Encapsulate expressions with ternary operators with brackets. This preserves the…

src/compiler/OutputGLSL.cpp

@@ -391,13 +391,17 @@ bool TOutputGLSL::visitSelection(Visit visit, TIntermSelection* node)
 
     if (node->usesTernaryOperator())
     {
-        out << "(";
+        // Notice two brackets at the beginning and end. The outer ones
+        // encapsulate the whole ternary expression. This preserves the
+        // order of precedence when ternary expressions are used in a
+        // compound expression, i.e., c = 2 * (a < b ? 1 : 2).
+        out << "((";
         node->getCondition()->traverse(this);
         out << ") ? (";
         node->getTrueBlock()->traverse(this);
         out << ") : (";
         node->getFalseBlock()->traverse(this);
-        out << ")";
+        out << "))";
     }
     else
     {