While reading through the simulator, I found some interesting code that looks like it checks the sampler default color pointer against the bound set in STATE_BASE_ADDRESS. On failure, it appears to program it to the base address itself.
So I decided to try programming a legitimate bound, and lo and behold, border color worked. Unfortunately, it's not entirely reliable: piglit tests (such as tex-border-1) will still fail if you run them in a loop. +92 piglits on Sandybridge. Also fixes Lightsmark on Ivybridge. NOTE: This is a candidate for stable release branches. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=28924 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=38868 Signed-off-by: Kenneth Graunke <[email protected]> --- src/mesa/drivers/dri/i965/brw_misc_state.c | 8 +++++++- 1 files changed, 7 insertions(+), 1 deletions(-) v2: OUT_RELOC is your friend. Thanks to ickle for pointing out my silly mistake. Now regression free and fixing lots of tests. And demos! diff --git a/src/mesa/drivers/dri/i965/brw_misc_state.c b/src/mesa/drivers/dri/i965/brw_misc_state.c index 8e59a47..1a7d328 100644 --- a/src/mesa/drivers/dri/i965/brw_misc_state.c +++ b/src/mesa/drivers/dri/i965/brw_misc_state.c @@ -769,7 +769,13 @@ static void upload_state_base_address( struct brw_context *brw ) 1); /* Instruction base address: shader kernels (incl. SIP) */ OUT_BATCH(1); /* General state upper bound */ - OUT_BATCH(1); /* Dynamic state upper bound */ + /* Dynamic state upper bound. Although the documentation says that + * programming it to zero will cause it to be ignored, that is a lie. + * If this isn't programmed to a real bound, the sampler border color + * pointer is rejected, causing border color to mysteriously fail. + */ + OUT_RELOC(intel->batch.bo, I915_GEM_DOMAIN_INSTRUCTION, 0, + intel->batch.bo->size | 1); OUT_BATCH(1); /* Indirect object upper bound */ OUT_BATCH(1); /* Instruction access upper bound */ ADVANCE_BATCH(); -- 1.7.7.5 _______________________________________________ mesa-dev mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/mesa-dev
