//
// Copyright 2020 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.
//
// SpecializationConst.h: Add code to generate AST node for specialization constant.
//

#ifndef COMPILER_TRANSLATOR_TREEUTIL_SPECIALIZATIONCONSTANT_H_
#define COMPILER_TRANSLATOR_TREEUTIL_SPECIALIZATIONCONSTANT_H_

#include "common/angleutils.h"
#include "compiler/translator/Compiler.h"
#include "compiler/translator/SymbolTable.h"

class TIntermBlock;
class TIntermTyped;
class TIntermSymbol;
class TVariable;

namespace sh
{

class SpecConst
{
  public:
    SpecConst(TSymbolTable *symbolTable, const ShCompileOptions &compileOptions, GLenum shaderType);
    virtual ~SpecConst();

    // Flip/rotation
    // Returns a boolean: should X and Y be swapped?
    TIntermTyped *getSwapXY();

    // Dither emulation
    TIntermTyped *getDither();

    void declareSpecConsts(TIntermBlock *root);
    SpecConstUsageBits getSpecConstUsageBits() const { return mUsageBits; }

  private:
    TIntermSymbol *getRotation();

    // If unsupported, this should be set to null.
    TSymbolTable *mSymbolTable;
    const ShCompileOptions &mCompileOptions;

    TVariable *mSurfaceRotationVar;
    TVariable *mDitherVar;

    // Bit is set if YFlip or Rotation has been used
    SpecConstUsageBits mUsageBits;
};
}  // namespace sh

#endif  // COMPILER_TRANSLATOR_TREEUTIL_SPECIALIZATIONCONSTANT_H_