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// Copyright 2022 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_IR_FUNCTION_H_
#define SRC_TINT_IR_FUNCTION_H_
#include <array>
#include <optional>
#include <utility>
#include "src/tint/ir/function_param.h"
#include "src/tint/ir/location.h"
#include "src/tint/ir/value.h"
#include "src/tint/type/type.h"
// Forward declarations
namespace tint::ir {
class Block;
class FunctionTerminator;
} // namespace tint::ir
namespace tint::ir {
/// An IR representation of a function
class Function : public utils::Castable<Function, Value> {
public:
/// The pipeline stage for an entry point
enum class PipelineStage {
/// Not a pipeline entry point
kUndefined,
/// Vertex
kCompute,
/// Fragment
kFragment,
/// Vertex
kVertex,
};
/// Builtin attached to return types
enum class ReturnBuiltin {
/// Builtin Position attribute
kPosition,
/// Builtin FragDepth attribute
kFragDepth,
/// Builtin SampleMask
kSampleMask,
};
/// Constructor
/// @param rt the function return type
/// @param stage the function stage
/// @param wg_size the workgroup_size
Function(const type::Type* rt,
PipelineStage stage = PipelineStage::kUndefined,
std::optional<std::array<uint32_t, 3>> wg_size = {});
~Function() override;
/// Sets the function stage
/// @param stage the stage to set
void SetStage(PipelineStage stage) { pipeline_stage_ = stage; }
/// @returns the function pipeline stage
PipelineStage Stage() const { return pipeline_stage_; }
/// Sets the workgroup size
/// @param x the x size
/// @param y the y size
/// @param z the z size
void SetWorkgroupSize(uint32_t x, uint32_t y, uint32_t z) { workgroup_size_ = {x, y, z}; }
/// @returns the workgroup size information
std::optional<std::array<uint32_t, 3>> WorkgroupSize() const { return workgroup_size_; }
/// @returns the return type for the function
const type::Type* ReturnType() const { return return_.type; }
/// Sets the return attributes
/// @param builtin the builtin to set
void SetReturnBuiltin(ReturnBuiltin builtin) {
TINT_ASSERT(IR, !return_.builtin.has_value());
return_.builtin = builtin;
}
/// @returns the return builtin attribute
std::optional<enum ReturnBuiltin> ReturnBuiltin() const { return return_.builtin; }
/// Sets the return location
/// @param loc the location to set
/// @param interp the interpolation
void SetReturnLocation(uint32_t loc, std::optional<builtin::Interpolation> interp) {
return_.location = {loc, interp};
}
/// @returns the return location
std::optional<Location> ReturnLocation() const { return return_.location; }
/// Sets the return as invariant
/// @param val the invariant value to set
void SetReturnInvariant(bool val) { return_.invariant = val; }
/// @returns the return invariant value
bool ReturnInvariant() const { return return_.invariant; }
/// Sets the function parameters
/// @param params the function paramters
void SetParams(utils::VectorRef<FunctionParam*> params) { params_ = std::move(params); }
/// @returns the function parameters
utils::VectorRef<FunctionParam*> Params() const { return params_; }
/// Sets the start target for the function
/// @param target the start target
void SetStartTarget(Block* target) { start_target_ = target; }
/// @returns the function start target
Block* StartTarget() const { return start_target_; }
private:
PipelineStage pipeline_stage_;
std::optional<std::array<uint32_t, 3>> workgroup_size_;
struct {
const type::Type* type = nullptr;
std::optional<enum ReturnBuiltin> builtin;
std::optional<Location> location;
bool invariant = false;
} return_;
utils::Vector<FunctionParam*, 1> params_;
Block* start_target_ = nullptr;
};
utils::StringStream& operator<<(utils::StringStream& out, Function::PipelineStage value);
utils::StringStream& operator<<(utils::StringStream& out, enum Function::ReturnBuiltin value);
} // namespace tint::ir
#endif // SRC_TINT_IR_FUNCTION_H_