1 // 2 // Copyright 2002 The ANGLE Project Authors. All rights reserved. 3 // Use of this source code is governed by a BSD-style license that can be 4 // found in the LICENSE file. 5 // 6 7 #ifndef COMPILER_TRANSLATOR_TREEOPS_INITIALIZEVARIABLES_H_ 8 #define COMPILER_TRANSLATOR_TREEOPS_INITIALIZEVARIABLES_H_ 9 10 #include <GLSLANG/ShaderLang.h> 11 12 #include "compiler/translator/ExtensionBehavior.h" 13 #include "compiler/translator/IntermNode.h" 14 15 namespace sh 16 { 17 class TSymbolTable; 18 19 typedef std::vector<sh::ShaderVariable> InitVariableList; 20 21 // For all of the functions below: If canUseLoopsToInitialize is set, for loops are used instead of 22 // a large number of initializers where it can make sense, such as for initializing large arrays. 23 24 // Return a sequence of assignment operations to initialize "initializedSymbol". initializedSymbol 25 // may be an array, struct or any combination of these, as long as it contains only basic types. 26 TIntermSequence *CreateInitCode(const TIntermTyped *initializedSymbol, 27 bool canUseLoopsToInitialize, 28 bool highPrecisionSupported, 29 TSymbolTable *symbolTable); 30 31 // Initialize all uninitialized local variables, so that undefined behavior is avoided. 32 void InitializeUninitializedLocals(TIntermBlock *root, 33 int shaderVersion, 34 bool canUseLoopsToInitialize, 35 bool highPrecisionSupported, 36 TSymbolTable *symbolTable); 37 38 // This function can initialize all the types that CreateInitCode is able to initialize. All 39 // variables must be globals which can be found in the symbol table. For now it is used for the 40 // following two scenarios: 41 // 1. Initializing gl_Position; 42 // 2. Initializing output variables referred to in the shader source. 43 // Note: The type of each lvalue in an initializer is retrieved from the symbol table. gl_FragData 44 // requires special handling because the number of indices which can be initialized is determined by 45 // enabled extensions. 46 void InitializeVariables(TIntermBlock *root, 47 const InitVariableList &vars, 48 TSymbolTable *symbolTable, 49 int shaderVersion, 50 const TExtensionBehavior &extensionBehavior, 51 bool canUseLoopsToInitialize, 52 bool highPrecisionSupported); 53 54 } // namespace sh 55 56 #endif // COMPILER_TRANSLATOR_TREEOPS_INITIALIZEVARIABLES_H_ 57