frame_buffer.cpp

#include "frame_buffer.hpp"
#include "decl.hpp"

namespace rematrix {

frame_buffer::frame_buffer()
{
    glGenFramebuffers(1, &id_);
    if (id_ == 0) {
        throw runtime_error("couldn't generate frame buffer");
    }
}

frame_buffer::frame_buffer(frame_buffer&& other) noexcept
    : id_ { other.id_ }
{
    other.id_ = 0;
}

frame_buffer::~frame_buffer()
{
    glDeleteFramebuffers(1, &id_);
}

frame_buffer& frame_buffer::operator=(frame_buffer&& other) noexcept
{
    id_ = other.id_;
    other.id_ = 0;
    return *this;
}

void frame_buffer::bind()
{
    glBindFramebuffer(GL_FRAMEBUFFER, id_);
}

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

void frame_buffer::draw_buffers(initializer_list<GLenum> bufs)
{
    const vector<GLenum> bufs2 { bufs };
    glDrawBuffers(bufs2.size(), bufs2.data());
}

void frame_buffer::attach(GLenum point, GLuint texture_id)
{
    glFramebufferTexture2D(GL_FRAMEBUFFER,
        point,
        GL_TEXTURE_2D,
        texture_id,
        0);
}

void frame_buffer::check_complete() const
{
    if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
        throw runtime_error("frame buffer isn't complete");
    }
}

} // namespace rematrix