99221f7d17
fp constant undesirably causing computation to be done in double precision. Makes C scalar versions of the options pricing models, rt, and aobench 3-5% faster. Makes scalar version of noise about 15% faster. Others are unchanged.
315 lines
8.6 KiB
C++
315 lines
8.6 KiB
C++
// -*- mode: c++ -*-
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/*
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Copyright (c) 2010-2011, Intel Corporation
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of Intel Corporation nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
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OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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Based on Syoyo Fujita's aobench: http://code.google.com/p/aobench
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*/
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#ifdef _MSC_VER
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#define _CRT_SECURE_NO_WARNINGS
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#define NOMINMAX
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#pragma warning (disable: 4244)
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#pragma warning (disable: 4305)
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#endif
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#include <stdlib.h>
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#include <math.h>
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#ifdef _MSC_VER
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static long long drand48_x = 0x1234ABCD330E;
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static inline void srand48(int x) {
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drand48_x = x ^ (x << 16);
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}
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static inline double drand48() {
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drand48_x = drand48_x * 0x5DEECE66D + 0xB;
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return (drand48_x & 0xFFFFFFFFFFFF) * (1.0 / 281474976710656.0);
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}
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#endif // _MSC_VER
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#ifdef _MSC_VER
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__declspec(align(16))
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#endif
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struct vec {
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vec() { x=y=z=pad=0.; }
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vec(float xx, float yy, float zz) { x = xx; y = yy; z = zz; }
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vec operator*(float f) const { return vec(x*f, y*f, z*f); }
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vec operator+(const vec &f2) const {
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return vec(x+f2.x, y+f2.y, z+f2.z);
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}
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vec operator-(const vec &f2) const {
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return vec(x-f2.x, y-f2.y, z-f2.z);
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}
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vec operator*(const vec &f2) const {
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return vec(x*f2.x, y*f2.y, z*f2.z);
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}
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float x, y, z;
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float pad;
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}
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#ifndef _MSC_VER
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__attribute__ ((aligned(16)))
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#endif
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;
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inline vec operator*(float f, const vec &v) { return vec(f*v.x, f*v.y, f*v.z); }
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#define NAO_SAMPLES 8
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#ifdef M_PI
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#undef M_PI
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#endif
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#define M_PI 3.1415926535f
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struct Isect {
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float t;
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vec p;
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vec n;
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int hit;
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};
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struct Sphere {
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vec center;
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float radius;
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};
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struct Plane {
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vec p;
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vec n;
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};
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struct Ray {
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vec org;
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vec dir;
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};
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static inline float dot(const vec &a, const vec &b) {
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return a.x * b.x + a.y * b.y + a.z * b.z;
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}
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static inline vec vcross(const vec &v0, const vec &v1) {
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vec ret;
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ret.x = v0.y * v1.z - v0.z * v1.y;
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ret.y = v0.z * v1.x - v0.x * v1.z;
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ret.z = v0.x * v1.y - v0.y * v1.x;
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return ret;
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}
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static inline void vnormalize(vec &v) {
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float len2 = dot(v, v);
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float invlen = 1.f / sqrtf(len2);
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v = v * invlen;
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}
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static inline void
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ray_plane_intersect(Isect &isect, Ray &ray,
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Plane &plane) {
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float d = -dot(plane.p, plane.n);
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float v = dot(ray.dir, plane.n);
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if (fabsf(v) < 1.0e-17f)
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return;
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else {
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float t = -(dot(ray.org, plane.n) + d) / v;
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if ((t > 0.0) && (t < isect.t)) {
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isect.t = t;
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isect.hit = 1;
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isect.p = ray.org + ray.dir * t;
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isect.n = plane.n;
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}
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}
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}
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static inline void
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ray_sphere_intersect(Isect &isect, Ray &ray,
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Sphere &sphere) {
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vec rs = ray.org - sphere.center;
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float B = dot(rs, ray.dir);
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float C = dot(rs, rs) - sphere.radius * sphere.radius;
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float D = B * B - C;
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if (D > 0.) {
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float t = -B - sqrtf(D);
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if ((t > 0.0) && (t < isect.t)) {
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isect.t = t;
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isect.hit = 1;
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isect.p = ray.org + t * ray.dir;
