1 files changed, 72 insertions, 0 deletions
diff --git a/src/3rdparty/angle/src/compiler/translator/HashNames.cpp b/src/3rdparty/angle/src/compiler/translator/HashNames.cpp
new file mode 100644
index 0000000000..6bc90faf94
--- /dev/null
+++ b/src/3rdparty/angle/src/compiler/translator/HashNames.cpp
@@ -0,0 +1,72 @@
+//
+// Copyright (c) 2017 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+#include "compiler/translator/HashNames.h"
+
+#include "compiler/translator/IntermNode.h"
+
+namespace sh
+{
+
+namespace
+{
+
+// GLSL ES 3.00.6 section 3.9: the maximum length of an identifier is 1024 characters.
+static const unsigned int kESSLMaxIdentifierLength = 1024u;
+
+static const char *kHashedNamePrefix = "webgl_";
+
+// Can't prefix with just _ because then we might introduce a double underscore, which is not safe
+// in GLSL (ESSL 3.00.6 section 3.8: All identifiers containing a double underscore are reserved for
+// use by the underlying implementation). u is short for user-defined.
+static const char *kUnhashedNamePrefix              = "_u";
+static const unsigned int kUnhashedNamePrefixLength = 2u;
+
+TString HashName(const TString &name, ShHashFunction64 hashFunction)
+{
+    ASSERT(!name.empty());
+    ASSERT(hashFunction);
+    khronos_uint64_t number = (*hashFunction)(name.c_str(), name.length());
+    TStringStream stream;
+    stream << kHashedNamePrefix << std::hex << number;
+    TString hashedName = stream.str();
+    return hashedName;
+}
+
+}  // anonymous namespace
+
+TString HashName(const TName &name, ShHashFunction64 hashFunction, NameMap *nameMap)
+{
+    if (name.getString().empty() || name.isInternal())
+    {
+        return name.getString();
+    }
+    if (hashFunction == nullptr)
+    {
+        if (name.getString().length() + kUnhashedNamePrefixLength > kESSLMaxIdentifierLength)
+        {
+            // If the identifier length is already close to the limit, we can't prefix it. This is
+            // not a problem since there are no builtins or ANGLE's internal variables that would
+            // have as long names and could conflict.
+            return name.getString();
+        }
+        return kUnhashedNamePrefix + name.getString();
+    }
+    if (nameMap)
+    {
+        NameMap::const_iterator it = nameMap->find(name.getString().c_str());
+        if (it != nameMap->end())
+            return it->second.c_str();
+    }
+    TString hashedName = HashName(name.getString(), hashFunction);
+    if (nameMap)
+    {
+        (*nameMap)[name.getString().c_str()] = hashedName.c_str();
+    }
+    return hashedName;
+}
+
+}  // namespace sh