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// Copyright 2009-2020 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
#pragma once
#include "../core/differential_geometry.h"
namespace embree {
struct Light;
struct Light_SampleRes
{
Vec3fa weight; //!< radiance that arrives at the given point divided by pdf
Vec3fa dir; //!< direction towards the light source
float dist; //!< largest valid t_far value for a shadow ray
float pdf; //!< probability density that this sample was taken
};
//! compute the weighted radiance at a point caused by a sample on the light source
// by convention, giving (0, 0) as "random" numbers should sample the "center"
// of the light source (used by the raytracing renderers such as the OBJ renderer)
typedef Light_SampleRes (*Light_SampleFunc)(const Light* self,
const DifferentialGeometry& dg, /*! point to generate the sample for >*/
const Vec2f& s); /*! random numbers to generate the sample >*/
struct Light_EvalRes
{
Vec3fa value; //!< radiance that arrives at the given point (not weighted by pdf)
float dist;
float pdf; //!< probability density that the direction would have been sampled
};
//! compute the radiance, distance and pdf caused by the light source (pointed to by the given direction)
typedef Light_EvalRes (*Light_EvalFunc)(const Light* self,
const DifferentialGeometry& dg, /*! point to evaluate illumination for >*/
const Vec3fa& dir); /*! direction towards the light source >*/
struct Light
{
Light_SampleFunc sample;
Light_EvalFunc eval;
};
Light_EvalRes Light_eval(const Light* self, const DifferentialGeometry& dg, const Vec3fa& dir);
inline void Light_Constructor(Light* self)
{
self->eval = Light_eval;
}
} // namespace embree
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