Mesa (master): i965: write layer if gl_Layer is used in VS

[Jordan Justen]

Module: Mesa
Branch: master
Commit: a16a2d7147865634d68151d681a399f669146ff1
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=a16a2d7147865634d68151d681a399f669146ff1

Author: Jordan Justen <jordan.l.justen at intel.com>
Date:   Wed Apr 17 16:17:50 2013 -0700

i965: write layer if gl_Layer is used in VS

This is enabled by the AMD_vertex_shader_layer extension.

Signed-off-by: Jordan Justen <jordan.l.justen at intel.com>
Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>

---

 src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
index e5c1cec..f14529a 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_visitor.cpp
@@ -2597,6 +2597,10 @@ vec4_visitor::emit_psiz_and_flags(struct brw_reg reg)
          emit(MOV(brw_writemask(reg, WRITEMASK_W),
                   src_reg(output_reg[VARYING_SLOT_PSIZ])));
       }
+      if (prog_data->vue_map.slots_valid & VARYING_BIT_LAYER) {
+         emit(MOV(retype(brw_writemask(reg, WRITEMASK_Y), BRW_REGISTER_TYPE_D),
+                  src_reg(output_reg[VARYING_SLOT_LAYER])));
+      }
    }
 }