Mesa (master): svga: Fix fs key size computation and key comparison.

[Michał Król]

Module: Mesa
Branch: master
Commit: 8d38ef455196e6ddda22536e435638a02a7b48f3
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=8d38ef455196e6ddda22536e435638a02a7b48f3

Author: Michal Krol <michal at vmware.com>
Date:   Wed Jan  6 18:36:45 2010 +0100

svga: Fix fs key size computation and key comparison.

This also allows us to have texture_target
back as a bitfield and save us a few bytes.

---

 src/gallium/drivers/svga/svga_state_fs.c |    9 +++++++--
 src/gallium/drivers/svga/svga_tgsi.h     |    5 ++---
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/gallium/drivers/svga/svga_state_fs.c b/src/gallium/drivers/svga/svga_state_fs.c
index 272d1dd..bba80a9 100644
--- a/src/gallium/drivers/svga/svga_state_fs.c
+++ b/src/gallium/drivers/svga/svga_state_fs.c
@@ -40,8 +40,13 @@
 static INLINE int compare_fs_keys( const struct svga_fs_compile_key *a,
                                    const struct svga_fs_compile_key *b )
 {
-   unsigned keysize = svga_fs_key_size( a );
-   return memcmp( a, b, keysize );
+   unsigned keysize_a = svga_fs_key_size( a );
+   unsigned keysize_b = svga_fs_key_size( b );
+
+   if (keysize_a != keysize_b) {
+      return (int)(keysize_a - keysize_b);
+   }
+   return memcmp( a, b, keysize_a );
 }
 
 
diff --git a/src/gallium/drivers/svga/svga_tgsi.h b/src/gallium/drivers/svga/svga_tgsi.h
index 043b991..737a221 100644
--- a/src/gallium/drivers/svga/svga_tgsi.h
+++ b/src/gallium/drivers/svga/svga_tgsi.h
@@ -56,7 +56,7 @@ struct svga_fs_compile_key
       unsigned compare_func:3;
       unsigned unnormalized:1;
       unsigned width_height_idx:7;
-      ubyte texture_target;
+      unsigned texture_target:8;
    } tex[PIPE_MAX_SAMPLERS];
 };
 
@@ -119,8 +119,7 @@ static INLINE unsigned svga_vs_key_size( const struct svga_vs_compile_key *key )
 
 static INLINE unsigned svga_fs_key_size( const struct svga_fs_compile_key *key )
 {
-   return (const char *)&key->tex[key->num_textures].texture_target -
-      (const char *)key;
+   return (const char *)&key->tex[key->num_textures] - (const char *)key;
 }
 
 struct svga_shader_result *