From 7e1e73c719d321feefedf4f3a78114ba1090d3e6 Mon Sep 17 00:00:00 2001
From: Juan Linietsky <reduzio@gmail.com>
Date: Sat, 10 Nov 2018 10:48:18 -0300
Subject: [PATCH] Avoid double underscore from breaking glsl compiler, fixes
 #12880

(cherry picked from commit f00b52270503de8bebc01f5bd8e813f54ee9b62c)
---
 drivers/gles3/shader_compiler_gles3.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gles3/shader_compiler_gles3.cpp b/drivers/gles3/shader_compiler_gles3.cpp
index 1f3b76f5cd5..d8e322af4e6 100644
--- a/drivers/gles3/shader_compiler_gles3.cpp
+++ b/drivers/gles3/shader_compiler_gles3.cpp
@@ -154,7 +154,8 @@ static String _opstr(SL::Operator p_op) {
 
 static String _mkid(const String &p_id) {
 
-	return "m_" + p_id;
+	String id = "m_" + p_id;
+	return id.replace("__", "_dus_"); //doubleunderscore is reserverd in glsl
 }
 
 static String f2sp0(float p_float) {