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Pawel Kolodziejski
98 lines
2.8 KiB
C
98 lines
2.8 KiB
C
#ifndef _tgl_zbuffer_h_
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#define _tgl_zbuffer_h_
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// Z buffer
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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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// 16 bit mode
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#define RGB_TO_PIXEL(r,g,b) (((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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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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unsigned int *zbuf2;
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unsigned char *shadow_mask_buf;
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int shadow_color_r;
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int shadow_color_g;
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int shadow_color_b;
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PIXEL *pbuf;
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int frame_buffer_allocated;
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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, 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, 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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//void ZB_setShadowMaskBuf(
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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, ZBufferPoint *p1,
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ZBufferPoint *p2, ZBufferPoint *p3);
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void ZB_fillTriangleFlatShadowMask(ZBuffer *zb, ZBufferPoint *p1,
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ZBufferPoint *p2, ZBufferPoint *p3);
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void ZB_fillTriangleFlatShadow(ZBuffer *zb, ZBufferPoint *p1,
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ZBufferPoint *p2, ZBufferPoint *p3);
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void ZB_fillTriangleSmooth(ZBuffer *zb, ZBufferPoint *p1,
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ZBufferPoint *p2, ZBufferPoint *p3);
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void ZB_fillTriangleMapping(ZBuffer *zb, ZBufferPoint *p1,
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ZBufferPoint *p2, ZBufferPoint *p3);
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void ZB_fillTriangleMappingPerspective(ZBuffer *zb, ZBufferPoint *p0,
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ZBufferPoint *p1, ZBufferPoint *p2);
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typedef void (*ZB_fillTriangleFunc)(ZBuffer *, ZBufferPoint *,
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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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