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30353998c1
In our backends, we std::move this unordered_set into the Results struct, but because we'd get a const reference to a const object, std::move would cast this to a const r-value, which binds to const ref, and thus would end up copying instead of moving. This change just ensures that we get a non-const ref to a non-const unordered_set where we do the move. Bug: tint:1495 Change-Id: I8d1cfe66b8343bae4146fc85fc86d72bac41a1a1 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/86202 Reviewed-by: Ben Clayton <bclayton@google.com> Commit-Queue: Antonio Maiorano <amaiorano@google.com>
125 lines
4.2 KiB
C++
125 lines
4.2 KiB
C++
// Copyright 2021 The Tint Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SRC_TINT_TRANSFORM_ARRAY_LENGTH_FROM_UNIFORM_H_
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#define SRC_TINT_TRANSFORM_ARRAY_LENGTH_FROM_UNIFORM_H_
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#include <unordered_map>
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#include <unordered_set>
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#include "src/tint/sem/binding_point.h"
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#include "src/tint/transform/transform.h"
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// Forward declarations
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namespace tint {
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class CloneContext;
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}
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namespace tint::transform {
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/// ArrayLengthFromUniform is a transform that implements calls to arrayLength()
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/// by calculating the length from the total size of the storage buffer, which
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/// is received via a uniform buffer.
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///
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/// The generated uniform buffer will have the form:
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/// ```
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/// struct buffer_size_struct {
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/// buffer_size : array<u32, 8>;
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/// };
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///
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/// @group(0) @binding(30)
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/// var<uniform> buffer_size_ubo : buffer_size_struct;
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/// ```
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/// The binding group and number used for this uniform buffer is provided via
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/// the `Config` transform input. The `Config` struct also defines the mapping
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/// from a storage buffer's `BindingPoint` to the array index that will be used
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/// to get the size of that buffer.
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///
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/// This transform assumes that the `SimplifyPointers`
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/// transforms have been run before it so that arguments to the arrayLength
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/// builtin always have the form `&resource.array`.
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///
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/// @note Depends on the following transforms to have been run first:
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/// * SimplifyPointers
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class ArrayLengthFromUniform final
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: public Castable<ArrayLengthFromUniform, Transform> {
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public:
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/// Constructor
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ArrayLengthFromUniform();
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/// Destructor
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~ArrayLengthFromUniform() override;
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/// Configuration options for the ArrayLengthFromUniform transform.
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struct Config final : public Castable<Data, transform::Data> {
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/// Constructor
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/// @param ubo_bp the binding point to use for the generated uniform buffer.
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explicit Config(sem::BindingPoint ubo_bp);
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/// Copy constructor
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Config(const Config&);
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/// Copy assignment
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/// @return this Config
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Config& operator=(const Config&);
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/// Destructor
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~Config() override;
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/// The binding point to use for the generated uniform buffer.
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sem::BindingPoint ubo_binding;
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/// The mapping from binding point to the index for the buffer size lookup.
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std::unordered_map<sem::BindingPoint, uint32_t> bindpoint_to_size_index;
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};
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/// Information produced about what the transform did.
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/// If there were no calls to the arrayLength() builtin, then no Result will
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/// be emitted.
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struct Result final : public Castable<Result, transform::Data> {
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/// Constructor
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/// @param used_size_indices Indices into the UBO that are statically used.
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explicit Result(std::unordered_set<uint32_t> used_size_indices);
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/// Copy constructor
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Result(const Result&);
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/// Destructor
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~Result() override;
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/// Indices into the UBO that are statically used.
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std::unordered_set<uint32_t> used_size_indices;
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};
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/// @param program the program to inspect
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/// @param data optional extra transform-specific input data
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/// @returns true if this transform should be run for the given program
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bool ShouldRun(const Program* program,
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const DataMap& data = {}) const override;
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protected:
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/// Runs the transform using the CloneContext built for transforming a
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/// program. Run() is responsible for calling Clone() on the CloneContext.
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/// @param ctx the CloneContext primed with the input program and
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/// ProgramBuilder
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/// @param inputs optional extra transform-specific input data
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/// @param outputs optional extra transform-specific output data
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void Run(CloneContext& ctx,
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const DataMap& inputs,
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DataMap& outputs) const override;
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};
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} // namespace tint::transform
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#endif // SRC_TINT_TRANSFORM_ARRAY_LENGTH_FROM_UNIFORM_H_
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