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Updated Embree library to version 2.2

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schuellc
2015-01-28 16:07:34 +01:00
parent b930cfce27
commit 9b05283300
1941 changed files with 107083 additions and 242967 deletions
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external/embree/tutorials/tutorial06/tutorial06_device.cpp
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// ======================================================================== //
// Copyright 2009-2013 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. //
// ======================================================================== //
#include "../common/tutorial/tutorial_device.h"
struct ISPCTriangle
{
int v0; /*< first triangle vertex */
int v1; /*< second triangle vertex */
int v2; /*< third triangle vertex */
int materialID; /*< material of triangle */
};
struct ISPCMaterial
{
int illum; /*< illumination model */
float d; /*< dissolve factor, 1=opaque, 0=transparent */
float Ns; /*< specular exponent */
float Ni; /*< optical density for the surface (index of refraction) */
Vec3f Ka; /*< ambient reflectivity */
Vec3f Kd; /*< diffuse reflectivity */
Vec3f Ks; /*< specular reflectivity */
Vec3f Tf; /*< transmission filter */
};
struct ISPCMesh
{
Vec3fa* positions; //!< vertex position array
Vec3fa* normals; //!< vertex normal array
Vec2f* texcoords; //!< vertex texcoord array
ISPCTriangle* triangles; //!< list of triangles
int numVertices;
int numTriangles;
};
struct ISPCScene
{
ISPCMesh** meshes; //!< list of meshes
ISPCMaterial* materials; //!< material list
int numMeshes;
int numMaterials;
};
/* scene data */
extern "C" ISPCScene* g_ispc_scene;
RTCScene g_scene = NULL;
/* render function to use */
renderPixelFunc renderPixel;
/* light */
Vec3f AmbientLight__L;
/* called by the C++ code for initialization */
extern "C" void device_init (int8* cfg)
{
/* initialize ray tracing core */
rtcInit(cfg);
/* set start render mode */
renderPixel = renderPixelStandard;
/* set light */
AmbientLight__L = Vec3f(1,1,1);
}
RTCScene convertScene(ISPCScene* scene_in)
{
/* create scene */
RTCScene scene_out = rtcNewScene(RTC_SCENE_STATIC | RTC_SCENE_INCOHERENT,RTC_INTERSECT1);
/* add all meshes to the scene */
for (int i=0; i<scene_in->numMeshes; i++)
{
/* get ith mesh */
ISPCMesh* mesh = scene_in->meshes[i];
/* create a triangle mesh */
unsigned int geometry = rtcNewTriangleMesh (scene_out, RTC_GEOMETRY_STATIC, mesh->numTriangles, mesh->numVertices);
/* set vertices */
Vertex* vertices = (Vertex*) rtcMapBuffer(scene_out,geometry,RTC_VERTEX_BUFFER);
for (int j=0; j<mesh->numVertices; j++) {
vertices[j].x = mesh->positions[j].x;
vertices[j].y = mesh->positions[j].y;
vertices[j].z = mesh->positions[j].z;
}
/* set triangles */
Triangle* triangles = (Triangle*) rtcMapBuffer(scene_out,geometry,RTC_INDEX_BUFFER);
for (int j=0; j<mesh->numTriangles; j++) {
triangles[j].v0 = mesh->triangles[j].v0;
triangles[j].v1 = mesh->triangles[j].v1;
triangles[j].v2 = mesh->triangles[j].v2;
}
