifdef __cplusplus

}

#endif  /* __cplusplus */

#endif  /*  SR_Math_h  */