//-----------------------------------------------------------------------------
// V12 Engine
// 
// Copyright (c) 2001 GarageGames.Com
// Portions Copyright (c) 2001 by Sierra Online, Inc.
//-----------------------------------------------------------------------------

#ifndef _SGUTIL_H_
#define _SGUTIL_H_

#ifndef _PLATFORM_H_
#include "Platform/platform.h"
#endif
#ifndef _MPOINT_H_
#include "Math/mPoint.h"
#endif

class RectI;
class MatrixF;

struct SGWinding
{
   Point3F points[32];
   U32     numPoints;
};

bool sgComputeNewFrustum(const F64*       oldFrustum,
                         const F64        nearPlane,
                         const F64        farPlane,
                         const RectI&     oldViewport,
                         const SGWinding* windings,
                         const U32        numWindings,
                         const MatrixF&   modelview,
                         F64*             newFrustum,
                         RectI&           newViewport,
                         const bool       flippedMatrix);


// Frustum parameters are:
//  [0] = left
//  [1] = right
//  [2] = top
//  [3] = bottom
//  [4] = near
//  [5] = far
void sgComputeOSFrustumPlanes(const F64      frustumParameters[6],
                              const MatrixF& worldSpaceToObjectSpace,
                              const Point3F& wsCamPoint,
                              PlaneF&        outFarPlane,
                              PlaneF&        outXMinPlane,
                              PlaneF&        outXMaxPlane,
                              PlaneF&        outYMinPlane,
                              PlaneF&        outYMaxPlane);

#endif  // _H_SGUTIL_