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// Copyright 2022 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
#pragma once
#include "common/FeatureFlags.ih"
#include "common/OSPCommon.ih"
#include "rkcommon/math/vec.ih"
// c++ shared
#include "LightShared.h"
OSPRAY_BEGIN_ISPC_NAMESPACE
struct Light;
struct DifferentialGeometry;
// 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 SciVis
// renderer)
SYCL_EXTERNAL __noinline Light_SampleRes Light_dispatch_sample(
const Light *uniform self,
const DifferentialGeometry &dg, // point (&normal) to generate the sample
const vec2f &s, // random numbers to generate the sample
const float time, // generate the sample at time (motion blur)
const uniform FeatureFlagsHandler &ffh);
//! compute the radiance and pdf caused by the light source (pointed to by the
//! given direction up until maxDist)
SYCL_EXTERNAL __noinline Light_EvalRes Light_dispatch_eval(
const Light *uniform self,
const DifferentialGeometry &dg, // point to evaluate illumination for
const vec3f &dir, // direction towards the light source, normalized
const float minDist, // minimum distance to look for light contribution
const float maxDist, // maximum distance to look for light contribution
const float time, // evaluate at time (motion blur)
const uniform FeatureFlagsHandler &ffh);
OSPRAY_END_ISPC_NAMESPACE
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