//
// 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_OUTPUTHLSL_H_
#define COMPILER_OUTPUTHLSL_H_

#include <list>
#include <set>
#include <map>

#include "angle_gl.h"
#include "compiler/translator/intermediate.h"
#include "compiler/translator/ParseContext.h"
#include "common/shadervars.h"

namespace sh
{
class UnfoldShortCircuit;
class StructureHLSL;
class UniformHLSL;

typedef std::map<TString, TIntermSymbol*> ReferencedSymbols;

class OutputHLSL : public TIntermTraverser
{
  public:
    OutputHLSL(TParseContext &context, const ShBuiltInResources& resources, ShShaderOutput outputType);
    ~OutputHLSL();

    void output();

    TInfoSinkBase &getBodyStream();
    const std::vector<sh::Uniform> &getUniforms();
    const std::vector<sh::InterfaceBlock> &getInterfaceBlocks() const;
    const std::vector<sh::Attribute> &getOutputVariables() const;
    const std::vector<sh::Attribute> &getAttributes() const;
    const std::vector<sh::Varying> &getVaryings() const;

    const std::map<std::string, unsigned int> &getInterfaceBlockRegisterMap() const;

    static TString initializer(const TType &type);

  protected:
    void header();

    // Visit AST nodes and output their code to the body stream
    void visitSymbol(TIntermSymbol*);
    void visitRaw(TIntermRaw*);
    void visitConstantUnion(TIntermConstantUnion*);
    bool visitBinary(Visit visit, TIntermBinary*);
    bool visitUnary(Visit visit, TIntermUnary*);
    bool visitSelection(Visit visit, TIntermSelection*);
    bool visitAggregate(Visit visit, TIntermAggregate*);
    bool visitLoop(Visit visit, TIntermLoop*);
    bool visitBranch(Visit visit, TIntermBranch*);

    void traverseStatements(TIntermNode *node);
    bool isSingleStatement(TIntermNode *node);
    bool handleExcessiveLoop(TIntermLoop *node);
    void outputTriplet(Visit visit, const TString &preString, const TString &inString, const TString &postString);
    void outputLineDirective(int line);
    TString argumentString(const TIntermSymbol *symbol);
    int vectorSize(const TType &type) const;

    void outputConstructor(Visit visit, const TType &type, const TString &name, const TIntermSequence *parameters);
    const ConstantUnion *writeConstantUnion(const TType &type, const ConstantUnion *constUnion);

    TParseContext &mContext;
    const ShShaderOutput mOutputType;
    UnfoldShortCircuit *mUnfoldShortCircuit;
    bool mInsideFunction;

    // Output streams
    TInfoSinkBase mHeader;
    TInfoSinkBase mBody;
    TInfoSinkBase mFooter;

    ReferencedSymbols mReferencedUniforms;
    ReferencedSymbols mReferencedInterfaceBlocks;
    ReferencedSymbols mReferencedAttributes;
    ReferencedSymbols mReferencedVaryings;
    ReferencedSymbols mReferencedOutputVariables;

    StructureHLSL *mStructureHLSL;
    UniformHLSL *mUniformHLSL;

    struct TextureFunction
    {
        enum Method
        {
            IMPLICIT,   // Mipmap LOD determined implicitly (standard lookup)
            BIAS,
            LOD,
            LOD0,
            LOD0BIAS,
            SIZE,   // textureSize()
            FETCH,
            GRAD
        };

        TBasicType sampler;
        int coords;
        bool proj;
        bool offset;
        Method method;

        TString name() const;

        bool operator<(const TextureFunction &rhs) const;
    };

    typedef std::set<TextureFunction> TextureFunctionSet;

    // Parameters determining what goes in the header output
    TextureFunctionSet mUsesTexture;
    bool mUsesFragColor;
    bool mUsesFragData;
    bool mUsesDepthRange;
    bool mUsesFragCoord;
    bool mUsesPointCoord;
    bool mUsesFrontFacing;
    bool mUsesPointSize;
    bool mUsesFragDepth;
    bool mUsesXor;
    bool mUsesMod1;
    bool mUsesMod2v;
    bool mUsesMod2f;
    bool mUsesMod3v;
    bool mUsesMod3f;
    bool mUsesMod4v;
    bool mUsesMod4f;
    bool mUsesFaceforward1;
    bool mUsesFaceforward2;
    bool mUsesFaceforward3;
    bool mUsesFaceforward4;
    bool mUsesAtan2_1;
    bool mUsesAtan2_2;
    bool mUsesAtan2_3;
    bool mUsesAtan2_4;
    bool mUsesDiscardRewriting;
    bool mUsesNestedBreak;

    int mNumRenderTargets;

    int mUniqueIndex;   // For creating unique names

    bool mContainsLoopDiscontinuity;
    bool mOutputLod0Function;
    bool mInsideDiscontinuousLoop;
    int mNestedLoopDepth;

    TIntermSymbol *mExcessiveLoopIndex;

    void declareVaryingToList(const TType &type, TQualifier baseTypeQualifier, const TString &name, std::vector<sh::Varying>& fieldsOut);

    TString structInitializerString(int indent, const TStructure &structure, const TString &rhsStructName);

    std::vector<sh::Attribute> mActiveOutputVariables;
    std::vector<sh::Attribute> mActiveAttributes;
    std::vector<sh::Varying> mActiveVaryings;
    std::map<TIntermTyped*, TString> mFlaggedStructMappedNames;
    std::map<TIntermTyped*, TString> mFlaggedStructOriginalNames;

    void makeFlaggedStructMaps(const std::vector<TIntermTyped *> &flaggedStructs);
};

}

#endif   // COMPILER_OUTPUTHLSL_H_
