void (*bo_unmap)(struct gbm_bo *bo, void *map_data);
int (*bo_write)(struct gbm_bo *bo, const void *buf, size_t data);
int (*bo_get_fd)(struct gbm_bo *bo);
+ int (*bo_get_planes)(struct gbm_bo *bo);
void (*bo_destroy)(struct gbm_bo *bo);
struct gbm_surface *(*surface_create)(struct gbm_device *gbm,