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6992f51ebd
Enables the 'chromium_experimental_full_ptr_parameters' extension to allow passing of uniform, storage and workgroup address-spaced pointers as parameters, as well as pointers into sub-objects. Bug: tint:1758 Change-Id: I8c85e6104ef4f2b9a177dec2857b1bf7f5148212 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/103860 Commit-Queue: Ben Clayton <bclayton@google.com> Kokoro: Ben Clayton <bclayton@google.com> Reviewed-by: James Price <jrprice@google.com>
75 lines
3.0 KiB
C++
75 lines
3.0 KiB
C++
// Copyright 2022 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_DIRECT_VARIABLE_ACCESS_H_
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#define SRC_TINT_TRANSFORM_DIRECT_VARIABLE_ACCESS_H_
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#include "src/tint/transform/transform.h"
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namespace tint::transform {
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/// DirectVariableAccess is a transform that allows usage of pointer parameters in the 'storage',
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/// 'uniform' and 'workgroup' address space, and passing of pointers to sub-objects. These pointers
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/// are only allowed by the resolver when the `chromium_experimental_full_ptr_parameters` extension
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/// is enabled.
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///
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/// DirectVariableAccess works by creating specializations of functions that have pointer
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/// parameters, one specialization for each pointer argument's unique access chain 'shape' from a
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/// unique variable. Calls to specialized functions are transformed so that the pointer arguments
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/// are replaced with an array of access-chain indicies, and if the pointer is in the 'function' or
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/// 'private' address space, also with a pointer to the root object. For more information, see the
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/// comments in src/tint/transform/direct_variable_access.cc.
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///
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/// @note DirectVariableAccess requires the transform::Unshadow transform to have been run first.
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class DirectVariableAccess final : public Castable<DirectVariableAccess, Transform> {
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public:
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/// Constructor
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DirectVariableAccess();
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/// Destructor
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~DirectVariableAccess() override;
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/// Options adjusts the behaviour of the transform.
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struct Options {
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/// If true, then 'private' sub-object pointer arguments will be transformed.
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bool transform_private = false;
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/// If true, then 'function' sub-object pointer arguments will be transformed.
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bool transform_function = false;
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};
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/// Config is consumed by the DirectVariableAccess transform.
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/// Config specifies the behavior of the transform.
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struct Config final : public Castable<Data, transform::Data> {
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/// Constructor
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/// @param options behavior of the transform
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explicit Config(const Options& options);
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/// Destructor
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~Config() override;
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/// The transform behavior options
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const Options options;
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};
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/// @copydoc Transform::Apply
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ApplyResult Apply(const Program* program,
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const DataMap& inputs,
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DataMap& outputs) const override;
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private:
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struct State;
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};
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} // namespace tint::transform
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#endif // SRC_TINT_TRANSFORM_DIRECT_VARIABLE_ACCESS_H_
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