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added cuda examples

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Evghenii
2013-11-04 11:44:49 +01:00
parent cb6614da42
commit cb7cbec0d5
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2
examples_cuda/aobench/.gitignore vendored Normal file
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ao
*.ppm

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examples_cuda/aobench/Makefile Normal file
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EXAMPLE=ao
CPP_SRC=ao.cpp ao_serial.cpp
ISPC_SRC=ao.ispc
ISPC_IA_TARGETS=sse2,sse4,avx
ISPC_ARM_TARGETS=neon
include ../common.mk

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examples_cuda/aobench/ao.cpp Normal file
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/*
Copyright (c) 2010-2011, Intel Corporation
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* 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.
* Neither the name of Intel Corporation nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER
OR CONTRIBUTORS 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.
*/
#ifdef _MSC_VER
#define _CRT_SECURE_NO_WARNINGS
#define NOMINMAX
#pragma warning (disable: 4244)
#pragma warning (disable: 4305)
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#ifdef __linux__
#include <malloc.h>
#endif
#include <math.h>
#include <map>
#include <string>
#include <algorithm>
#include <sys/types.h>
#include "ao_ispc.h"
using namespace ispc;
#include "../timing.h"
#define NSUBSAMPLES 2
extern void ao_serial(int w, int h, int nsubsamples, float image[]);
static unsigned int test_iterations;
static unsigned int width, height;
static unsigned char *img;
static float *fimg;
static unsigned char
clamp(float f)
{
int i = (int)(f * 255.5);
if (i < 0) i = 0;
if (i > 255) i = 255;
return (unsigned char)i;
}
static void
savePPM(const char *fname, int w, int h)
{
for (int y = 0; y < h; y++) {
for (int x = 0; x < w; x++) {
img[3 * (y * w + x) + 0] = clamp(fimg[3 *(y * w + x) + 0]);
img[3 * (y * w + x) + 1] = clamp(fimg[3 *(y * w + x) + 1]);
img[3 * (y * w + x) + 2] = clamp(fimg[3 *(y * w + x) + 2]);
}
}
FILE *fp = fopen(fname, "wb");
if (!fp) {
perror(fname);
exit(1);
}
fprintf(fp, "P6\n");
fprintf(fp, "%d %d\n", w, h);
fprintf(fp, "255\n");
fwrite(img, w * h * 3, 1, fp);
fclose(fp);
printf("Wrote image file %s\n", fname);
}
int main(int argc, char **argv)
{
if (argc != 4) {
printf ("%s\n", argv[0]);
printf ("Usage: ao [num test iterations] [width] [height]\n");
getchar();
exit(-1);
}
else {
test_iterations = atoi(argv[1]);
width = atoi (argv[2]);
height = atoi (argv[3]);
}
// Allocate space for output images
img = new unsigned char[width * height * 3];
fimg = new float[width * height * 3];
//
// Run the ispc path, test_iterations times, and report the minimum
// time for any of them.
//
double minTimeISPC = 1e30;
for (unsigned int i = 0; i < test_iterations; i++) {
memset((void *)fimg, 0, sizeof(float) * width * height * 3);
assert(NSUBSAMPLES == 2);
reset_and_start_timer();
ao_ispc(width, height, NSUBSAMPLES, fimg);
double t = get_elapsed_mcycles();
minTimeISPC = std::min(minTimeISPC, t);
}
// Report results and save image
printf("[aobench ispc]:\t\t\t[%.3f] million cycles (%d x %d image)\n",
minTimeISPC, width, height);
savePPM("ao-ispc.ppm", width, height);
//
// Run the ispc + tasks path, test_iterations times, and report the
// minimum time for any of them.
//
double minTimeISPCTasks = 1e30;
for (unsigned int i = 0; i < test_iterations; i++) {
memset((void *)fimg, 0, sizeof(float) * width * height * 3);
assert(NSUBSAMPLES == 2);
reset_and_start_timer();
ao_ispc_tasks(width, height, NSUBSAMPLES, fimg);
double t = get_elapsed_mcycles();
minTimeISPCTasks = std::min(minTimeISPCTasks, t);
}
// Report results and save image
printf("[aobench ispc + tasks]:\t\t[%.3f] million cycles (%d x %d image)\n",
minTimeISPCTasks, width, height);
savePPM("ao-ispc-tasks.ppm", width, height);
//
// Run the serial path, again test_iteration times, and report the
// minimum time.
