363 lines
8.7 KiB
Plaintext
363 lines
8.7 KiB
Plaintext
// -*- 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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#define NAO_SAMPLES 8
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//#define M_PI 3.1415926535f
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#define vec Float3
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struct Float3
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{
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float x,y,z;
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__device__ friend Float3 operator+(const Float3 a, const Float3 b)
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{
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Float3 c;
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c.x = a.x+b.x;
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c.y = a.y+b.y;
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c.z = a.z+b.z;
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return c;
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}
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__device__ friend Float3 operator-(const Float3 a, const Float3 b)
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{
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Float3 c;
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c.x = a.x-b.x;
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c.y = a.y-b.y;
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c.z = a.z-b.z;
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return c;
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}
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__device__ friend Float3 operator/(const Float3 a, const Float3 b)
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{
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Float3 c;
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c.x = a.x/b.x;
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c.y = a.y/b.y;
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c.z = a.z/b.z;
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return c;
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}
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__device__ friend Float3 operator/(const float a, const Float3 b)
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{
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Float3 c;
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c.x = a/b.x;
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c.y = a/b.y;
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c.z = a/b.z;
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return c;
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}
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__device__ friend Float3 operator*(const Float3 a, const Float3 b)
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{
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Float3 c;
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c.x = a.x*b.x;
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c.y = a.y*b.y;
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c.z = a.z*b.z;
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return c;
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}
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__device__ friend Float3 operator*(const Float3 a, const float b)
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{
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Float3 c;
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c.x = a.x*b;
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c.y = a.y*b;
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c.z = a.z*b;
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return c;
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}
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};
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#define programCount 32
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#define programIndex (threadIdx.x & 31)
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#define taskIndex0 (blockIdx.x*4 + (threadIdx.x >> 5))
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#define taskCount0 (gridDim.x*4)
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#define taskIndex1 (blockIdx.y)
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#define taskCount1 (gridDim.y)
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#define warpIdx (threadIdx.x >> 5)
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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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__device__
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static inline float dot(vec a, 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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__device__
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static inline vec vcross(vec v0, 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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__device__
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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 = rsqrt(len2);
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v = v*invlen;
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}
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__device__
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static inline void
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ray_plane_intersect(Isect &isect,const Ray &ray, const 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 (abs(v) < 1.0e-17)
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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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__device__
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static inline void
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ray_sphere_intersect(Isect &isect,const Ray &ray, const 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 - sqrt(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 + ray.dir * t;
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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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__device__
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static inline void
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orthoBasis(vec basis[3], 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 < 0.6) && (n.x > -0.6)) {
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basis[1].x = 1.0;
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} else if ((n.y < 0.6) && (n.y > -0.6)) {
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basis[1].y = 1.0;
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} else if ((n.z < 0.6) && (n.z > -0.6)) {
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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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__device__
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static inline float
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ambient_occlusion(Isect &isect, const Plane &plane, const Sphere spheres[3],
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RNGState &rngstate) {
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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 + isect.n * eps;
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orthoBasis(basis, isect.n);
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const int ntheta = NAO_SAMPLES;
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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 = sqrt(frandom(&rngstate));
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float phi = 2.0f * M_PI * frandom(&rngstate);
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float x = cos(phi) * theta;
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float y = sin(phi) * theta;
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float z = sqrt(1.0 - 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+17;
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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 += 1.0;
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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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__device__
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static inline void ao_tile(
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int x0, int x1,
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int y0, int y1,
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int w, int h,
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int nsubsamples,
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float image[])
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{
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const Plane plane = { { 0.0f, -0.5f, 0.0f }, { 0.f, 1.f, 0.f } };
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const Sphere spheres[3] = {
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{ { -2.0f, 0.0f, -3.5f }, 0.5f },
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{ { -0.5f, 0.0f, -3.0f }, 0.5f },
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{ { 1.0f, 0.0f, -2.2f }, 0.5f } };
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RNGState rngstate;
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seed_rng(&rngstate, programIndex + (y0 << (programIndex & 31)));
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float invSamples = 1.f / nsubsamples;
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for ( int y = y0; y < y1; y++)
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for ( int xb = x0; xb < x1; xb += programCount)
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{
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const int x = xb + programIndex;
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const int offset = 3 * (y * w + x);
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float res = 0.0f;
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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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{
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float du = (float)u * invSamples, dv = (float)v * invSamples;
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// Figure out x,y pixel in NDC
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float px = (x + du - (w / 2.0f)) / (w / 2.0f);
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float py = -(y + dv - (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.x = 0.0f;
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ray.org.y = 0.0f;
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ray.org.z = 0.0f;
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// Poor man's perspective projection
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ray.dir.x = px;
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ray.dir.y = py;
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ray.dir.z = -1.0;
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vnormalize(ray.dir);
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isect.t = 1.0e+17;
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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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// Note use of 'coherent' if statement; the set of rays we
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// trace will often all hit or all miss the scene
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if (isect.hit) {
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ret = ambient_occlusion(isect, plane, spheres, rngstate);
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ret *= invSamples * invSamples;
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res += ret;
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}
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}
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if (xb < x1)
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{
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image[offset ] = res;
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image[offset+1] = res;
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image[offset+2] = res;
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}
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}
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}
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#define TILEX 64
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#define TILEY 4
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extern "C"
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__global__
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void ao_task( int width, int height,
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int nsubsamples, float image[])
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{
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if (taskIndex0 >= taskCount0) return;
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if (taskIndex1 >= taskCount1) return;
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const int x0 = taskIndex0 * TILEX;
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const int x1 = min(x0 + TILEX, width);
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const int y0 = taskIndex1 * TILEY;
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const int y1 = min(y0 + TILEY, height);
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ao_tile(x0,x1,y0,y1, width, height, nsubsamples, image);
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}
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