Mesa (master): i965: Set vertical alignment unit to 4 on Broadwell.
Kenneth Graunke
kwg at kemper.freedesktop.org
Mon Dec 2 21:25:10 UTC 2013
Module: Mesa
Branch: master
Commit: 1110ba4c088e41548090d52d669157c3e9f6f9fa
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=1110ba4c088e41548090d52d669157c3e9f6f9fa
Author: Kenneth Graunke <kenneth at whitecape.org>
Date: Sat Dec 15 01:14:03 2012 -0800
i965: Set vertical alignment unit to 4 on Broadwell.
Broadwell doesn't support a surface vertical alignment of 2. It only
supports VALIGN_4, VALIGN_8, or VALIGN_16. I chose 4 since it's the
least wasteful.
v2: Replace my comment with a better one from Eric. Move Broadwell
checks earlier so it's more obvious that "return 2" won't be hit.
Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Eric Anholt <eric at anholt.net>
---
src/mesa/drivers/dri/i965/brw_tex_layout.c | 6 ++++++
1 files changed, 6 insertions(+), 0 deletions(-)
diff --git a/src/mesa/drivers/dri/i965/brw_tex_layout.c b/src/mesa/drivers/dri/i965/brw_tex_layout.c
index 2c81eed..16af19f 100644
--- a/src/mesa/drivers/dri/i965/brw_tex_layout.c
+++ b/src/mesa/drivers/dri/i965/brw_tex_layout.c
@@ -117,6 +117,12 @@ intel_vertical_texture_alignment_unit(struct brw_context *brw,
if (format == MESA_FORMAT_S8)
return brw->gen >= 7 ? 8 : 4;
+ /* Broadwell only supports VALIGN of 4, 8, and 16. The BSpec says 4
+ * should always be used, except for stencil buffers, which should be 8.
+ */
+ if (brw->gen >= 8)
+ return 4;
+
if (multisampled)
return 4;
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