FrameBuffer.cpp

#include "FrameBuffer.hpp"

#include <stdexcept>

namespace megu {
    FrameBuffer::FrameBuffer(GLuint width, GLuint height) 
    : _id(0), _rbo_id(0), _texture() {
        glGenFramebuffers(1, &this->_id);
        glBindFramebuffer(GL_FRAMEBUFFER, this->_id);

        this->_texture.store(width, height, NULL, Texture::Format::RGB);
        this->_texture.setSmoothing(false);
        this->_texture.setWraping(Texture::Wraping::CLAMP_TO_EDGE, Texture::Axis::S | Texture::Axis::T);

        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, this->_texture.identifier(), 0);

        glGenRenderbuffers(1, &this->_rbo_id);
        glBindRenderbuffer(GL_RENDERBUFFER, this->_rbo_id);
        glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, width, height);
        glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, this->_rbo_id);

        glBindFramebuffer(GL_FRAMEBUFFER, 0);

        if(!this->usable()) {
            throw std::runtime_error("Incomplete FrameBuffer.");
        }
    }

    FrameBuffer::~FrameBuffer() {
        glDeleteRenderbuffers(1, &this->_rbo_id);
        glDeleteFramebuffers(1, &this->_id);
    }

    bool FrameBuffer::usable() const {
        this->bind();
        return glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE;
    }

    void FrameBuffer::bind() const {
        glBindFramebuffer(GL_FRAMEBUFFER, this->_id);
    }

    void FrameBuffer::unbind() const {
        glBindFramebuffer(GL_FRAMEBUFFER, 0);
    }

    void FrameBuffer::BindDefaultFrameBuffer() {
        glBindFramebuffer(GL_FRAMEBUFFER, 0);
    }
}