ASTMetadataHLSL.h - mozsearch

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//

// Copyright 2002 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.

//

// Defines analyses of the AST needed for HLSL generation

#ifndef COMPILER_TRANSLATOR_ASTMETADATAHLSL_H_

#define COMPILER_TRANSLATOR_ASTMETADATAHLSL_H_

#include <set>

#include <vector>

namespace sh

class CallDAG;

class TIntermNode;

class TIntermIfElse;

class TIntermLoop;

struct ASTMetadataHLSL

    ASTMetadataHLSL()

        : mUsesGradient(false),

          mCalledInDiscontinuousLoop(false),

          mHasGradientLoopInCallGraph(false),

          mNeedsLod0(false)

{}

    // Here "something uses a gradient" means here that it either contains a

    // gradient operation, or a call to a function that uses a gradient.

    bool hasGradientInCallGraph(TIntermLoop *node);

    bool hasGradientLoop(TIntermIfElse *node);

    // Does the function use a gradient.

    bool mUsesGradient;

    // Even if usesGradient is true, some control flow might not use a gradient

    // so we store the set of all gradient-using control flows.

    std::set<TIntermNode *> mControlFlowsContainingGradient;

    // Remember information about the discontinuous loops and which functions

    // are called in such loops.

    bool mCalledInDiscontinuousLoop;

    bool mHasGradientLoopInCallGraph;

    std::set<TIntermLoop *> mDiscontinuousLoops;

    std::set<TIntermIfElse *> mIfsContainingGradientLoop;

    // Will we need to generate a Lod0 version of the function.

    bool mNeedsLod0;

};

typedef std::vector<ASTMetadataHLSL> MetadataList;

// Return the AST analysis result, in the order defined by the call DAG

MetadataList CreateASTMetadataHLSL(TIntermNode *root, const CallDAG &callDag);

}  // namespace sh

#endif  // COMPILER_TRANSLATOR_ASTMETADATAHLSL_H_