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b85e692aa7
This matches the term used in the WGSL spec. Change-Id: I4603332b828450c126ef806f1064ed54f372013f Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/78787 Reviewed-by: James Price <jrprice@google.com> Kokoro: Kokoro <noreply+kokoro@google.com>
103 lines
3.9 KiB
C++
103 lines
3.9 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_MULTIPLANAR_EXTERNAL_TEXTURE_H_
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#define SRC_TRANSFORM_MULTIPLANAR_EXTERNAL_TEXTURE_H_
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#include <unordered_map>
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#include <utility>
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#include "src/ast/struct_member.h"
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#include "src/sem/binding_point.h"
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#include "src/sem/builtin_type.h"
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#include "src/transform/transform.h"
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namespace tint {
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namespace transform {
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/// BindingPoint is an alias to sem::BindingPoint
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using BindingPoint = sem::BindingPoint;
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/// This struct identifies the binding groups and locations for new bindings to
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/// use when transforming a texture_external instance.
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struct BindingPoints {
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/// The desired binding location of the texture_2d representing plane #1 when
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/// a texture_external binding is expanded.
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BindingPoint plane_1;
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/// The desired binding location of the ExternalTextureParams uniform when a
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/// texture_external binding is expanded.
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BindingPoint params;
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};
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/// Within the MultiplanarExternalTexture transform, each instance of a
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/// texture_external binding is unpacked into two texture_2d<f32> bindings
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/// representing two possible planes of a texture and a uniform buffer binding
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/// representing a struct of parameters. Calls to textureLoad or
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/// textureSampleLevel that contain a texture_external parameter will be
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/// transformed into a newly generated version of the function, which can
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/// perform the desired operation on a single RGBA plane or on seperate Y and UV
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/// planes.
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class MultiplanarExternalTexture
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: public Castable<MultiplanarExternalTexture, Transform> {
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public:
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/// BindingsMap is a map where the key is the binding location of a
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/// texture_external and the value is a struct containing the desired
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/// locations for new bindings expanded from the texture_external instance.
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using BindingsMap = std::unordered_map<BindingPoint, BindingPoints>;
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/// NewBindingPoints is consumed by the MultiplanarExternalTexture transform.
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/// Data holds information about location of each texture_external binding and
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/// which binding slots it should expand into.
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struct NewBindingPoints : public Castable<Data, transform::Data> {
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/// Constructor
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/// @param bm a map to the new binding slots to use.
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explicit NewBindingPoints(BindingsMap bm);
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/// Destructor
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~NewBindingPoints() override;
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/// A map of new binding points to use.
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const BindingsMap bindings_map;
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};
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/// Constructor
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MultiplanarExternalTexture();
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/// Destructor
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~MultiplanarExternalTexture() override;
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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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struct State;
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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 transform
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} // namespace tint
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#endif // SRC_TRANSFORM_MULTIPLANAR_EXTERNAL_TEXTURE_H_
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