Mesa (master): i965: make BRW_COMPRESSION_2NDHALF valid for brw_SAMPLE

[Chia-I Wu]

Module: Mesa
Branch: master
Commit: 44f0777f17df13f504602e76d7f5ba0edc642081
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=44f0777f17df13f504602e76d7f5ba0edc642081

Author: Chia-I Wu <olv at lunarg.com>
Date:   Fri Sep 27 15:23:56 2013 +0800

i965: make BRW_COMPRESSION_2NDHALF valid for brw_SAMPLE

SIMD8 sampler messages are allowed in SIMD16 mode, and they could not work
without BRW_COMPRESSION_2NDHALF.  Later PRMs (gen5 and later) do not
explicitly state whether BRW_COMPRESSION_2NDHALF is allowed, but they do have
examples using send with SecHalf.  It should be safe to assume SecHalf is
valid.

Signed-off-by: Chia-I Wu <olv at lunarg.com>
Reviewed-by: Eric Anholt <eric at anholt.net>

---

 src/mesa/drivers/dri/i965/brw_eu_emit.c |   17 ++++++++++++++++-
 1 files changed, 16 insertions(+), 1 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_eu_emit.c b/src/mesa/drivers/dri/i965/brw_eu_emit.c
index d9ba110..33245d7 100644
--- a/src/mesa/drivers/dri/i965/brw_eu_emit.c
+++ b/src/mesa/drivers/dri/i965/brw_eu_emit.c
@@ -2197,7 +2197,22 @@ void brw_SAMPLE(struct brw_compile *p,
 
    insn = next_insn(p, BRW_OPCODE_SEND);
    insn->header.predicate_control = 0; /* XXX */
-   insn->header.compression_control = BRW_COMPRESSION_NONE;
+
+   /* From the 965 PRM (volume 4, part 1, section 14.2.41):
+    *
+    *    "Instruction compression is not allowed for this instruction (that
+    *     is, send). The hardware behavior is undefined if this instruction is
+    *     set as compressed. However, compress control can be set to "SecHalf"
+    *     to affect the EMask generation."
+    *
+    * No similar wording is found in later PRMs, but there are examples
+    * utilizing send with SecHalf.  More importantly, SIMD8 sampler messages
+    * are allowed in SIMD16 mode and they could not work without SecHalf.  For
+    * these reasons, we allow BRW_COMPRESSION_2NDHALF here.
+    */
+   if (insn->header.compression_control != BRW_COMPRESSION_2NDHALF)
+      insn->header.compression_control = BRW_COMPRESSION_NONE;
+
    if (brw->gen < 6)
       insn->header.destreg__conditionalmod = msg_reg_nr;