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/*
Copyright (c) 2011-2023, Intel Corporation
SPDX-License-Identifier: BSD-3-Clause
*/
#ifdef _MSC_VER
#define _CRT_SECURE_NO_WARNINGS
#define NOMINMAX
#pragma warning(disable : 4244)
#pragma warning(disable : 4305)
#endif
#include "../../common/timing.h"
#include "volume_ispc.h"
#include <algorithm>
#include <cstdlib>
#include <stdio.h>
using namespace ispc;
extern void volume_serial(float density[], int nVoxels[3], const float raster2camera[4][4],
const float camera2world[4][4], int width, int height, float image[]);
/* Write a PPM image file with the image */
static void writePPM(float *buf, int width, int height, const char *fn) {
FILE *fp = fopen(fn, "wb");
if (!fp) {
printf("Couldn't open a file '%s'\n", fn);
exit(1);
}
fprintf(fp, "P6\n");
fprintf(fp, "%d %d\n", width, height);
fprintf(fp, "255\n");
for (int i = 0; i < width * height; ++i) {
float v = buf[i] * 255.f;
if (v < 0.f)
v = 0.f;
else if (v > 255.f)
v = 255.f;
unsigned char c = (unsigned char)v;
for (int j = 0; j < 3; ++j)
fputc(c, fp);
}
fclose(fp);
printf("Wrote image file %s\n", fn);
}
/* Load image and viewing parameters from a camera data file.
FIXME: we should add support to be able to specify viewing parameters
in the program here directly. */
static void loadCamera(const char *fn, int *width, int *height, float raster2camera[4][4], float camera2world[4][4]) {
FILE *f = fopen(fn, "r");
if (!f) {
perror(fn);
exit(1);
}
if (fscanf(f, "%d %d", width, height) != 2) {
fprintf(stderr, "Unexpected end of file in camera file\n");
exit(1);
}
for (int i = 0; i < 4; ++i) {
for (int j = 0; j < 4; ++j) {
if (fscanf(f, "%f", &raster2camera[i][j]) != 1) {
fprintf(stderr, "Unexpected end of file in camera file\n");
exit(1);
}
}
}
for (int i = 0; i < 4; ++i) {
for (int j = 0; j < 4; ++j) {
if (fscanf(f, "%f", &camera2world[i][j]) != 1) {
fprintf(stderr, "Unexpected end of file in camera file\n");
exit(1);
}
}
}
fclose(f);
}
/* Load a volume density file. Expects the number of x, y, and z samples
as the first three values (as integer strings), then x*y*z
floating-point values (also as strings) to give the densities. */
static float *loadVolume(const char *fn, int n[3]) {
FILE *f = fopen(fn, "r");
if (!f) {
perror(fn);
exit(1);
}
if (fscanf(f, "%d %d %d", &n[0], &n[1], &n[2]) != 3) {
fprintf(stderr, "Couldn't find resolution at start of density file\n");
fclose(f);
exit(1);
}
int count = n[0] * n[1] * n[2];
float *v = new float[count];
for (int i = 0; i < count; ++i) {
if (fscanf(f, "%f", &v[i]) != 1) {
fprintf(stderr, "Unexpected end of file at %d'th density value\n", i);
fclose(f);
exit(1);
}
}
fclose(f);
return v;
}
int main(int argc, char *argv[]) {
static unsigned int test_iterations[] = {3, 7, 1};
if (argc < 3) {
fprintf(stderr, "usage: volume <camera.dat> <volume_density.vol> [ispc iterations] [tasks iterations] [serial "
"iterations]\n");
return 1;
}
if (argc == 6) {
for (int i = 0; i < 3; i++) {
test_iterations[i] = atoi(argv[3 + i]);
}
}
//
// Load viewing data and the volume density data
//
int width, height;
float raster2camera[4][4], camera2world[4][4];
loadCamera(argv[1], &width, &height, raster2camera, camera2world);
float *image = new float[width * height];
int n[3];
float *density = loadVolume(argv[2], n);
//
// Compute the image using the ispc implementation; report the minimum
// time of three runs.
//
double minISPC = 1e30;
for (unsigned int i = 0; i < test_iterations[0]; ++i) {
reset_and_start_timer();
volume_ispc(density, n, raster2camera, camera2world, width, height, image);
double dt = get_elapsed_mcycles();
printf("@time of ISPC run:\t\t\t[%.3f] million cycles\n", dt);
minISPC = std::min(minISPC, dt);
}
printf("[volume ispc 1 core]:\t\t[%.3f] million cycles\n", minISPC);
writePPM(image, width, height, "volume-ispc-1core.ppm");
// Clear out the buffer
for (int i = 0; i < width * height; ++i)
image[i] = 0.;
//
// Compute the image using the ispc implementation that also uses
// tasks; report the minimum time of three runs.
//
double minISPCtasks = 1e30;
for (unsigned int i = 0; i < test_iterations[1]; ++i) {
reset_and_start_timer();
volume_ispc_tasks(density, n, raster2camera, camera2world, width, height, image);
double dt = get_elapsed_mcycles();
printf("@time of ISPC + TASKS run:\t\t\t[%.3f] million cycles\n", dt);
minISPCtasks = std::min(minISPCtasks, dt);
}
printf("[volume ispc + tasks]:\t\t[%.3f] million cycles\n", minISPCtasks);
writePPM(image, width, height, "volume-ispc-tasks.ppm");
// Clear out the buffer
for (int i = 0; i < width * height; ++i)
image[i] = 0.;
//
// And run the serial implementation 3 times, again reporting the
// minimum time.
//
double minSerial = 1e30;
for (unsigned int i = 0; i < test_iterations[2]; ++i) {
reset_and_start_timer();
volume_serial(density, n, raster2camera, camera2world, width, height, image);
double dt = get_elapsed_mcycles();
printf("@time of serial run:\t\t\t[%.3f] million cycles\n", dt);
minSerial = std::min(minSerial, dt);
}
printf("[volume serial]:\t\t[%.3f] million cycles\n", minSerial);
writePPM(image, width, height, "volume-serial.ppm");
printf("\t\t\t\t(%.2fx speedup from ISPC, %.2fx speedup from ISPC + tasks)\n", minSerial / minISPC,
minSerial / minISPCtasks);
return 0;
}
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