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- #ifndef _tgl_zbuffer_h_
- #define _tgl_zbuffer_h_
-
- /*
- * Z buffer
- */
-
- #include "zfeatures.h"
-
- #define ZB_Z_BITS 16
-
- #define ZB_POINT_Z_FRAC_BITS 14
-
- #define ZB_POINT_S_MIN ( (1<<13) )
- #define ZB_POINT_S_MAX ( (1<<22)-(1<<13) )
- #define ZB_POINT_T_MIN ( (1<<21) )
- #define ZB_POINT_T_MAX ( (1<<30)-(1<<21) )
-
- #define ZB_POINT_RED_MIN ( (1<<10) )
- #define ZB_POINT_RED_MAX ( (1<<16)-(1<<10) )
- #define ZB_POINT_GREEN_MIN ( (1<<9) )
- #define ZB_POINT_GREEN_MAX ( (1<<16)-(1<<9) )
- #define ZB_POINT_BLUE_MIN ( (1<<10) )
- #define ZB_POINT_BLUE_MAX ( (1<<16)-(1<<10) )
-
- /* display modes */
- #define ZB_MODE_5R6G5B 1 /* true color 16 bits */
- #define ZB_MODE_INDEX 2 /* color index 8 bits */
- #define ZB_MODE_RGBA 3 /* 32 bit rgba mode */
- #define ZB_MODE_RGB24 4 /* 24 bit rgb mode */
- #define ZB_NB_COLORS 225 /* number of colors for 8 bit display */
-
- #if TGL_FEATURE_RENDER_BITS == 15
-
- #define RGB_TO_PIXEL(r,g,b) \
- ((((r) >> 1) & 0x7c00) | (((g) >> 6) & 0x03e0) | ((b) >> 11))
- typedef unsigned short PIXEL;
- /* bytes per pixel */
- #define PSZB 2
- /* bits per pixel = (1 << PSZH) */
- #define PSZSH 4
-
- #elif TGL_FEATURE_RENDER_BITS == 16
-
- /* 16 bit mode */
- #define RGB_TO_PIXEL(r,g,b) \
- (((r) & 0xF800) | (((g) >> 5) & 0x07E0) | ((b) >> 11))
- typedef unsigned short PIXEL;
- #define PSZB 2
- #define PSZSH 4
-
- #elif TGL_FEATURE_RENDER_BITS == 24
-
- #define RGB_TO_PIXEL(r,g,b) \
- ((((r) << 8) & 0xff0000) | ((g) & 0xff00) | ((b) >> 8))
- typedef unsigned char PIXEL;
- #define PSZB 3
- #define PSZSH 5
-
- #elif TGL_FEATURE_RENDER_BITS == 32
-
- #define RGB_TO_PIXEL(r,g,b) \
- ((((r) << 8) & 0xff0000) | ((g) & 0xff00) | ((b) >> 8))
- typedef unsigned int PIXEL;
- #define PSZB 4
- #define PSZSH 5
-
- #else
-
- #error Incorrect number of bits per pixel
-
- #endif
-
- typedef struct {
- int xsize,ysize;
- int linesize; /* line size, in bytes */
- int mode;
-
- unsigned short *zbuf;
- PIXEL *pbuf;
- int frame_buffer_allocated;
-
- int nb_colors;
- unsigned char *dctable;
- int *ctable;
- PIXEL *current_texture;
- } ZBuffer;
-
- typedef struct {
- int x,y,z; /* integer coordinates in the zbuffer */
- int s,t; /* coordinates for the mapping */
- int r,g,b; /* color indexes */
-
- float sz,tz; /* temporary coordinates for mapping */
- } ZBufferPoint;
-
- /* zbuffer.c */
-
- ZBuffer *ZB_open(int xsize,int ysize,int mode,
- int nb_colors,
- unsigned char *color_indexes,
- int *color_table,
- void *frame_buffer);
-
-
- void ZB_close(ZBuffer *zb);
-
- void ZB_resize(ZBuffer *zb,void *frame_buffer,int xsize,int ysize);
- void ZB_clear(ZBuffer *zb,int clear_z,int z,
- int clear_color,int r,int g,int b);
- /* linesize is in BYTES */
- void ZB_copyFrameBuffer(ZBuffer *zb,void *buf,int linesize);
-
- /* zdither.c */
-
- void ZB_initDither(ZBuffer *zb,int nb_colors,
- unsigned char *color_indexes,int *color_table);
- void ZB_closeDither(ZBuffer *zb);
- void ZB_ditherFrameBuffer(ZBuffer *zb,unsigned char *dest,
- int linesize);
-
- /* zline.c */
-
- void ZB_plot(ZBuffer *zb,ZBufferPoint *p);
- void ZB_line(ZBuffer *zb,ZBufferPoint *p1,ZBufferPoint *p2);
- void ZB_line_z(ZBuffer * zb, ZBufferPoint * p1, ZBufferPoint * p2);
-
- /* ztriangle.c */
-
- void ZB_setTexture(ZBuffer *zb, PIXEL *texture);
-
- void ZB_fillTriangleFlat(ZBuffer *zb,
- ZBufferPoint *p1,ZBufferPoint *p2,ZBufferPoint *p3);
-
- void ZB_fillTriangleSmooth(ZBuffer *zb,
- ZBufferPoint *p1,ZBufferPoint *p2,ZBufferPoint *p3);
-
- void ZB_fillTriangleMapping(ZBuffer *zb,
- ZBufferPoint *p1,ZBufferPoint *p2,ZBufferPoint *p3);
-
- void ZB_fillTriangleMappingPerspective(ZBuffer *zb,
- ZBufferPoint *p0,ZBufferPoint *p1,ZBufferPoint *p2);
-
-
- typedef void (*ZB_fillTriangleFunc)(ZBuffer *,
- ZBufferPoint *,ZBufferPoint *,ZBufferPoint *);
-
- /* memory.c */
- void gl_free(void *p);
- void *gl_malloc(int size);
- void *gl_zalloc(int size);
-
- #endif /* _tgl_zbuffer_h_ */
-