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isect.n = isect.p - sphere.center;
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vnormalize(isect.n);
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}
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}
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}
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static inline void
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orthoBasis(vec basis[3], const vec &n) {
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basis[2] = n;
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basis[1].x = 0.0; basis[1].y = 0.0; basis[1].z = 0.0;
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if ((n.x < 0.6f) && (n.x > -0.6f)) {
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basis[1].x = 1.0;
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} else if ((n.y < 0.6f) && (n.y > -0.6f)) {
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basis[1].y = 1.0;
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} else if ((n.z < 0.6f) && (n.z > -0.6f)) {
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basis[1].z = 1.0;
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} else {
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basis[1].x = 1.0;
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}
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basis[0] = vcross(basis[1], basis[2]);
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vnormalize(basis[0]);
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basis[1] = vcross(basis[2], basis[0]);
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vnormalize(basis[1]);
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}
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static float
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ambient_occlusion(Isect &isect, Plane &plane,
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Sphere spheres[3]) {
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float eps = 0.0001f;
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vec p, n;
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vec basis[3];
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float occlusion = 0.0;
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p = isect.p + eps * isect.n;
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orthoBasis(basis, isect.n);
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static const int ntheta = NAO_SAMPLES;
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static const int nphi = NAO_SAMPLES;
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for (int j = 0; j < ntheta; j++) {
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for (int i = 0; i < nphi; i++) {
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Ray ray;
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Isect occIsect;
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float theta = sqrtf(drand48());
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float phi = 2.0f * M_PI * drand48();
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float x = cosf(phi) * theta;
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float y = sinf(phi) * theta;
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float z = sqrtf(1.0f - theta * theta);
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// local . global
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float rx = x * basis[0].x + y * basis[1].x + z * basis[2].x;
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float ry = x * basis[0].y + y * basis[1].y + z * basis[2].y;
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float rz = x * basis[0].z + y * basis[1].z + z * basis[2].z;
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ray.org = p;
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ray.dir.x = rx;
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ray.dir.y = ry;
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ray.dir.z = rz;
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occIsect.t = 1.0e+17f;
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occIsect.hit = 0;
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for (int snum = 0; snum < 3; ++snum)
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ray_sphere_intersect(occIsect, ray, spheres[snum]);
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ray_plane_intersect (occIsect, ray, plane);
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if (occIsect.hit) occlusion += 1.f;
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}
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}
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occlusion = (ntheta * nphi - occlusion) / (float)(ntheta * nphi);
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return occlusion;
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}
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/* Compute the image for the scanlines from [y0,y1), for an overall image
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of width w and height h.
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*/
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static void ao_scanlines(int y0, int y1, int w, int h, int nsubsamples,
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float image[]) {
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static Plane plane = { vec(0.0f, -0.5f, 0.0f), vec(0.f, 1.f, 0.f) };
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static Sphere spheres[3] = {
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{ vec(-2.0f, 0.0f, -3.5f), 0.5f },
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{ vec(-0.5f, 0.0f, -3.0f), 0.5f },
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{ vec(1.0f, 0.0f, -2.2f), 0.5f } };
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srand48(y0);
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for (int y = y0; y < y1; ++y) {
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for (int x = 0; x < w; ++x) {
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int offset = 3 * (y * w + x);
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for (int u = 0; u < nsubsamples; ++u) {
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for (int v = 0; v < nsubsamples; ++v) {
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float px = (x + (u / (float)nsubsamples) - (w / 2.0f)) / (w / 2.0f);
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float py = -(y + (v / (float)nsubsamples) - (h / 2.0f)) / (h / 2.0f);
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float ret = 0.f;
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Ray ray;
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Isect isect;
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ray.org = vec(0.f, 0.f, 0.f);
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ray.dir.x = px;
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ray.dir.y = py;
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ray.dir.z = -1.0f;
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vnormalize(ray.dir);
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isect.t = 1.0e+17f;
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isect.hit = 0;
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for (int snum = 0; snum < 3; ++snum)
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ray_sphere_intersect(isect, ray, spheres[snum]);
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ray_plane_intersect(isect, ray, plane);
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if (isect.hit)
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ret = ambient_occlusion(isect, plane, spheres);
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// Update image for AO for this ray
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image[offset+0] += ret;
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image[offset+1] += ret;
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image[offset+2] += ret;
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}
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}
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// Normalize image pixels by number of samples taken per pixel
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image[offset+0] /= nsubsamples * nsubsamples;
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image[offset+1] /= nsubsamples * nsubsamples;
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image[offset+2] /= nsubsamples * nsubsamples;
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}
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}
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}
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void ao_serial(int w, int h, int nsubsamples,
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float image[]) {
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ao_scanlines(0, h, w, h, nsubsamples, image);
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}
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