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#ifndef _frustrum_h_ /* Is this your first time? */
#define _frustrum_h_ 1
#include "kshape.h"
/*
* KJL 15:13:43 7/17/97 - frustrum.h
*
* function prototypes & pointers for things connected
* to the view frustrum and clipping
*
*/
enum FrustrumType
{
FRUSTRUM_TYPE_NORMAL,
FRUSTRUM_TYPE_WIDE
};
extern void SetFrustrumType(enum FrustrumType frustrumType);
/* GOURAUD POLYGON CLIPPING */
extern void GouraudPolygon_ClipWithZ(void);
extern void (*GouraudPolygon_ClipWithNegativeX)(void);
extern void (*GouraudPolygon_ClipWithPositiveY)(void);
extern void (*GouraudPolygon_ClipWithNegativeY)(void);
extern void (*GouraudPolygon_ClipWithPositiveX)(void);
/* TEXTURED POLYGON CLIPPING */
extern void TexturedPolygon_ClipWithZ(void);
extern void (*TexturedPolygon_ClipWithNegativeX)(void);
extern void (*TexturedPolygon_ClipWithPositiveY)(void);
extern void (*TexturedPolygon_ClipWithNegativeY)(void);
extern void (*TexturedPolygon_ClipWithPositiveX)(void);
/* GOURAUD TEXTURED POLYGON CLIPPING */
extern void GouraudTexturedPolygon_ClipWithZ(void);
extern void (*GouraudTexturedPolygon_ClipWithNegativeX)(void);
extern void (*GouraudTexturedPolygon_ClipWithPositiveY)(void);
extern void (*GouraudTexturedPolygon_ClipWithNegativeY)(void);
extern void (*GouraudTexturedPolygon_ClipWithPositiveX)(void);
/* FRUSTRUM TESTS */
extern int PolygonWithinFrustrum(POLYHEADER *polyPtr);
extern int PolygonShouldBeDrawn(POLYHEADER *polyPtr);
extern int (*ObjectWithinFrustrum)(DISPLAYBLOCK *dbPtr);
extern int (*ObjectCompletelyWithinFrustrum)(DISPLAYBLOCK *dbPtr);
extern int (*VertexWithinFrustrum)(RENDERVERTEX *vertexPtr);
extern void (*TestVerticesWithFrustrum)(void);
extern int DecalWithinFrustrum(DECAL *decalPtr);
extern int QuadWithinFrustrum(void);
extern int TriangleWithinFrustrum(void);
/* pass a pointer to a vertex to be tested; results are returned in an int,
using the following defines */
#define INSIDE_FRUSTRUM_Z_PLANE 1
#define INSIDE_FRUSTRUM_PX_PLANE 2
#define INSIDE_FRUSTRUM_NX_PLANE 4
#define INSIDE_FRUSTRUM_PY_PLANE 8
#define INSIDE_FRUSTRUM_NY_PLANE 16
#define INSIDE_FRUSTRUM 31
extern char FrustrumFlagForVertex[maxrotpts];
#define USE_FOV_53 0
#endif
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