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https://github.com/encounter/dawn-cmake.git
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41e4d9a34c
This CL updates the clang format files to have a single shared format between Dawn and Tint. The major changes are tabs are 4 spaces, lines are 100 columns and namespaces are not indented. Bug: dawn:1339 Change-Id: I4208742c95643998d9fd14e77a9cc558071ded39 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/87603 Commit-Queue: Dan Sinclair <dsinclair@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org> Kokoro: Kokoro <noreply+kokoro@google.com>
107 lines
4.3 KiB
C++
107 lines
4.3 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_COMBINE_SAMPLERS_H_
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#define SRC_TINT_TRANSFORM_COMBINE_SAMPLERS_H_
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#include <string>
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#include <unordered_map>
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#include "src/tint/sem/sampler_texture_pair.h"
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#include "src/tint/transform/transform.h"
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namespace tint::transform {
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/// This transform converts all separate texture/sampler refences in a
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/// program into combined texture/samplers. This is required for GLSL,
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/// which does not support separate texture/samplers.
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///
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/// It utilizes the texture/sampler information collected by the
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/// Resolver and stored on each sem::Function. For each function, all
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/// separate texture/sampler parameters in the function signature are
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/// removed. For each unique pair, if both texture and sampler are
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/// global variables, the function passes the corresponding combined
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/// global stored in global_combined_texture_samplers_ at the call
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/// site. Otherwise, either the texture or sampler must be a function
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/// parameter. In this case, a new parameter is added to the function
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/// signature. All separate texture/sampler parameters are removed.
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///
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/// All texture builtin callsites are modified to pass the combined
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/// texture/sampler as the first argument, and separate texture/sampler
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/// arguments are removed.
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///
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/// Note that the sampler may be null, indicating that only a texture
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/// reference was required (e.g., textureLoad). In this case, a
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/// placeholder global sampler is used at the AST level. This will be
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/// combined with the original texture to give a combined global, and
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/// the placeholder removed (ignored) by the GLSL writer.
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///
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/// Note that the combined samplers are actually represented by a
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/// Texture node at the AST level, since this contains all the
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/// information needed to represent a combined sampler in GLSL
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/// (dimensionality, component type, etc). The GLSL writer outputs such
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/// (Tint) Textures as (GLSL) Samplers.
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class CombineSamplers final : public Castable<CombineSamplers, Transform> {
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public:
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/// A pair of binding points.
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using SamplerTexturePair = sem::SamplerTexturePair;
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/// A map from a sampler/texture pair to a named global.
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using BindingMap = std::unordered_map<SamplerTexturePair, std::string>;
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/// The client-provided mapping from separate texture and sampler binding
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/// points to combined sampler binding point.
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struct BindingInfo final : public Castable<Data, transform::Data> {
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/// Constructor
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/// @param map the map of all (texture, sampler) -> (combined) pairs
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/// @param placeholder the binding point to use for placeholder samplers.
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BindingInfo(const BindingMap& map, const sem::BindingPoint& placeholder);
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/// Copy constructor
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/// @param other the other BindingInfo to copy
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BindingInfo(const BindingInfo& other);
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/// Destructor
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~BindingInfo() override;
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/// A map of bindings from (texture, sampler) -> combined sampler.
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BindingMap binding_map;
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/// The binding point to use for placeholder samplers.
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sem::BindingPoint placeholder_binding_point;
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};
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/// Constructor
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CombineSamplers();
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/// Destructor
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~CombineSamplers() override;
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protected:
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/// The PIMPL state for this transform
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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, const DataMap& inputs, DataMap& outputs) const override;
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};
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} // namespace tint::transform
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#endif // SRC_TINT_TRANSFORM_COMBINE_SAMPLERS_H_
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