glsl/ir_builder: Add `enum writemask`

Using this enum improves the readibility of calls to assign(), whose third
argument is a writemask.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Signed-off-by: Chad Versace <chad.versace@linux.intel.com>

diff --git a/src/glsl/ir_builder.h b/src/glsl/ir_builder.h
index f3aa0d76220dfea46edb8551943a85f45a6e47eb..82e37628ec70b29ebcde6adbcd9c8dd318286805 100644 (file)
--- a/src/glsl/ir_builder.h
+++ b/src/glsl/ir_builder.h
@@ -25,6 +25,15 @@
 
 namespace ir_builder {
 
+#ifndef WRITEMASK_X
+enum writemask {
+   WRITEMASK_X = 0x1,
+   WRITEMASK_Y = 0x2,
+   WRITEMASK_Z = 0x4,
+   WRITEMASK_W = 0x8,
+};
+#endif
+
 /**
  * This little class exists to let the helper expression generators
  * take either an ir_rvalue * or an ir_variable * to be automatically