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/*
* Adapted from Open Shading Language with this license:
*
* Copyright (c) 2009-2010 Sony Pictures Imageworks Inc., et al.
* All Rights Reserved.
*
* Modifications Copyright 2011, Blender Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Sony Pictures Imageworks nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <OpenImageIO/fmath.h>
#include <OSL/genclosure.h>
#include "osl_closures.h"
#include "kernel_types.h"
#include "closure/emissive.h"
CCL_NAMESPACE_BEGIN
using namespace OSL;
/// Variable cone emissive closure
///
/// This primitive emits in a cone having a configurable
/// penumbra area where the light decays to 0 reaching the
/// outer_angle limit. It can also behave as a lambertian emitter
/// if the provided angles are PI/2, which is the default
///
class GenericEmissiveClosure : public CClosurePrimitive {
public:
GenericEmissiveClosure() : CClosurePrimitive(Emissive) { }
Color3 eval(const Vec3 &Ng, const Vec3 &omega_out) const
{
float3 result = emissive_simple_eval(TO_FLOAT3(Ng), TO_FLOAT3(omega_out));
return TO_COLOR3(result);
}
void sample(const Vec3 &Ng, float randu, float randv,
Vec3 &omega_out, float &pdf) const
{
float3 omega_out_;
emissive_sample(TO_FLOAT3(Ng), randu, randv, &omega_out_, &pdf);
omega_out = TO_VEC3(omega_out_);
}
float pdf(const Vec3 &Ng, const Vec3 &omega_out) const
{
return emissive_pdf(TO_FLOAT3(Ng), TO_FLOAT3(omega_out));
}
};
ClosureParam *closure_emission_params()
{
static ClosureParam params[] = {
CLOSURE_STRING_KEYPARAM("label"),
CLOSURE_FINISH_PARAM(GenericEmissiveClosure)
};
return params;
}
CCLOSURE_PREPARE(closure_emission_prepare, GenericEmissiveClosure)
CCL_NAMESPACE_END
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