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// Copyright 2022 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
#pragma once
#include "LightShared.h"
#ifdef __cplusplus
namespace ispc {
#endif // __cplusplus
// for very small cones treat as singular light, because float precision is not
// good enough
#define COS_ANGLE_MAX 0.99999988f
struct DirectionalLight
{
Light super; // inherited light fields
linear3f frame; // coordinate frame, with vz == direction *towards* the
// light source
vec3f irradiance; // RGB irradiance contribution of the light
float cosAngle; // Angular limit of the cone light in an easier to use form:
// cosine of the half angle in radians
float pdf; // Probability to sample a direction to the light
#ifdef __cplusplus
DirectionalLight() : frame(one), irradiance(0.f), cosAngle(1.f), pdf(inf)
{
super.type = LIGHT_TYPE_DIRECTIONAL;
}
void set(bool isVisible,
const Instance *instance,
const vec3f &direction,
const vec3f &irradiance,
float cosAngle);
};
} // namespace ispc
#else
};
#endif // __cplusplus
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