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-rw-r--r--apps/plugins/sdl/progs/quake/d_edge.c331
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diff --git a/apps/plugins/sdl/progs/quake/d_edge.c b/apps/plugins/sdl/progs/quake/d_edge.c
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1/*
2Copyright (C) 1996-1997 Id Software, Inc.
3
4This program is free software; you can redistribute it and/or
5modify it under the terms of the GNU General Public License
6as published by the Free Software Foundation; either version 2
7of the License, or (at your option) any later version.
8
9This program is distributed in the hope that it will be useful,
10but WITHOUT ANY WARRANTY; without even the implied warranty of
11MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12
13See the GNU General Public License for more details.
14
15You should have received a copy of the GNU General Public License
16along with this program; if not, write to the Free Software
17Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18
19*/
20// d_edge.c
21
22#include "quakedef.h"
23#include "d_local.h"
24
25static int miplevel;
26
27float scale_for_mip;
28int screenwidth;
29int ubasestep, errorterm, erroradjustup, erroradjustdown;
30int vstartscan;
31
32// FIXME: should go away
33extern void R_RotateBmodel (void);
34extern void R_TransformFrustum (void);
35
36vec3_t transformed_modelorg;
37
38/*
39==============
40D_DrawPoly
41
42==============
43*/
44void D_DrawPoly (void)
45{
46// this driver takes spans, not polygons
47}
48
49
50/*
51=============
52D_MipLevelForScale
53=============
54*/
55int D_MipLevelForScale (float scale)
56{
57 int lmiplevel;
58
59 if (scale >= d_scalemip[0] )
60 lmiplevel = 0;
61 else if (scale >= d_scalemip[1] )
62 lmiplevel = 1;
63 else if (scale >= d_scalemip[2] )
64 lmiplevel = 2;
65 else
66 lmiplevel = 3;
67
68 if (lmiplevel < d_minmip)
69 lmiplevel = d_minmip;
70
71 return lmiplevel;
72}
73
74
75/*
76==============
77D_DrawSolidSurface
78==============
79*/
80
81// FIXME: clean this up
82
83void D_DrawSolidSurface (surf_t *surf, int color)
84{
85 espan_t *span;
86 byte *pdest;
87 int u, u2, pix;
88
89 pix = (color<<24) | (color<<16) | (color<<8) | color;
90 for (span=surf->spans ; span ; span=span->pnext)
91 {
92 pdest = (byte *)d_viewbuffer + screenwidth*span->v;
93 u = span->u;
94 u2 = span->u + span->count - 1;
95 ((byte *)pdest)[u] = pix;
96
97 if (u2 - u < 8)
98 {
99 for (u++ ; u <= u2 ; u++)
100 ((byte *)pdest)[u] = pix;
101 }
102 else
103 {
104 for (u++ ; u & 3 ; u++)
105 ((byte *)pdest)[u] = pix;
106
107 u2 -= 4;
108 for ( ; u <= u2 ; u+=4)
109 *(int *)((byte *)pdest + u) = pix;
110 u2 += 4;
111 for ( ; u <= u2 ; u++)
112 ((byte *)pdest)[u] = pix;
113 }
114 }
115}
116
117
118/*
119==============
120D_CalcGradients
121==============
122*/
123void D_CalcGradients (msurface_t *pface)
124{
125 mplane_t *pplane;
126 float mipscale;
127 vec3_t p_temp1;
128 vec3_t p_saxis, p_taxis;
129 float t;
130
131 pplane = pface->plane;
132
133 mipscale = 1.0 / (float)(1 << miplevel);
134
135 TransformVector (pface->texinfo->vecs[0], p_saxis);
136 TransformVector (pface->texinfo->vecs[1], p_taxis);
137
138 t = xscaleinv * mipscale;
139 d_sdivzstepu = p_saxis[0] * t;
140 d_tdivzstepu = p_taxis[0] * t;
141
142 t = yscaleinv * mipscale;
143 d_sdivzstepv = -p_saxis[1] * t;
144 d_tdivzstepv = -p_taxis[1] * t;
145
146 d_sdivzorigin = p_saxis[2] * mipscale - xcenter * d_sdivzstepu -
147 ycenter * d_sdivzstepv;
148 d_tdivzorigin = p_taxis[2] * mipscale - xcenter * d_tdivzstepu -
149 ycenter * d_tdivzstepv;
150
151 VectorScale (transformed_modelorg, mipscale, p_temp1);
152
153 t = 0x10000*mipscale;
154 sadjust = ((fixed16_t)(DotProduct (p_temp1, p_saxis) * 0x10000 + 0.5)) -
155 ((pface->texturemins[0] << 16) >> miplevel)
156 + pface->texinfo->vecs[0][3]*t;
157 tadjust = ((fixed16_t)(DotProduct (p_temp1, p_taxis) * 0x10000 + 0.5)) -
158 ((pface->texturemins[1] << 16) >> miplevel)
159 + pface->texinfo->vecs[1][3]*t;
160
161//
162// -1 (-epsilon) so we never wander off the edge of the texture
163//
164 bbextents = ((pface->extents[0] << 16) >> miplevel) - 1;
165 bbextentt = ((pface->extents[1] << 16) >> miplevel) - 1;
