/******************************************************************************
 * Spine Runtimes License Agreement
 * Last updated January 1, 2020. Replaces all prior versions.
 *
 * Copyright (c) 2013-2020, Esoteric Software LLC
 *
 * Integration of the Spine Runtimes into software or otherwise creating
 * derivative works of the Spine Runtimes is permitted under the terms and
 * conditions of Section 2 of the Spine Editor License Agreement:
 * http://esotericsoftware.com/spine-editor-license
 *
 * Otherwise, it is permitted to integrate the Spine Runtimes into software
 * or otherwise create derivative works of the Spine Runtimes (collectively,
 * "Products"), provided that each user of the Products must obtain their own
 * Spine Editor license and redistribution of the Products in any form must
 * include this license and copyright notice.
 *
 * THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "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 ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
 * BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 *****************************************************************************/

#ifndef SPINE_SKELETONBATCH_H_
#define SPINE_SKELETONBATCH_H_

#include "cocos2d.h"
#if COCOS2D_VERSION >= 0x00040000

#include <spine/spine.h>
#include <vector>

namespace spine {

    class CustomTrianglesCommand : public cocos2d::TrianglesCommand
    {
    public:
        cocos2d::backend::UniformLocation                   _locMVP;
        cocos2d::backend::UniformLocation                   _locTexture;
    };

    class SkeletonBatch {
    public:
        static SkeletonBatch* getInstance ();
        
        static void destroyInstance ();
        
        void update (float delta);
		
		cocos2d::V3F_C4B_T2F* allocateVertices(uint32_t numVertices);
		void deallocateVertices(uint32_t numVertices);
		unsigned short* allocateIndices(uint32_t numIndices);
		void deallocateIndices(uint32_t numVertices);
		CustomTrianglesCommand* addCommand(cocos2d::Renderer* renderer, float globalOrder, cocos2d::Texture2D* texture, const cocos2d::backend::ProgramState* programState, cocos2d::BlendFunc blendType, const cocos2d::TrianglesCommand::Triangles& triangles, const cocos2d::Mat4& mv, uint32_t flags);
        
    protected:
        SkeletonBatch ();
        virtual ~SkeletonBatch ();
		
		void reset ();
		
		CustomTrianglesCommand* nextFreeCommand ();

        CustomTrianglesCommand* createNewTrianglesCommand();
        std::shared_ptr<cocos2d::backend::ProgramState>     _programState = nullptr;
        cocos2d::backend::UniformLocation                   _locMVP;
        cocos2d::backend::UniformLocation                   _locTexture;
		
		// pool of commands
		std::vector<CustomTrianglesCommand*>             _commandsPool;
		uint32_t                                            _nextFreeCommand;
		
		// pool of vertices
		std::vector<cocos2d::V3F_C4B_T2F>                   _vertices;
		uint32_t                                            _numVertices;
		
		// pool of indices
		Vector<unsigned short>                              _indices;
    };
	
}

#endif

#endif // SPINE_SKELETONBATCH_H_