text: // +----------------------------------------------------------------------
  // | Project : ray.
  // | All rights reserved.
  // +----------------------------------------------------------------------
  // | Copyright (c) 2013-2017.
  // +----------------------------------------------------------------------
  // | * Redistribution and use of this software in source and binary forms,
  // |   with or without modification, are permitted provided that the following
  // |   conditions are met:
  // |
  // | * Redistributions of source code must retain the above
  // |   copyright notice, this list of conditions and the
  // |   following disclaimer.
  // |
  // | * Redistributions in binary form must reproduce the above
  // |   copyright notice, this list of conditions and the
  // |   following disclaimer in the documentation and/or other
  // |   materials provided with the distribution.
  // |
  // | * Neither the name of the ray team, nor the names of its
  // |   contributors may be used to endorse or promote products
  // |   derived from this software without specific prior
  // |   written permission of the ray team.
  // |
  // | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  // | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  // | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  // | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  // | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  // | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  // | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  // | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  // | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  // | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  // +----------------------------------------------------------------------
  #ifndef _H_LIGHTMASS_GI_H_
  #define _H_LIGHTMASS_GI_H_
  
  #include "LightMassBaking.h"
  
  _NAME_BEGIN
  
  class LightBakingGI final : public LightMassBaking
  {
  public:
  	LightBakingGI() noexcept;
  	LightBakingGI(const LightBakingParams& params) noexcept;
  	~LightBakingGI() noexcept;
  
  	bool open(const LightBakingParams& params) noexcept;
  	void close() noexcept;
  
  private:
  	bool setupContext(const LightModelData& params) noexcept;
  
  	bool doSampleHemisphere(const Viewportt<int>& viewport, const float4x4& mvp);
  	void computeBoundingBox(const LightModelData& params, ray::BoundingBox& boundingBox, std::uint32_t firstFace, std::size_t faceCount) noexcept;
  
  private:
  	struct GLContext
  	{
  		GLContext() noexcept;
  		~GLContext() noexcept;
  
  		std::uint32_t vs;
  		std::uint32_t fs;
  		std::uint32_t program;
  
  		std::uint32_t mvp;
  		std::uint32_t lightsamp;
  		std::uint32_t emissive;
  
  		std::uint32_t lightmap;
  		std::uint32_t vao, vbo, ibo;
  	};
  
  	struct GLDrawElementsIndirectCommand
  	{
  		float3 emissive;
  		std::uint32_t count;
  		std::uint32_t instanceCount;
  		std::uint32_t firstIndex;
  		std::uint32_t baseVertex;
  		std::uint32_t baseInstance;
  		std::uint32_t faceType;
  	};
  
  	std::unique_ptr<GLContext> _glcontext;
  
  	std::vector<BoundingBox> _boundingBoxs;
  	std::vector<GLDrawElementsIndirectCommand> _drawcalls;
  
  	std::function<bool(float progress)> _progress;
  };
  
  _NAME_END
  
  #endif