166}
167
168
169/*
170==============
171D_DrawSurfaces
172==============
173*/
174void D_DrawSurfaces (void)
175{
176 surf_t *s;
177 msurface_t *pface;
178 surfcache_t *pcurrentcache;
179 vec3_t world_transformed_modelorg;
180 vec3_t local_modelorg;
181
182 currententity = &cl_entities[0];
183 TransformVector (modelorg, transformed_modelorg);
184 VectorCopy (transformed_modelorg, world_transformed_modelorg);
185
186// TODO: could preset a lot of this at mode set time
187 if (r_drawflat.value)
188 {
189 for (s = &surfaces[1] ; s<surface_p ; s++)
190 {
191 if (!s->spans)
192 continue;
193
194 d_zistepu = s->d_zistepu;
195 d_zistepv = s->d_zistepv;
196 d_ziorigin = s->d_ziorigin;
197
198 D_DrawSolidSurface (s, (int)s->data & 0xFF);
199 D_DrawZSpans (s->spans);
200 }
201 }
202 else
203 {
204 for (s = &surfaces[1] ; s<surface_p ; s++)
205 {
206 if (!s->spans)
207 continue;
208
209 r_drawnpolycount++;
210
211 d_zistepu = s->d_zistepu;
212 d_zistepv = s->d_zistepv;
213 d_ziorigin = s->d_ziorigin;
214
215 if (s->flags & SURF_DRAWSKY)
216 {
217 if (!r_skymade)
218 {
219 R_MakeSky ();
220 }
221
222 D_DrawSkyScans8 (s->spans);
223 D_DrawZSpans (s->spans);
224 }
225 else if (s->flags & SURF_DRAWBACKGROUND)
226 {
227 // set up a gradient for the background surface that places it
228 // effectively at infinity distance from the viewpoint
229 d_zistepu = 0;
230 d_zistepv = 0;
231 d_ziorigin = -0.9;
232
233 D_DrawSolidSurface (s, (int)r_clearcolor.value & 0xFF);
234 D_DrawZSpans (s->spans);
235 }
236 else if (s->flags & SURF_DRAWTURB)
237 {
238 pface = s->data;
239 miplevel = 0;
240 cacheblock = (pixel_t *)
241 ((byte *)pface->texinfo->texture +
242 pface->texinfo->texture->offsets[0]);
243 cachewidth = 64;
244
245 if (s->insubmodel)
246 {
247 // FIXME: we don't want to do all this for every polygon!
248 // TODO: store once at start of frame
249 currententity = s->entity; //FIXME: make this passed in to
250 // R_RotateBmodel ()
251 VectorSubtract (r_origin, currententity->origin,
252 local_modelorg);
253 TransformVector (local_modelorg, transformed_modelorg);
254
255 R_RotateBmodel (); // FIXME: don't mess with the frustum,
256 // make entity passed in
257 }
258
259 D_CalcGradients (pface);
260 Turbulent8 (s->spans);
261 D_DrawZSpans (s->spans);
262
263 if (s->insubmodel)
264 {
265 //
266 // restore the old drawing state
267 // FIXME: we don't want to do this every time!
268 // TODO: speed up
269 //
270 currententity = &cl_entities[0];
271 VectorCopy (world_transformed_modelorg,
272 transformed_modelorg);
273 VectorCopy (base_vpn, vpn);
274 VectorCopy (base_vup, vup);
275 VectorCopy (base_vright, vright);
276 VectorCopy (base_modelorg, modelorg);
277 R_TransformFrustum ();
278 }
279 }
280 else
281 {
282 if (s->insubmodel)
283 {
284 // FIXME: we don't want to do all this for every polygon!
285 // TODO: store once at start of frame
286 currententity = s->entity; //FIXME: make this passed in to
287 // R_RotateBmodel ()
288 VectorSubtract (r_origin, currententity->origin, local_modelorg);
289 TransformVector (local_modelorg, transformed_modelorg);
290
291 R_RotateBmodel (); // FIXME: don't mess with the frustum,
292 // make entity passed in
293 }
294
295 pface = s->data;
296 miplevel = D_MipLevelForScale (s->nearzi * scale_for_mip
297 * pface->texinfo->mipadjust);
298
299 // FIXME: make this passed in to D_CacheSurface
300 pcurrentcache = D_CacheSurface (pface, miplevel);
301
302 cacheblock = (pixel_t *)pcurrentcache->data;
303 cachewidth = pcurrentcache->width;
304
305 D_CalcGradients (pface);
306
307 (*d_drawspans) (s->spans);
308
309 D_DrawZSpans (s->spans);
310
311 if (s->insubmodel)
312 {
313 //
314 // restore the old drawing state
315 // FIXME: we don't want to do this every time!
316 // TODO: speed up
317 //
318 currententity = &cl_entities[0];
319 VectorCopy (world_transformed_modelorg,
320 transformed_modelorg);
321 VectorCopy (base_vpn, vpn);
322 VectorCopy (base_vup, vup);
323 VectorCopy (base_vright, vright);
324 VectorCopy (base_modelorg, modelorg);
325 R_TransformFrustum ();
326 }
327 }
328 }
329 }
330}
331
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