gallium/u_gen_mipmap: rewrite using pipe->blit (v2)

This replaces u_gen_mipmap with an extremely simple implementation based
on pipe->blit. st/mesa is also cleaned up.

Pros:
- less code
- correct mipmap generation for NPOT 3D textures (u_blitter uses a better
  formula)
- queries are not affected by mipmap generation if drivers disable them

v2: add "first_layer", "last_layer" parameters, drop "face"
v2.1: add format
v2.2: document the format parameter

1 files changed, 0 insertions, 1 deletions

diff --git a/src/mesa/state_tracker/st_context.h b/src/mesa/state_tracker/st_context.h
index 0e00dd4fab6..361a24b1d71 100644
--- a/src/mesa/state_tracker/st_context.h
+++ b/src/mesa/state_tracker/st_context.h
@@ -188,7 +188,6 @@ struct st_context
    void *passthrough_fs;  /**< simple pass-through frag shader */
 
    enum pipe_texture_target internal_target;
-   struct gen_mipmap_state *gen_mipmap;
 
    struct cso_context *cso_context;