mesa: Expose function to calculate whether a shader image unit is valid.

A future commit will remove all texture object-dependent derived state
from the image unit struct to make validation unnecessary on texture
state changes.  Instead of checking gl_image_unit::_Valid drivers will
be required to call this function when needed to find out whether an
image unit is in a valid state and whether access from the shader is
allowed.

Tested-by: Ye Tian <[email protected]>
CC: "11.0" <[email protected]>
Reviewed-by: Ian Romanick <[email protected]>

0 files changed, 0 insertions, 0 deletions