gz.h

/*
 * Gz.h - include file for the cs580 rendering library
 */

/*
 * universal constants
 */
#define GZ_SUCCESS      0
#define GZ_FAILURE      1

/*
 * name list tokens
 */
#define GZ_NULL_TOKEN        0	/* triangle vert attributes */
#define GZ_POSITION          1
#define GZ_NORMAL            2
#define GZ_TEXTURE_INDEX     3


#define	GZ_AASHIFTX	44	/* antialiasing screen offset */
#define	GZ_AASHIFTY	45	/* antialiasing screen offset */
#define GZ_AAWEIGHT 46

/* renderer-state default pixel color */
#define GZ_RGB_COLOR            99	

#define GZ_INTERPOLATE	95	/* define interpolation mode */

#define GZ_DIRECTIONAL_LIGHT	79	/* directional light */
#define GZ_AMBIENT_LIGHT		78	/* ambient light type */

#define GZ_AMBIENT_COEFFICIENT		1001	/* Ka material property */
#define GZ_DIFFUSE_COEFFICIENT		1002	/* Kd material property */
#define GZ_SPECULAR_COEFFICIENT		1003	/* Ks material property */
#define GZ_DISTRIBUTION_COEFFICIENT	1004	/* specular power of material */

#define	GZ_TEXTURE_MAP			1010	/* pointer to texture routine */
/*
 * flags fields for value list attributes
 */

/* select interpolation mode of the shader (only one) */
#define GZ_FLAT		0	/* flat shading with GZ_RBG_COLOR */
#define	GZ_COLOR	  1	/* interpolate vertex color */
#define	GZ_NORMALS	  2	/* interpolate normals */

typedef int     GzToken;
typedef void    *GzPointer;
typedef float   GzColor[3];
typedef short   GzIntensity;	/* 0 - 4095 in lower 12-bits */
typedef float   GzCoord[3];
typedef float   GzTextureIndex[2];
typedef float   GzMatrix[4][4];
typedef int	GzDepth;		/* z is signed for clipping */

typedef	int	(*GzTexture)(float u, float v, GzColor color);	/* pointer to texture sampling method */
/* u,v parameters [0,1] are defined tex_fun(float u, float v, GzColor color) */

/*
 * Gz camera definition
 */
#ifndef GZCAMERA
#define GZCAMERA
typedef struct  GzCamera
{
  GzMatrix     Xiw;  		/* xform from world to image space */
  GzMatrix     Xpi;  		/* perspective projection xform */
  GzCoord      position;  	/* position of image plane origin */
  GzCoord      lookat;         /* position of look-at-point */
  GzCoord      worldup;  /* world up-vector (almost screen up) */
  float        FOV;            /* horizontal field of view */
} GzCamera;
#endif

#ifndef GZLIGHT
#define GZLIGHT
typedef struct  GzLight
{
   GzCoord    direction; 	/* vector from surface to light */
   GzColor    color;		/* light color intensity */
} GzLight;
#endif

#ifndef GZINPUT
#define GZINPUT
typedef struct  GzInput
{
   GzCoord            rotation;       /* object rotation */
   GzCoord			translation;	/* object translation */
   GzCoord			scale;			/* object scaling */
   GzCamera		camera;			/* camera */
} GzInput;
#endif

#define RED     0        /* array indicies for color vector */
#define GREEN   1
#define BLUE    2

#define X       0        /* array indicies for position vector*/
#define Y       1
#define Z       2

#define U       0        /* array indicies for texture coords */
#define V       1