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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 5131 | clevermous | 1 | /* |
| 2 | Copyright (C) 1996-1997 Id Software, Inc. |
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| 3 | |||
| 4 | This program is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU General Public License |
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| 6 | as published by the Free Software Foundation; either version 2 |
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| 7 | of the License, or (at your option) any later version. |
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| 8 | |||
| 9 | This program is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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| 12 | |||
| 13 | See the GNU General Public License for more details. |
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| 14 | |||
| 15 | You should have received a copy of the GNU General Public License |
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| 16 | along with this program; if not, write to the Free Software |
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| 17 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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| 18 | |||
| 19 | */ |
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| 20 | // d_sky.c |
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| 21 | |||
| 22 | #include "quakedef.h" |
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| 23 | #include "r_local.h" |
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| 24 | #include "d_local.h" |
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| 25 | |||
| 26 | #define SKY_SPAN_SHIFT 5 |
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| 27 | #define SKY_SPAN_MAX (1 << SKY_SPAN_SHIFT) |
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| 28 | |||
| 29 | |||
| 30 | /* |
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| 31 | ================= |
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| 32 | D_Sky_uv_To_st |
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| 33 | ================= |
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| 34 | */ |
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| 35 | void D_Sky_uv_To_st (int u, int v, fixed16_t *s, fixed16_t *t) |
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| 36 | { |
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| 37 | float wu, wv, temp; |
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| 38 | vec3_t end; |
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| 39 | |||
| 40 | if (r_refdef.vrect.width >= r_refdef.vrect.height) |
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| 41 | temp = (float)r_refdef.vrect.width; |
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| 42 | else |
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| 43 | temp = (float)r_refdef.vrect.height; |
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| 44 | |||
| 45 | wu = 8192.0 * (float)(u-((int)vid.width>>1)) / temp; |
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| 46 | wv = 8192.0 * (float)(((int)vid.height>>1)-v) / temp; |
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| 47 | |||
| 48 | end[0] = 4096*vpn[0] + wu*vright[0] + wv*vup[0]; |
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| 49 | end[1] = 4096*vpn[1] + wu*vright[1] + wv*vup[1]; |
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| 50 | end[2] = 4096*vpn[2] + wu*vright[2] + wv*vup[2]; |
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| 51 | end[2] *= 3; |
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| 52 | VectorNormalize (end); |
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| 53 | |||
| 54 | temp = skytime*skyspeed; // TODO: add D_SetupFrame & set this there |
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| 55 | *s = (int)((temp + 6*(SKYSIZE/2-1)*end[0]) * 0x10000); |
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| 56 | *t = (int)((temp + 6*(SKYSIZE/2-1)*end[1]) * 0x10000); |
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| 57 | } |
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| 58 | |||
| 59 | |||
| 60 | /* |
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| 61 | ================= |
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| 62 | D_DrawSkyScans8 |
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| 63 | ================= |
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| 64 | */ |
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| 65 | void D_DrawSkyScans8 (espan_t *pspan) |
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| 66 | { |
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| 67 | int count, spancount, u, v; |
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| 68 | unsigned char *pdest; |
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| 69 | fixed16_t s, t, snext, tnext, sstep, tstep; |
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| 70 | int spancountminus1; |
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| 71 | |||
| 72 | sstep = 0; // keep compiler happy |
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| 73 | tstep = 0; // ditto |
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| 74 | |||
| 75 | do |
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| 76 | { |
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| 77 | pdest = (unsigned char *)((byte *)d_viewbuffer + |
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| 78 | (screenwidth * pspan->v) + pspan->u); |
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| 79 | |||
| 80 | count = pspan->count; |
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| 81 | |||
| 82 | // calculate the initial s & t |
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| 83 | u = pspan->u; |
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| 84 | v = pspan->v; |
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| 85 | D_Sky_uv_To_st (u, v, &s, &t); |
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| 86 | |||
| 87 | do |
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| 88 | { |
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| 89 | if (count >= SKY_SPAN_MAX) |
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| 90 | spancount = SKY_SPAN_MAX; |
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| 91 | else |
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| 92 | spancount = count; |
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| 93 | |||
| 94 | count -= spancount; |
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| 95 | |||
| 96 | if (count) |
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| 97 | { |
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| 98 | u += spancount; |
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| 99 | |||
| 100 | // calculate s and t at far end of span, |
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| 101 | // calculate s and t steps across span by shifting |
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| 102 | D_Sky_uv_To_st (u, v, &snext, &tnext); |
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| 103 | |||
| 104 | sstep = (snext - s) >> SKY_SPAN_SHIFT; |
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| 105 | tstep = (tnext - t) >> SKY_SPAN_SHIFT; |
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| 106 | } |
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| 107 | else |
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| 108 | { |
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| 109 | // calculate s and t at last pixel in span, |
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| 110 | // calculate s and t steps across span by division |
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| 111 | spancountminus1 = (float)(spancount - 1); |
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| 112 | |||
| 113 | if (spancountminus1 > 0) |
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| 114 | { |
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| 115 | u += spancountminus1; |
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| 116 | D_Sky_uv_To_st (u, v, &snext, &tnext); |
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| 117 | |||
| 118 | sstep = (snext - s) / spancountminus1; |
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| 119 | tstep = (tnext - t) / spancountminus1; |
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| 120 | } |
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| 121 | } |
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| 122 | |||
| 123 | do |
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| 124 | { |
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| 125 | *pdest++ = r_skysource[((t & R_SKY_TMASK) >> 8) + |
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| 126 | ((s & R_SKY_SMASK) >> 16)]; |
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| 127 | s += sstep; |
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| 128 | t += tstep; |
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| 129 | } while (--spancount > 0); |
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| 130 | |||
| 131 | s = snext; |
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| 132 | t = tnext; |
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| 133 | |||
| 134 | } while (count > 0); |
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| 135 | |||
| 136 | } while ((pspan = pspan->pnext) != NULL); |
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| 137 | } |
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| 138 |