chromium/third_party/dawn/src/dawn/native/vulkan/BackendVk.h

// Copyright 2019 The Dawn & Tint Authors
//
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// modification, are permitted provided that the following conditions are met:
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//    list of conditions and the following disclaimer.
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//    this list of conditions and the following disclaimer in the documentation
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#ifndef SRC_DAWN_NATIVE_VULKAN_BACKENDVK_H_
#define SRC_DAWN_NATIVE_VULKAN_BACKENDVK_H_

#include <mutex>
#include <string>
#include <vector>

#include "dawn/native/BackendConnection.h"

#include "absl/container/flat_hash_map.h"
#include "dawn/common/DynamicLib.h"
#include "dawn/common/Ref.h"
#include "dawn/common/RefCounted.h"
#include "dawn/common/ityp_array.h"
#include "dawn/native/vulkan/PhysicalDeviceVk.h"
#include "dawn/native/vulkan/VulkanFunctions.h"
#include "dawn/native/vulkan/VulkanInfo.h"

namespace dawn::native::vulkan {

enum class ICD { … };
constexpr uint32_t kICDCount = …;

class Device;

// VulkanInstance holds the reference to the Vulkan library, the VkInstance, VkPhysicalDevices
// on that instance, Vulkan functions loaded from the library, and global information
// gathered from the instance. VkPhysicalDevices bound to the VkInstance are bound to the GPU
// and GPU driver, keeping them active. It is RefCounted so that (eventually) when all adapters
// on an instance are no longer in use, the instance is deleted. This can be particuarly useful
// when we create multiple instances to selectively discover ICDs (like only
// SwiftShader/iGPU/dGPU/eGPU), and only one physical device on one instance remains in use. We
// can delete the VkInstances that are not in use to avoid holding the discrete GPU active.
class VulkanInstance : public RefCounted { … };

class Backend : public BackendConnection { … };

}  // namespace dawn::native::vulkan

#endif  // SRC_DAWN_NATIVE_VULKAN_BACKENDVK_H_