rtcUnmapBuffer(scene_out,geometry,RTC_VERTEX_BUFFER);
rtcUnmapBuffer(scene_out,geometry,RTC_INDEX_BUFFER);
}
/* commit changes to scene */
rtcCommit (scene_out);
return scene_out;
}
/*! Cosine weighted hemisphere sampling. Up direction is the z direction. */
inline Vec3f cosineSampleHemisphere(float& pdf, const float u, const float v)
{
const float phi = 2.0f * (float)pi * u;
const float cosTheta = sqrt(v), sinTheta = sqrt(1.0f - v);
pdf = cosTheta*(1.0f/(float)pi);
return Vec3f(cos(phi) * sinTheta, sin(phi) * sinTheta, cosTheta);
}
/*! Cosine weighted hemisphere sampling. Up direction is provided as argument. */
inline Vec3f cosineSampleHemisphere(float& pdf, const float& u, const float& v, const Vec3f& N) {
return mul(frame(N),cosineSampleHemisphere(pdf,u,v));
}
inline Vec3f AmbientLight__eval(const Vec3f& Ns, const Vec3f& wi) {
return AmbientLight__L;
}
inline Vec3f AmbientLight__sample(const Vec3f& Ns,
Vec3f& wi,
float& tMax,
const Vec2f& s)
{
float pdf; wi = cosineSampleHemisphere(pdf,s.x,s.y,Ns);
tMax = 1e20f;
return div(AmbientLight__L,pdf);
}
inline Vec3f Matte__eval(const int& materialID, const Vec3f& wo, const Vec3f& Ns, const Vec3f& wi)
{
ISPCMaterial* material = &g_ispc_scene->materials[materialID];
Vec3f diffuse = material->Kd;
return mul(diffuse, (1.0f/(float)pi) * clamp(dot(wi,Ns),0.0f,1.0f));
}
inline Vec3f Matte__sample(const int& materialID, const Vec3f& wo, const Vec3f& Ns, Vec3f& wi, const Vec2f& s)
{
float pdf; wi = cosineSampleHemisphere(pdf,s.x,s.y,Ns);
return div(Matte__eval(materialID, wo, Ns, wi),pdf);
}
inline float frand(int& seed) {
seed = 1103515245 * seed + 12345;
seed = 235543534 * seed + 2341233;
seed = 43565 * seed + 2332443;
return (seed & 0xFFFF)/(float)0xFFFF;
}
inline Vec3f face_forward(const Vec3fa& dir, const Vec3fa& Ng) {
return dot(dir,Ng) < 0.0f ? Ng : neg(Ng);
}
Vec3f renderPixelSeed(int x, int y, int& seed, const Vec3f& vx, const Vec3f& vy, const Vec3f& vz, const Vec3f& p)
{
/* radiance accumulator and weight */
Vec3f L = Vec3f(0.0f);
Vec3f Lw = Vec3f(1.0f);
/* initialize ray */
RTCRay ray;
ray.org = p;
ray.dir = normalize(add(mul(x,vx), mul(y,vy), vz));
ray.tnear = 0.0f;
ray.tfar = inf;
ray.geomID = RTC_INVALID_GEOMETRY_ID;
ray.primID = RTC_INVALID_GEOMETRY_ID;
ray.mask = -1;
ray.time = 0;
/* iterative path tracer loop */
for (int i=0; i<10; i++)
{
/* terminate if contribution too low */
if (max(Lw.x,max(Lw.y,Lw.z)) < 0.01f)
break;
/* intersect ray with scene */
rtcIntersect(g_scene,ray);
Vec3f Ns = face_forward(ray.dir,normalize(ray.Ng));
Vec3f Ph = add(ray.org,mul(ray.tfar,ray.dir));
/* shade background with ambient light */
if (ray.geomID == RTC_INVALID_GEOMETRY_ID) {
Vec3f La = AmbientLight__eval(Ns,neg(ray.dir));
L = add(L,mul(Lw,La));
break;
}
/* shade all rays that hit something */
#if 1 // FIXME: pointer gather not implemented on ISPC for Xeon Phi
int materialID = g_ispc_scene->meshes[ray.geomID]->triangles[ray.primID].materialID;
#else
int materialID = 0;
foreach_unique (geomID in ray.geomID) {
if (geomID >= 0 && geomID < g_ispc_scene->numMeshes) { // FIXME: workaround for ISPC bug
