From 358ec62a52e58f1a50f71ac51b4ba71d0591ceb3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Branimir=20Karad=C5=BEi=C4=87?= <branimirkaradzic@gmail.com>
Date: Sat, 30 Apr 2016 20:29:53 -0700
Subject: [PATCH] Updated glsl-optimizer.

---
 .../src/glsl/ir_print_metal_visitor.cpp              | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/3rdparty/glsl-optimizer/src/glsl/ir_print_metal_visitor.cpp b/3rdparty/glsl-optimizer/src/glsl/ir_print_metal_visitor.cpp
index f9988a31f..9f7071d95 100644
--- a/3rdparty/glsl-optimizer/src/glsl/ir_print_metal_visitor.cpp
+++ b/3rdparty/glsl-optimizer/src/glsl/ir_print_metal_visitor.cpp
@@ -1020,7 +1020,17 @@ void ir_print_metal_visitor::visit(ir_expression *ir)
 			const bool halfCast = (arg_prec == glsl_precision_medium || arg_prec == glsl_precision_low);
 			buffer.asprintf_append (halfCast ? "((half)1.0/(" : "(1.0/(");
 		} else {
-			buffer.asprintf_append ("%s(", operator_glsl_strs[ir->operation]);
+			switch(ir->operation) {
+				case ir_unop_dFdy:
+				case ir_unop_dFdy_coarse:
+				case ir_unop_dFdy_fine:
+					buffer.asprintf_append ("%s(-", operator_glsl_strs[ir->operation]);
+					break;
+
+				default:
+					buffer.asprintf_append ("%s(", operator_glsl_strs[ir->operation]);
+					break;
+			}
 		}
 		if (ir->operands[0])
 			ir->operands[0]->accept(this);