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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_SWIZZLE
- #define SKSL_SWIZZLE
- #include "src/sksl/SkSLContext.h"
- #include "src/sksl/SkSLIRGenerator.h"
- #include "src/sksl/SkSLUtil.h"
- #include "src/sksl/ir/SkSLConstructor.h"
- #include "src/sksl/ir/SkSLExpression.h"
- namespace SkSL {
- // represents a swizzle component of constant 0, as in x.rgb0
- const int SKSL_SWIZZLE_0 = -2;
- // represents a swizzle component of constant 1, as in x.rgb1
- const int SKSL_SWIZZLE_1 = -1;
- /**
- * Given a type and a swizzle component count, returns the type that will result from swizzling. For
- * instance, swizzling a float3 with two components will result in a float2. It is possible to
- * swizzle with more components than the source vector, as in 'float2(1).xxxx'.
- */
- static const Type& get_type(const Context& context, Expression& value, size_t count) {
- const Type& base = value.fType.componentType();
- if (count == 1) {
- return base;
- }
- if (base == *context.fFloat_Type) {
- switch (count) {
- case 2: return *context.fFloat2_Type;
- case 3: return *context.fFloat3_Type;
- case 4: return *context.fFloat4_Type;
- }
- } else if (base == *context.fHalf_Type) {
- switch (count) {
- case 2: return *context.fHalf2_Type;
- case 3: return *context.fHalf3_Type;
- case 4: return *context.fHalf4_Type;
- }
- } else if (base == *context.fDouble_Type) {
- switch (count) {
- case 2: return *context.fDouble2_Type;
- case 3: return *context.fDouble3_Type;
- case 4: return *context.fDouble4_Type;
- }
- } else if (base == *context.fInt_Type) {
- switch (count) {
- case 2: return *context.fInt2_Type;
- case 3: return *context.fInt3_Type;
- case 4: return *context.fInt4_Type;
- }
- } else if (base == *context.fShort_Type) {
- switch (count) {
- case 2: return *context.fShort2_Type;
- case 3: return *context.fShort3_Type;
- case 4: return *context.fShort4_Type;
- }
- } else if (base == *context.fByte_Type) {
- switch (count) {
- case 2: return *context.fByte2_Type;
- case 3: return *context.fByte3_Type;
- case 4: return *context.fByte4_Type;
- }
- } else if (base == *context.fUInt_Type) {
- switch (count) {
- case 2: return *context.fUInt2_Type;
- case 3: return *context.fUInt3_Type;
- case 4: return *context.fUInt4_Type;
- }
- } else if (base == *context.fUShort_Type) {
- switch (count) {
- case 2: return *context.fUShort2_Type;
- case 3: return *context.fUShort3_Type;
- case 4: return *context.fUShort4_Type;
- }
- } else if (base == *context.fUByte_Type) {
- switch (count) {
- case 2: return *context.fUByte2_Type;
- case 3: return *context.fUByte3_Type;
- case 4: return *context.fUByte4_Type;
- }
- } else if (base == *context.fBool_Type) {
- switch (count) {
- case 2: return *context.fBool2_Type;
- case 3: return *context.fBool3_Type;
- case 4: return *context.fBool4_Type;
- }
- }
- ABORT("cannot swizzle %s\n", value.description().c_str());
- }
- /**
- * Represents a vector swizzle operation such as 'float2(1, 2, 3).zyx'.
- */
- struct Swizzle : public Expression {
- Swizzle(const Context& context, std::unique_ptr<Expression> base, std::vector<int> components)
- : INHERITED(base->fOffset, kSwizzle_Kind, get_type(context, *base, components.size()))
- , fBase(std::move(base))
- , fComponents(std::move(components)) {
- SkASSERT(fComponents.size() >= 1 && fComponents.size() <= 4);
- }
- std::unique_ptr<Expression> constantPropagate(const IRGenerator& irGenerator,
- const DefinitionMap& definitions) override {
- if (fBase->fKind == Expression::kConstructor_Kind && fBase->isConstant()) {
- // we're swizzling a constant vector, e.g. float4(1).x. Simplify it.
- SkASSERT(fBase->fKind == Expression::kConstructor_Kind);
- if (fType.isInteger()) {
- SkASSERT(fComponents.size() == 1);
- int64_t value = ((Constructor&) *fBase).getIVecComponent(fComponents[0]);
- return std::unique_ptr<Expression>(new IntLiteral(irGenerator.fContext,
- -1,
- value));
- } else if (fType.isFloat()) {
- SkASSERT(fComponents.size() == 1);
- double value = ((Constructor&) *fBase).getFVecComponent(fComponents[0]);
- return std::unique_ptr<Expression>(new FloatLiteral(irGenerator.fContext,
- -1,
- value));
- }
- }
- return nullptr;
- }
- bool hasSideEffects() const override {
- return fBase->hasSideEffects();
- }
- std::unique_ptr<Expression> clone() const override {
- return std::unique_ptr<Expression>(new Swizzle(fType, fBase->clone(), fComponents));
- }
- String description() const override {
- String result = fBase->description() + ".";
- for (int x : fComponents) {
- result += "01xyzw"[x + 2];
- }
- return result;
- }
- std::unique_ptr<Expression> fBase;
- const std::vector<int> fComponents;
- typedef Expression INHERITED;
- private:
- Swizzle(const Type& type, std::unique_ptr<Expression> base, std::vector<int> components)
- : INHERITED(base->fOffset, kSwizzle_Kind, type)
- , fBase(std::move(base))
- , fComponents(std::move(components)) {
- SkASSERT(fComponents.size() >= 1 && fComponents.size() <= 4);
- }
- };
- } // namespace
- #endif
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