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// Copyright 2009 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
// ospray
#include "GeometricModel.ih"
#include "math/Distribution1D.ih"
#include "render/Material.ih"
#include "render/MaterialDispatch.ih"
// c++ shared
#include "common/InstanceShared.h"
OSPRAY_BEGIN_ISPC_NAMESPACE
export uniform int GeometricModel_gatherEmissivePrimIDs(void *uniform _model,
void *uniform _renderer,
void *uniform _instance,
int *uniform primIDs,
float *uniform distribution,
uniform float &pdf)
{
GeometricModel *uniform model = (GeometricModel * uniform) _model;
const Renderer *uniform renderer = (Renderer * uniform) _renderer;
const Geometry *uniform geo = model->geom;
const Instance *uniform instance = (Instance * uniform) _instance;
// create the list of emissive primitive IDs
uniform int32 numEmissivePrims = 0;
#ifdef OSPRAY_TARGET_SYCL
// SYCL execution in a thread is scalar
for (int primID = 0; primID < geo->numPrimitives; ++primID) {
#else
foreach (primID = 0 ... geo->numPrimitives) {
#endif
Material *mat =
(Material *)GeometricModel_getMaterial(model, renderer, primID);
if (mat->isEmissive) {
int offset = exclusive_scan_add(1);
primIDs[numEmissivePrims + offset] = primID;
numEmissivePrims += reduce_add(1);
}
}
// create the sampling distribution
// TODO: use emissive power instead of just area
// TODO: motion blur can introduce scale, which means areas cannot
// accurately be precomputed
// Note: Can stay as a ptr call if not moved to GPU
geo->getAreas(geo, primIDs, numEmissivePrims, instance->xfm, distribution);
pdf = model->areaPDF =
1.f / Distribution1D_create(numEmissivePrims, distribution);
return numEmissivePrims;
}
OSPRAY_END_ISPC_NAMESPACE
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