From: Dave Airlie <airlied@redhat.com>
Date: Sat, 19 Dec 2015 04:43:14 +0000 (+1000)
Subject: st/glsl_to_tgsi: setup writemask for double arrays and matricies.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=7351c7684f75704dfef82a25177e6c5284d8bb0a;p=mesa.git

st/glsl_to_tgsi: setup writemask for double arrays and matricies.

It's important for the double instruction emission code that
the writemasks are correct going in for double so it know
which channels to replicate.

This fixes it for the array and matrix cases.

Signed-off-by: Dave Airlie <airlied@redhat.com>
---

diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index 6eb31b330b5..133ba3714a8 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -2754,7 +2754,26 @@ glsl_to_tgsi_visitor::visit(ir_assignment *ir)
     */
    if (ir->write_mask == 0) {
       assert(!ir->lhs->type->is_scalar() && !ir->lhs->type->is_vector());
-      l.writemask = WRITEMASK_XYZW;
+
+      if (ir->lhs->type->is_array() || ir->lhs->type->without_array()->is_matrix()) {
+         if (ir->lhs->type->without_array()->is_double()) {
+            switch (ir->lhs->type->without_array()->vector_elements) {
+            case 1:
+               l.writemask = WRITEMASK_X;
+               break;
+            case 2:
+               l.writemask = WRITEMASK_XY;
+               break;
+            case 3:
+               l.writemask = WRITEMASK_XYZ;
+               break;
+            case 4:
+               l.writemask = WRITEMASK_XYZW;
+               break;
+            }
+         } else
+            l.writemask = WRITEMASK_XYZW;
+      }
    } else if (ir->lhs->type->is_scalar() &&
               !ir->lhs->type->is_double() &&
               ir->lhs->variable_referenced()->data.mode == ir_var_shader_out) {