uint32_t vbo_fifo; /* bitmask of vertex elements to be pushed to FIFO */
uint32_t vbo_user; /* bitmask of vertex buffers pointing to user memory */
uint32_t vbo_constant; /* bitmask of user buffers with stride 0 */
uint32_t vbo_fifo; /* bitmask of vertex elements to be pushed to FIFO */
uint32_t vbo_user; /* bitmask of vertex buffers pointing to user memory */
uint32_t vbo_constant; /* bitmask of user buffers with stride 0 */