webkitgtk-2.16.5HEADwebkitgtk-2.16.5master

1 files changed, 71 insertions, 0 deletions

diff --git a/Source/ThirdParty/ANGLE/src/compiler/translator/RegenerateStructNames.cpp b/Source/ThirdParty/ANGLE/src/compiler/translator/RegenerateStructNames.cpp
new file mode 100644
index 000000000..1a7d8aaf8
--- /dev/null
+++ b/Source/ThirdParty/ANGLE/src/compiler/translator/RegenerateStructNames.cpp
@@ -0,0 +1,71 @@
+//
+// Copyright (c) 2002-2014 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 "common/debug.h"
+#include "compiler/translator/RegenerateStructNames.h"
+
+void RegenerateStructNames::visitSymbol(TIntermSymbol *symbol)
+{
+    ASSERT(symbol);
+    TType *type = symbol->getTypePointer();
+    ASSERT(type);
+    TStructure *userType = type->getStruct();
+    if (!userType)
+        return;
+
+    if (mSymbolTable.findBuiltIn(userType->name(), mShaderVersion))
+    {
+        // Built-in struct, do not touch it.
+        return;
+    }
+
+    int uniqueId = userType->uniqueId();
+
+    ASSERT(mScopeDepth > 0);
+    if (mScopeDepth == 1)
+    {
+        // If a struct is defined at global scope, we don't map its name.
+        // This is because at global level, the struct might be used to
+        // declare a uniform, so the same name needs to stay the same for
+        // vertex/fragment shaders. However, our mapping uses internal ID,
+        // which will be different for the same struct in vertex/fragment
+        // shaders.
+        // This is OK because names for any structs defined in other scopes
+        // will begin with "_webgl", which is reserved. So there will be
+        // no conflicts among unmapped struct names from global scope and
+        // mapped struct names from other scopes.
+        // However, we need to keep track of these global structs, so if a
+        // variable is used in a local scope, we don't try to modify the
+        // struct name through that variable.
+        mDeclaredGlobalStructs.insert(uniqueId);
+        return;
+    }
+    if (mDeclaredGlobalStructs.count(uniqueId) > 0)
+        return;
+    // Map {name} to _webgl_struct_{uniqueId}_{name}.
+    const char kPrefix[] = "_webgl_struct_";
+    if (userType->name().find(kPrefix) == 0)
+    {
+        // The name has already been regenerated.
+        return;
+    }
+    std::string id = Str(uniqueId);
+    TString tmp = kPrefix + TString(id.c_str());
+    tmp += "_" + userType->name();
+    userType->setName(tmp);
+}
+
+bool RegenerateStructNames::visitBlock(Visit, TIntermBlock *block)
+{
+    ++mScopeDepth;
+    TIntermSequence &sequence = *(block->getSequence());
+    for (TIntermNode *node : sequence)
+    {
+        node->traverse(this);
+    }
+    --mScopeDepth;
+    return false;
+}