X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Fglsl%2Fsyntax.cpp;h=cb50fee18b79538c126482594a023ea8f3864001;hp=469ce5a602c2f22a464a5896c003c5aa209d29ef;hb=b89239e1d616f0c1d8e432b7df1eca149585cf5e;hpb=2e0ed3f7d23f09de7b4b09c2f132c316ce703d9a

diff --git a/source/glsl/syntax.cpp b/source/glsl/syntax.cpp
index 469ce5a6..cb50fee1 100644
--- a/source/glsl/syntax.cpp
+++ b/source/glsl/syntax.cpp
@@ -464,6 +464,37 @@ Module::Module():
 	shared(Stage::SHARED)
 { }
 
+
+string get_unused_variable_name(const Block &block, const string &base, const string &prefix_hint)
+{
+	string name = base;
+
+	bool prefixed = false;
+	unsigned number = 1;
+	unsigned size_without_number = name.size();
+	while(block.variables.count(name))
+	{
+		if(!prefixed && !prefix_hint.empty())
+		{
+			if(name.front()!='_')
+				name = "_"+name;
+			name = prefix_hint+name;
+			if(name.front()!='_')
+				name = "_"+name;
+			prefixed = true;
+			size_without_number = name.size();
+		}
+		else
+		{
+			name.erase(size_without_number);
+			name += format("_%d", number);
+			++number;
+		}
+	}
+
+	return name;
+}
+
 } // namespace SL
 } // namespace GL
 } // namespace Msp