77 lines
2.5 KiB
C++
77 lines
2.5 KiB
C++
// Copyright 2009-2021 Intel Corporation
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// SPDX-License-Identifier: Apache-2.0
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#include "light.h"
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#include <sampling.hpp>
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#include <math/linearspace3.h>
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#include "helper.hpp"
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namespace embree {
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struct AmbientLight {
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Light super; //!< inherited light fields
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Vec3fa radiance; //!< RGB color and intensity of light
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};
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// Implementation
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//////////////////////////////////////////////////////////////////////////////
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// XXX importance sampling is only done into the positive hemisphere
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// ==> poor support for translucent materials
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Light_SampleRes AmbientLight_sample(const Light* super,
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const Sample& dg,
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const Vec2f& s) {
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AmbientLight* self = (AmbientLight *) super;
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Light_SampleRes res;
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const Vec3fa localDir = cosineSampleHemisphere(s);
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res.dir = frame(dg.Ns) * localDir;
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res.pdf = cosineSampleHemispherePDF(localDir);
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res.dist = inf;
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res.weight = self->radiance * rcp(res.pdf);
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return res;
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}
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Light_EvalRes AmbientLight_eval(const Light* super,
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const Sample& dg,
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const Vec3fa& dir) {
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AmbientLight* self = (AmbientLight *) super;
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Light_EvalRes res;
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res.value = self->radiance;
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res.dist = inf;
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res.pdf = cosineSampleHemispherePDF(max(dot(dg.Ns, dir), 0.f));
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return res;
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}
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void AmbientLight_Constructor(AmbientLight* self,
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const Vec3fa& radiance) {
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Light_Constructor(&self->super);
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self->radiance = radiance;
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//self->super.sample = GET_FUNCTION_POINTER(AmbientLight_sample);
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//self->super.eval = GET_FUNCTION_POINTER(AmbientLight_eval);
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self->super.type = LIGHT_AMBIENT;
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}
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// Exports (called from C++)
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//////////////////////////////////////////////////////////////////////////////
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//! Create an ispc-side AmbientLight object
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extern "C" void* AmbientLight_create() {
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AmbientLight* self = (AmbientLight *) alignedUSMMalloc(sizeof(AmbientLight), 16);
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AmbientLight_Constructor(self, Vec3fa(1.f));
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return self;
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}
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//! Set the parameters of an ispc-side AmbientLight object
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extern "C" void AmbientLight_set(void* super,
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const Vec3fa& radiance) {
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AmbientLight* self = (AmbientLight *) super;
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self->radiance = radiance;
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}
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} // namespace embree
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