59 lines
1.3 KiB
C++
59 lines
1.3 KiB
C++
// Copyright (c) 2012-2023 Wojciech Figat. All rights reserved.
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#pragma once
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#if COMPILE_WITH_ASSETS_IMPORTER
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#include "Engine/Core/Types/BaseTypes.h"
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#include "Engine/Core/Collections/Array.h"
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/// <summary>
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/// Utility for loading IES files and extract light emission information.
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/// </summary>
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class ImportIES
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{
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private:
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float _brightness = 0;
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Array<float> _hAngles;
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Array<float> _vAngles;
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Array<float> _candalaValues;
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public:
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/// <summary>
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/// Loads the IES file.
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/// </summary>
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/// <param name="buffer">The buffer with data.</param>
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/// <returns>True if cannot load, otherwise false.</returns>
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bool Load(const byte* buffer);
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/// <summary>
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/// Extracts IES profile data to R16 format (float).
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/// </summary>
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/// <param name="output">The result data container.</param>
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/// <returns>The multiplier as the texture is normalized.</returns>
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float ExtractInR16(Array<byte>& output);
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public:
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uint32 GetWidth() const
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{
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return 256;
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}
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uint32 GetHeight() const
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{
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return 1;
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}
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float GetBrightness() const
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{
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return _brightness;
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}
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private:
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float InterpolatePoint(int32 x, int32 y) const;
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float InterpolateBilinear(float x, float y) const;
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static float ComputeFilterPos(float value, const Array<float>& sortedValues);
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};
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#endif
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