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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_INTERFACEBLOCK
#define SKSL_INTERFACEBLOCK
#include "include/core/SkTypes.h"
#include "include/private/SkSLIRNode.h"
#include "include/private/SkSLProgramElement.h"
#include "include/sksl/SkSLPosition.h"
#include "src/sksl/ir/SkSLType.h"
#include "src/sksl/ir/SkSLVariable.h"
#include <memory>
#include <optional>
#include <string>
#include <string_view>
#include <utility>
namespace SkSL {
class Context;
class SymbolTable;
/**
* An interface block, as in:
*
* out sk_PerVertex {
* layout(builtin=0) float4 sk_Position;
* layout(builtin=1) float sk_PointSize;
* };
*
* At the IR level, this is represented by a single variable of struct type.
*/
class InterfaceBlock final : public ProgramElement {
public:
inline static constexpr Kind kIRNodeKind = Kind::kInterfaceBlock;
InterfaceBlock(Position pos,
Variable* var,
std::shared_ptr<SymbolTable> typeOwner)
: INHERITED(pos, kIRNodeKind)
, fVariable(var)
, fTypeOwner(std::move(typeOwner)) {
SkASSERT(fVariable->type().componentType().isInterfaceBlock());
fVariable->setInterfaceBlock(this);
}
~InterfaceBlock() override;
// Returns an InterfaceBlock; errors are reported to the ErrorReporter.
// The caller is responsible for adding the InterfaceBlock to the program elements.
// The program's RTAdjustData will be updated if the InterfaceBlock contains sk_RTAdjust.
// The passed-in symbol table will be updated with a reference to the interface block variable
// (if it is named) or each of the interface block fields (if it is anonymous).
static std::unique_ptr<InterfaceBlock> Convert(const Context& context,
Position pos,
Variable* variable,
std::shared_ptr<SymbolTable> symbols);
// Returns an InterfaceBlock; errors are reported via SkASSERT.
// The caller is responsible for adding the InterfaceBlock to the program elements.
// If the InterfaceBlock contains sk_RTAdjust, the caller is responsible for passing its field
// index in `rtAdjustIndex`.
// The passed-in symbol table will be updated with a reference to the interface block variable
// (if it is named) or each of the interface block fields (if it is anonymous).
static std::unique_ptr<InterfaceBlock> Make(const Context& context,
Position pos,
Variable* variable,
std::optional<int> rtAdjustIndex,
std::shared_ptr<SymbolTable> symbols);
Variable* var() const {
return fVariable;
}
void detachDeadVariable() {
fVariable = nullptr;
}
std::string_view typeName() const {
return fVariable->type().componentType().name();
}
std::string_view instanceName() const {
return fVariable->name();
}
const std::shared_ptr<SymbolTable>& typeOwner() const {
return fTypeOwner;
}
int arraySize() const {
return fVariable->type().isArray() ? fVariable->type().columns() : 0;
}
std::unique_ptr<ProgramElement> clone() const override;
std::string description() const override;
private:
Variable* fVariable;
std::shared_ptr<SymbolTable> fTypeOwner;
using INHERITED = ProgramElement;
};
} // namespace SkSL
#endif
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