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/*
* Copyright 2020 Google LLC
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef GrBackendSurfaceMutableState_DEFINED
#define GrBackendSurfaceMutableState_DEFINED
#include "include/gpu/GrTypes.h"
#ifdef SK_VULKAN
#include "include/private/GrVkTypesPriv.h"
#endif
/**
* Since Skia and clients can both modify gpu textures and their connected state, Skia needs a way
* for clients to inform us if they have modifiend any of this state. In order to not need setters
* for every single API and state, we use this class to be a generic wrapper around all the mutable
* state. This class is used for calls that inform Skia of these texture/image state changes by the
* client as well as for requesting state changes to be done by Skia. The backend specific state
* that is wrapped by this class are:
*
* Vulkan: VkImageLayout and QueueFamilyIndex
*/
class SK_API GrBackendSurfaceMutableState {
public:
GrBackendSurfaceMutableState() {}
#ifdef SK_VULKAN
GrBackendSurfaceMutableState(VkImageLayout layout, uint32_t queueFamilyIndex)
: fVkState(layout, queueFamilyIndex)
, fBackend(GrBackend::kVulkan)
, fIsValid(true) {}
#endif
GrBackendSurfaceMutableState(const GrBackendSurfaceMutableState& that);
GrBackendSurfaceMutableState& operator=(const GrBackendSurfaceMutableState& that);
#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 != GrBackendApi::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 != GrBackendApi::kVulkan) {
return VK_QUEUE_FAMILY_IGNORED;
}
return fVkState.getQueueFamilyIndex();
}
#endif
// Returns true if the backend mutable state has been initialized.
bool isValid() const { return fIsValid; }
GrBackendApi backend() const { return fBackend; }
private:
friend class GrBackendSurfaceMutableStateImpl;
friend class GrVkGpu;
#ifdef SK_VULKAN
void setVulkanState(VkImageLayout layout, uint32_t queueFamilyIndex) {
SkASSERT(!this->isValid() || fBackend == GrBackendApi::kVulkan);
fVkState.setImageLayout(layout);
fVkState.setQueueFamilyIndex(queueFamilyIndex);
fBackend = GrBackendApi::kVulkan;
fIsValid = true;
}
#endif
union {
char fPlaceholder;
#ifdef SK_VULKAN
GrVkSharedImageInfo fVkState;
#endif
};
GrBackend fBackend = GrBackendApi::kMock;
bool fIsValid = false;
};
#endif
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