1 /*
2 Copyright (c) 2005-2021 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 #include <omp.h>
47 #include "machine.hpp"
48 #include "types.hpp"
49 #include "macros.hpp"
50 #include "vector.hpp"
51 #include "tgafile.hpp"
52 #include "trace.hpp"
53 #include "light.hpp"
54 #include "shade.hpp"
55 #include "camera.hpp"
56 #include "util.hpp"
57 #include "intersect.hpp"
58 #include "global.hpp"
59 #include "ui.hpp"
60 #include "tachyon_video.hpp"
61
62 // shared but read-only so could be private too
63 static thr_parms *all_parms;
64 static scenedef scene;
65 static int startx;
66 static int stopx;
67 static int starty;
68 static int stopy;
69 static flt jitterscale;
70 static int totaly;
71
render_one_pixel(int x,int y,unsigned int * local_mbox,unsigned int & serial,int startx,int stopx,int starty,int stopy)72 static color_t render_one_pixel(int x,
73 int y,
74 unsigned int *local_mbox,
75 unsigned int &serial,
76 int startx,
77 int stopx,
78 int starty,
79 int stopy) {
80 /* private vars moved inside loop */
81 ray primary, sample;
82 color col, avcol;
83 int R, G, B;
84 intersectstruct local_intersections;
85 int alias;
86 /* end private */
87
88 primary = camray(&scene, x, y);
89 primary.intstruct = &local_intersections;
90 primary.flags = RT_RAY_REGULAR;
91
92 serial++;
93 primary.serial = serial;
94 primary.mbox = local_mbox;
95 primary.maxdist = FHUGE;
96 primary.scene = &scene;
97 col = trace(&primary);
98
99 serial = primary.serial;
100
101 /* perform antialiasing if enabled.. */
102 if (scene.antialiasing > 0) {
103 for (alias = 0; alias < scene.antialiasing; alias++) {
104 serial++; /* increment serial number */
105 sample = primary; /* copy the regular primary ray to start with */
106 sample.serial = serial;
107
108 #pragma omp critical
109 {
110 sample.d.x += ((rand() % 100) - 50) / jitterscale;
111 sample.d.y += ((rand() % 100) - 50) / jitterscale;
112 sample.d.z += ((rand() % 100) - 50) / jitterscale;
113 }
114
115 avcol = trace(&sample);
116
117 serial = sample.serial; /* update our overall serial # */
118
119 col.r += avcol.r;
120 col.g += avcol.g;
121 col.b += avcol.b;
122 }
123
124 col.r /= (scene.antialiasing + 1.0);
125 col.g /= (scene.antialiasing + 1.0);
126 col.b /= (scene.antialiasing + 1.0);
127 }
128
129 /* Handle overexposure and underexposure here... */
130 R = (int)(col.r * 255);
131 if (R > 255)
132 R = 255;
133 else if (R < 0)
134 R = 0;
135
136 G = (int)(col.g * 255);
137 if (G > 255)
138 G = 255;
139 else if (G < 0)
140 G = 0;
141
142 B = (int)(col.b * 255);
143 if (B > 255)
144 B = 255;
145 else if (B < 0)
146 B = 0;
147
148 return video->get_color(R, G, B);
149 }
150
parallel_thread(void)151 static void parallel_thread(void) {
152 // thread-local storage
153 unsigned int serial = 1;
154 unsigned int mboxsize = sizeof(unsigned int) * (max_objectid() + 20);
155 unsigned int *local_mbox = (unsigned int *)alloca(mboxsize);
156 memset(local_mbox, 0, mboxsize);
157
158 #pragma omp for nowait schedule(runtime)
159 for (int y = starty; y < stopy; y++) {
160 if (!video->running)
161 continue;
162 drawing_area drawing(startx, totaly - y, stopx - startx, 1);
163 for (int x = startx; x < stopx; x++) {
164 color_t c = render_one_pixel(x, y, local_mbox, serial, startx, stopx, starty, stopy);
165 drawing.put_pixel(c);
166 }
167 video->next_frame();
168 }
169 }
170
thread_trace(thr_parms * parms)171 void *thread_trace(thr_parms *parms) {
172 // shared but read-only so could be private too
173 all_parms = parms;
174 scene = parms->scene;
175 startx = parms->startx;
176 stopx = parms->stopx;
177 starty = parms->starty;
178 stopy = parms->stopy;
179 jitterscale = 40.0 * (scene.hres + scene.vres);
180 totaly = parms->scene.vres - 1;
181
182 #pragma omp parallel
183 parallel_thread();
184
185 return (nullptr);
186 }
187