1 /*
2 * Copyright 2017 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "src/sksl/ir/SkSLSetting.h"
9
10 #include "include/core/SkTypes.h"
11 #include "src/base/SkNoDestructor.h"
12 #include "src/core/SkTHash.h"
13 #include "src/sksl/SkSLBuiltinTypes.h"
14 #include "src/sksl/SkSLContext.h"
15 #include "src/sksl/SkSLErrorReporter.h"
16 #include "src/sksl/SkSLProgramSettings.h"
17 #include "src/sksl/SkSLUtil.h"
18 #include "src/sksl/ir/SkSLLiteral.h"
19
20 #include <initializer_list>
21
22 using namespace skia_private;
23
24 namespace SkSL {
25 namespace {
26
27 using CapsLookupTable = THashMap<std::string_view, Setting::CapsPtr>;
28
caps_lookup_table()29 static const CapsLookupTable& caps_lookup_table() {
30 // Create a lookup table that converts strings into the equivalent ShaderCaps member-pointers.
31 static SkNoDestructor<CapsLookupTable> sCapsLookupTable(CapsLookupTable{
32 CapsLookupTable::Pair("mustDoOpBetweenFloorAndAbs",
33 &ShaderCaps::fMustDoOpBetweenFloorAndAbs),
34 CapsLookupTable::Pair("mustGuardDivisionEvenAfterExplicitZeroCheck",
35 &ShaderCaps::fMustGuardDivisionEvenAfterExplicitZeroCheck),
36 CapsLookupTable::Pair("atan2ImplementedAsAtanYOverX",
37 &ShaderCaps::fAtan2ImplementedAsAtanYOverX),
38 CapsLookupTable::Pair("floatIs32Bits",
39 &ShaderCaps::fFloatIs32Bits),
40 CapsLookupTable::Pair("integerSupport",
41 &ShaderCaps::fIntegerSupport),
42 CapsLookupTable::Pair("builtinDeterminantSupport",
43 &ShaderCaps::fBuiltinDeterminantSupport),
44 CapsLookupTable::Pair("rewriteMatrixVectorMultiply",
45 &ShaderCaps::fRewriteMatrixVectorMultiply),
46 CapsLookupTable::Pair("PerlinNoiseRoundingFix",
47 &ShaderCaps::fPerlinNoiseRoundingFix),
48 });
49 return *sCapsLookupTable;
50 }
51
52 } // namespace
53
name() const54 std::string_view Setting::name() const {
55 for (const auto& [name, capsPtr] : caps_lookup_table()) {
56 if (capsPtr == fCapsPtr) {
57 return name;
58 }
59 }
60 SkUNREACHABLE;
61 }
62
Convert(const Context & context,Position pos,const std::string_view & name)63 std::unique_ptr<Expression> Setting::Convert(const Context& context,
64 Position pos,
65 const std::string_view& name) {
66 SkASSERT(context.fConfig);
67
68 if (!ProgramConfig::AllowsPrivateIdentifiers(context.fConfig->fKind)) {
69 context.fErrors->error(pos, "name 'sk_Caps' is reserved");
70 return nullptr;
71 }
72
73 const CapsPtr* capsPtr = caps_lookup_table().find(name);
74 if (!capsPtr) {
75 context.fErrors->error(pos, "unknown capability flag '" + std::string(name) + "'");
76 return nullptr;
77 }
78
79 return Setting::Make(context, pos, *capsPtr);
80 }
81
Make(const Context & context,Position pos,CapsPtr capsPtr)82 std::unique_ptr<Expression> Setting::Make(const Context& context, Position pos, CapsPtr capsPtr) {
83 SkASSERT(ProgramConfig::AllowsPrivateIdentifiers(context.fConfig->fKind));
84
85 return std::make_unique<Setting>(pos, capsPtr, context.fTypes.fBool.get());
86 }
87
toLiteral(const ShaderCaps & caps) const88 std::unique_ptr<Expression> Setting::toLiteral(const ShaderCaps& caps) const {
89 return Literal::MakeBool(fPosition, caps.*fCapsPtr, &this->type());
90 }
91
92 } // namespace SkSL
93