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-rw-r--r--src/mesa/drivers/dri/i965/brw_fs.cpp2
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 0595488c9c..723ebca61b 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