oil-backend-opengl.c

    glGenFramebuffers(1, &(priv->framebuffer));
    glGenRenderbuffers(1, &(priv->depthbuffer));
    glGenTextures(1, &(priv->colorbuffer));
    
    /* set up the color buffer */
    glBindTexture(GL_TEXTURE_2D, priv->colorbuffer);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8UI, im->width, im->height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
    glBindTexture(GL_TEXTURE_2D, 0);
    
    /* set up our depth buffer */
    glBindRenderbuffer(GL_RENDERBUFFER, priv->depthbuffer);
    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, im->width, im->height);
    glBindRenderbuffer(GL_RENDERBUFFER, 0);
    
    /* bind everything to our framebuffer */
    glBindFramebuffer(GL_FRAMEBUFFER, priv->framebuffer);
    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, priv->colorbuffer, 0);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, priv->depthbuffer);
    
    /* make sure we're good */
    if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
        /* FIXME fail! */
        printf("ack! failed to make framebuffer! 0x%x\n", glCheckFramebufferStatus(GL_FRAMEBUFFER));
    }