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 #include "machine.h"
47 #include "types.h"
48 #include "macros.h"
49 #include "vector.h"
50 #include "tgafile.h"
51 #include "trace.h"
52 #include "light.h"
53 #include "shade.h"
54 #include "camera.h"
55 #include "util.h"
56 #include "intersect.h"
57 #include "global.h"
58 #include "ui.h"
59 #include "tachyon_video.h"
60
61 // shared but read-only so could be private too
62 static thr_parms *all_parms;
63 static scenedef scene;
64 static int startx;
65 static int stopx;
66 static int starty;
67 static int stopy;
68 static flt jitterscale;
69 static int totaly;
70
render_one_pixel(int x,int y,unsigned int * local_mbox,unsigned int & serial,int startx,int stopx,int starty,int stopy)71 static color_t render_one_pixel (int x, int y, unsigned int *local_mbox, unsigned int &serial,
72 int startx, int stopx, int starty, int stopy)
73 {
74 /* private vars moved inside loop */
75 ray primary;
76 color col;
77 int R,G,B;
78 intersectstruct local_intersections;
79 /* end private */
80
81 primary = camray(&scene, x, y);
82 primary.intstruct = &local_intersections;
83 primary.flags = RT_RAY_REGULAR;
84
85 serial++;
86 primary.serial = serial;
87 primary.mbox = local_mbox;
88 primary.maxdist = FHUGE;
89 primary.scene = &scene;
90 col = trace(&primary);
91 serial = primary.serial;
92
93 /* Handle overexposure and underexposure here... */
94 R = (int)(col.r * 255);
95 if ( R > 255 ) R = 255;
96 else if ( R < 0 ) R = 0;
97
98 G = (int)(col.g * 255);
99 if ( G > 255 ) G = 255;
100 else if ( G < 0 ) G = 0;
101
102 B = (int)(col.b * 255);
103 if ( B > 255 ) B = 255;
104 else if ( B < 0 ) B = 0;
105
106 return video->get_color(R, G, B);
107 }
108
109 #if DO_ITT_NOTIFY
110 #include"ittnotify.h"
111 #endif
112
113 #define RUNTIME_SERIAL 1
114 #define RUNTIME_OPENMP 2
115 #define RUNTIME_CILK 3
116 #define RUNTIME_TBB 4
117
118 #ifndef RUNTIME
119 #define RUNTIME RUNTIME_TBB
120 #endif
121
122 #if RUNTIME == RUNTIME_OPENMP
123 #include <omp.h>
124 #elif RUNTIME == RUNTIME_TBB
125 #include <tbb/tbb.h>
126 #endif
127
parallel_thread(void)128 static void parallel_thread(void)
129 {
130 unsigned int mboxsize = sizeof(unsigned int)*(max_objectid() + 20);
131 #if RUNTIME == RUNTIME_SERIAL
132 for ( int y = starty; y < stopy; y++ )
133 #elif RUNTIME == RUNTIME_OPENMP
134 #pragma omp parallel for
135 for ( int y = starty; y < stopy; y++ )
136 #elif RUNTIME == RUNTIME_CILK
137 _Cilk_for(int y = starty; y < stopy; y++)
138 #elif RUNTIME == RUNTIME_TBB
139 tbb::parallel_for(starty, stopy, [mboxsize] (int y)
140 #endif
141 {
142 unsigned int serial = 1;
143 unsigned int local_mbox[mboxsize];
144 memset(local_mbox, 0, mboxsize);
145 drawing_area drawing(startx, totaly - y, stopx - startx, 1);
146 for ( int x = startx; x < stopx; x++ ) {
147 color_t c = render_one_pixel(x, y, local_mbox, serial, startx, stopx, starty, stopy);
148 drawing.put_pixel(c);
149 }
150 video->next_frame();
151 }
152 #if RUNTIME == RUNTIME_TBB
153 );
154 #endif
155 }
156
thread_trace(thr_parms * parms)157 void * thread_trace(thr_parms * parms)
158 {
159 // shared but read-only so could be private too
160 all_parms = parms;
161 scene = parms->scene;
162 startx = parms->startx;
163 stopx = parms->stopx;
164 starty = parms->starty;
165 stopy = parms->stopy;
166 jitterscale = 40.0*(scene.hres + scene.vres);
167 totaly = parms->scene.vres - 1;
168
169 #if DO_ITT_NOTIFY
170 __itt_resume();
171 #endif
172 parallel_thread();
173 #if DO_ITT_NOTIFY
174 __itt_pause();
175 #endif
176
177 return(NULL);
178 }
179