layers/threading.cpp

/*
 * Vulkan
 *
 * Copyright (C) 2015 Valve, Inc.
 * Copyright (C) 2016 Google, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unordered_map>
#include <list>

#include "vk_loader_platform.h"
#include "vulkan/vk_layer.h"
#include "vk_layer_config.h"
#include "vk_layer_extension_utils.h"
#include "vk_layer_utils.h"
#include "vk_layer_table.h"
#include "vk_layer_logging.h"
#include "threading.h"
#include "vk_dispatch_table_helper.h"
#include "vk_enum_string_helper.h"
#include "vk_layer_data.h"
#include "vk_layer_utils.h"

#include "thread_check.h"

namespace threading {

static uint32_t loader_layer_if_version = CURRENT_LOADER_LAYER_INTERFACE_VERSION;

static void initThreading(layer_data *my_data, const VkAllocationCallbacks *pAllocator) {
    layer_debug_actions(my_data->report_data, my_data->logging_callback, pAllocator, "google_threading");
}

VKAPI_ATTR VkResult VKAPI_CALL CreateInstance(const VkInstanceCreateInfo *pCreateInfo, const VkAllocationCallbacks *pAllocator,
                                              VkInstance *pInstance) {
    VkLayerInstanceCreateInfo *chain_info = get_chain_info(pCreateInfo, VK_LAYER_LINK_INFO);

    assert(chain_info->u.pLayerInfo);
    PFN_vkGetInstanceProcAddr fpGetInstanceProcAddr = chain_info->u.pLayerInfo->pfnNextGetInstanceProcAddr;
    PFN_vkCreateInstance fpCreateInstance = (PFN_vkCreateInstance)fpGetInstanceProcAddr(NULL, "vkCreateInstance");
    if (fpCreateInstance == NULL) {
        return VK_ERROR_INITIALIZATION_FAILED;
    }

    // Advance the link info for the next element on the chain
    chain_info->u.pLayerInfo = chain_info->u.pLayerInfo->pNext;

    VkResult result = fpCreateInstance(pCreateInfo, pAllocator, pInstance);
    if (result != VK_SUCCESS) return result;

    layer_data *my_data = GetLayerDataPtr(get_dispatch_key(*pInstance), layer_data_map);
    my_data->instance = *pInstance;
    my_data->instance_dispatch_table = new VkLayerInstanceDispatchTable;
    layer_init_instance_dispatch_table(*pInstance, my_data->instance_dispatch_table, fpGetInstanceProcAddr);

    my_data->report_data = debug_report_create_instance(my_data->instance_dispatch_table, *pInstance,
                                                        pCreateInfo->enabledExtensionCount, pCreateInfo->ppEnabledExtensionNames);
    initThreading(my_data, pAllocator);

    // Look for one or more debug report create info structures, and copy the
    // callback(s) for each one found (for use by vkDestroyInstance)
    layer_copy_tmp_callbacks(pCreateInfo->pNext, &my_data->num_tmp_callbacks, &my_data->tmp_dbg_create_infos,
                             &my_data->tmp_callbacks);
    return result;
}

VKAPI_ATTR void VKAPI_CALL DestroyInstance(VkInstance instance, const VkAllocationCallbacks *pAllocator) {
    dispatch_key key = get_dispatch_key(instance);
    layer_data *my_data = GetLayerDataPtr(key, layer_data_map);
    VkLayerInstanceDispatchTable *pTable = my_data->instance_dispatch_table;

    // Enable the temporary callback(s) here to catch cleanup issues:
    bool callback_setup = false;
    if (my_data->num_tmp_callbacks > 0) {
        if (!layer_enable_tmp_callbacks(my_data->report_data, my_data->num_tmp_callbacks, my_data->tmp_dbg_create_infos,
                                        my_data->tmp_callbacks)) {
            callback_setup = true;
        }
    }

    bool threadChecks = startMultiThread();
    if (threadChecks) {
        startWriteObject(my_data, instance);
    }
    pTable->DestroyInstance(instance, pAllocator);
    if (threadChecks) {
        finishWriteObject(my_data, instance);
    } else {
        finishMultiThread();
    }

