mesa/gallium: add MESA_MAP_ONCE / PIPE_MAP_ONCE
If set, this bit tells the driver that the buffer will only be mapped once.
radeonsi uses this knowledge to disable its "never unmap buffers" optimisations.
Closes: #3660 (closed)
If set, this bit tells the driver that the buffer will only be mapped once.
radeonsi uses this knowledge to disable its "never unmap buffers" optimisations.
Closes: #3660 (closed)