i915; Avoid the implicit flush on changing BUF_INFO

3DSTATE_BUF_INFO is an implicit flush of the piepline, so avoid emitting
that and associated state unless the destination pixmap has actually
changed. This is a win of around 3-5% for cairo-perf-trace, notably for
firefox.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/i830.h b/src/i830.h
index e410ec18..9a46af06 100644
--- a/src/i830.h
+++ b/src/i830.h
@@ -340,6 +340,7 @@ typedef struct intel_screen_private {
 	PicturePtr render_source_picture, render_mask_picture, render_dest_picture;
 	CARD32 render_source_solid;
 	CARD32 render_mask_solid;
+	PixmapPtr render_current_dest;
 	Bool render_source_is_solid;
 	Bool render_mask_is_solid;
 	Bool needs_render_state_emit;