From: Eric Anholt <eric@anholt.net>
Date: Tue, 28 Sep 2010 17:18:31 +0000 (-0700)
Subject: i965: Subtract instead of adding when computing y delta in new FS backend.
X-Git-Tag: 062012170305~9444^2~567
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9e96c737f8cb6faebf7c7339cfcf14f80ed8e73c;p=profile%2Fivi%2Fmesa.git

i965: Subtract instead of adding when computing y delta in new FS backend.

Fixes 7 piglit cases.
---

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 0595488..723ebca 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -1335,7 +1335,7 @@ fs_visitor::emit_interpolation()
    emit(fs_inst(BRW_OPCODE_ADD,
 		this->delta_y,
 		this->pixel_y,
-		fs_reg(brw_vec1_grf(1, 1))));
+		fs_reg(negate(brw_vec1_grf(1, 1)))));
 
    this->current_annotation = "compute pos.w and 1/pos.w";
    /* Compute wpos.  Unlike many other varying inputs, we usually need it