    // Disable and cleanup the temporary callback(s):
    if (callback_setup) {
        layer_disable_tmp_callbacks(my_data->report_data, my_data->num_tmp_callbacks, my_data->tmp_callbacks);
    }
    if (my_data->num_tmp_callbacks > 0) {
        layer_free_tmp_callbacks(my_data->tmp_dbg_create_infos, my_data->tmp_callbacks);
        my_data->num_tmp_callbacks = 0;
    }

    // Clean up logging callback, if any
    while (my_data->logging_callback.size() > 0) {
        VkDebugReportCallbackEXT callback = my_data->logging_callback.back();
        layer_destroy_msg_callback(my_data->report_data, callback, pAllocator);
        my_data->logging_callback.pop_back();
    }

    layer_debug_report_destroy_instance(my_data->report_data);
    delete my_data->instance_dispatch_table;
    FreeLayerDataPtr(key, layer_data_map);
}

VKAPI_ATTR VkResult VKAPI_CALL CreateDevice(VkPhysicalDevice gpu, const VkDeviceCreateInfo *pCreateInfo,
                                            const VkAllocationCallbacks *pAllocator, VkDevice *pDevice) {
    layer_data *my_instance_data = GetLayerDataPtr(get_dispatch_key(gpu), layer_data_map);
    VkLayerDeviceCreateInfo *chain_info = get_chain_info(pCreateInfo, VK_LAYER_LINK_INFO);

    assert(chain_info->u.pLayerInfo);
    PFN_vkGetInstanceProcAddr fpGetInstanceProcAddr = chain_info->u.pLayerInfo->pfnNextGetInstanceProcAddr;
    PFN_vkGetDeviceProcAddr fpGetDeviceProcAddr = chain_info->u.pLayerInfo->pfnNextGetDeviceProcAddr;
    PFN_vkCreateDevice fpCreateDevice = (PFN_vkCreateDevice)fpGetInstanceProcAddr(my_instance_data->instance, "vkCreateDevice");
    if (fpCreateDevice == NULL) {
        return VK_ERROR_INITIALIZATION_FAILED;
    }

    // Advance the link info for the next element on the chain
    chain_info->u.pLayerInfo = chain_info->u.pLayerInfo->pNext;

    VkResult result = fpCreateDevice(gpu, pCreateInfo, pAllocator, pDevice);
    if (result != VK_SUCCESS) {
        return result;
    }

    layer_data *my_device_data = GetLayerDataPtr(get_dispatch_key(*pDevice), layer_data_map);

    // Setup device dispatch table
    my_device_data->device_dispatch_table = new VkLayerDispatchTable;
    layer_init_device_dispatch_table(*pDevice, my_device_data->device_dispatch_table, fpGetDeviceProcAddr);

    my_device_data->report_data = layer_debug_report_create_device(my_instance_data->report_data, *pDevice);
    return result;
}

VKAPI_ATTR void VKAPI_CALL DestroyDevice(VkDevice device, const VkAllocationCallbacks *pAllocator) {
    dispatch_key key = get_dispatch_key(device);
    layer_data *dev_data = GetLayerDataPtr(key, layer_data_map);
    bool threadChecks = startMultiThread();
    if (threadChecks) {
        startWriteObject(dev_data, device);
    }
    dev_data->device_dispatch_table->DestroyDevice(device, pAllocator);
    if (threadChecks) {
        finishWriteObject(dev_data, device);
    } else {
        finishMultiThread();
    }

    delete dev_data->device_dispatch_table;
    FreeLayerDataPtr(key, layer_data_map);
}

VKAPI_ATTR VkResult VKAPI_CALL GetSwapchainImagesKHR(VkDevice device, VkSwapchainKHR swapchain, uint32_t *pSwapchainImageCount,
                                                     VkImage *pSwapchainImages) {
    dispatch_key key = get_dispatch_key(device);
    layer_data *my_data = GetLayerDataPtr(key, layer_data_map);
    VkLayerDispatchTable *pTable = my_data->device_dispatch_table;
    VkResult result;
    bool threadChecks = startMultiThread();
    if (threadChecks) {
        startReadObject(my_data, device);
        startReadObject(my_data, swapchain);
    }
    result = pTable->GetSwapchainImagesKHR(device, swapchain, pSwapchainImageCount, pSwapchainImages);
    if (threadChecks) {
        finishReadObject(my_data, device);
        finishReadObject(my_data, swapchain);
    } else {
        finishMultiThread();
    }
    return result;
}

