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3D_Engine.h
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3D_Engine.h
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#ifndef _3D_ENGINE
#define _3D_ENGINE
/* ========= */
/* Constants */
/* ========= */
#define PI 3.1415926535898
#define MAX_ANGLE 65536 // value that is equivalent to 360 degrees
#define _360_DEGREES (MAX_ANGLE)
#define _270_DEGREES (3*MAX_ANGLE/4)
#define _180_DEGREES (MAX_ANGLE/2)
#define _90_DEGREES (MAX_ANGLE/4)
#define _0_DEGREES (0)
// could use enumerated type for the following
#define X_X_COMP 0 // rotated x components
#define X_Y_COMP 1
#define X_Z_COMP 2
#define Y_X_COMP 3 // rotated y components
#define Y_Y_COMP 4
#define Y_Z_COMP 5
#define Z_X_COMP 6 // rotated z components
#define Z_Y_COMP 7
#define Z_Z_COMP 8
#define NUM_TRIG_COEFFS Z_Z_COMP + 1
#define PRECISION 16384
#define LOG_PRECISION 14 // to base 2
#define MAX_POLY_SIDES 8
#define MAX_COORDS 200
//#define FOCUS 256 // for screen width of 320
//#define LOG_FOCUS 8 // to base 2
#define FOCUS 512 // for screen width of 640
#define LOG_FOCUS 9 // to base 2
/* ===================== */
/* Structure definitions */
/* ===================== */
typedef struct
{
long x;
long y;
long z;
} COORD_3D;
typedef struct
{
long x;
long y;
} COORD_2D;
/* ============================== */
/* External function declarations */
/* ============================== */
extern void CreateSinCosTable( void );
extern void GetSinCos( long angle,
short *sin,
short *cos );
extern void SetWorldOffset( long x_offset,
long y_offset,
long z_offset );
extern void SetCoords( COORD_3D *tptr,
COORD_2D *sptr );
extern void DefaultCoords( void );
extern void CalcYXZTrigCoefficients( long x_angle,
long y_angle,
long z_angle );
extern short *TrigCoefficients( void );
extern void RotateCoordinate( long *xptr,
long *yptr,
long *zptr );
extern void WorldOffset( long *xptr,
long *yptr,
long *zptr );
extern long TransformCoordinates( COORD_3D *cptr,
long size );
extern long TransformedZ( long offset );
extern long TexturedPolygon( long *cptr,
long sides,
long *vptr );
extern long PolygonVisible( long *cptr );
extern long Polygon( long *cptr,
long sides );
extern long PolygonEx( long *cptr,
long sides,
long *optr );
extern void Line( long c1,
long c2 );
extern long PolygonZClipped( long *cptr,
long sides,
long check_orientation,
long *on_screen );
extern void LineZClipped( long c1,
long c2 );
extern void ZClip( COORD_3D *below,
COORD_3D *above,
long screen_width,
long screen_height,
long *x,
long *y );
extern void LockViewpointToTarget( long viewpoint_x,
long viewpoint_y,
long viewpoint_z,
long target_x,
long target_y,
long target_z,
long *viewpoint_x_angle,
long *viewpoint_y_angle );
extern HRESULT CreatePolygonVertexBuffer (IDirect3DDevice9 *pd3dDevice);
extern void FreePolygonVertexBuffer (void);
extern void DrawPolygon( POINT *pptr,
long sides );
extern void DrawFilledRectangle( long x1, long y1, long x2, long y2, DWORD colour );
#endif /* _3D_ENGINE */