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c6b381495d
Replace the ShouldRun() method with Apply() which will do the transformation if it needs to be done, otherwise returns 'SkipTransform'. This reduces a bunch of duplicated scanning between the old ShouldRun() and Transform(). This change also adjusts code style to make the transforms more consistent. Change-Id: I9a6b10cb8b4ed62676b12ef30fb7764d363386c6 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/107681 Reviewed-by: James Price <jrprice@google.com> Kokoro: Kokoro <noreply+kokoro@google.com> Commit-Queue: Ben Clayton <bclayton@google.com> Reviewed-by: Dan Sinclair <dsinclair@chromium.org>
95 lines
3.8 KiB
C++
95 lines
3.8 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_MULTIPLANAR_EXTERNAL_TEXTURE_H_
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#define SRC_TINT_TRANSFORM_MULTIPLANAR_EXTERNAL_TEXTURE_H_
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#include <unordered_map>
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#include <utility>
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#include "src/tint/ast/struct_member.h"
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#include "src/tint/sem/binding_point.h"
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#include "src/tint/sem/builtin_type.h"
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#include "src/tint/transform/transform.h"
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namespace tint::transform {
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/// BindingPoint is an alias to sem::BindingPoint
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using BindingPoint = sem::BindingPoint;
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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 separate Y and UV
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/// planes, and do colorspace conversions including yuv->rgb conversion, gamma
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/// decoding, gamut conversion, and gamma encoding steps. Specifically
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// for BT.709 to SRGB conversion, it takes the fast path only doing the yuv->rgb
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// step and skipping all other steps.
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class MultiplanarExternalTexture final : public Castable<MultiplanarExternalTexture, Transform> {
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public:
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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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/// Reflect the fields of this class so that it can be used by tint::ForeachField()
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TINT_REFLECT(plane_1, params);
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};
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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 final : 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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/// @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_MULTIPLANAR_EXTERNAL_TEXTURE_H_
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