static const VkExtensionProperties threading_extensions[] = {
    {VK_EXT_DEBUG_REPORT_EXTENSION_NAME, VK_EXT_DEBUG_REPORT_SPEC_VERSION}};

static const VkLayerProperties layerProps = {
    "VK_LAYER_GOOGLE_threading",
    VK_LAYER_API_VERSION,  // specVersion
    1, "Google Validation Layer",
};

static inline PFN_vkVoidFunction layer_intercept_proc(const char *name) {
    for (unsigned int i = 0; i < sizeof(procmap) / sizeof(procmap[0]); i++) {
        if (!strcmp(name, procmap[i].name)) return procmap[i].pFunc;
    }
    return NULL;
}

VKAPI_ATTR VkResult VKAPI_CALL EnumerateInstanceLayerProperties(uint32_t *pCount, VkLayerProperties *pProperties) {
    return util_GetLayerProperties(1, &layerProps, pCount, pProperties);
}

VKAPI_ATTR VkResult VKAPI_CALL EnumerateDeviceLayerProperties(VkPhysicalDevice physicalDevice, uint32_t *pCount,
                                                              VkLayerProperties *pProperties) {
    return util_GetLayerProperties(1, &layerProps, pCount, pProperties);
}

VKAPI_ATTR VkResult VKAPI_CALL EnumerateInstanceExtensionProperties(const char *pLayerName, uint32_t *pCount,
                                                                    VkExtensionProperties *pProperties) {
    if (pLayerName && !strcmp(pLayerName, layerProps.layerName))
        return util_GetExtensionProperties(1, threading_extensions, pCount, pProperties);

    return VK_ERROR_LAYER_NOT_PRESENT;
}

VKAPI_ATTR VkResult VKAPI_CALL EnumerateDeviceExtensionProperties(VkPhysicalDevice physicalDevice, const char *pLayerName,
                                                                  uint32_t *pCount, VkExtensionProperties *pProperties) {
    // Threading layer does not have any device extensions
    if (pLayerName && !strcmp(pLayerName, layerProps.layerName))
        return util_GetExtensionProperties(0, nullptr, pCount, pProperties);

    assert(physicalDevice);

    dispatch_key key = get_dispatch_key(physicalDevice);
    layer_data *my_data = GetLayerDataPtr(key, layer_data_map);
    return my_data->instance_dispatch_table->EnumerateDeviceExtensionProperties(physicalDevice, NULL, pCount, pProperties);
}

// Need to prototype this call because it's internal and does not show up in vk.xml
VKAPI_ATTR PFN_vkVoidFunction VKAPI_CALL GetPhysicalDeviceProcAddr(VkInstance instance, const char *funcName);

static inline PFN_vkVoidFunction layer_intercept_instance_proc(const char *name) {
    if (!name || name[0] != 'v' || name[1] != 'k') return NULL;

    name += 2;
    if (!strcmp(name, "CreateInstance")) return (PFN_vkVoidFunction)CreateInstance;
    if (!strcmp(name, "DestroyInstance")) return (PFN_vkVoidFunction)DestroyInstance;
    if (!strcmp(name, "EnumerateInstanceLayerProperties")) return (PFN_vkVoidFunction)EnumerateInstanceLayerProperties;
    if (!strcmp(name, "EnumerateInstanceExtensionProperties")) return (PFN_vkVoidFunction)EnumerateInstanceExtensionProperties;
    if (!strcmp(name, "EnumerateDeviceLayerProperties")) return (PFN_vkVoidFunction)EnumerateDeviceLayerProperties;
    if (!strcmp(name, "EnumerateDeviceExtensionProperties")) return (PFN_vkVoidFunction)EnumerateDeviceExtensionProperties;
    if (!strcmp(name, "CreateDevice")) return (PFN_vkVoidFunction)CreateDevice;
    if (!strcmp(name, "GetInstanceProcAddr")) return (PFN_vkVoidFunction)GetInstanceProcAddr;
    if (!strcmp(name, "GetPhysicalDeviceProcAddr")) return (PFN_vkVoidFunction)GetPhysicalDeviceProcAddr;

    return NULL;
}

VKAPI_ATTR PFN_vkVoidFunction VKAPI_CALL GetDeviceProcAddr(VkDevice device, const char *funcName) {
    PFN_vkVoidFunction addr;
    layer_data *dev_data;

    assert(device);

    addr = layer_intercept_proc(funcName);
    if (addr) return addr;

    dev_data = GetLayerDataPtr(get_dispatch_key(device), layer_data_map);
    VkLayerDispatchTable *pTable = dev_data->device_dispatch_table;

    if (pTable->GetDeviceProcAddr == NULL) return NULL;
    return pTable->GetDeviceProcAddr(device, funcName);
}

