From: Eric Anholt <eric@anholt.net>
Date: Sun, 5 Sep 2010 03:54:52 +0000 (-0700)
Subject: i965: Make pixel_xy results UW.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=32b84ef4ca50998914184fc4600d8e43674a9a22;p=mesa.git

i965: Make pixel_xy results UW.

There is a restriction on the destination of an operation involving a
vector immediate being 128-bit aligned and the destination horizontal
stride being equivalent to 2 bytes.  Fixes bad pixel_x results from
gl_FragCoord, where each pair had the same value.
---

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 811d1082284..25a20e76042 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -1211,6 +1211,8 @@ fs_visitor::emit_interpolation()
    this->current_annotation = "compute pixel centers";
    this->pixel_x = fs_reg(this, glsl_type::uint_type);
    this->pixel_y = fs_reg(this, glsl_type::uint_type);
+   this->pixel_x.type = BRW_REGISTER_TYPE_UW;
+   this->pixel_y.type = BRW_REGISTER_TYPE_UW;
    emit(fs_inst(BRW_OPCODE_ADD,
 		this->pixel_x,
 		fs_reg(stride(suboffset(g1_uw, 4), 2, 4, 0)),