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/*
Copyright (c) 2005-2021 Intel Corporation
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/*
The original source for this example is
Copyright (c) 1994-2008 John E. Stone
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. The name of the author may not be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
#include "machine.hpp"
#include "types.hpp"
#include "macros.hpp"
#include "vector.hpp"
#include "tgafile.hpp"
#include "trace.hpp"
#include "light.hpp"
#include "shade.hpp"
#include "camera.hpp"
#include "util.hpp"
#include "intersect.hpp"
#include "global.hpp"
#include "ui.hpp"
#include "tachyon_video.hpp"
// shared but read-only so could be private too
static thr_parms *all_parms;
static scenedef scene;
static int startx;
static int stopx;
static int starty;
static int stopy;
static flt jitterscale;
static int totaly;
#include "oneapi/tbb/parallel_for.h"
#include "oneapi/tbb/spin_mutex.h"
#include "oneapi/tbb/blocked_range.h"
#include "oneapi/tbb/global_control.h"
#include "common/utility/get_default_num_threads.hpp"
static oneapi::tbb::spin_mutex MyMutex, MyMutex2;
static color_t render_one_pixel(int x,
int y,
unsigned int *local_mbox,
unsigned int &serial,
int startx,
int stopx,
int starty,
int stopy) {
/* private vars moved inside loop */
ray primary, sample;
color col, avcol;
int R, G, B;
intersectstruct local_intersections;
int alias;
/* end private */
primary = camray(&scene, x, y);
primary.intstruct = &local_intersections;
primary.flags = RT_RAY_REGULAR;
serial++;
primary.serial = serial;
primary.mbox = local_mbox;
primary.maxdist = FHUGE;
primary.scene = &scene;
col = trace(&primary);
serial = primary.serial;
/* perform antialiasing if enabled.. */
if (scene.antialiasing > 0) {
for (alias = 0; alias < scene.antialiasing; alias++) {
serial++; /* increment serial number */
sample = primary; /* copy the regular primary ray to start with */
sample.serial = serial;
{
oneapi::tbb::spin_mutex::scoped_lock lock(MyMutex);
sample.d.x += ((rand() % 100) - 50) / jitterscale;
sample.d.y += ((rand() % 100) - 50) / jitterscale;
sample.d.z += ((rand() % 100) - 50) / jitterscale;
}
avcol = trace(&sample);
serial = sample.serial; /* update our overall serial # */
col.r += avcol.r;
col.g += avcol.g;
col.b += avcol.b;
}
col.r /= (scene.antialiasing + 1.0);
col.g /= (scene.antialiasing + 1.0);
col.b /= (scene.antialiasing + 1.0);
}
/* Handle overexposure and underexposure here... */
R = (int)(col.r * 255);
if (R > 255)
R = 255;
else if (R < 0)
R = 0;
G = (int)(col.g * 255);
if (G > 255)
G = 255;
else if (G < 0)
G = 0;
B = (int)(col.b * 255);
if (B > 255)
B = 255;
else if (B < 0)
B = 0;
return video->get_color(R, G, B);
}
class parallel_task {
public:
void operator()(const oneapi::tbb::blocked_range<int> &r) const {
// task-local storage
unsigned int serial = 1;
unsigned int mboxsize = sizeof(unsigned int) * (max_objectid() + 20);
unsigned int *local_mbox = (unsigned int *)alloca(mboxsize);
memset(local_mbox, 0, mboxsize);
for (int y = r.begin(); y != r.end(); ++y) {
{
drawing_area drawing(startx, totaly - y, stopx - startx, 1);
for (int x = startx; x < stopx; x++) {
color_t c =
render_one_pixel(x, y, local_mbox, serial, startx, stopx, starty, stopy);
drawing.put_pixel(c);
}
}
if (!video->next_frame())
return;
}
}
parallel_task() {}
};
void *thread_trace(thr_parms *parms) {
int n, nthreads = utility::get_default_num_threads();
char *nthreads_str = getenv("TBB_NUM_THREADS");
if (nthreads_str && (sscanf(nthreads_str, "%d", &n) > 0) && (n > 0))
nthreads = n;
oneapi::tbb::global_control c(oneapi::tbb::global_control::max_allowed_parallelism, nthreads);
// shared but read-only so could be private too
all_parms = parms;
scene = parms->scene;
startx = parms->startx;
stopx = parms->stopx;
starty = parms->starty;
stopy = parms->stopy;
jitterscale = 40.0 * (scene.hres + scene.vres);
totaly = parms->scene.vres - 1;
int g, grain_size = 1;
char *grain_str = getenv("TBB_GRAINSIZE");
if (grain_str && (sscanf(grain_str, "%d", &g) > 0) && (g > 0))
grain_size = g;
char *sched_str = getenv("TBB_PARTITIONER");
static oneapi::tbb::affinity_partitioner g_ap;
if (sched_str && !strncmp(sched_str, "aff", 3))
oneapi::tbb::parallel_for(
oneapi::tbb::blocked_range<int>(starty, stopy, grain_size), parallel_task(), g_ap);
else if (sched_str && !strncmp(sched_str, "simp", 4))
oneapi::tbb::parallel_for(oneapi::tbb::blocked_range<int>(starty, stopy, grain_size),
parallel_task(),
oneapi::tbb::simple_partitioner());
else
oneapi::tbb::parallel_for(oneapi::tbb::blocked_range<int>(starty, stopy, grain_size),
parallel_task(),
oneapi::tbb::auto_partitioner());
return (nullptr);
}