diff options
Diffstat (limited to 'src/3rdparty/angle/src/compiler/translator/HashNames.cpp')
-rw-r--r-- | src/3rdparty/angle/src/compiler/translator/HashNames.cpp | 72 |
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 |