gallium: add new pipe_screen::can_create_resource() function

Used to implement proxy textures.  If a gallium driver doesn't implement
this function we'll just continue to use the core Mesa fallback code.

Without this hook we really have no good way to implement OpenGL proxy
textures with gallium drivers.

Reviewed-by: Jose Fonseca <[email protected]>

1 files changed, 8 insertions, 0 deletions

diff --git a/src/gallium/include/pipe/p_screen.h b/src/gallium/include/pipe/p_screen.h
index fdf6fa2d3f9..dff503676f8 100644
--- a/src/gallium/include/pipe/p_screen.h
+++ b/src/gallium/include/pipe/p_screen.h
@@ -138,6 +138,14 @@ struct pipe_screen {
                                          enum pipe_video_profile profile );
 
    /**
+    * Check if we can actually create the given resource (test the dimension,
+    * overall size, etc).  Used to implement proxy textures.
+    * \return TRUE if size is OK, FALSE if too large.
+    */
+   boolean (*can_create_resource)(struct pipe_screen *screen,
+                                  const struct pipe_resource *templat);
+                               
+   /**
     * Create a new texture object, using the given template info.
     */
    struct pipe_resource * (*resource_create)(struct pipe_screen *,