File PostProcessing.h

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#pragma once

#include <optional>
#include <variant>
#include <unordered_map>

#include "Field.h"
#include "ID.h"

#include "Shaders.h"
#include "Texture.h"
#include "buffers/FrameBuffer.h"

#include "Sprite.h"

class PostProcessing : public ObjectID
{
public:
    Field pps_field{};
    Sprite pps_sprite{};
    ShaderType pps_type{};

public:
    PostProcessing(const std::string& _shader, ShaderType _type = FRAGMENT_SHADER);

private:

    FrameBuffer pps_fb;
    std::unordered_map<std::string, GLuint> pps_bindings;
    void UpdateBindings();

public:

    std::shared_ptr<Shaders> pps_shader;

    template<typename... T>
    void SetShaderValue(const std::string& _name, T ..._v);
    void SetShaderValue(const std::string& _name, GLsizei _count, const float* va0, ArrayType _TYPE);
    void AddBinding(std::string _pass_name, GLuint _slot);

    void* GetShader()       override { return pps_shader.get(); };
    void* GetTransform()    override { return dynamic_cast<Transform*>( pps_field.GetTransformPtr()); }

public:
    void RenderPPS(const glm::vec2& _scr_size = glm::vec2(0), GLuint _batch = 16);
    void RenderPPSSpr(const Context& ctx);
};

template<typename... T>
void PostProcessing::SetShaderValue(const std::string& _name, T ..._v)
{
    pps_shader->UseShader();
    pps_shader->SetValue(_name, _v...);
}