VKAPI_ATTR PFN_vkVoidFunction VKAPI_CALL GetInstanceProcAddr(VkInstance instance, const char *funcName) {
    PFN_vkVoidFunction addr;
    layer_data *my_data;

    addr = layer_intercept_instance_proc(funcName);
    if (!addr) addr = layer_intercept_proc(funcName);
    if (addr) {
        return addr;
    }

    assert(instance);

    my_data = GetLayerDataPtr(get_dispatch_key(instance), layer_data_map);
    addr = debug_report_get_instance_proc_addr(my_data->report_data, funcName);
    if (addr) {
        return addr;
    }

    VkLayerInstanceDispatchTable *pTable = my_data->instance_dispatch_table;
    if (pTable->GetInstanceProcAddr == NULL) {
        return NULL;
    }
    return pTable->GetInstanceProcAddr(instance, funcName);
}

VKAPI_ATTR PFN_vkVoidFunction VKAPI_CALL GetPhysicalDeviceProcAddr(VkInstance instance, const char *funcName) {
    assert(instance);

    layer_data *my_data;
    my_data = GetLayerDataPtr(get_dispatch_key(instance), layer_data_map);
    VkLayerInstanceDispatchTable *pTable = my_data->instance_dispatch_table;

    if (pTable->GetPhysicalDeviceProcAddr == NULL) return NULL;
    return pTable->GetPhysicalDeviceProcAddr(instance, funcName);
}

VKAPI_ATTR VkResult VKAPI_CALL CreateDebugReportCallbackEXT(VkInstance instance,
                                                            const VkDebugReportCallbackCreateInfoEXT *pCreateInfo,
                                                            const VkAllocationCallbacks *pAllocator,
                                                            VkDebugReportCallbackEXT *pMsgCallback) {
    layer_data *my_data = GetLayerDataPtr(get_dispatch_key(instance), layer_data_map);
    bool threadChecks = startMultiThread();
    if (threadChecks) {
        startReadObject(my_data, instance);
    }
    VkResult result =
        my_data->instance_dispatch_table->CreateDebugReportCallbackEXT(instance, pCreateInfo, pAllocator, pMsgCallback);
    if (VK_SUCCESS == result) {
        result = layer_create_msg_callback(my_data->report_data, false, pCreateInfo, pAllocator, pMsgCallback);
    }
    if (threadChecks) {
        finishReadObject(my_data, instance);
    } else {
        finishMultiThread();
    }
    return result;
}

VKAPI_ATTR void VKAPI_CALL DestroyDebugReportCallbackEXT(VkInstance instance, VkDebugReportCallbackEXT callback,
                                                         const VkAllocationCallbacks *pAllocator) {
    layer_data *my_data = GetLayerDataPtr(get_dispatch_key(instance), layer_data_map);
    bool threadChecks = startMultiThread();
    if (threadChecks) {
        startReadObject(my_data, instance);
        startWriteObject(my_data, callback);
    }
    my_data->instance_dispatch_table->DestroyDebugReportCallbackEXT(instance, callback, pAllocator);
    layer_destroy_msg_callback(my_data->report_data, callback, pAllocator);
    if (threadChecks) {
        finishReadObject(my_data, instance);
        finishWriteObject(my_data, callback);
    } else {
        finishMultiThread();
    }
}

VKAPI_ATTR VkResult VKAPI_CALL AllocateCommandBuffers(VkDevice device, const VkCommandBufferAllocateInfo *pAllocateInfo,
                                                      VkCommandBuffer *pCommandBuffers) {
    dispatch_key key = get_dispatch_key(device);
    layer_data *my_data = GetLayerDataPtr(key, layer_data_map);
    VkLayerDispatchTable *pTable = my_data->device_dispatch_table;
    VkResult result;
    bool threadChecks = startMultiThread();
    if (threadChecks) {
        startReadObject(my_data, device);
        startWriteObject(my_data, pAllocateInfo->commandPool);
    }

    result = pTable->AllocateCommandBuffers(device, pAllocateInfo, pCommandBuffers);
    if (threadChecks) {
        finishReadObject(my_data, device);
        finishWriteObject(my_data, pAllocateInfo->commandPool);
    } else {
        finishMultiThread();
    }

