Batch.h

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#pragma once
 
#include "Shader.h"
#include "Texture.h"
#include "GameObject.h"
 
#include <unordered_map>
#include <vector>
 
#define UNIFORM_VIEWxPROJ_STR       "uVP"
#define UNIFORM_TEXTURE_ARRAY_STR   "uTex"
 
class Batch {
private:
    uint32 VAO;
    uint32 VBO;
    uint32 EBO;
    bool _shouldDraw   = 1; //Used for static batch only
    int currentTexSlot = 0;
    int offset         = 0;
 
public:
    std::string shader    = "";
    int         layer     = 0;
    bool        isDynamic = 1;
 
    std::unordered_map<GameObject*, int> objs;       //The value is the offset in stride unit
    std::vector<float>                   vertices;
    std::unordered_map<Texture*, int>    textures;   //value  is a texure slot
 
    Batch();
 
    bool Render(GameObject* go, float* stride);
 
    void BindTextures();
 
    void Draw();
 
    void Delete();
 
    static const uint32 strideSize;
    static const uint32 strideSizeByte;
    static uint32* indices;
    static int indicesSize;
    static uint32 batchMaxQuads;
    static uint16 maxBatchTextures;
 
    static std::unordered_map<int, std::vector<Batch*>> batchMap; //Batches are allocated dynamically and it's pointer is owned by this map which should be deleted with scene
 
    static void ComputeIndices();
 
    static int DefaultBatchDrawCallback(void* data);
};