Mesa (7.10): i965/fs: Correctly set up gl_FragCoord.w on Sandybridge.

[Ian Romanick]

Module: Mesa
Branch: 7.10
Commit: 2171197559061dc597717bd0f1cf361a11b08f21
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=2171197559061dc597717bd0f1cf361a11b08f21

Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Sat Feb 19 16:48:24 2011 -0800

i965/fs: Correctly set up gl_FragCoord.w on Sandybridge.

pixel_w is the final result; wpos_w is used on gen4 to compute it.

NOTE: This is a candidate for the 7.10 branch.

Reviewed-by: Eric Anholt <eric at anholt.net>
(cherry picked from commit 4a3b28113c3d23ba21bb8b8f5ebab7c567083a6d)

---

 src/mesa/drivers/dri/i965/brw_fs.cpp |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index eaa9ae6..e24c728 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -493,7 +493,7 @@ fs_visitor::emit_fragcoord_interpolation(ir_variable *ir)
    wpos.reg_offset++;
 
    /* gl_FragCoord.w: Already set up in emit_interpolation */
-   emit(fs_inst(BRW_OPCODE_MOV, wpos, this->wpos_w));
+   emit(fs_inst(BRW_OPCODE_MOV, wpos, this->pixel_w));
 
    return reg;
 }