69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
/*
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* Copyright 2022 Google LLC
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef skgpu_MutableTextureState_DEFINED
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#define skgpu_MutableTextureState_DEFINED
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#include "include/core/SkRefCnt.h"
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#include "include/core/SkTypes.h"
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#include "include/private/base/SkAnySubclass.h"
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#include <cstddef>
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namespace skgpu {
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enum class BackendApi : unsigned int;
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class MutableTextureStateData;
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/**
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* Since Skia and clients can both modify gpu textures and their connected state, Skia needs a way
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* for clients to inform us if they have modifiend any of this state. In order to not need setters
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* for every single API and state, we use this class to be a generic wrapper around all the mutable
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* state. This class is used for calls that inform Skia of these texture/image state changes by the
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* client as well as for requesting state changes to be done by Skia. The backend specific state
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* that is wrapped by this class are located in files like:
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* - include/gpu/vk/VulkanMutableTextureState.h
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*/
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class SK_API MutableTextureState : public SkRefCnt {
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public:
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MutableTextureState();
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~MutableTextureState() override;
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MutableTextureState(const MutableTextureState& that);
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MutableTextureState& operator=(const MutableTextureState& that);
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void set(const MutableTextureState& that);
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BackendApi backend() const { return fBackend; }
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// Returns true if the backend mutable state has been initialized.
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bool isValid() const { return fIsValid; }
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private:
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friend class MutableTextureStateData;
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friend class MutableTextureStatePriv;
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// Size determined by looking at the MutableTextureStateData subclasses, then
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// guessing-and-checking. Compiler will complain if this is too small - in that case,
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// just increase the number.
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inline constexpr static size_t kMaxSubclassSize = 16;
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using AnyStateData = SkAnySubclass<MutableTextureStateData, kMaxSubclassSize>;
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template <typename StateData>
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MutableTextureState(BackendApi api, const StateData& data) : fBackend(api), fIsValid(true) {
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fStateData.emplace<StateData>(data);
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}
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AnyStateData fStateData;
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BackendApi fBackend;
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bool fIsValid;
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};
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} // namespace skgpu
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#endif // skgpu_MutableTextureState_DEFINED
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