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// Copyright 2021 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef SRC_TINT_AST_INTERPOLATE_ATTRIBUTE_H_
#define SRC_TINT_AST_INTERPOLATE_ATTRIBUTE_H_
#include <ostream>
#include <string>
#include "src/tint/ast/attribute.h"
namespace tint::ast {
/// The interpolation type.
enum class InterpolationType { kPerspective, kLinear, kFlat };
/// The interpolation sampling.
enum class InterpolationSampling { kNone = -1, kCenter, kCentroid, kSample };
/// An interpolate attribute
class InterpolateAttribute final : public Castable<InterpolateAttribute, Attribute> {
public:
/// Create an interpolate attribute.
/// @param pid the identifier of the program that owns this node
/// @param nid the unique node identifier
/// @param src the source of this node
/// @param type the interpolation type
/// @param sampling the interpolation sampling
InterpolateAttribute(ProgramID pid,
NodeID nid,
const Source& src,
InterpolationType type,
InterpolationSampling sampling);
~InterpolateAttribute() override;
/// @returns the WGSL name for the attribute
std::string Name() const override;
/// Clones this node and all transitive child nodes using the `CloneContext`
/// `ctx`.
/// @param ctx the clone context
/// @return the newly cloned node
const InterpolateAttribute* Clone(CloneContext* ctx) const override;
/// The interpolation type
const InterpolationType type;
/// The interpolation sampling
const InterpolationSampling sampling;
};
/// @param out the std::ostream to write to
/// @param type the interpolation type
/// @return the std::ostream so calls can be chained
std::ostream& operator<<(std::ostream& out, InterpolationType type);
/// @param out the std::ostream to write to
/// @param sampling the interpolation sampling
/// @return the std::ostream so calls can be chained
std::ostream& operator<<(std::ostream& out, InterpolationSampling sampling);
} // namespace tint::ast
#endif // SRC_TINT_AST_INTERPOLATE_ATTRIBUTE_H_