SpriteBatch.h

#ifndef MLSPRITEBATCH_H
#define MLSPRITEBATCH_H
#include "MLSprite.h"
#include "MLShader.h"
#include "general.h"
#include <map>

using MLRenderer::MLSprite;
using MLRenderer::MLShader;
using namespace MLMath::MLVector2;
using namespace MLMath::MLVector3;

//
#define ML_MAX_SPRITES 2000

namespace MLRenderer
{
    namespace MLBatchItem
    {
        //batch item
        typedef struct batchInfo
        {
            Vector3f VPos[ML_MAX_SPRITES * 4];
            Vector2f UV[ML_MAX_SPRITES * 4];

            batchInfo() : pointcount(0), spriteCount(0){}

            void addPoint(Vector3f Vpos, Vector2f uv)
            {
                VPos[pointcount] = Vpos;
                UV[pointcount] = uv;
                pointcount++;
            }
            int spriteCount;
            int pointcount;
        }batchInfo;
    }

    class MLSpriteBatch
    {
    public:
        MLSpriteBatch(void);
        //constructor for custom shader
        MLSpriteBatch(MLShader* inShader);
        virtual ~MLSpriteBatch(void);

        //begin function to be called first
        void Begin(/*Settings*/bool Alpha = true);

        //draw a sprite object
        void Draw(MLSprite* Sprite);
        //custom draw function
        void Draw(GLuint Texture, Vector2f Pos, Vector2f Size);
        //end batch and render everything
        void End();

        //set a custom shader
        void setShader(MLShader* inShader);

        //release the pointers and the shader
        void release();
        void releaseShader();
    private:
        //render the batch
        void Render();
        //initlaise the batch
        void Initalise();

    private:
        bool m_beginCall;

        //buffer objects
        GLuint m_VposBuffer;
        GLuint m_UVBuffer;
        GLuint m_BatchVAO;

        GLint* indicies;
        GLsizei* Vcount;

        int totalSpriteCount;

        MLShader* m_shader;

        //stores all the batch items
        typedef std::map<GLuint, MLBatchItem::batchInfo*> BatchMap;
        BatchMap m_BatchItems;
    };
}


#endif //MLSPRITEBATCH_H