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