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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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