244 lines
7.7 KiB
C++
Executable File
244 lines
7.7 KiB
C++
Executable File
// ======================================================================== //
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// Copyright 2009-2014 Intel Corporation //
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// //
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// Licensed under the Apache License, Version 2.0 (the "License"); //
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// you may not use this file except in compliance with the License. //
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// You may obtain a copy of the License at //
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// //
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// http://www.apache.org/licenses/LICENSE-2.0 //
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// //
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// Unless required by applicable law or agreed to in writing, software //
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// distributed under the License is distributed on an "AS IS" BASIS, //
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. //
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// See the License for the specific language governing permissions and //
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// limitations under the License. //
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// ======================================================================== //
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#include "../common/tutorial/tutorial_device.h"
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#include "../common/tutorial/scene_device.h"
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/* scene data */
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extern "C" ISPCScene* g_ispc_scene;
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RTCScene g_scene = NULL;
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/* render function to use */
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renderPixelFunc renderPixel;
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/* error reporting function */
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void error_handler(const RTCError code, const int8* str)
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{
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printf("Embree: ");
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switch (code) {
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case RTC_UNKNOWN_ERROR : printf("RTC_UNKNOWN_ERROR"); break;
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case RTC_INVALID_ARGUMENT : printf("RTC_INVALID_ARGUMENT"); break;
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case RTC_INVALID_OPERATION: printf("RTC_INVALID_OPERATION"); break;
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case RTC_OUT_OF_MEMORY : printf("RTC_OUT_OF_MEMORY"); break;
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case RTC_UNSUPPORTED_CPU : printf("RTC_UNSUPPORTED_CPU"); break;
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default : printf("invalid error code"); break;
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}
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if (str) {
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printf(" (");
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while (*str) putchar(*str++);
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printf(")\n");
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}
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abort();
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}
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Vec3fa renderPixelEyeLight(float x, float y, const Vec3fa& vx, const Vec3fa& vy, const Vec3fa& vz, const Vec3fa& p);
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/* called by the C++ code for initialization */
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extern "C" void device_init (int8* cfg)
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{
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/* initialize ray tracing core */
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rtcInit(cfg);
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/* set error handler */
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rtcSetErrorFunction(error_handler);
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/* set start render mode */
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renderPixel = renderPixelStandard;
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//renderPixel = renderPixelEyeLight;
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}
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RTCScene convertScene(ISPCScene* scene_in)
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{
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/* create scene */
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RTCScene scene_out = rtcNewScene(RTC_SCENE_STATIC,RTC_INTERSECT1);
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/* add all meshes to the scene */
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for (int i=0; i<scene_in->numMeshes; i++)
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{
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/* get ith mesh */
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ISPCMesh* mesh = scene_in->meshes[i];
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/* create a triangle mesh */
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unsigned int geometry = rtcNewTriangleMesh (scene_out, RTC_GEOMETRY_STATIC, mesh->numTriangles, mesh->numVertices);
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/* share vertex buffer */
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rtcSetBuffer(scene_out, geometry, RTC_VERTEX_BUFFER, mesh->positions, 0, sizeof(Vec3fa ));
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rtcSetBuffer(scene_out, geometry, RTC_INDEX_BUFFER, mesh->triangles, 0, sizeof(ISPCTriangle));
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}
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/* commit changes to scene */
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return scene_out;
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}
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/* task that renders a single screen tile */
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Vec3fa renderPixelStandard(float x, float y, const Vec3fa& vx, const Vec3fa& vy, const Vec3fa& vz, const Vec3fa& p)
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{
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/* initialize ray */
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RTCRay ray;
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ray.org = p;
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ray.dir = normalize(x*vx + y*vy + vz);
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ray.tnear = 0.0f;
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ray.tfar = inf;
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ray.geomID = RTC_INVALID_GEOMETRY_ID;
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ray.primID = RTC_INVALID_GEOMETRY_ID;
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ray.mask = -1;
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ray.time = 0;
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/* intersect ray with scene */
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rtcIntersect(g_scene,ray);
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/* shade background black */
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if (ray.geomID == RTC_INVALID_GEOMETRY_ID) return Vec3fa(0.0f);
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/* shade all rays that hit something */
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Vec3fa color = Vec3fa(0.0f);
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Vec3fa Ns = Vec3fa(0.0f);
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#if 1 // FIXME: pointer gather not implemented on ISPC for Xeon Phi
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ISPCMesh* mesh = g_ispc_scene->meshes[ray.geomID];
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ISPCTriangle* tri = &mesh->triangles[ray.primID];
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/* load material ID */
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int materialID = tri->materialID;
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/* interpolate shading normal */
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if (mesh->normals) {