    // Record mapping from command buffer to command pool
    if (VK_SUCCESS == result) {
        for (uint32_t index = 0; index < pAllocateInfo->commandBufferCount; index++) {
            std::lock_guard<std::mutex> lock(command_pool_lock);
            command_pool_map[pCommandBuffers[index]] = pAllocateInfo->commandPool;
        }
    }

    return result;
}

VKAPI_ATTR VkResult VKAPI_CALL AllocateDescriptorSets(VkDevice device, const VkDescriptorSetAllocateInfo *pAllocateInfo,
                                                      VkDescriptorSet *pDescriptorSets) {
    dispatch_key key = get_dispatch_key(device);
    layer_data *my_data = GetLayerDataPtr(key, layer_data_map);
    VkLayerDispatchTable *pTable = my_data->device_dispatch_table;
    VkResult result;
    bool threadChecks = startMultiThread();
    if (threadChecks) {
        startReadObject(my_data, device);
        startWriteObject(my_data, pAllocateInfo->descriptorPool);
        // Host access to pAllocateInfo::descriptorPool must be externally synchronized
    }
    result = pTable->AllocateDescriptorSets(device, pAllocateInfo, pDescriptorSets);
    if (threadChecks) {
        finishReadObject(my_data, device);
        finishWriteObject(my_data, pAllocateInfo->descriptorPool);
        // Host access to pAllocateInfo::descriptorPool must be externally synchronized
    } else {
        finishMultiThread();
    }
    return result;
}

VKAPI_ATTR void VKAPI_CALL FreeCommandBuffers(VkDevice device, VkCommandPool commandPool, uint32_t commandBufferCount,
                                              const VkCommandBuffer *pCommandBuffers) {
    dispatch_key key = get_dispatch_key(device);
    layer_data *my_data = GetLayerDataPtr(key, layer_data_map);
    VkLayerDispatchTable *pTable = my_data->device_dispatch_table;
    const bool lockCommandPool = false;  // pool is already directly locked
    bool threadChecks = startMultiThread();
    if (threadChecks) {
        startReadObject(my_data, device);
        startWriteObject(my_data, commandPool);
        for (uint32_t index = 0; index < commandBufferCount; index++) {
            startWriteObject(my_data, pCommandBuffers[index], lockCommandPool);
        }
        // The driver may immediately reuse command buffers in another thread.
        // These updates need to be done before calling down to the driver.
        for (uint32_t index = 0; index < commandBufferCount; index++) {
            finishWriteObject(my_data, pCommandBuffers[index], lockCommandPool);
            std::lock_guard<std::mutex> lock(command_pool_lock);
            command_pool_map.erase(pCommandBuffers[index]);
        }
    }

    pTable->FreeCommandBuffers(device, commandPool, commandBufferCount, pCommandBuffers);
    if (threadChecks) {
        finishReadObject(my_data, device);
        finishWriteObject(my_data, commandPool);
    } else {
        finishMultiThread();
    }
}

}  // namespace threading

// vk_layer_logging.h expects these to be defined

VKAPI_ATTR VkResult VKAPI_CALL vkCreateDebugReportCallbackEXT(VkInstance instance,
                                                              const VkDebugReportCallbackCreateInfoEXT *pCreateInfo,
                                                              const VkAllocationCallbacks *pAllocator,
                                                              VkDebugReportCallbackEXT *pMsgCallback) {
    return threading::CreateDebugReportCallbackEXT(instance, pCreateInfo, pAllocator, pMsgCallback);
}

VKAPI_ATTR void VKAPI_CALL vkDestroyDebugReportCallbackEXT(VkInstance instance, VkDebugReportCallbackEXT msgCallback,
                                                           const VkAllocationCallbacks *pAllocator) {
    threading::DestroyDebugReportCallbackEXT(instance, msgCallback, pAllocator);
}

