1//
2// Copyright (c) 2002-2014 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_EMULATE_PRECISION_H_
8#define COMPILER_TRANSLATOR_TREEOPS_EMULATE_PRECISION_H_
9
10#include "GLSLANG/ShaderLang.h"
11#include "common/angleutils.h"
12#include "compiler/translator/Compiler.h"
13#include "compiler/translator/InfoSink.h"
14#include "compiler/translator/tree_util/IntermTraverse.h"
15
16// This class gathers all compound assignments from the AST and can then write
17// the functions required for their precision emulation. This way there is no
18// need to write a huge number of variations of the emulated compound assignment
19// to every translated shader with emulation enabled.
20
21namespace sh
22{
23
24class EmulatePrecision : public TLValueTrackingTraverser
25{
26 public:
27 EmulatePrecision(TSymbolTable *symbolTable);
28
29 void visitSymbol(TIntermSymbol *node) override;
30 bool visitBinary(Visit visit, TIntermBinary *node) override;
31 bool visitUnary(Visit visit, TIntermUnary *node) override;
32 bool visitAggregate(Visit visit, TIntermAggregate *node) override;
33 bool visitInvariantDeclaration(Visit visit, TIntermInvariantDeclaration *node) override;
34 bool visitDeclaration(Visit visit, TIntermDeclaration *node) override;
35
36 void writeEmulationHelpers(TInfoSinkBase &sink,
37 const int shaderVersion,
38 const ShShaderOutput outputLanguage);
39
40 static bool SupportedInLanguage(const ShShaderOutput outputLanguage);
41
42 private:
43 struct TypePair
44 {
45 TypePair(const char *l, const char *r) : lType(l), rType(r) {}
46
47 const char *lType;
48 const char *rType;
49 };
50
51 struct TypePairComparator
52 {
53 bool operator()(const TypePair &l, const TypePair &r) const
54 {
55 if (l.lType == r.lType)
56 return l.rType < r.rType;
57 return l.lType < r.lType;
58 }
59 };
60
61 const TFunction *getInternalFunction(const ImmutableString &functionName,
62 const TType &returnType,
63 TIntermSequence *arguments,
64 const TVector<const TVariable *> &parameters,
65 bool knownToNotHaveSideEffects);
66 TIntermAggregate *createRoundingFunctionCallNode(TIntermTyped *roundedChild);
67 TIntermAggregate *createCompoundAssignmentFunctionCallNode(TIntermTyped *left,
68 TIntermTyped *right,
69 const char *opNameStr);
70
71 typedef std::set<TypePair, TypePairComparator> EmulationSet;
72 EmulationSet mEmulateCompoundAdd;
73 EmulationSet mEmulateCompoundSub;
74 EmulationSet mEmulateCompoundMul;
75 EmulationSet mEmulateCompoundDiv;
76
77 // Map from mangled name to function.
78 TMap<ImmutableString, const TFunction *> mInternalFunctions;
79
80 bool mDeclaringVariables;
81};
82
83} // namespace sh
84
85#endif // COMPILER_TRANSLATOR_TREEOPS_EMULATE_PRECISION_H_
86