diff options
Diffstat (limited to 'apps/plugins/sdl/progs/quake/d_sky.c')
-rw-r--r-- | apps/plugins/sdl/progs/quake/d_sky.c | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/apps/plugins/sdl/progs/quake/d_sky.c b/apps/plugins/sdl/progs/quake/d_sky.c new file mode 100644 index 0000000000..9e28a8e576 --- /dev/null +++ b/apps/plugins/sdl/progs/quake/d_sky.c | |||
@@ -0,0 +1,138 @@ | |||
1 | /* | ||
2 | Copyright (C) 1996-1997 Id Software, Inc. | ||
3 | |||
4 | This program is free software; you can redistribute it and/or | ||
5 | modify it under the terms of the GNU General Public License | ||
6 | as published by the Free Software Foundation; either version 2 | ||
7 | of the License, or (at your option) any later version. | ||
8 | |||
9 | This program is distributed in the hope that it will be useful, | ||
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | ||
12 | |||
13 | See the GNU General Public License for more details. | ||
14 | |||
15 | You should have received a copy of the GNU General Public License | ||
16 | along with this program; if not, write to the Free Software | ||
17 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | ||
18 | |||
19 | */ | ||
20 | // d_sky.c | ||
21 | |||
22 | #include "quakedef.h" | ||
23 | #include "r_local.h" | ||
24 | #include "d_local.h" | ||
25 | |||
26 | #define SKY_SPAN_SHIFT 5 | ||
27 | #define SKY_SPAN_MAX (1 << SKY_SPAN_SHIFT) | ||
28 | |||
29 | |||
30 | /* | ||
31 | ================= | ||
32 | D_Sky_uv_To_st | ||
33 | ================= | ||
34 | */ | ||
35 | void D_Sky_uv_To_st (int u, int v, fixed16_t *s, fixed16_t *t) | ||
36 | { | ||
37 | float wu, wv, temp; | ||
38 | vec3_t end; | ||
39 | |||
40 | if (r_refdef.vrect.width >= r_refdef.vrect.height) | ||
41 | temp = (float)r_refdef.vrect.width; | ||
42 | else | ||
43 | temp = (float)r_refdef.vrect.height; | ||
44 | |||
45 | wu = 8192.0 * (float)(u-((int)vid.width>>1)) / temp; | ||
46 | wv = 8192.0 * (float)(((int)vid.height>>1)-v) / temp; | ||
47 | |||
48 | end[0] = 4096*vpn[0] + wu*vright[0] + wv*vup[0]; | ||
49 | end[1] = 4096*vpn[1] + wu*vright[1] + wv*vup[1]; | ||
50 | end[2] = 4096*vpn[2] + wu*vright[2] + wv*vup[2]; | ||
51 | end[2] *= 3; | ||
52 | VectorNormalizeNoRet (end); | ||
53 | |||
54 | temp = skytime*skyspeed; // TODO: add D_SetupFrame & set this there | ||
55 | *s = (int)((temp + 6*(SKYSIZE/2-1)*end[0]) * 0x10000); | ||
56 | *t = (int)((temp + 6*(SKYSIZE/2-1)*end[1]) * 0x10000); | ||
57 | } | ||
58 | |||
59 | |||
60 | /* | ||
61 | ================= | ||
62 | D_DrawSkyScans8 | ||
63 | ================= | ||
64 | */ | ||
65 | void D_DrawSkyScans8 (espan_t *pspan) | ||
66 | { | ||
67 | int count, spancount, u, v; | ||
68 | unsigned char *pdest; | ||
69 | fixed16_t s, t, snext, tnext, sstep, tstep; | ||
70 | int spancountminus1; | ||
71 | |||
72 | sstep = 0; // keep compiler happy | ||
73 | tstep = 0; // ditto | ||
74 | |||
75 | do | ||
76 | { | ||
77 | pdest = (unsigned char *)((byte *)d_viewbuffer + | ||
78 | (screenwidth * pspan->v) + pspan->u); | ||
79 | |||
80 | count = pspan->count; | ||
81 | |||
82 | // calculate the initial s & t | ||
83 | u = pspan->u; | ||
84 | v = pspan->v; | ||
85 | D_Sky_uv_To_st (u, v, &s, &t); | ||
86 | |||
87 | do | ||
88 | { | ||
89 | if (count >= SKY_SPAN_MAX) | ||
90 | spancount = SKY_SPAN_MAX; | ||
91 | else | ||
92 | spancount = count; | ||
93 | |||
94 | count -= spancount; | ||
95 | |||
96 | if (count) | ||
97 | { | ||
98 | u += spancount; | ||
99 | |||
100 | // calculate s and t at far end of span, | ||
101 | // calculate s and t steps across span by shifting | ||
102 | D_Sky_uv_To_st (u, v, &snext, &tnext); | ||
103 | |||
104 | sstep = (snext - s) >> SKY_SPAN_SHIFT; | ||
105 | tstep = (tnext - t) >> SKY_SPAN_SHIFT; | ||
106 | } | ||
107 | else | ||
108 | { | ||
109 | // calculate s and t at last pixel in span, | ||
110 | // calculate s and t steps across span by division | ||
111 | spancountminus1 = (float)(spancount - 1); | ||
112 | |||
113 | if (spancountminus1 > 0) | ||
114 | { | ||
115 | u += spancountminus1; | ||
116 | D_Sky_uv_To_st (u, v, &snext, &tnext); | ||
117 | |||
118 | sstep = (snext - s) / spancountminus1; | ||
119 | tstep = (tnext - t) / spancountminus1; | ||
120 | } | ||
121 | } | ||
122 | |||
123 | do | ||
124 | { | ||
125 | *pdest++ = r_skysource[((t & R_SKY_TMASK) >> 8) + | ||
126 | ((s & R_SKY_SMASK) >> 16)]; | ||
127 | s += sstep; | ||
128 | t += tstep; | ||
129 | } while (--spancount > 0); | ||
130 | |||
131 | s = snext; | ||
132 | t = tnext; | ||
133 | |||
134 | } while (count > 0); | ||
135 | |||
136 | } while ((pspan = pspan->pnext) != NULL); | ||
137 | } | ||
138 | |||