//
double minTimeSerial = 1e30;
for (unsigned int i = 0; i < test_iterations; i++) {
memset((void *)fimg, 0, sizeof(float) * width * height * 3);
reset_and_start_timer();
ao_serial(width, height, NSUBSAMPLES, fimg);
double t = get_elapsed_mcycles();
minTimeSerial = std::min(minTimeSerial, t);
}
// Report more results, save another image...
printf("[aobench serial]:\t\t[%.3f] million cycles (%d x %d image)\n", minTimeSerial,
width, height);
printf("\t\t\t\t(%.2fx speedup from ISPC, %.2fx speedup from ISPC + tasks)\n",
minTimeSerial / minTimeISPC, minTimeSerial / minTimeISPCTasks);
savePPM("ao-serial.ppm", width, height);
return 0;
}

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examples_cuda/aobench/ao.ispc Normal file
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// -*- mode: c++ -*-
/*
Copyright (c) 2010-2011, Intel Corporation
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* 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.
* Neither the name of Intel Corporation nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER
OR CONTRIBUTORS 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.
*/
/*
Based on Syoyo Fujita's aobench: http://code.google.com/p/aobench
*/
#define NAO_SAMPLES 8
#define M_PI 3.1415926535f
typedef float<3> vec;
struct Isect {
float t;
vec p;
vec n;
int hit;
};
struct Sphere {
vec center;
float radius;
};
struct Plane {
vec p;
vec n;
};
struct Ray {
vec org;
vec dir;
};
static inline float dot(vec a, vec b) {
return a.x * b.x + a.y * b.y + a.z * b.z;
}
static inline vec vcross(vec v0, vec v1) {
vec ret;
ret.x = v0.y * v1.z - v0.z * v1.y;
ret.y = v0.z * v1.x - v0.x * v1.z;
ret.z = v0.x * v1.y - v0.y * v1.x;
return ret;
}
static inline void vnormalize(vec &v) {
float len2 = dot(v, v);
float invlen = rsqrt(len2);
v *= invlen;
}
static void
ray_plane_intersect(Isect &isect, Ray &ray, uniform Plane &plane) {
float d = -dot(plane.p, plane.n);
float v = dot(ray.dir, plane.n);
cif (abs(v) < 1.0e-17)
return;
else {
float t = -(dot(ray.org, plane.n) + d) / v;
cif ((t > 0.0) && (t < isect.t)) {
isect.t = t;
isect.hit = 1;
isect.p = ray.org + ray.dir * t;
isect.n = plane.n;
}
}
}
static inline void
ray_sphere_intersect(Isect &isect, Ray &ray, uniform Sphere &sphere) {
vec rs = ray.org - sphere.center;
float B = dot(rs, ray.dir);
float C = dot(rs, rs) - sphere.radius * sphere.radius;
float D = B * B - C;
cif (D > 0.) {
float t = -B - sqrt(D);
cif ((t > 0.0) && (t < isect.t)) {
isect.t = t;
isect.hit = 1;
isect.p = ray.org + t * ray.dir;
isect.n = isect.p - sphere.center;
vnormalize(isect.n);
}
}
}
static void
orthoBasis(vec basis[3], vec n) {
basis[2] = n;
basis[1].x = 0.0; basis[1].y = 0.0; basis[1].z = 0.0;
if ((n.x < 0.6) && (n.x > -0.6)) {
basis[1].x = 1.0;
} else if ((n.y < 0.6) && (n.y > -0.6)) {
basis[1].y = 1.0;
} else if ((n.z < 0.6) && (n.z > -0.6)) {
basis[1].z = 1.0;
} else {
basis[1].x = 1.0;
}
basis[0] = vcross(basis[1], basis[2]);
vnormalize(basis[0]);
basis[1] = vcross(basis[2], basis[0]);
vnormalize(basis[1]);
}
static float
ambient_occlusion(Isect &isect, uniform Plane &plane, uniform Sphere spheres[3],
RNGState &rngstate) {
float eps = 0.0001f;
vec p, n;
vec basis[3];
float occlusion = 0.0;
p = isect.p + eps * isect.n;
