render.h

seismic software,very useful

/*
render object definition

The render has several zoom axes, drawing buffer, zbuffer and shadow buffer
Independent of graphics calls
Uses axis, data, and zoom definitions
*/

/* contants */
#define	RENDER_INTERP	16777216
#define	NALPHA		256
#define	RENDER_POLARITY		1
#define	RENDER_FENCE_TRANSP	1
#define RENDER_LOW_TRANSP	0
#define RENDER_HIGH_TRANSP	100
#define	RENDER_VOL_TRANSP	100

/* a shadow contains index information about an render: drawing side + data index */
typedef unsigned int* Shadow;
typedef unsigned int Shadow_;
/* Zbuffer records depth of object in depth axis samples */
typedef unsigned int* Zbuffer;
typedef unsigned int Zbuffer_;
/* Render object */
typedef struct {
	int	wide;	/* drawing surface dimensions */
	int	hite;
	int	h0, v0, nh, nv;	/* window last drawn */
	int	interp;		/* interpolation flag */
	int	polarity;	/* color mapping polarity */
	int	fence_transp;	/* fence transparency (0-100) */
	int	low_transp;	/* low opacity value */
	int	high_transp;	/* low opacity value */
	int	vol_transp;	/* opacity gradient */
	float	alpha[NALPHA];	/* alpha channel for transparency */
	unsigned char	cmap[256];	/* data -> color map */
	unsigned char	tmap[65536];	/* transparency map */
	Buffer	image;	/* render pixel buffer */
	Shadow	shadow;	/* render shadow buffer */
	Zbuffer	zbuffer;	/* zbuffer to record render depth */
	} *Render;

/* render attribute list */
#define	RENDER_HORZ	1
#define	RENDER_VERT	2
#define	RENDER_DEEP	3
typedef struct {
	int	orient;	/* RENDER_HORZ, RENDER_VERT, RENDER_DEEP */
	int	image;	/* draw image */
	int	shadow;	/* draw shadow */
	int	zbuffer;	/* draw zbuffer */
	int	box;	/* draw bounding box */
	int	axes;	/* draw axes */
	int	lines;	/* draw cross lines */
	int	pick;	/* draw picks */
	int	skew;	/* draw skewed */
	int	transp;	/* draw transparent */
	int	mark;	/* record the frame in plane list */
	} *RenderAttr;

/* typed returns */
Render RenderInit (/*data*/);
Buffer RenderBuffer (/*render*/);