1 //
2 // Copyright 2016 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 // DeferGlobalInitializers is an AST traverser that moves global initializers into a separate
7 // function that is called in the beginning of main(). This enables initialization of globals with
8 // uniforms or non-constant globals, as allowed by the WebGL spec. Some initializers referencing
9 // non-constants may need to be unfolded into if statements in HLSL - this kind of steps should be
10 // done after DeferGlobalInitializers is run. Note that it's important that the function definition
11 // is at the end of the shader, as some globals may be declared after main().
12 //
13 // It can also initialize all uninitialized globals.
14 //
15 
16 #ifndef COMPILER_TRANSLATOR_TREEOPS_DEFERGLOBALINITIALIZERS_H_
17 #define COMPILER_TRANSLATOR_TREEOPS_DEFERGLOBALINITIALIZERS_H_
18 
19 #include "common/angleutils.h"
20 
21 namespace sh
22 {
23 
24 class TCompiler;
25 class TIntermBlock;
26 class TSymbolTable;
27 
28 ANGLE_NO_DISCARD bool DeferGlobalInitializers(TCompiler *compiler,
29                                               TIntermBlock *root,
30                                               bool initializeUninitializedGlobals,
31                                               bool canUseLoopsToInitialize,
32                                               bool highPrecisionSupported,
33                                               TSymbolTable *symbolTable);
34 
35 }  // namespace sh
36 
37 #endif  // COMPILER_TRANSLATOR_TREEOPS_DEFERGLOBALINITIALIZERS_H_
38