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-rwxr-xr-xgfx/angle/src/compiler/translator/InitializeVariables.cpp130
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