1 /*
2     Copyright (c) 2005-2020 Intel Corporation
3 
4     Licensed under the Apache License, Version 2.0 (the "License");
5     you may not use this file except in compliance with the License.
6     You may obtain a copy of the License at
7 
8         http://www.apache.org/licenses/LICENSE-2.0
9 
10     Unless required by applicable law or agreed to in writing, software
11     distributed under the License is distributed on an "AS IS" BASIS,
12     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13     See the License for the specific language governing permissions and
14     limitations under the License.
15 */
16 
17 /*
18     The original source for this example is
19     Copyright (c) 1994-2008 John E. Stone
20     All rights reserved.
21 
22     Redistribution and use in source and binary forms, with or without
23     modification, are permitted provided that the following conditions
24     are met:
25     1. Redistributions of source code must retain the above copyright
26        notice, this list of conditions and the following disclaimer.
27     2. Redistributions in binary form must reproduce the above copyright
28        notice, this list of conditions and the following disclaimer in the
29        documentation and/or other materials provided with the distribution.
30     3. The name of the author may not be used to endorse or promote products
31        derived from this software without specific prior written permission.
32 
33     THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
34     OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
35     WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
36     ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
37     DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
38     DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
39     OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
40     HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
41     LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
42     OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
43     SUCH DAMAGE.
44 */
45 
46 /*
47  * trace.cpp - This file contains the functions for firing primary rays
48  *           and handling subsequent calculations
49  */
50 
51 #include "machine.hpp"
52 #include "types.hpp"
53 #include "macros.hpp"
54 #include "vector.hpp"
55 #include "tgafile.hpp"
56 #include "trace.hpp"
57 #include "light.hpp"
58 #include "shade.hpp"
59 #include "camera.hpp"
60 #include "util.hpp"
61 #include "intersect.hpp"
62 #include "global.hpp"
63 #include "ui.hpp"
64 #include "tachyon_video.hpp"
65 
66 color trace(ray *primary) {
67     if (primary->depth > 0) {
68         VNorm(&primary->d);
69         reset_intersection(primary->intstruct);
70         intersect_objects(primary);
71         return shader(primary);
72     }
73 
74     /* if ray is truncated, return the background as its color */
75     return primary->scene->background;
76 }
77 
78 void *thread_io(void *parms) {
79     thr_io_parms p;
80 
81     p = *((thr_io_parms *)parms);
82     writetgaregion(p.tga, p.iwidth, p.iheight, p.startx, p.starty, p.stopx, p.stopy, p.buffer);
83     free(p.buffer); /* free the buffer once we are done with it.. */
84     free(parms);
85 
86     return (nullptr);
87 }
88 
89 void trace_shm(scenedef scene, /*char * buffer,  */ int startx, int stopx, int starty, int stopy) {
90     thr_parms *parms;
91 
92     parms = (thr_parms *)rt_getmem(sizeof(thr_parms));
93 
94     parms->tid = 0;
95     parms->nthr = 1;
96     parms->scene = scene;
97     parms->startx = startx;
98     parms->stopx = stopx;
99     parms->starty = starty;
100     parms->stopy = stopy;
101 
102     thread_trace(parms);
103 
104     rt_freemem(parms);
105 }
106 
107 void trace_region(scenedef scene, void *tga, int startx, int starty, int stopx, int stopy) {
108     if (scene.verbosemode) {
109         char msgtxt[2048];
110         sprintf(msgtxt,
111                 "Node %3d tracing region  %4d, %4d  --->  %4d, %4d \n",
112                 0,
113                 startx,
114                 starty,
115                 stopx,
116                 stopy);
117         rt_ui_message(MSG_0, msgtxt);
118     }
119 
120     trace_shm(scene, /*buffer,*/ startx, stopx, starty, stopy);
121     /* not used now
122   writetgaregion(tga, scene.hres, scene.vres,
123                  startx, starty, stopx, stopy, global_buffer);
124 
125   if (scene.rawimage != nullptr) {
126     int x, y;
127     int totalx = stopx - startx + 1;
128     for (y=starty; y<=stopy; y++) {
129       for (x=0; x<scene.hres; x++) {
130         scene.rawimage[(scene.vres-y)*scene.hres*3 + x*3] = global_buffer[(y-starty)*totalx*3 + x*3 + 2];
131         scene.rawimage[(scene.vres-y)*scene.hres*3 + x*3 +1] = global_buffer[(y-starty)*totalx*3 + x*3 + 1];
132         scene.rawimage[(scene.vres-y)*scene.hres*3 + x*3 +2] = global_buffer[(y-starty)*totalx*3 + x*3];
133       }
134     }
135   }
136 */
137 }
138