Mesa (master): i965: set size of txf_mcs payload vgrf properly

[Chris Forbes]

Module: Mesa
Branch: master
Commit: a61ae2aa01c9b1976ba4107c1564e0c3f94aea4d
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=a61ae2aa01c9b1976ba4107c1564e0c3f94aea4d

Author: Chris Forbes <chrisf at ijw.co.nz>
Date:   Sat Jan  4 15:27:54 2014 +1300

i965: set size of txf_mcs payload vgrf properly

Previously we left the size of this vgrf as 1, which caused register
allocation to be subtly broken. If we were lucky we would explode in
the post-alloc instruction scheduler; if we were unlucky we'd just stomp
on someone else and get broken rendering.

Fixes crash when running `tesseract` with the following settings:

   msaa 4
   glineardepth 0

Also fixes the piglit test:

  arb_sample_shading-builtin-gl-sample-id

Signed-off-by: Chris Forbes <chrisf at ijw.co.nz>
Cc: Anuj Phogat <anuj.phogat at gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=72859
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>

---

 src/mesa/drivers/dri/i965/brw_fs_visitor.cpp |    1 +
 1 file changed, 1 insertion(+)

diff --git a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
index 8e516a5..53cd0a1 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
@@ -1549,6 +1549,7 @@ fs_visitor::emit_mcs_fetch(ir_texture *ir, fs_reg coordinate, int sampler)
    }
 
    fs_inst *inst = emit(SHADER_OPCODE_TXF_MCS, dest, payload);
+   virtual_grf_sizes[payload.reg] = next.reg_offset;
    inst->base_mrf = -1;
    inst->mlen = next.reg_offset * reg_width;
    inst->header_present = false;