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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 5098 | clevermous | 1 | #ifndef _tgl_zbuffer_h_ |
| 2 | #define _tgl_zbuffer_h_ |
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| 3 | |||
| 4 | /* |
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| 5 | * Z buffer |
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| 6 | */ |
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| 7 | |||
| 8 | #include "zfeatures.h" |
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| 9 | |||
| 10 | #define ZB_Z_BITS 16 |
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| 11 | |||
| 12 | #define ZB_POINT_Z_FRAC_BITS 14 |
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| 13 | |||
| 14 | #define ZB_POINT_S_MIN ( (1<<13) ) |
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| 15 | #define ZB_POINT_S_MAX ( (1<<22)-(1<<13) ) |
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| 16 | #define ZB_POINT_T_MIN ( (1<<21) ) |
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| 17 | #define ZB_POINT_T_MAX ( (1<<30)-(1<<21) ) |
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| 18 | |||
| 19 | #define ZB_POINT_RED_MIN ( (1<<10) ) |
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| 20 | #define ZB_POINT_RED_MAX ( (1<<16)-(1<<10) ) |
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| 21 | #define ZB_POINT_GREEN_MIN ( (1<<9) ) |
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| 22 | #define ZB_POINT_GREEN_MAX ( (1<<16)-(1<<9) ) |
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| 23 | #define ZB_POINT_BLUE_MIN ( (1<<10) ) |
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| 24 | #define ZB_POINT_BLUE_MAX ( (1<<16)-(1<<10) ) |
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| 25 | |||
| 26 | /* display modes */ |
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| 27 | #define ZB_MODE_5R6G5B 1 /* true color 16 bits */ |
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| 28 | #define ZB_MODE_INDEX 2 /* color index 8 bits */ |
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| 29 | #define ZB_MODE_RGBA 3 /* 32 bit rgba mode */ |
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| 30 | #define ZB_MODE_RGB24 4 /* 24 bit rgb mode */ |
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| 31 | #define ZB_NB_COLORS 225 /* number of colors for 8 bit display */ |
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| 32 | |||
| 33 | #if TGL_FEATURE_RENDER_BITS == 15 |
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| 34 | |||
| 35 | #define RGB_TO_PIXEL(r,g,b) \ |
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| 36 | ((((r) >> 1) & 0x7c00) | (((g) >> 6) & 0x03e0) | ((b) >> 11)) |
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| 37 | typedef unsigned short PIXEL; |
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| 38 | /* bytes per pixel */ |
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| 39 | #define PSZB 2 |
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| 40 | /* bits per pixel = (1 << PSZH) */ |
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| 41 | #define PSZSH 4 |
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| 42 | |||
| 43 | #elif TGL_FEATURE_RENDER_BITS == 16 |
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| 44 | |||
| 45 | /* 16 bit mode */ |
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| 46 | #define RGB_TO_PIXEL(r,g,b) \ |
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| 47 | (((r) & 0xF800) | (((g) >> 5) & 0x07E0) | ((b) >> 11)) |
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| 48 | typedef unsigned short PIXEL; |
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| 49 | #define PSZB 2 |
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| 50 | #define PSZSH 4 |
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| 51 | |||
| 52 | #elif TGL_FEATURE_RENDER_BITS == 24 |
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| 53 | |||
| 54 | #define RGB_TO_PIXEL(r,g,b) \ |
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| 55 | ((((r) << 8) & 0xff0000) | ((g) & 0xff00) | ((b) >> 8)) |
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| 56 | typedef unsigned char PIXEL; |
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| 57 | #define PSZB 3 |
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| 58 | #define PSZSH 5 |
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| 59 | |||
| 60 | #elif TGL_FEATURE_RENDER_BITS == 32 |
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| 61 | |||
| 62 | #define RGB_TO_PIXEL(r,g,b) \ |
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| 63 | ((((r) << 8) & 0xff0000) | ((g) & 0xff00) | ((b) >> 8)) |
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| 64 | typedef unsigned int PIXEL; |
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| 65 | #define PSZB 4 |
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| 66 | #define PSZSH 5 |
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| 67 | |||
| 68 | #else |
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| 69 | |||
| 70 | #error Incorrect number of bits per pixel |
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| 71 | |||
| 72 | #endif |
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| 73 | |||
| 74 | typedef struct { |
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| 75 | int xsize,ysize; |
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| 76 | int linesize; /* line size, in bytes */ |
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| 77 | int mode; |
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| 78 | |||
| 79 | unsigned short *zbuf; |
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| 80 | PIXEL *pbuf; |
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| 81 | int frame_buffer_allocated; |
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| 82 | |||
| 83 | int nb_colors; |
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| 84 | unsigned char *dctable; |
