X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Fglsl%2Fsyntax.cpp;h=c94e2e27042c63a6a7f0b2c91f3d26c5b00f1e30;hb=0388083;hp=469ce5a602c2f22a464a5896c003c5aa209d29ef;hpb=a4cd67f1c9f1f375bacacfbb421d40f78a22644b;p=libs%2Fgl.git

diff --git a/source/glsl/syntax.cpp b/source/glsl/syntax.cpp
index 469ce5a6..c94e2e27 100644
--- a/source/glsl/syntax.cpp
+++ b/source/glsl/syntax.cpp
@@ -464,6 +464,41 @@ 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(1)
+	{
+		bool unused = true;
+		for(const Block *b=█ (unused && b); b=b->parent)
+			unused = !b->variables.count(name);
+		if(unused)
+			return 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;
+		}
+	}
+}
+
 } // namespace SL
 } // namespace GL
 } // namespace Msp