sub allocate_fbo_texture{
    my ($class,$width,$height) = @_;
    (my $texture_id) = glGenTextures_p(1);
    (my $fbo) = glGenFramebuffersEXT_p(1);
    (my $render_buffer) = glGenRenderbuffersEXT_p(1);
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, $fbo);
    glBindTexture(GL_TEXTURE_2D, $texture_id);
    glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, $render_buffer);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexImage2D_c(GL_TEXTURE_2D,0,GL_RGBA8,$width,$height,0,GL_RGBA,GL_UNSIGNED_BYTE,0);

    glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, $texture_id, 0);
    glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT24, $width,$height);
    glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, $render_buffer);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    return ($fbo,$texture_id, $render_buffer);
};

sub enable {
    my $self = shift;

    glPushAttrib(GL_VIEWPORT_BIT);
    glViewport(0,0,$self->width, $self->height);
    glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, $self->fbo);

    my $res = $self->shader->Enable();

    if ($self->config->{enable}) {
        $self->config->{enable}->($self);
    };
};