BlockGame/blocks/RenderBase.h

//
// Created by lukas on 05.02.22.
//

#ifndef OPENGLTEST_RENDERBASE_H
#define OPENGLTEST_RENDERBASE_H


#include <iostream>
#include "../gl/Renderer.h"
#include "../gl/Shader.h"

template<class T>
class RenderBase {
private:
    static RenderBase *instance;
protected:
    RenderBase() {
        if (instance) throw std::logic_error("Instance already exists");
        instance = this;
    }

public:
    virtual VertexArray *setVertexArray() = 0;

    virtual Shader setShader() = 0;

    virtual IndexBuffer *setIndexBuffer() = 0;

    static RenderBase *getInstance() {
        if (instance == nullptr) {
            new T();
            instance->init();
        }
        return instance;
    }

public:
    Renderer r;
    VertexArray *va;
    IndexBuffer *ib;
    Shader s;

public:


    virtual void render() {
        r.render(*va, *ib, s);
    }

    void init() {
        s = setShader();
        va = setVertexArray();
        ib = setIndexBuffer();
    }

    void deinit() {
        glDeleteProgram(s.getHandle());
    }

    unsigned getMVPhandle() {
        return s.getUniformHandle("MVP");
    }

    unsigned getUniformhandle(std::string name) {
        return s.getUniformHandle(std::move(name));
    }
};

template<class T>
RenderBase<T> *RenderBase<T>::instance = nullptr;

#endif //OPENGLTEST_RENDERBASE_H