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8648120bbe
And remove a whole load of const_cast hackery. Semantic nodes may contain internally mutable fields (although only ever modified during resolving), so these are always passed by `const` pointer. While all AST nodes are internally immutable, we have decided that pointers to AST nodes should also be marked `const`, for consistency. There's still a collection of const_cast calls in the Resolver. These will be fixed up in a later change. Bug: tint:745 Change-Id: I046309b8e586772605fc0fe6b2d27f28806d40ef Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/66606 Kokoro: Kokoro <noreply+kokoro@google.com> Commit-Queue: Ben Clayton <bclayton@chromium.org> Reviewed-by: David Neto <dneto@google.com>
109 lines
3.6 KiB
C++
109 lines
3.6 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_TRANSFORM_ARRAY_LENGTH_FROM_UNIFORM_H_
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#define SRC_TRANSFORM_ARRAY_LENGTH_FROM_UNIFORM_H_
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#include <unordered_map>
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#include "src/sem/binding_point.h"
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#include "src/transform/transform.h"
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namespace tint {
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// Forward declarations
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class CloneContext;
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namespace 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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/// [[block]]
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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 `InlinePointerLets` and `Simplify`
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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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class ArrayLengthFromUniform
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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 : 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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/// 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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struct Result : public Castable<Result, transform::Data> {
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/// Constructor
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/// @param needs_sizes True if the transform generated the buffer sizes UBO.
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explicit Result(bool needs_sizes);
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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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/// True if the transform generated the buffer sizes UBO.
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const bool needs_buffer_sizes;
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};
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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, const DataMap& inputs, DataMap& outputs) override;
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};
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} // namespace transform
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} // namespace tint
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#endif // SRC_TRANSFORM_ARRAY_LENGTH_FROM_UNIFORM_H_
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