PP: Recognize the '::' token, and translate appropriately to GLSL/HLSL token.

glslang/MachineIndependent/preprocessor/PpAtom.cpp

@@ -120,6 +120,8 @@ const struct {
     { PpAtomDecrement,      "--" },
     { PpAtomIncrement,      "++" },
 
+    { PpAtomColonColon,     "::" },
+
     { PpAtomDefine,         "define" },
     { PpAtomUndef,          "undef" },
     { PpAtomIf,             "if" },

glslang/MachineIndependent/preprocessor/PpScanner.cpp

@@ -691,6 +691,12 @@ int TPpContext::tStringInput::scan(TPpToken* ppToken)
                 pp->parseContext.ppError(ppToken->loc, "End of line in string", "string", "");
             }
             return PpAtomConstString;
+        case ':':
+            ch = getch();
+            if (ch == ':')
+                return PpAtomColonColon;
+            ungetch();
+            return ':';
         }
 
         ch = getch();

glslang/MachineIndependent/preprocessor/PpTokens.h

@@ -117,6 +117,8 @@ enum EFixedAtoms {
     PpAtomDecrement,
     PpAtomIncrement,
 
+    PpAtomColonColon,
+
     PpAtomPaste,
 
     // Constants