ISPCMesh* mesh = g_ispc_scene->meshes[geomID];
materialID = mesh->triangles[ray.primID].materialID;
}
}
#endif
/* sample ambient light */
Vec3f wi; float tMax;
Vec2f s = Vec2f(frand(seed),frand(seed));
Vec3f Ll = AmbientLight__sample(Ns,wi,tMax,s);
/* initialize shadow ray */
RTCRay shadow;
shadow.org = Ph;
shadow.dir = wi;
shadow.tnear = 0.001f;
shadow.tfar = inf;
shadow.geomID = RTC_INVALID_GEOMETRY_ID;
shadow.primID = RTC_INVALID_GEOMETRY_ID;
shadow.mask = -1;
shadow.time = 0;
/* trace shadow ray */
rtcOccluded(g_scene,shadow);
/* add light contribution */
if (shadow.geomID == RTC_INVALID_GEOMETRY_ID) {
Vec3f Lm = Matte__eval(materialID,neg(ray.dir),Ns,wi);
L = add(L,mul(Lw,mul(Ll,Lm)));
}
/* calculate diffuce bounce */
s = Vec2f(frand(seed),frand(seed));
Vec3f c = Matte__sample(materialID,neg(ray.dir), Ns, wi, s);
Lw = mul(Lw,c);
/* setup secondary ray */
ray.org = Ph;
ray.dir = normalize(wi);
ray.tnear = 0.001f;
ray.tfar = inf;
ray.geomID = RTC_INVALID_GEOMETRY_ID;
ray.primID = RTC_INVALID_GEOMETRY_ID;
ray.mask = -1;
ray.time = 0;
}
return L;
}
/* task that renders a single screen tile */
Vec3fa renderPixelStandard(int x, int y, const Vec3fa& vx, const Vec3fa& vy, const Vec3fa& vz, const Vec3fa& p)
{
int seed = x*233+y*234234+237;
Vec3f L = Vec3f(0.0f,0.0f,0.0f);
//for (int i=0; i<16; i++) {
L = add(L,renderPixelSeed(x,y,seed,vx,vy,vz,p));
//}
//L = mul(L,1.0f/16.0f);
return L;
}
/* task that renders a single screen tile */
void renderTile(int taskIndex, int* pixels,
const int width,
const int height,
const float time,
const Vec3f& vx,
const Vec3f& vy,
const Vec3f& vz,
const Vec3f& p,
const int numTilesX,
const int numTilesY)
{
const int tileY = taskIndex / numTilesX;
const int tileX = taskIndex - tileY * numTilesX;
const int x0 = tileX * TILE_SIZE_X;
const int x1 = min(x0+TILE_SIZE_X,width);
const int y0 = tileY * TILE_SIZE_Y;
const int y1 = min(y0+TILE_SIZE_Y,height);
for (int y = y0; y<y1; y++) for (int x = x0; x<x1; x++)
{
/* calculate pixel color */
//Vec3f color = Vec3f(0.0f,0.0f,0.0f);
Vec3f color = renderPixel(x,y,vx,vy,vz,p);
/* write color to framebuffer */
unsigned int r = (unsigned int) (255.0f * clamp(color.x,0.0f,1.0f));
unsigned int g = (unsigned int) (255.0f * clamp(color.y,0.0f,1.0f));
unsigned int b = (unsigned int) (255.0f * clamp(color.z,0.0f,1.0f));
pixels[y*width+x] = (b << 16) + (g << 8) + r;
}
}
/* called by the C++ code to render */
extern "C" void device_render (int* pixels,
const int width,
const int height,
const float time,
const Vec3f& vx,
const Vec3f& vy,
const Vec3f& vz,
const Vec3f& p)
{
/* create scene */
if (g_scene == NULL)
g_scene = convertScene(g_ispc_scene);
/* render image */
const int numTilesX = (width +TILE_SIZE_X-1)/TILE_SIZE_X;
const int numTilesY = (height+TILE_SIZE_Y-1)/TILE_SIZE_Y;
launch_renderTile(numTilesX*numTilesY,pixels,width,height,time,vx,vy,vz,p,numTilesX,numTilesY);
rtcDebug();
}
/* called by the C++ code for cleanup */
extern "C" void device_cleanup ()
{
rtcDeleteScene (g_scene);
rtcExit();
}