1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
#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_ */
|
