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, 8 insertions, 2 deletions

diff --git a/src/mesa/state_tracker/st_cb_texture.c b/src/mesa/state_tracker/st_cb_texture.c
index 4cca3364c1..06caa06e77 100644
--- a/src/mesa/state_tracker/st_cb_texture.c
+++ b/src/mesa/state_tracker/st_cb_texture.c
@@ -333,7 +333,9 @@ guess_and_alloc_texture(struct st_context *st,
                                  width,
                                  height,
                                  depth,
-                                 comp_byte);
+                                 comp_byte,
+                                 ( PIPE_TEXTURE_USAGE_RENDER_TARGET |
+                                   PIPE_TEXTURE_USAGE_SAMPLER ));
 
    DBG("%s - success\n", __FUNCTION__);
 }
@@ -1501,7 +1503,11 @@ st_finalize_texture(GLcontext *ctx,
                                     firstImage->base.Width2,
                                     firstImage->base.Height2,
                                     firstImage->base.Depth2,
-                                    comp_byte);
+                                    comp_byte,
+
+                                    ( PIPE_TEXTURE_USAGE_RENDER_TARGET |
+                                      PIPE_TEXTURE_USAGE_SAMPLER ));
+
       if (!stObj->pt) {
          _mesa_error(ctx, GL_OUT_OF_MEMORY, "glTexImage");
          return GL_FALSE;