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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 allocator for TinyGL |
| */ |
| |
| /* modify these functions so that they suit your needs */ |
| |
| static inline void gl_free(void *p) |
| { |
| free(p); |
| } |
| |
| static inline void *gl_malloc(int size) |
| { |
| return malloc(size); |
| } |
| |
| static inline void *gl_zalloc(int size) |
| { |
| return calloc(1, size); |
| } |
| |
| #endif /* _tgl_zbuffer_h_ */ |