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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_TRANSFORM_DECOMPOSE_MEMORY_ACCESS_H_
#define SRC_TRANSFORM_DECOMPOSE_MEMORY_ACCESS_H_
#include <string>
#include "src/ast/internal_decoration.h"
#include "src/transform/transform.h"
namespace tint {
// Forward declarations
class CloneContext;
namespace transform {
/// DecomposeMemoryAccess is a transform used to replace storage and uniform
/// buffer accesses with a combination of load, store or atomic functions on
/// primitive types.
class DecomposeMemoryAccess
: public Castable<DecomposeMemoryAccess, Transform> {
public:
/// Intrinsic is an InternalDecoration that's used to decorate a stub function
/// so that the HLSL transforms this into calls to
/// `[RW]ByteAddressBuffer.Load[N]()` or `[RW]ByteAddressBuffer.Store[N]()`,
/// with a possible cast.
class Intrinsic : public Castable<Intrinsic, ast::InternalDecoration> {
public:
/// Intrinsic op
enum class Op {
kLoad,
kStore,
kAtomicLoad,
kAtomicStore,
kAtomicAdd,
kAtomicMax,
kAtomicMin,
kAtomicAnd,
kAtomicOr,
kAtomicXor,
kAtomicExchange,
kAtomicCompareExchangeWeak,
};
/// Intrinsic data type
enum class DataType {
kU32,
kF32,
kI32,
kVec2U32,
kVec2F32,
kVec2I32,
kVec3U32,
kVec3F32,
kVec3I32,
kVec4U32,
kVec4F32,
kVec4I32,
};
/// Constructor
/// @param program_id the identifier of the program that owns this node
/// @param o the op of the intrinsic
/// @param sc the storage class of the buffer
/// @param ty the data type of the intrinsic
Intrinsic(ProgramID program_id, Op o, ast::StorageClass sc, DataType ty);
/// Destructor
~Intrinsic() override;
/// @return a short description of the internal decoration which will be
/// displayed as `[[internal(<name>)]]`
std::string InternalName() const override;
/// Performs a deep clone of this object using the CloneContext `ctx`.
/// @param ctx the clone context
/// @return the newly cloned object
Intrinsic* Clone(CloneContext* ctx) const override;
/// The op of the intrinsic
Op const op;
/// The storage class of the buffer this intrinsic operates on
ast::StorageClass const storage_class;
/// The type of the intrinsic
DataType const type;
};
/// Constructor
DecomposeMemoryAccess();
/// Destructor
~DecomposeMemoryAccess() override;
protected:
/// Runs the transform using the CloneContext built for transforming a
/// program. Run() is responsible for calling Clone() on the CloneContext.
/// @param ctx the CloneContext primed with the input program and
/// ProgramBuilder
/// @param inputs optional extra transform-specific input data
/// @param outputs optional extra transform-specific output data
void Run(CloneContext& ctx, const DataMap& inputs, DataMap& outputs) override;
struct State;
};
} // namespace transform
} // namespace tint
#endif // SRC_TRANSFORM_DECOMPOSE_MEMORY_ACCESS_H_