svga: eliminiate unnecessary constant buffer updates

Currently if the texture binding is changed, emit_fs_consts()
is triggered to update texture scaling factor for
rectangle texture or texture buffer size in the constant buffer.
But the update is only relevant if the texture binding includes
a rectangle texture or a texture buffer.

To eliminate the unnecessary constant buffer updates due to other texture
binding changes, a new flag SVGA_NEW_TEXTURE_CONSTS will be used
to trigger fragment shader constant buffer update when a rectangle texture
or a texture buffer is bound.

With this patch, the number of constant buffer updates in Lightsmark2008
reduces from hundreds per frame to about 28 per frame.

Reviewed-by: Brian Paul <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/gallium/drivers/svga/svga_state_constants.c b/src/gallium/drivers/svga/svga_state_constants.c
index 51f393f9b0c..8784f47413f 100644
--- a/src/gallium/drivers/svga/svga_state_constants.c
+++ b/src/gallium/drivers/svga/svga_state_constants.c
@@ -788,7 +788,7 @@ struct svga_tracked_state svga_hw_fs_constants =
    "hw fs params",
    (SVGA_NEW_FS_CONST_BUFFER |
     SVGA_NEW_FS_VARIANT |
-    SVGA_NEW_TEXTURE_BINDING),
+    SVGA_NEW_TEXTURE_CONSTS),
    emit_fs_consts
 };