framebuffer.h

#ifndef OE_RENDER_FRAMEBUFFER_H
#define OE_RENDER_FRAMEBUFFER_H
 
#include <map>
#include <glm/vec2.hpp>
#include <glm/vec4.hpp>
#include <memory>
#include "texture.h"
 
namespace oe::render
{
    enum TargetBuffer : int
    {
        COLOR_BUFFER = 0x4000,
        DEPTH_BUFFER = 0x0100,
        STENCIL_BUFFER = 0x0400,
 
        ALL = 0x4500,
    };
 
    class Framebuffer
    {
        public:
            Framebuffer(const glm::ivec2& dimensions);
 
            Framebuffer(const uint32_t width, const uint32_t height);
            ~Framebuffer();
 
            std::shared_ptr<Texture> addColorAttachment(const uint32_t attachment_level = 0, const uint32_t internal_format = 0, const uint32_t format = 0, const uint32_t type = 0,
                const uint32_t filter = 0, const uint8_t max_mips = 1
            );
 
            void addDepthAttachment(const uint32_t format = 0, const uint32_t type = 0, const uint32_t filter = 0);
 
            void setDepthAttachment(std::shared_ptr<Texture> texture);
 
            void setTextureAttachment(const uint32_t attachment_level, std::shared_ptr<Texture> texture, const int32_t mip_level = 0);
 
            void clearContents(const glm::vec4& color = glm::vec4(0.f), const int& target = 0);
 
            void beginRender(const bool resize_viewport = true);
 
            void endRender();
 
            operator bool();
 
            inline const std::shared_ptr<Texture>& getColorAttachment(const uint32_t attachment_level) const
            {
                return _color_attachments.at(attachment_level);
            }
 
            inline const std::shared_ptr<Texture>& getDepthAttachment() const
            {
                return _depth_attachment;
            }
 
            void blitFrom(
                const Framebuffer* src,
                const glm::ivec4& src_bounds = glm::ivec4(0),
                const glm::ivec4& target_bounds = glm::ivec4(0),
                const TargetBuffer& type = TargetBuffer::ALL,
                const uint8_t color_attachment_src = 0,
                const uint8_t color_attachment_dest = 0,
                const bool usefilter = false
            );
 
            void blitTo(
                Framebuffer* target,
                const glm::ivec4& src_bounds = glm::ivec4(0),
                const glm::ivec4& target_bounds = glm::ivec4(0),
                const TargetBuffer& type = TargetBuffer::ALL,
                const uint8_t color_attachment_src = 0,
                const uint8_t color_attachment_dest = 0,
                const bool usefilter = false
            ) const;
 
            void copyFrom(Framebuffer* source, const TargetBuffer& type = TargetBuffer::ALL)
            {
                blitFrom(source, {}, {}, type);
            }
 
            void blitToDefault(const uint8_t color_attachment_src = 0, const bool& usefilter = false) const;
 
            /*
             * Blit textures using quad rendering
             * faster than a classic blit
             */
             //void blitTexture(render::Texture* target, const glm::ivec4& src_bounds, const glm::ivec4& target_bounds, const TargetBuffer& type, const bool& usefilter = false);
 
             inline glm::ivec2 getDimensions() const noexcept
             {
                return {_width, _height};
             }
 
        private:
            void _update_color_attachments();
            void _clear_all_color_attachments(const glm::vec4& color);
 
            static void _blit(
                const Framebuffer* src,
                Framebuffer* target,
                const glm::ivec4& src_bounds,
                const glm::ivec4& target_bounds,
                const TargetBuffer& type,
                const uint8_t color_attachment_src,
                const uint8_t color_attachment_dest,
                const bool usefilter
            );
 
            std::map<unsigned int, std::shared_ptr<Texture>> _color_attachments;
            std::shared_ptr<Texture> _depth_attachment = {};
 
            unsigned int _width = 0;
            unsigned int _height = 0;
            unsigned int _fbo = 0;
            unsigned int _rbo = 0;
    };
}
 
#endif