orthoBasis(basis, isect.n);
static const uniform int ntheta = NAO_SAMPLES;
static const uniform int nphi = NAO_SAMPLES;
for (uniform int j = 0; j < ntheta; j++) {
for (uniform int i = 0; i < nphi; i++) {
Ray ray;
Isect occIsect;
float theta = sqrt(frandom(&rngstate));
float phi = 2.0f * M_PI * frandom(&rngstate);
float x = cos(phi) * theta;
float y = sin(phi) * theta;
float z = sqrt(1.0 - theta * theta);
// local . global
float rx = x * basis[0].x + y * basis[1].x + z * basis[2].x;
float ry = x * basis[0].y + y * basis[1].y + z * basis[2].y;
float rz = x * basis[0].z + y * basis[1].z + z * basis[2].z;
ray.org = p;
ray.dir.x = rx;
ray.dir.y = ry;
ray.dir.z = rz;
occIsect.t = 1.0e+17;
occIsect.hit = 0;
for (uniform int snum = 0; snum < 3; ++snum)
ray_sphere_intersect(occIsect, ray, spheres[snum]);
ray_plane_intersect (occIsect, ray, plane);
if (occIsect.hit) occlusion += 1.0;
}
}
occlusion = (ntheta * nphi - occlusion) / (float)(ntheta * nphi);
return occlusion;
}
/* Compute the image for the scanlines from [y0,y1), for an overall image
of width w and height h.
*/
static void ao_scanlines(uniform int y0, uniform int y1, uniform int w,
uniform int h, uniform int nsubsamples,
uniform float image[]) {
static uniform Plane plane = { { 0.0f, -0.5f, 0.0f }, { 0.f, 1.f, 0.f } };
static uniform Sphere spheres[3] = {
{ { -2.0f, 0.0f, -3.5f }, 0.5f },
{ { -0.5f, 0.0f, -3.0f }, 0.5f },
{ { 1.0f, 0.0f, -2.2f }, 0.5f } };
RNGState rngstate;
seed_rng(&rngstate, programIndex + (y0 << (programIndex & 15)));
float invSamples = 1.f / nsubsamples;
foreach_tiled(y = y0 ... y1, x = 0 ... w,
u = 0 ... nsubsamples, v = 0 ... nsubsamples) {
float du = (float)u * invSamples, dv = (float)v * invSamples;
// Figure out x,y pixel in NDC
float px = (x + du - (w / 2.0f)) / (w / 2.0f);
float py = -(y + dv - (h / 2.0f)) / (h / 2.0f);
float ret = 0.f;
Ray ray;
Isect isect;
ray.org = 0.f;
// Poor man's perspective projection
ray.dir.x = px;
ray.dir.y = py;
ray.dir.z = -1.0;
vnormalize(ray.dir);
isect.t = 1.0e+17;
isect.hit = 0;
for (uniform int snum = 0; snum < 3; ++snum)
ray_sphere_intersect(isect, ray, spheres[snum]);
ray_plane_intersect(isect, ray, plane);
// Note use of 'coherent' if statement; the set of rays we
// trace will often all hit or all miss the scene
cif (isect.hit) {
ret = ambient_occlusion(isect, plane, spheres, rngstate);
ret *= invSamples * invSamples;
int offset = 3 * (y * w + x);
atomic_add_local(&image[offset], ret);
atomic_add_local(&image[offset+1], ret);
atomic_add_local(&image[offset+2], ret);
}
}
}
export void ao_ispc(uniform int w, uniform int h, uniform int nsubsamples,
uniform float image[]) {
ao_scanlines(0, h, w, h, nsubsamples, image);
}
static void task ao_task(uniform int width, uniform int height,
uniform int nsubsamples, uniform float image[]) {
ao_scanlines(taskIndex, taskIndex+1, width, height, nsubsamples, image);
}
export void ao_ispc_tasks(uniform int w, uniform int h, uniform int nsubsamples,
uniform float image[]) {
launch[h] ao_task(w, h, nsubsamples, image);
}

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// -*- mode: c++ -*-
/*
Copyright (c) 2010-2011, Intel Corporation
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* 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.
