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- /*
- * Copyright 2016 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #ifndef SKSL_INDEX
- #define SKSL_INDEX
- #include "src/sksl/SkSLContext.h"
- #include "src/sksl/SkSLUtil.h"
- #include "src/sksl/ir/SkSLExpression.h"
- namespace SkSL {
- /**
- * Given a type, returns the type that will result from extracting an array value from it.
- */
- static const Type& index_type(const Context& context, const Type& type) {
- if (type.kind() == Type::kMatrix_Kind) {
- if (type.componentType() == *context.fFloat_Type) {
- switch (type.rows()) {
- case 2: return *context.fFloat2_Type;
- case 3: return *context.fFloat3_Type;
- case 4: return *context.fFloat4_Type;
- default: SkASSERT(false);
- }
- } else if (type.componentType() == *context.fHalf_Type) {
- switch (type.rows()) {
- case 2: return *context.fHalf2_Type;
- case 3: return *context.fHalf3_Type;
- case 4: return *context.fHalf4_Type;
- default: SkASSERT(false);
- }
- } else {
- SkASSERT(type.componentType() == *context.fDouble_Type);
- switch (type.rows()) {
- case 2: return *context.fDouble2_Type;
- case 3: return *context.fDouble3_Type;
- case 4: return *context.fDouble4_Type;
- default: SkASSERT(false);
- }
- }
- }
- return type.componentType();
- }
- /**
- * An expression which extracts a value from an array or matrix, as in 'm[2]'.
- */
- struct IndexExpression : public Expression {
- IndexExpression(const Context& context, std::unique_ptr<Expression> base,
- std::unique_ptr<Expression> index)
- : INHERITED(base->fOffset, kIndex_Kind, index_type(context, base->fType))
- , fBase(std::move(base))
- , fIndex(std::move(index)) {
- SkASSERT(fIndex->fType == *context.fInt_Type || fIndex->fType == *context.fUInt_Type);
- }
- bool hasSideEffects() const override {
- return fBase->hasSideEffects() || fIndex->hasSideEffects();
- }
- std::unique_ptr<Expression> clone() const override {
- return std::unique_ptr<Expression>(new IndexExpression(fBase->clone(), fIndex->clone(),
- &fType));
- }
- String description() const override {
- return fBase->description() + "[" + fIndex->description() + "]";
- }
- std::unique_ptr<Expression> fBase;
- std::unique_ptr<Expression> fIndex;
- typedef Expression INHERITED;
- private:
- IndexExpression(std::unique_ptr<Expression> base, std::unique_ptr<Expression> index,
- const Type* type)
- : INHERITED(base->fOffset, kIndex_Kind, *type)
- , fBase(std::move(base))
- , fIndex(std::move(index)) {}
- };
- } // namespace
- #endif
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