MutableTextureState.h

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/*
 * Copyright 2022 Google LLC.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
#ifndef skgpu_MutableTextureState_DEFINED
#define skgpu_MutableTextureState_DEFINED
 
#include "include/core/SkTypes.h"
#include "include/gpu/GpuTypes.h"
 
#ifdef SK_VULKAN
#include "include/private/gpu/vk/SkiaVulkan.h"
#include "include/private/gpu/vk/VulkanTypesPriv.h"
 
#include <cstdint>
#endif
 
#include <new>
 
class GrVkGpu;
 
namespace skgpu {
 
class SK_API MutableTextureState {
public:
    MutableTextureState() {}
 
#ifdef SK_VULKAN
    MutableTextureState(VkImageLayout layout, uint32_t queueFamilyIndex)
            : fVkState(layout, queueFamilyIndex)
            , fBackend(BackendApi::kVulkan)
            , fIsValid(true) {}
#endif
 
    MutableTextureState(const MutableTextureState& that)
            : fBackend(that.fBackend), fIsValid(that.fIsValid) {
        if (!fIsValid) {
            return;
        }
        switch (fBackend) {
            case BackendApi::kVulkan:
    #ifdef SK_VULKAN
                SkASSERT(that.fBackend == BackendApi::kVulkan);
                fVkState = that.fVkState;
    #endif
                break;
            default:
                (void)that;
                SkUNREACHABLE;
        }
    }
 
    MutableTextureState& operator=(const MutableTextureState& that) {
        if (this != &that) {
            this->~MutableTextureState();
            new (this) MutableTextureState(that);
        }
        return *this;
    }
 
#ifdef SK_VULKAN
    // If this class is not Vulkan backed it will return value of VK_IMAGE_LAYOUT_UNDEFINED.
    // Otherwise it will return the VkImageLayout.
    VkImageLayout getVkImageLayout() const {
        if (this->isValid() && fBackend != BackendApi::kVulkan) {
            return VK_IMAGE_LAYOUT_UNDEFINED;
        }
        return fVkState.getImageLayout();
    }
 
    // If this class is not Vulkan backed it will return value of VK_QUEUE_FAMILY_IGNORED.
    // Otherwise it will return the VkImageLayout.
    uint32_t getQueueFamilyIndex() const {
        if (this->isValid() && fBackend != BackendApi::kVulkan) {
            return VK_QUEUE_FAMILY_IGNORED;
        }
        return fVkState.getQueueFamilyIndex();
    }
#endif
 
    BackendApi backend() const { return fBackend; }
 
    // Returns true if the backend mutable state has been initialized.
    bool isValid() const { return fIsValid; }
 
private:
    friend class MutableTextureStateRef;
    friend class ::GrVkGpu;
 
#ifdef SK_VULKAN
    void setVulkanState(VkImageLayout layout, uint32_t queueFamilyIndex) {
        SkASSERT(!this->isValid() || fBackend == BackendApi::kVulkan);
        fVkState.setImageLayout(layout);
        fVkState.setQueueFamilyIndex(queueFamilyIndex);
        fBackend = BackendApi::kVulkan;
        fIsValid = true;
    }
#endif
 
    union {
        char fPlaceholder;
#ifdef SK_VULKAN
        VulkanMutableTextureState fVkState;
#endif
    };
 
    BackendApi fBackend = BackendApi::kMock;
    bool fIsValid = false;
};
 
} // namespace skgpu
 
#endif // skgpu_MutableTextureState_DEFINED