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// Copyright 2023 The Dawn & Tint Authors
//
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// 1. Redistributions of source code must retain the above copyright notice, this
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#ifndef SRC_TINT_LANG_CORE_IR_VAR_H_
#define SRC_TINT_LANG_CORE_IR_VAR_H_
#include <string>
#include "src/tint/api/common/binding_point.h"
#include "src/tint/lang/core/builtin_value.h"
#include "src/tint/lang/core/interpolation.h"
#include "src/tint/lang/core/ir/operand_instruction.h"
#include "src/tint/utils/rtti/castable.h"
namespace tint::core::ir {
/// Attributes that can be applied to a variable that will be used for shader IO.
struct IOAttributes {
/// The value of a `@location` attribute.
std::optional<uint32_t> location;
/// The value of a `@blend_src` attribute.
std::optional<uint32_t> blend_src;
/// The value of a `@builtin` attribute.
std::optional<core::BuiltinValue> builtin;
/// The values of a `@interpolate` attribute.
std::optional<core::Interpolation> interpolation;
/// True if the variable is annotated with `@invariant`.
bool invariant = false;
};
/// A var instruction in the IR.
class Var final : public Castable<Var, OperandInstruction<1, 1>> {
public:
/// The offset in Operands() for the initializer
static constexpr size_t kInitializerOperandOffset = 0;
/// Constructor (no results, no operands)
Var();
/// Constructor
/// @param result the result value
explicit Var(InstructionResult* result);
~Var() override;
/// @copydoc Instruction::Clone()
Var* Clone(CloneContext& ctx) override;
/// Sets the var initializer
/// @param initializer the initializer
void SetInitializer(Value* initializer);
/// @returns the initializer
Value* Initializer() { return operands_[kInitializerOperandOffset]; }
/// @returns the initializer
const Value* Initializer() const { return operands_[kInitializerOperandOffset]; }
/// Sets the binding point
/// @param group the group
/// @param binding the binding
void SetBindingPoint(uint32_t group, uint32_t binding) { binding_point_ = {group, binding}; }
/// @returns the binding points if `Attributes` contains `kBindingPoint`
std::optional<struct BindingPoint> BindingPoint() const { return binding_point_; }
/// Sets the IO attributes
/// @param attrs the attributes
void SetAttributes(const IOAttributes& attrs) { attributes_ = attrs; }
/// @returns the IO attributes
const IOAttributes& Attributes() const { return attributes_; }
/// Destroys this instruction along with any assignment instructions, if the var is never read.
void DestroyIfOnlyAssigned();
/// @returns the friendly name for the instruction
std::string FriendlyName() const override { return "var"; }
private:
std::optional<struct BindingPoint> binding_point_;
IOAttributes attributes_;
};
} // namespace tint::core::ir
#endif // SRC_TINT_LANG_CORE_IR_VAR_H_