//
// 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.
//

#ifndef COMPILER_TRANSLATOR_UTIL_H_
#define COMPILER_TRANSLATOR_UTIL_H_

#include <stack>

#include <GLSLANG/ShaderLang.h>
#include "angle_gl.h"

#include "compiler/translator/HashNames.h"
#include "compiler/translator/ImmutableString.h"
#include "compiler/translator/Operator_autogen.h"
#include "compiler/translator/Types.h"

// If overflow happens, clamp the value to UINT_MIN or UINT_MAX.
// Return false if overflow happens.
bool atoi_clamp(const char *str, unsigned int *value);

namespace sh
{

class TIntermBlock;
class TIntermDeclaration;
class TSymbolTable;
class TIntermTyped;

float NumericLexFloat32OutOfRangeToInfinity(const std::string &str, bool preserveDenorms);

// strtof_clamp is like strtof but
//   1. it forces C locale, i.e. forcing '.' as decimal point.
//   2. it sets the value to infinity if overflow happens.
//   3. str should be guaranteed to be in the valid format for a floating point number as defined
//      by the grammar in the ESSL 3.00.6 spec section 4.1.4.
// Return false if overflow happens.
bool strtof_clamp(const std::string &str, float *value, bool preserveDenorms);

GLenum GLVariableType(const TType &type);
GLenum GLVariablePrecision(const TType &type);
bool IsParam(TQualifier qualifier);
// Returns true if `out` or `inout` function parameter.
bool IsParamOut(TQualifier qualifier);
bool IsVaryingIn(TQualifier qualifier);
bool IsVaryingOut(TQualifier qualifier);
bool IsVarying(TQualifier qualifier);
bool IsMatrixGLType(GLenum type);
bool IsGeometryShaderInput(GLenum shaderType, TQualifier qualifier);
bool IsTessellationControlShaderInput(GLenum shaderType, TQualifier qualifier);
bool IsTessellationControlShaderOutput(GLenum shaderType, TQualifier qualifier);
bool IsTessellationEvaluationShaderInput(GLenum shaderType, TQualifier qualifier);
InterpolationType GetInterpolationType(TQualifier qualifier);
InterpolationType GetFieldInterpolationType(TQualifier qualifier);

// Returns array brackets including size with outermost array size first, as specified in GLSL ES
// 3.10 section 4.1.9.
ImmutableString ArrayString(const TType &type);

ImmutableString GetTypeName(const TType &type,
                            char prefix,
                            ShHashFunction64 hashFunction,
                            NameMap *nameMap);

TType GetShaderVariableBasicType(const sh::ShaderVariable &var);

void DeclareGlobalVariable(TIntermBlock *root, const TVariable *variable);

bool IsBuiltinOutputVariable(TQualifier qualifier);
bool IsBuiltinFragmentInputVariable(TQualifier qualifier);
bool CanBeInvariantESSL1(TQualifier qualifier);
bool CanBeInvariantESSL3OrGreater(TQualifier qualifier);
bool IsShaderOutput(TQualifier qualifier);
bool IsFragmentOutput(TQualifier qualifier);
bool IsOutputNULL(ShShaderOutput output);
bool IsOutputESSL(ShShaderOutput output);
bool IsOutputGLSL(ShShaderOutput output);
bool IsOutputHLSL(ShShaderOutput output);
bool IsOutputSPIRV(ShShaderOutput output);
bool IsOutputMSL(ShShaderOutput output);
bool IsOutputWGSL(ShShaderOutput output);

bool IsInShaderStorageBlock(TIntermTyped *node);

GLenum GetImageInternalFormatType(TLayoutImageInternalFormat iifq);
// ESSL 1.00 shaders nest function body scope within function parameter scope
bool IsSpecWithFunctionBodyNewScope(ShShaderSpec shaderSpec, int shaderVersion);

// Whether the given basic type requires precision.
bool IsPrecisionApplicableToType(TBasicType type);

// Whether this is the name of a built-in that can be redeclared by the shader.
bool IsRedeclarableBuiltIn(const ImmutableString &name);

size_t FindFieldIndex(const TFieldList &fieldList, const char *fieldName);

// A convenience view of a TIntermDeclaration node's children.
struct Declaration
{
    TIntermSymbol &symbol;
    TIntermTyped *initExpr;  // Non-null iff declaration is initialized.
};

// Returns a `Declaration` view of the given node, for declarator `index` of
// the declarations in `declNode`.
Declaration ViewDeclaration(TIntermDeclaration &declNode, uint32_t index = 0);

// Returns true if op indexes an array, struct, or interface block.
bool IsIndexOp(TOperator op);

}  // namespace sh

#endif  // COMPILER_TRANSLATOR_UTIL_H_
