RenderTarget.h

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#pragma once
#include <glad/glad.h>
#include <Color4.hpp>
#include <Colors.hpp>
#include <JGL/types/Enums.h>
#include <J3ML/LinearAlgebra/Vector2.hpp>
 
namespace JGL {
    class RenderTarget;
    class Texture; // Forward declare.
}
 
class JGL::RenderTarget {
private:
    Color4 clear_color{0,0,0,0};
    Vector2 size{0, 0};
    bool using_depth = false;
    bool texture_created_by_us = false;
    GLuint framebuffer_object = 0;
    GLuint depth_buffer = 0;
    const Texture* texture = nullptr;
    MSAA_SAMPLE_RATE msaa_sample_rate = MSAA_SAMPLE_RATE::MSAA_NONE;
    GLuint msaa_framebuffer_object = 0;
    GLuint msaa_depth_buffer = 0;
    GLuint msaa_render_buffer = 0;
    void Erase();
public:
    static GLuint GetActiveGLFramebufferHandle();
    static void SetActiveGLRenderTarget(const RenderTarget& render_target);
 
    void Resize(const Vector2& new_size);
    void SetMSAAEnabled(MSAA_SAMPLE_RATE sample_rate);
    void Blit() const;
 
    static void Blit(const RenderTarget& source, RenderTarget* destination);
    [[nodiscard]] bool TextureCreatedByRenderTarget() const;
public:
    [[nodiscard]] Vector2 GetDimensions() const;
    [[nodiscard]] MSAA_SAMPLE_RATE GetMSAASampleRate() const;
    [[nodiscard]] bool MSAAEnabled() const;
    [[nodiscard]] const Texture* GetJGLTexture() const;
    [[nodiscard]] GLuint GetGLTextureHandle() const;
    [[nodiscard]] GLuint GetGLFramebufferObjectHandle() const;
    [[nodiscard]] GLuint GetGLDepthBufferHandle() const;
    [[nodiscard]] Color4 GetClearColor() const;
    [[nodiscard]] std::vector<GLfloat> GetData() const;
public:
    RenderTarget(const RenderTarget& rhs);
    explicit RenderTarget(const Texture* texture, const Color4& clear_color = Colors::Black);
    explicit RenderTarget(const Vector2& size, const Color4& clear_color = Colors::Black, bool use_depth = false, MSAA_SAMPLE_RATE sample_rate = MSAA_SAMPLE_RATE::MSAA_NONE);
    ~RenderTarget();
};