1 files changed, 130 insertions, 0 deletions
diff --git a/gfx/angle/src/compiler/translator/InitializeVariables.cpp b/gfx/angle/src/compiler/translator/InitializeVariables.cpp
new file mode 100755
index 000000000..dafea1bd6
--- /dev/null
+++ b/gfx/angle/src/compiler/translator/InitializeVariables.cpp
@@ -0,0 +1,130 @@
+//
+// Copyright (c) 2002-2013 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/InitializeVariables.h"
+
+#include "angle_gl.h"
+#include "common/debug.h"
+#include "compiler/translator/IntermNode.h"
+#include "compiler/translator/SymbolTable.h"
+#include "compiler/translator/util.h"
+
+namespace sh
+{
+
+namespace
+{
+
+class VariableInitializer : public TIntermTraverser
+{
+  public:
+    VariableInitializer(const InitVariableList &vars, const TSymbolTable &symbolTable)
+        : TIntermTraverser(true, false, false),
+          mVariables(vars),
+          mSymbolTable(symbolTable),
+          mCodeInserted(false)
+    {
+        ASSERT(mSymbolTable.atGlobalLevel());
+    }
+
+  protected:
+    bool visitBinary(Visit, TIntermBinary *node) override { return false; }
+    bool visitUnary(Visit, TIntermUnary *node) override { return false; }
+    bool visitIfElse(Visit, TIntermIfElse *node) override { return false; }
+    bool visitLoop(Visit, TIntermLoop *node) override { return false; }
+    bool visitBranch(Visit, TIntermBranch *node) override { return false; }
+    bool visitAggregate(Visit, TIntermAggregate *node) override { return false; }
+
+    bool visitFunctionDefinition(Visit visit, TIntermFunctionDefinition *node) override;
+
+  private:
+    void insertInitCode(TIntermSequence *sequence);
+
+    const InitVariableList &mVariables;
+    const TSymbolTable &mSymbolTable;
+    bool mCodeInserted;
+};
+
+// VariableInitializer implementation.
+
+bool VariableInitializer::visitFunctionDefinition(Visit visit, TIntermFunctionDefinition *node)
+{
+    // Function definition.
+    ASSERT(visit == PreVisit);
+    if (node->getFunctionSymbolInfo()->isMain())
+    {
+        TIntermBlock *body = node->getBody();
+        insertInitCode(body->getSequence());
+        mCodeInserted = true;
+    }
+    return false;
+}
+
+void VariableInitializer::insertInitCode(TIntermSequence *sequence)
+{
+    for (const auto &var : mVariables)
+    {
+        TString name = TString(var.name.c_str());
+
+        if (var.isArray())
+        {
+            // Assign the array elements one by one to keep the AST compatible with ESSL 1.00 which
+            // doesn't have array assignment.
+            size_t pos = name.find_last_of('[');
+            if (pos != TString::npos)
+            {
+                name = name.substr(0, pos);
+            }
+            TType elementType = sh::GetShaderVariableBasicType(var);
+            TType arrayType   = elementType;
+            arrayType.setArraySize(var.elementCount());
+
+            for (unsigned int i = 0; i < var.arraySize; ++i)
+            {
+                TIntermSymbol *arraySymbol = new TIntermSymbol(0, name, arrayType);
+                TIntermBinary *element     = new TIntermBinary(EOpIndexDirect, arraySymbol,
+                                                           TIntermTyped::CreateIndexNode(i));
+
+                TIntermTyped *zero        = TIntermTyped::CreateZero(elementType);
+                TIntermBinary *assignment = new TIntermBinary(EOpAssign, element, zero);
+
+                sequence->insert(sequence->begin(), assignment);
+            }
+        }
+        else if (var.isStruct())
+        {
+            TVariable *structInfo = reinterpret_cast<TVariable *>(mSymbolTable.findGlobal(name));
+            ASSERT(structInfo);
+
+            TIntermSymbol *symbol = new TIntermSymbol(0, name, structInfo->getType());
+            TIntermTyped *zero    = TIntermTyped::CreateZero(structInfo->getType());
+
+            TIntermBinary *assign = new TIntermBinary(EOpAssign, symbol, zero);
+            sequence->insert(sequence->begin(), assign);
+        }
+        else
+        {
+            TType type            = sh::GetShaderVariableBasicType(var);
+            TIntermSymbol *symbol = new TIntermSymbol(0, name, type);
+            TIntermTyped *zero    = TIntermTyped::CreateZero(type);
+
+            TIntermBinary *assign = new TIntermBinary(EOpAssign, symbol, zero);
+            sequence->insert(sequence->begin(), assign);
+        }
+    }
+}
+
+}  // namespace anonymous
+
+void InitializeVariables(TIntermNode *root,
+                         const InitVariableList &vars,
+                         const TSymbolTable &symbolTable)
+{
+    VariableInitializer initializer(vars, symbolTable);
+    root->traverse(&initializer);
+}
+
+}  // namespace sh