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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.
//
#ifndef COMPILER_TRANSLATOR_TREEOPS_INITIALIZEVARIABLES_H_
#define COMPILER_TRANSLATOR_TREEOPS_INITIALIZEVARIABLES_H_
#include <GLSLANG/ShaderLang.h>
#include "compiler/translator/ExtensionBehavior.h"
#include "compiler/translator/IntermNode.h"
namespace sh
{
class TCompiler;
class TSymbolTable;
typedef std::vector<sh::ShaderVariable> InitVariableList;
// For all of the functions below: If canUseLoopsToInitialize is set, for loops are used instead of
// a large number of initializers where it can make sense, such as for initializing large arrays.
// Populate a sequence of assignment operations to initialize "initializedSymbol". initializedSymbol
// may be an array, struct or any combination of these, as long as it contains only basic types.
void CreateInitCode(const TIntermTyped *initializedSymbol,
bool canUseLoopsToInitialize,
bool highPrecisionSupported,
TIntermSequence *initCode,
TSymbolTable *symbolTable);
// Initialize all uninitialized local variables, so that undefined behavior is avoided.
[[nodiscard]] bool InitializeUninitializedLocals(TCompiler *compiler,
TIntermBlock *root,
int shaderVersion,
bool canUseLoopsToInitialize,
bool highPrecisionSupported,
TSymbolTable *symbolTable);
// This function can initialize all the types that CreateInitCode is able to initialize. All
// variables must be globals which can be found in the symbol table. For now it is used for the
// following two scenarios:
// 1. Initializing gl_Position;
// 2. Initializing output variables referred to in the shader source.
// Note: The type of each lvalue in an initializer is retrieved from the symbol table. gl_FragData
// requires special handling because the number of indices which can be initialized is determined by
// enabled extensions.
[[nodiscard]] bool InitializeVariables(TCompiler *compiler,
TIntermBlock *root,
const InitVariableList &vars,
TSymbolTable *symbolTable,
int shaderVersion,
const TExtensionBehavior &extensionBehavior,
bool canUseLoopsToInitialize,
bool highPrecisionSupported);
} // namespace sh
#endif // COMPILER_TRANSLATOR_TREEOPS_INITIALIZEVARIABLES_H_
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