gallium: Add texture usage flags, special-case allocation of display targets

For many envirionments it's necessary to allocate display targets
in a window-system friendly manner.  Add facilities so that a driver
can tell if a texture is likely to be used to generate a display surface
and if use special allocation paths if necessary.

Hook up softpipe to call into the winsys->surface_alloc_storage()
routine in this case, though we probably want to change that interface
slightly also.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/mesa/state_tracker/st_texture.h b/src/mesa/state_tracker/st_texture.h
index f6d5733e210..6a9f08ec6b7 100644
--- a/src/mesa/state_tracker/st_texture.h
+++ b/src/mesa/state_tracker/st_texture.h
@@ -105,7 +105,8 @@ st_texture_create(struct st_context *st,
                   GLuint width0,
                   GLuint height0,
                   GLuint depth0,
-                  GLuint compress_byte);
+                  GLuint compress_byte,
+                  GLuint tex_usage );
 
 
 /* Check if an image fits into an existing texture object.