* Neither the name of Intel Corporation nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER
OR CONTRIBUTORS 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.
*/
/*
Based on Syoyo Fujita's aobench: http://code.google.com/p/aobench
*/
#ifdef _MSC_VER
#define _CRT_SECURE_NO_WARNINGS
#define NOMINMAX
#pragma warning (disable: 4244)
#pragma warning (disable: 4305)
#endif
#include <stdlib.h>
#include <math.h>
#ifdef _MSC_VER
static long long drand48_x = 0x1234ABCD330E;
static inline void srand48(int x) {
drand48_x = x ^ (x << 16);
}
static inline double drand48() {
drand48_x = drand48_x * 0x5DEECE66D + 0xB;
return (drand48_x & 0xFFFFFFFFFFFF) * (1.0 / 281474976710656.0);
}
#endif // _MSC_VER
#ifdef _MSC_VER
__declspec(align(16))
#endif
struct vec {
vec() { x=y=z=pad=0.; }
vec(float xx, float yy, float zz) { x = xx; y = yy; z = zz; }
vec operator*(float f) const { return vec(x*f, y*f, z*f); }
vec operator+(const vec &f2) const {
return vec(x+f2.x, y+f2.y, z+f2.z);
}
vec operator-(const vec &f2) const {
return vec(x-f2.x, y-f2.y, z-f2.z);
}
vec operator*(const vec &f2) const {
return vec(x*f2.x, y*f2.y, z*f2.z);
}
float x, y, z;
float pad;
}
#ifndef _MSC_VER
__attribute__ ((aligned(16)))
#endif
;
inline vec operator*(float f, const vec &v) { return vec(f*v.x, f*v.y, f*v.z); }
#define NAO_SAMPLES 8
#ifdef M_PI
#undef M_PI
#endif
#define M_PI 3.1415926535f
struct Isect {
float t;
vec p;
vec n;
int hit;
};
struct Sphere {
vec center;
float radius;
};
struct Plane {
vec p;
vec n;
};
struct Ray {
vec org;
vec dir;
};
static inline float dot(const vec &a, const vec &b) {
return a.x * b.x + a.y * b.y + a.z * b.z;
}
static inline vec vcross(const vec &v0, const vec &v1) {
vec ret;
ret.x = v0.y * v1.z - v0.z * v1.y;
ret.y = v0.z * v1.x - v0.x * v1.z;
ret.z = v0.x * v1.y - v0.y * v1.x;
return ret;
}
static inline void vnormalize(vec &v) {
float len2 = dot(v, v);
float invlen = 1.f / sqrtf(len2);
v = v * invlen;
}
static inline void
ray_plane_intersect(Isect &isect, Ray &ray,
Plane &plane) {
float d = -dot(plane.p, plane.n);
float v = dot(ray.dir, plane.n);
if (fabsf(v) < 1.0e-17f)
return;
else {
float t = -(dot(ray.org, plane.n) + d) / v;
if ((t > 0.0) && (t < isect.t)) {
isect.t = t;
isect.hit = 1;
isect.p = ray.org + ray.dir * t;
isect.n = plane.n;
}
}
}
static inline void
ray_sphere_intersect(Isect &isect, Ray &ray,
Sphere &sphere) {
vec rs = ray.org - sphere.center;
float B = dot(rs, ray.dir);
float C = dot(rs, rs) - sphere.radius * sphere.radius;
float D = B * B - C;
if (D > 0.) {
float t = -B - sqrtf(D);
if ((t > 0.0) && (t < isect.t)) {
isect.t = t;
isect.hit = 1;
isect.p = ray.org + t * ray.dir;
isect.n = isect.p - sphere.center;
vnormalize(isect.n);
}
}
}
static inline void
orthoBasis(vec basis[3], const vec &n) {
basis[2] = n;
basis[1].x = 0.0; basis[1].y = 0.0; basis[1].z = 0.0;
if ((n.x < 0.6f) && (n.x > -0.6f)) {
basis[1].x = 1.0;
} else if ((n.y < 0.6f) && (n.y > -0.6f)) {
basis[1].y = 1.0;
