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-rwxr-xr-xgfx/angle/src/compiler/translator/LoopInfo.h85
1 files changed, 85 insertions, 0 deletions
diff --git a/gfx/angle/src/compiler/translator/LoopInfo.h b/gfx/angle/src/compiler/translator/LoopInfo.h
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+++ b/gfx/angle/src/compiler/translator/LoopInfo.h
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+//
+// 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.
+//
+
+#ifndef COMPILER_TRANSLATOR_LOOPINFO_H_
+#define COMPILER_TRANSLATOR_LOOPINFO_H_
+
+#include "compiler/translator/IntermNode.h"
+
+namespace sh
+{
+
+class TLoopIndexInfo
+{
+ public:
+ TLoopIndexInfo();
+
+ // If type is EbtInt, fill all fields of the structure with info
+ // extracted from a loop node.
+ // If type is not EbtInt, only fill id and type.
+ void fillInfo(TIntermLoop *node);
+
+ int getId() const { return mId; }
+ void setId(int id) { mId = id; }
+ TBasicType getType() const { return mType; }
+ void setType(TBasicType type) { mType = type; }
+ int getCurrentValue() const { return mCurrentValue; }
+
+ void step() { mCurrentValue += mIncrementValue; }
+
+ // Check if the current value satisfies the loop condition.
+ bool satisfiesLoopCondition() const;
+
+ private:
+ int mId;
+ TBasicType mType; // Either EbtInt or EbtFloat
+
+ // Below fields are only valid if the index's type is int.
+ int mInitValue;
+ int mStopValue;
+ int mIncrementValue;
+ TOperator mOp;
+ int mCurrentValue;
+};
+
+struct TLoopInfo
+{
+ TLoopIndexInfo index;
+ TIntermLoop *loop;
+
+ TLoopInfo();
+ TLoopInfo(TIntermLoop *node);
+};
+
+class TLoopStack : public TVector<TLoopInfo>
+{
+ public:
+ // Search loop stack for a loop whose index matches the input symbol.
+ TIntermLoop *findLoop(TIntermSymbol *symbol);
+
+ // Find the loop index info in the loop stack by the input symbol.
+ TLoopIndexInfo *getIndexInfo(TIntermSymbol *symbol);
+
+ // Update the currentValue for the next loop iteration.
+ void step();
+
+ // Return false if loop condition is no longer satisfied.
+ bool satisfiesLoopCondition();
+
+ // Check if the symbol is the index of a loop that's unrolled.
+ bool needsToReplaceSymbolWithValue(TIntermSymbol *symbol);
+
+ // Return the current value of a given loop index symbol.
+ int getLoopIndexValue(TIntermSymbol *symbol);
+
+ void push(TIntermLoop *info);
+ void pop();
+};
+
+} // namespace sh
+
+#endif // COMPILER_TRANSLATOR_LOOPINFO_H_
+