/* task that renders a single screen tile */
Vec3fa renderPixelStandard(float x, float y, const ISPCCamera& camera, RayStats& stats)
{
/* initialize sampler */
RandomSampler sampler;
RandomSampler_init(sampler, (int)x, (int)y, 0);
/* initialize ray */
Ray ray(Vec3fa(camera.xfm.p), Vec3fa(normalize(x*camera.xfm.l.vx + y*camera.xfm.l.vy + camera.xfm.l.vz)), 0.0f, inf, RandomSampler_get1D(sampler));
/* intersect ray with scene */
RTCIntersectContext context;
rtcInitIntersectContext(&context);
context.flags = g_iflags_coherent;
rtcIntersect1(g_scene,&context,RTCRayHit_(ray));
RayStats_addRay(stats);
/* shade background black */
if (ray.geomID == RTC_INVALID_GEOMETRY_ID) {
return Vec3fa(0.0f);
}
/* shade all rays that hit something */
Vec3fa color = Vec3fa(0.5f);
/* compute differential geometry */
DifferentialGeometry dg;
dg.geomID = ray.geomID;
dg.primID = ray.primID;
dg.u = ray.u;
dg.v = ray.v;
dg.P = ray.org+ray.tfar*ray.dir;
dg.Ng = ray.Ng;
dg.Ns = ray.Ng;
if (g_use_smooth_normals)
if (ray.geomID != RTC_INVALID_GEOMETRY_ID) // FIXME: workaround for ISPC bug, location reached with empty execution mask
{
Vec3fa dPdu,dPdv;
unsigned int geomID = ray.geomID; {
rtcInterpolate1(rtcGetGeometry(g_scene,geomID),ray.primID,ray.u,ray.v,RTC_BUFFER_TYPE_VERTEX,0,nullptr,&dPdu.x,&dPdv.x,3);
}
dg.Ns = cross(dPdv,dPdu);
}
int materialID = postIntersect(ray,dg);
dg.Ng = face_forward(ray.dir,normalize(dg.Ng));
dg.Ns = face_forward(ray.dir,normalize(dg.Ns));
/* shade */
if (g_ispc_scene->materials[materialID]->type == MATERIAL_OBJ) {
ISPCOBJMaterial* material = (ISPCOBJMaterial*) g_ispc_scene->materials[materialID];
color = Vec3fa(material->Kd);
}
return color*dot(neg(ray.dir),dg.Ns);
}
task main()
{
face_forward();
return;
}
