Uses of the bits for allocation are offset by 16, and
VERT_BIT_GENERIC0 already has the 16 offset. As a result, it was
preventing the wrong thing from being allocated.
* be explicitly assigned by via glBindAttribLocation. Mark it as reserved
* to prevent it from being automatically allocated below.
*/
- used_locations |= VERT_BIT_GENERIC0;
+ used_locations |= (1 << 0);
for (unsigned i = 0; i < num_attr; i++) {
/* Mask representing the contiguous slots that will be used by this