src/dawn/native/PipelineLayout.h

// Copyright 2017 The Dawn & Tint Authors
//
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// modification, are permitted provided that the following conditions are met:
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// 1. Redistributions of source code must retain the above copyright notice, this
//    list of conditions and the following disclaimer.
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// 2. Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
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// 3. Neither the name of the copyright holder nor the names of its
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//    this software without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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#ifndef SRC_DAWN_NATIVE_PIPELINELAYOUT_H_
#define SRC_DAWN_NATIVE_PIPELINELAYOUT_H_

#include <array>
#include <bitset>
#include <string>
#include <vector>

#include "dawn/common/Constants.h"
#include "dawn/common/ContentLessObjectCacheable.h"
#include "dawn/common/ityp_array.h"
#include "dawn/common/ityp_bitset.h"
#include "dawn/native/BindingInfo.h"
#include "dawn/native/CachedObject.h"
#include "dawn/native/Error.h"
#include "dawn/native/Forward.h"
#include "dawn/native/ObjectBase.h"

#include "dawn/native/dawn_platform.h"

namespace dawn::native {

MaybeError ValidatePipelineLayoutDescriptor(
    DeviceBase*,
    const PipelineLayoutDescriptor* descriptor,
    PipelineCompatibilityToken pipelineCompatibilityToken = PipelineCompatibilityToken(0));

using BindGroupLayoutArray = ityp::array<BindGroupIndex, Ref<BindGroupLayoutBase>, kMaxBindGroups>;
using BindGroupLayoutMask = ityp::bitset<BindGroupIndex, kMaxBindGroups>;

struct StageAndDescriptor {
    StageAndDescriptor(SingleShaderStage shaderStage,
                       ShaderModuleBase* module,
                       const char* entryPoint,
                       size_t constantCount,
                       ConstantEntry const* constants);

    SingleShaderStage shaderStage;
    ShaderModuleBase* module;
    std::string entryPoint;
    size_t constantCount = 0u;
    ConstantEntry const* constants = nullptr;
};

class PipelineLayoutBase : public ApiObjectBase,
                           public CachedObject,
                           public ContentLessObjectCacheable<PipelineLayoutBase> {
  public:
    PipelineLayoutBase(DeviceBase* device,
                       const PipelineLayoutDescriptor* descriptor,
                       ApiObjectBase::UntrackedByDeviceTag tag);
    PipelineLayoutBase(DeviceBase* device, const PipelineLayoutDescriptor* descriptor);
    ~PipelineLayoutBase() override;

    static PipelineLayoutBase* MakeError(DeviceBase* device, const char* label);
    static ResultOrError<Ref<PipelineLayoutBase>> CreateDefault(
        DeviceBase* device,
        std::vector<StageAndDescriptor> stages);

    ObjectType GetType() const override;

    const BindGroupLayoutBase* GetFrontendBindGroupLayout(BindGroupIndex group) const;
    BindGroupLayoutBase* GetFrontendBindGroupLayout(BindGroupIndex group);
    const BindGroupLayoutInternalBase* GetBindGroupLayout(BindGroupIndex group) const;
    BindGroupLayoutInternalBase* GetBindGroupLayout(BindGroupIndex group);
    const BindGroupLayoutMask& GetBindGroupLayoutsMask() const;
    bool HasPixelLocalStorage() const;
    const std::vector<wgpu::TextureFormat>& GetStorageAttachmentSlots() const;
    bool HasAnyStorageAttachments() const;

    // Utility functions to compute inherited bind groups.
    // Returns the inherited bind groups as a mask.
    BindGroupLayoutMask InheritedGroupsMask(const PipelineLayoutBase* other) const;

    // Returns the index of the first incompatible bind group in the range
    // [0, kMaxBindGroups]
    BindGroupIndex GroupsInheritUpTo(const PipelineLayoutBase* other) const;

    // Functions necessary for the unordered_set<PipelineLayoutBase*>-based cache.
    size_t ComputeContentHash() override;

    struct EqualityFunc {
        bool operator()(const PipelineLayoutBase* a, const PipelineLayoutBase* b) const;
    };

  protected:
    PipelineLayoutBase(DeviceBase* device, ObjectBase::ErrorTag tag, const char* label);
    void DestroyImpl() override;

    BindGroupLayoutArray mBindGroupLayouts;
    BindGroupLayoutMask mMask;
    bool mHasPLS = false;
    std::vector<wgpu::TextureFormat> mStorageAttachmentSlots;
};

}  // namespace dawn::native

#endif  // SRC_DAWN_NATIVE_PIPELINELAYOUT_H_