//
// Copyright 2017-2023 Valve Corporation.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

#pragma once

#include "coordinate_space.h"

namespace ipl {

// --------------------------------------------------------------------------------------------------------------------
// Directivity
// --------------------------------------------------------------------------------------------------------------------

typedef float (IPL_CALLBACK *DirectivityCallback)(const Vector3f& direction,
                                                  void* userData);

class Directivity
{
public:
    float dipoleWeight;
    float dipolePower;
    DirectivityCallback callback;
    void* userData;

    Directivity();

    Directivity(float dipoleWeight,
                float dipolePower,
                DirectivityCallback callback = nullptr,
                void* userData = nullptr);

    float evaluateAt(const Vector3f& point,
                     const CoordinateSpace3f& coordinates) const;

private:
    float evaluate(const Vector3f& direction) const;
};

}