} else if ((n.z < 0.6f) && (n.z > -0.6f)) {
basis[1].z = 1.0;
} else {
basis[1].x = 1.0;
}
basis[0] = vcross(basis[1], basis[2]);
vnormalize(basis[0]);
basis[1] = vcross(basis[2], basis[0]);
vnormalize(basis[1]);
}
static float
ambient_occlusion(Isect &isect, Plane &plane,
Sphere spheres[3]) {
float eps = 0.0001f;
vec p, n;
vec basis[3];
float occlusion = 0.0;
p = isect.p + eps * isect.n;
orthoBasis(basis, isect.n);
static const int ntheta = NAO_SAMPLES;
static const int nphi = NAO_SAMPLES;
for (int j = 0; j < ntheta; j++) {
for (int i = 0; i < nphi; i++) {
Ray ray;
Isect occIsect;
float theta = sqrtf(drand48());
float phi = 2.0f * M_PI * drand48();
float x = cosf(phi) * theta;
float y = sinf(phi) * theta;
float z = sqrtf(1.0f - theta * theta);
// local . global
float rx = x * basis[0].x + y * basis[1].x + z * basis[2].x;
float ry = x * basis[0].y + y * basis[1].y + z * basis[2].y;
float rz = x * basis[0].z + y * basis[1].z + z * basis[2].z;
ray.org = p;
ray.dir.x = rx;
ray.dir.y = ry;
ray.dir.z = rz;
occIsect.t = 1.0e+17f;
occIsect.hit = 0;
for (int snum = 0; snum < 3; ++snum)
ray_sphere_intersect(occIsect, ray, spheres[snum]);
ray_plane_intersect (occIsect, ray, plane);
if (occIsect.hit) occlusion += 1.f;
}
}
occlusion = (ntheta * nphi - occlusion) / (float)(ntheta * nphi);
return occlusion;
}
/* Compute the image for the scanlines from [y0,y1), for an overall image
of width w and height h.
*/
static void ao_scanlines(int y0, int y1, int w, int h, int nsubsamples,
float image[]) {
static Plane plane = { vec(0.0f, -0.5f, 0.0f), vec(0.f, 1.f, 0.f) };
static Sphere spheres[3] = {
{ vec(-2.0f, 0.0f, -3.5f), 0.5f },
{ vec(-0.5f, 0.0f, -3.0f), 0.5f },
{ vec(1.0f, 0.0f, -2.2f), 0.5f } };
srand48(y0);
for (int y = y0; y < y1; ++y) {
for (int x = 0; x < w; ++x) {
int offset = 3 * (y * w + x);
for (int u = 0; u < nsubsamples; ++u) {
for (int v = 0; v < nsubsamples; ++v) {
float px = (x + (u / (float)nsubsamples) - (w / 2.0f)) / (w / 2.0f);
float py = -(y + (v / (float)nsubsamples) - (h / 2.0f)) / (h / 2.0f);
float ret = 0.f;
Ray ray;
Isect isect;
ray.org = vec(0.f, 0.f, 0.f);
ray.dir.x = px;
ray.dir.y = py;
ray.dir.z = -1.0f;
vnormalize(ray.dir);
isect.t = 1.0e+17f;
isect.hit = 0;
for (int snum = 0; snum < 3; ++snum)
ray_sphere_intersect(isect, ray, spheres[snum]);
ray_plane_intersect(isect, ray, plane);
if (isect.hit)
ret = ambient_occlusion(isect, plane, spheres);
// Update image for AO for this ray
image[offset+0] += ret;
image[offset+1] += ret;
image[offset+2] += ret;
}
}
// Normalize image pixels by number of samples taken per pixel
image[offset+0] /= nsubsamples * nsubsamples;
image[offset+1] /= nsubsamples * nsubsamples;
image[offset+2] /= nsubsamples * nsubsamples;
}
}
}
void ao_serial(int w, int h, int nsubsamples,
float image[]) {
ao_scanlines(0, h, w, h, nsubsamples, image);
}

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<?xml version="1.0" encoding="utf-8"?>
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