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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 5098 | clevermous | 1 | { |
| 2 | int n, dx, dy, sx, pp_inc_1, pp_inc_2; |
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| 3 | register int a; |
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| 4 | register PIXEL *pp; |
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| 5 | #if defined(INTERP_RGB) || TGL_FEATURE_RENDER_BITS == 24 |
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| 6 | register unsigned int r, g, b; |
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| 7 | #endif |
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| 8 | #ifdef INTERP_RGB |
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| 9 | register unsigned int rinc, ginc, binc; |
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| 10 | #endif |
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| 11 | #ifdef INTERP_Z |
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| 12 | register unsigned short *pz; |
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| 13 | int zinc; |
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| 14 | register int z, zz; |
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| 15 | #endif |
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| 16 | |||
| 17 | if (p1->y > p2->y || (p1->y == p2->y && p1->x > p2->x)) { |
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| 18 | ZBufferPoint *tmp; |
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| 19 | tmp = p1; |
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| 20 | p1 = p2; |
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| 21 | p2 = tmp; |
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| 22 | } |
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| 23 | sx = zb->xsize; |
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| 24 | pp = (PIXEL *) ((char *) zb->pbuf + zb->linesize * p1->y + p1->x * PSZB); |
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| 25 | #ifdef INTERP_Z |
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| 26 | pz = zb->zbuf + (p1->y * sx + p1->x); |
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| 27 | z = p1->z; |
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| 28 | #endif |
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| 29 | |||
| 30 | dx = p2->x - p1->x; |
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| 31 | dy = p2->y - p1->y; |
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| 32 | #ifdef INTERP_RGB |
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| 33 | r = p1->r << 8; |
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| 34 | g = p1->g << 8; |
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| 35 | b = p1->b << 8; |
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| 36 | #elif TGL_FEATURE_RENDER_BITS == 24 |
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| 37 | /* for 24 bits, we store the colors in different variables */ |
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| 38 | r = p2->r >> 8; |
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| 39 | g = p2->g >> 8; |
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| 40 | b = p2->b >> 8; |
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| 41 | #endif |
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| 42 | |||
| 43 | #ifdef INTERP_RGB |
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| 44 | #define RGB(x) x |
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| 45 | #if TGL_FEATURE_RENDER_BITS == 24 |
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| 46 | #define RGBPIXEL pp[0] = r >> 16, pp[1] = g >> 16, pp[2] = b >> 16 |
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| 47 | #else |
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| 48 | #define RGBPIXEL *pp = RGB_TO_PIXEL(r >> 8,g >> 8,b >> 8) |
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| 49 | #endif |
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| 50 | #else /* INTERP_RGB */ |
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| 51 | #define RGB(x) |
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| 52 | #if TGL_FEATURE_RENDER_BITS == 24 |
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| 53 | #define RGBPIXEL pp[0] = r, pp[1] = g, pp[2] = b |
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| 54 | #else |
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| 55 | #define RGBPIXEL *pp = color |
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| 56 | #endif |
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| 57 | #endif /* INTERP_RGB */ |
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| 58 | |||
| 59 | #ifdef INTERP_Z |
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| 60 | #define ZZ(x) x |
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| 61 | #define PUTPIXEL() \ |
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| 62 | { \ |
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| 63 | zz=z >> ZB_POINT_Z_FRAC_BITS; \ |
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| 64 | if (ZCMP(zz,*pz)) { \ |
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| 65 | RGBPIXEL; \ |
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| 66 | *pz=zz; \ |
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| 67 | } \ |
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| 68 | } |
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| 69 | #else /* INTERP_Z */ |
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| 70 | #define ZZ(x) |
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| 71 | #define PUTPIXEL() RGBPIXEL |
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| 72 | #endif /* INTERP_Z */ |
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| 73 | |||
| 74 | #define DRAWLINE(dx,dy,inc_1,inc_2) \ |
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| 75 | n=dx;\ |
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| 76 | ZZ(zinc=(p2->z-p1->z)/n);\ |
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| 77 | RGB(rinc=((p2->r-p1->r) << 8)/n;\ |
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| 78 | ginc=((p2->g-p1->g) << 8)/n;\ |
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| 79 | binc=((p2->b-p1->b) << 8)/n);\ |
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| 80 | a=2*dy-dx;\ |
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| 81 | dy=2*dy;\ |
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| 82 | dx=2*dx-dy;\ |
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| 83 | pp_inc_1 = (inc_1) * PSZB;\ |
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| 84 | pp_inc_2 = (inc_2) * PSZB;\ |
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| 85 | do {\ |
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| 86 | PUTPIXEL();\ |
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| 87 | ZZ(z+=zinc);\ |
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| 88 | RGB(r+=rinc;g+=ginc;b+=binc);\ |
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| 89 | if (a>0) { pp=(PIXEL *)((char *)pp + pp_inc_1); ZZ(pz+=(inc_1)); a-=dx; }\ |
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| 90 | else { pp=(PIXEL *)((char *)pp + pp_inc_2); ZZ(pz+=(inc_2)); a+=dy; }\ |
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| 91 | } while (--n >= 0); |
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| 92 | |||
| 93 | /* fin macro */ |
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| 94 | |||
| 95 | if (dx == 0 && dy == 0) { |
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| 96 | PUTPIXEL(); |
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| 97 | } else if (dx > 0) { |
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| 98 | if (dx >= dy) { |
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| 99 | DRAWLINE(dx, dy, sx + 1, 1); |
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| 100 | } else { |
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| 101 | DRAWLINE(dy, dx, sx + 1, sx); |
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| 102 | } |
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| 103 | } else { |
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| 104 | dx = -dx; |
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| 105 | if (dx >= dy) { |
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| 106 | DRAWLINE(dx, dy, sx - 1, -1); |
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| 107 | } else { |
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| 108 | DRAWLINE(dy, dx, sx - 1, sx); |
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| 109 | } |
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| 110 | } |
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| 111 | } |
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| 112 | |||
| 113 | #undef INTERP_Z |
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| 114 | #undef INTERP_RGB |
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| 115 | |||
| 116 | /* internal defines */ |
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| 117 | #undef DRAWLINE |
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| 118 | #undef PUTPIXEL |
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| 119 | #undef ZZ |
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| 120 | #undef RGB |
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| 121 | #undef RGBPIXEL |