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i965: set size of txf_mcs payload vgrf properly

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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@ijw.co.nz>
Cc: Anuj Phogat <anuj.phogat@gmail.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=72859
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Chris Forbes 2014-01-04 15:27:54 +13:00
parent eb212c5a30
commit a61ae2aa01
1 changed files with 1 additions and 0 deletions
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src/mesa/drivers/dri/i965/brw_fs_visitor.cpp
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@ -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;