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| 85 | int *ctable; |
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| 86 | PIXEL *current_texture; |
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| 87 | } ZBuffer; |
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| 88 | |||
| 89 | typedef struct { |
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| 90 | int x,y,z; /* integer coordinates in the zbuffer */ |
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| 91 | int s,t; /* coordinates for the mapping */ |
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| 92 | int r,g,b; /* color indexes */ |
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| 93 | |||
| 94 | float sz,tz; /* temporary coordinates for mapping */ |
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| 95 | } ZBufferPoint; |
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| 96 | |||
| 97 | /* zbuffer.c */ |
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| 98 | |||
| 99 | ZBuffer *ZB_open(int xsize,int ysize,int mode, |
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| 100 | int nb_colors, |
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| 101 | unsigned char *color_indexes, |
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| 102 | int *color_table, |
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| 103 | void *frame_buffer); |
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| 104 | |||
| 105 | |||
| 106 | void ZB_close(ZBuffer *zb); |
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| 107 | |||
| 108 | void ZB_resize(ZBuffer *zb,void *frame_buffer,int xsize,int ysize); |
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| 109 | void ZB_clear(ZBuffer *zb,int clear_z,int z, |
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| 110 | int clear_color,int r,int g,int b); |
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| 111 | /* linesize is in BYTES */ |
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| 112 | void ZB_copyFrameBuffer(ZBuffer *zb,void *buf,int linesize); |
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| 113 | |||
| 114 | /* zdither.c */ |
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| 115 | |||
| 116 | void ZB_initDither(ZBuffer *zb,int nb_colors, |
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| 117 | unsigned char *color_indexes,int *color_table); |
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| 118 | void ZB_closeDither(ZBuffer *zb); |
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| 119 | void ZB_ditherFrameBuffer(ZBuffer *zb,unsigned char *dest, |
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| 120 | int linesize); |
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| 121 | |||
| 122 | /* zline.c */ |
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| 123 | |||
| 124 | void ZB_plot(ZBuffer *zb,ZBufferPoint *p); |
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| 125 | void ZB_line(ZBuffer *zb,ZBufferPoint *p1,ZBufferPoint *p2); |
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| 126 | void ZB_line_z(ZBuffer * zb, ZBufferPoint * p1, ZBufferPoint * p2); |
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| 127 | |||
| 128 | /* ztriangle.c */ |
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| 129 | |||
| 130 | void ZB_setTexture(ZBuffer *zb, PIXEL *texture); |
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| 131 | |||
| 132 | void ZB_fillTriangleFlat(ZBuffer *zb, |
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| 133 | ZBufferPoint *p1,ZBufferPoint *p2,ZBufferPoint *p3); |
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| 134 | |||
| 135 | void ZB_fillTriangleSmooth(ZBuffer *zb, |
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| 136 | ZBufferPoint *p1,ZBufferPoint *p2,ZBufferPoint *p3); |
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| 137 | |||
| 138 | void ZB_fillTriangleMapping(ZBuffer *zb, |
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| 139 | ZBufferPoint *p1,ZBufferPoint *p2,ZBufferPoint *p3); |
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| 140 | |||
| 141 | void ZB_fillTriangleMappingPerspective(ZBuffer *zb, |
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| 142 | ZBufferPoint *p0,ZBufferPoint *p1,ZBufferPoint *p2); |
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| 143 | |||
| 144 | |||
| 145 | typedef void (*ZB_fillTriangleFunc)(ZBuffer *, |
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| 146 | ZBufferPoint *,ZBufferPoint *,ZBufferPoint *); |
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| 147 | |||
| 148 | /* |
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| 149 | * Memory allocator for TinyGL |
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| 150 | */ |
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| 151 | |||
| 152 | /* modify these functions so that they suit your needs */ |
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| 153 | |||
| 154 | static inline void gl_free(void *p) |
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| 155 | { |
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| 156 | free(p); |
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| 157 | } |
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| 158 | |||
| 159 | static inline void *gl_malloc(int size) |
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| 160 | { |
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| 161 | return malloc(size); |
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| 162 | } |
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| 163 | |||
| 164 | static inline void *gl_zalloc(int size) |
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| 165 | { |
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| 166 | return calloc(1, size); |
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| 167 | } |
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| 168 | |||
| 169 | #endif /* _tgl_zbuffer_h_ */ |