On 03/28/2012 10:58 AM, Eric Anholt wrote:
It turns out this field *is* used, and it's the stride between samples
from the buffer. Discovered during TBO debugging.
---
src/mesa/drivers/dri/i965/gen7_wm_surface_state.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
Oh, right. It's ignored by the OWORD_DUAL_BLOCK_READ message that we
use, but *is* used by the sampler messages. I discovered this when
cherry-picking my change to use LD/samplers for constants on Gen7...but
forgot to update the comment. Sorry about that!
Reviewed-by: Kenneth Graunke <[email protected]>
diff --git a/src/mesa/drivers/dri/i965/gen7_wm_surface_state.c
b/src/mesa/drivers/dri/i965/gen7_wm_surface_state.c
index c52f6aa..57fa540 100644
--- a/src/mesa/drivers/dri/i965/gen7_wm_surface_state.c
+++ b/src/mesa/drivers/dri/i965/gen7_wm_surface_state.c
@@ -157,7 +157,7 @@ gen7_create_constant_surface(struct brw_context *brw,
surf->ss2.width = w& 0x7f; /* bits 6:0 of size or width */
surf->ss2.height = (w>> 7)& 0x1fff; /* bits 19:7 of size or width */
surf->ss3.depth = (w>> 20)& 0x7f; /* bits 26:20 of size or width */
- surf->ss3.pitch = (16 - 1); /* ignored */
+ surf->ss3.pitch = (16 - 1); /* stride between samples */
gen7_set_surface_tiling(surf, I915_TILING_NONE); /* tiling now allowed */
/* Emit relocation to surface contents. Section 5.1.1 of the gen4
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