VKAPI_ATTR void VKAPI_CALL vkDebugReportMessageEXT(VkInstance instance, VkDebugReportFlagsEXT flags,
                                                   VkDebugReportObjectTypeEXT objType, uint64_t object, size_t location,
                                                   int32_t msgCode, const char *pLayerPrefix, const char *pMsg) {
    threading::DebugReportMessageEXT(instance, flags, objType, object, location, msgCode, pLayerPrefix, pMsg);
}

// loader-layer interface v0, just wrappers since there is only a layer

VK_LAYER_EXPORT VKAPI_ATTR VkResult VKAPI_CALL vkEnumerateInstanceExtensionProperties(const char *pLayerName, uint32_t *pCount,
                                                                                      VkExtensionProperties *pProperties) {
    return threading::EnumerateInstanceExtensionProperties(pLayerName, pCount, pProperties);
}

VK_LAYER_EXPORT VKAPI_ATTR VkResult VKAPI_CALL vkEnumerateInstanceLayerProperties(uint32_t *pCount,
                                                                                  VkLayerProperties *pProperties) {
    return threading::EnumerateInstanceLayerProperties(pCount, pProperties);
}

VK_LAYER_EXPORT VKAPI_ATTR VkResult VKAPI_CALL vkEnumerateDeviceLayerProperties(VkPhysicalDevice physicalDevice, uint32_t *pCount,
                                                                                VkLayerProperties *pProperties) {
    // the layer command handles VK_NULL_HANDLE just fine internally
    assert(physicalDevice == VK_NULL_HANDLE);
    return threading::EnumerateDeviceLayerProperties(VK_NULL_HANDLE, pCount, pProperties);
}

VK_LAYER_EXPORT VKAPI_ATTR VkResult VKAPI_CALL vkEnumerateDeviceExtensionProperties(VkPhysicalDevice physicalDevice,
                                                                                    const char *pLayerName, uint32_t *pCount,
                                                                                    VkExtensionProperties *pProperties) {
    // the layer command handles VK_NULL_HANDLE just fine internally
    assert(physicalDevice == VK_NULL_HANDLE);
    return threading::EnumerateDeviceExtensionProperties(VK_NULL_HANDLE, pLayerName, pCount, pProperties);
}

VK_LAYER_EXPORT VKAPI_ATTR PFN_vkVoidFunction VKAPI_CALL vkGetDeviceProcAddr(VkDevice dev, const char *funcName) {
    return threading::GetDeviceProcAddr(dev, funcName);
}

VK_LAYER_EXPORT VKAPI_ATTR PFN_vkVoidFunction VKAPI_CALL vkGetInstanceProcAddr(VkInstance instance, const char *funcName) {
    return threading::GetInstanceProcAddr(instance, funcName);
}

VK_LAYER_EXPORT VKAPI_ATTR PFN_vkVoidFunction VKAPI_CALL vk_layerGetPhysicalDeviceProcAddr(VkInstance instance,
                                                                                           const char *funcName) {
    return threading::GetPhysicalDeviceProcAddr(instance, funcName);
}

VK_LAYER_EXPORT VKAPI_ATTR VkResult VKAPI_CALL vkNegotiateLoaderLayerInterfaceVersion(VkNegotiateLayerInterface *pVersionStruct) {
    assert(pVersionStruct != NULL);
    assert(pVersionStruct->sType == LAYER_NEGOTIATE_INTERFACE_STRUCT);

    // Fill in the function pointers if our version is at least capable of having the structure contain them.
    if (pVersionStruct->loaderLayerInterfaceVersion >= 2) {
        pVersionStruct->pfnGetInstanceProcAddr = vkGetInstanceProcAddr;
        pVersionStruct->pfnGetDeviceProcAddr = vkGetDeviceProcAddr;
        pVersionStruct->pfnGetPhysicalDeviceProcAddr = vk_layerGetPhysicalDeviceProcAddr;
    }

    if (pVersionStruct->loaderLayerInterfaceVersion < CURRENT_LOADER_LAYER_INTERFACE_VERSION) {
        threading::loader_layer_if_version = pVersionStruct->loaderLayerInterfaceVersion;
    } else if (pVersionStruct->loaderLayerInterfaceVersion > CURRENT_LOADER_LAYER_INTERFACE_VERSION) {
        pVersionStruct->loaderLayerInterfaceVersion = CURRENT_LOADER_LAYER_INTERFACE_VERSION;
    }

    return VK_SUCCESS;
}