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Side by Side Diff: src/sksl/ir/SkSLIndexExpression.h

Issue 1984363002: initial checkin of SkSL compiler (Closed) Base URL: https://skia.googlesource.com/skia@master
Patch Set: fixed CMake build Created 4 years, 5 months ago
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1 /*
2 * Copyright 2016 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 #ifndef SKSL_INDEX
9 #define SKSL_INDEX
10
11 #include "SkSLExpression.h"
12 #include "SkSLUtil.h"
13
14 namespace SkSL {
15
16 /**
17 * Given a type, returns the type that will result from extracting an array valu e from it.
18 */
19 static std::shared_ptr<Type> index_type(const Type& type) {
20 if (type.kind() == Type::kMatrix_Kind) {
21 if (type.componentType() == kFloat_Type) {
22 switch (type.columns()) {
23 case 2: return kVec2_Type;
24 case 3: return kVec3_Type;
25 case 4: return kVec4_Type;
26 default: ASSERT(false);
27 }
28 } else {
29 ASSERT(type.componentType() == kDouble_Type);
30 switch (type.columns()) {
31 case 2: return kDVec2_Type;
32 case 3: return kDVec3_Type;
33 case 4: return kDVec4_Type;
34 default: ASSERT(false);
35 }
36 }
37 }
38 return type.componentType();
39 }
40
41 /**
42 * An expression which extracts a value from an array or matrix, as in 'm[2]'.
43 */
44 struct IndexExpression : public Expression {
45 IndexExpression(std::unique_ptr<Expression> base, std::unique_ptr<Expression > index)
46 : INHERITED(base->fPosition, kIndex_Kind, index_type(*base->fType))
47 , fBase(std::move(base))
48 , fIndex(std::move(index)) {
49 ASSERT(fIndex->fType == kInt_Type);
50 }
51
52 std::string description() const override {
53 return fBase->description() + "[" + fIndex->description() + "]";
54 }
55
56 const std::unique_ptr<Expression> fBase;
57 const std::unique_ptr<Expression> fIndex;
58
59 typedef Expression INHERITED;
60 };
61
62 } // namespace
63
64 #endif
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