i965/brw_reg: struct constructor now needs explicit negate and abs values.

We were assuming, when constructing a new brw_reg struct, that the
negate and abs register modifiers would not be present by default in
the new register.

Now, we force explicitly setting these values when constructing a new
register.

This will avoid problems like forgetting to properly set them when we
are using a previous register to generate this new register, as it was
happening in the dFdx and dFdy generation functions.

Fixes piglit test shaders/glsl-deriv-varyings

Cc: "10.4 10.3" <[email protected]>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=82991
Reviewed-by: Matt Turner <[email protected]>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_vec4.cpp b/src/mesa/drivers/dri/i965/brw_vec4.cpp
index 9d080d63fa3..2fb578e11f9 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4.cpp
@@ -1535,6 +1535,8 @@ vec4_visitor::get_timestamp()
    src_reg ts = src_reg(brw_reg(BRW_ARCHITECTURE_REGISTER_FILE,
                                 BRW_ARF_TIMESTAMP,
                                 0,
+                                0,
+                                0,
                                 BRW_REGISTER_TYPE_UD,
                                 BRW_VERTICAL_STRIDE_0,
                                 BRW_WIDTH_4,