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Vec3fa n0 = Vec3fa(mesh->normals[tri->v0]);
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Vec3fa n1 = Vec3fa(mesh->normals[tri->v1]);
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Vec3fa n2 = Vec3fa(mesh->normals[tri->v2]);
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float u = ray.u, v = ray.v, w = 1.0f-ray.u-ray.v;
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Ns = normalize(w*n0 + u*n1 + v*n2);
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} else {
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Ns = normalize(ray.Ng);
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}
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#else
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int materialID = 0;
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foreach_unique (geomID in ray.geomID)
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{
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ISPCMesh* mesh = g_ispc_scene->meshes[geomID];
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foreach_unique (primID in ray.primID)
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{
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ISPCTriangle* tri = &mesh->triangles[primID];
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/* load material ID */
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materialID = tri->materialID;
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/* interpolate shading normal */
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if (mesh->normals) {
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Vec3fa n0 = Vec3fa(mesh->normals[tri->v0]);
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Vec3fa n1 = Vec3fa(mesh->normals[tri->v1]);
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Vec3fa n2 = Vec3fa(mesh->normals[tri->v2]);
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float u = ray.u, v = ray.v, w = 1.0f-ray.u-ray.v;
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Ns = w*n0 + u*n1 + v*n2;
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} else {
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Ns = normalize(ray.Ng);
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}
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}
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}
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Ns = normalize(Ns);
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#endif
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OBJMaterial* material = (OBJMaterial*) &g_ispc_scene->materials[materialID];
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color = Vec3fa(material->Kd);
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/* apply ambient light */
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Vec3fa Nf = faceforward(Ns,neg(ray.dir),Ns);
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//Vec3fa Ng = normalize(ray.Ng);
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//Vec3fa Nf = dot(ray.dir,Ng) < 0.0f ? Ng : neg(Ng);
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color = color*dot(ray.dir,Nf); // FIXME: *=
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return color;
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}
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/* task that renders a single screen tile */
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void renderTile(int taskIndex, int* pixels,
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const int width,
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const int height,
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const float time,
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const Vec3fa& vx,
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const Vec3fa& vy,
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const Vec3fa& vz,
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const Vec3fa& p,
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const int numTilesX,
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const int numTilesY)
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{
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const int tileY = taskIndex / numTilesX;
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const int tileX = taskIndex - tileY * numTilesX;
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const int x0 = tileX * TILE_SIZE_X;
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const int x1 = min(x0+TILE_SIZE_X,width);
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const int y0 = tileY * TILE_SIZE_Y;
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const int y1 = min(y0+TILE_SIZE_Y,height);
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for (int y = y0; y<y1; y++) for (int x = x0; x<x1; x++)
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{
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/* calculate pixel color */
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Vec3fa color = renderPixel(x,y,vx,vy,vz,p);
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/* write color to framebuffer */
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unsigned int r = (unsigned int) (255.0f * clamp(color.x,0.0f,1.0f));
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unsigned int g = (unsigned int) (255.0f * clamp(color.y,0.0f,1.0f));
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unsigned int b = (unsigned int) (255.0f * clamp(color.z,0.0f,1.0f));
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pixels[y*width+x] = (b << 16) + (g << 8) + r;
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}
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}
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/* rtcCommitThread called by all ISPC worker threads to enable parallel build */
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#if defined(PARALLEL_COMMIT)
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task void parallelCommit(RTCScene scene) {
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rtcCommitThread (scene,threadIndex,threadCount);
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}
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#endif
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/* called by the C++ code to render */
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extern "C" void device_render (int* pixels,
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const int width,
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const int height,
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const float time,
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const Vec3fa& vx,
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const Vec3fa& vy,
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const Vec3fa& vz,
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const Vec3fa& p)
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{
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/* create scene */
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if (g_scene == NULL)
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{
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g_scene = convertScene(g_ispc_scene);
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#if !defined(PARALLEL_COMMIT)
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rtcCommit (g_scene);
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#else
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launch[ getNumHWThreads() ] parallelCommit(g_scene);
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#endif
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}
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/* render image */
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const int numTilesX = (width +TILE_SIZE_X-1)/TILE_SIZE_X;
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const int numTilesY = (height+TILE_SIZE_Y-1)/TILE_SIZE_Y;
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launch_renderTile(numTilesX*numTilesY,pixels,width,height,time,vx,vy,vz,p,numTilesX,numTilesY);
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rtcDebug();
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}
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/* called by the C++ code for cleanup */
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extern "C" void device_cleanup ()
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{
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rtcDeleteScene (g_scene);
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rtcExit();
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}
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