/*

 *

 * Copyright (c) 2015-2023 The Khronos Group Inc.

 * Copyright (c) 2015-2023 Valve Corporation

 * Copyright (c) 2015-2023 LunarG, Inc.

 * Copyright (C) 2015 Google Inc.

 * Copyright (c) 2021-2022 NVIDIA CORPORATION & AFFILIATES. All rights reserved.

 * Copyright (c) 2023-2023 RasterGrid Kft.

 *

 * 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.

 *

 * Author: Courtney Goeltzenleuchter <courtney@lunarg.com>

 * Author: Jon Ashburn <jon@lunarg.com>

 * Author: Tony Barbour <tony@LunarG.com>

 * Author: Chia-I Wu <olv@lunarg.com>

 * Author: Charles Giessen <charles@lunarg.com>

 */

#include <stdlib.h>

#include <string.h>

#include "allocation.h"

#include "debug_utils.h"

#include "gpa_helper.h"

#include "loader.h"

#include "loader_environment.h"

#include "log.h"

#include "settings.h"

#include "stack_allocation.h"

#include "vk_loader_extensions.h"

#include "vk_loader_platform.h"

#include "wsi.h"

// Trampoline entrypoints are in this file for core Vulkan commands

/* vkGetInstanceProcAddr: Get global level or instance level entrypoint addresses.

 * @param instance

 * @param pName

 * @return

 *    If pName is a global level entrypoint:

 *        If instance == NULL || instance is invalid || (instance is valid && instance.minor_version <= 2):

 *            return global level functions

 *        Else:

 *            return NULL

 *    Else:

 *        If instance is valid:

 *            return a trampoline entry point for all dispatchable Vulkan functions both core and extensions.

 *        Else:

 *            return NULL

 *

 * Note:

 * Vulkan header updated 1.2.193 changed the behavior of vkGetInstanceProcAddr for global entrypoints. They used to always be

 * returned regardless of the value of the instance parameter. The spec was amended in this version to only allow querying global

 * level entrypoints with a NULL instance. However, as to not break old applications, the new behavior is only applied if the

 * instance passed in is both valid and minor version is greater than 1.2, which was when this change in behavior occurred. Only

 * instances with a newer version will get the new behavior.

 */

LOADER_EXPORT VKAPI_ATTR PFN_vkVoidFunction VKAPI_CALL vkGetInstanceProcAddr(VkInstance instance, const char *pName) {

    // Always should be able to get vkGetInstanceProcAddr if queried, regardless of the value of instance

    if (!strcmp(pName, "vkGetInstanceProcAddr")) return (PFN_vkVoidFunction)vkGetInstanceProcAddr;

    // Get entrypoint addresses that are global (no dispatchable object)

    void *addr = globalGetProcAddr(pName);

    if (addr != VK_NULL_HANDLE) {

        // Always can get a global entrypoint from vkGetInstanceProcAddr with a NULL instance handle

        if (instance == VK_NULL_HANDLE) {

            return addr;

        } else {

            // New behavior only returns a global entrypoint if the instance handle is NULL.

            // Old behavior is to return a global entrypoint regardless of the value of the instance handle.

            // Use new behavior if: The instance is valid and the minor version of the instance is greater than 1.2, which

            // was when the new behavior was added. (eg, it is enforced in the next minor version of vulkan, which will be 1.3)

            // First check if instance is valid - loader_get_instance() returns NULL if it isn't.

            struct loader_instance *ptr_instance = loader_get_instance(instance);

            if (ptr_instance != NULL &&

                loader_check_version_meets_required(loader_combine_version(1, 3, 0), ptr_instance->app_api_version)) {

                // New behavior

                return NULL;

            } else {

                // Old behavior

                return addr;

            }

        }

    } else {

        // All other functions require a valid instance handle to get

        if (instance == VK_NULL_HANDLE) {

            return NULL;

        }

        struct loader_instance *ptr_instance = loader_get_instance(instance);

        // If we've gotten here and the pointer is NULL, it's invalid

        if (ptr_instance == NULL) {

            loader_log(NULL, VULKAN_LOADER_FATAL_ERROR_BIT | VULKAN_LOADER_ERROR_BIT | VULKAN_LOADER_VALIDATION_BIT, 0,

                       "vkGetInstanceProcAddr: Invalid instance [VUID-vkGetInstanceProcAddr-instance-parameter]");

            abort(); /* Intentionally fail so user can correct issue. */

        }

        // Return trampoline code for non-global entrypoints including any extensions.

        // Device extensions are returned if a layer or ICD supports the extension.

        // Instance extensions are returned if the extension is enabled and the

        // loader or someone else supports the extension

        return trampoline_get_proc_addr(ptr_instance, pName);

    }

}

// Get a device level or global level entry point address.

// @param device

// @param pName

// @return

//    If device is valid, returns a device relative entry point for device level

//    entry points both core and extensions.

//    Device relative means call down the device chain.

LOADER_EXPORT VKAPI_ATTR PFN_vkVoidFunction VKAPI_CALL vkGetDeviceProcAddr(VkDevice device, const char *pName) {

    if (!pName || pName[0] != 'v' || pName[1] != 'k') return NULL;

    // For entrypoints that loader must handle (ie non-dispatchable or create object)

    // make sure the loader entrypoint is returned

    const char *name = pName;

    name += 2;

    if (!strcmp(name, "GetDeviceProcAddr")) return (PFN_vkVoidFunction)vkGetDeviceProcAddr;

    if (!strcmp(name, "DestroyDevice")) return (PFN_vkVoidFunction)vkDestroyDevice;

    if (!strcmp(name, "GetDeviceQueue")) return (PFN_vkVoidFunction)vkGetDeviceQueue;

    if (!strcmp(name, "AllocateCommandBuffers")) return (PFN_vkVoidFunction)vkAllocateCommandBuffers;

    // Although CreateDevice is on device chain it's dispatchable object isn't

    // a VkDevice or child of VkDevice so return NULL.

    if (!strcmp(pName, "CreateDevice")) return NULL;

    // Because vkGetDeviceQueue2 is a 1.1 entry point, we need to check if the apiVersion provided during instance creation is

    // sufficient

    if (!strcmp(name, "GetDeviceQueue2")) {

        struct loader_device *dev = NULL;

        struct loader_icd_term *icd_term = loader_get_icd_and_device(device, &dev);

        if (NULL != icd_term && dev != NULL) {

            const struct loader_instance *inst = icd_term->this_instance;

            uint32_t api_version =

                VK_MAKE_API_VERSION(0, inst->app_api_version.major, inst->app_api_version.minor, inst->app_api_version.patch);

            return (dev->should_ignore_device_commands_from_newer_version && api_version < VK_API_VERSION_1_1)

                       ? NULL

                       : (PFN_vkVoidFunction)vkGetDeviceQueue2;

        }

        return NULL;

    }

    // Return the dispatch table entrypoint for the fastest case

    const VkLayerDispatchTable *disp_table = loader_get_dispatch(device);

    if (disp_table == NULL) return NULL;

    bool found_name = false;

    void *addr = loader_lookup_device_dispatch_table(disp_table, pName, &found_name);

    if (found_name) return addr;

    if (disp_table->GetDeviceProcAddr == NULL) return NULL;

    return disp_table->GetDeviceProcAddr(device, pName);

}

LOADER_EXPORT VKAPI_ATTR VkResult VKAPI_CALL vkEnumerateInstanceExtensionProperties(const char *pLayerName,

                                                                                    uint32_t *pPropertyCount,

                                                                                    VkExtensionProperties *pProperties) {

    LOADER_PLATFORM_THREAD_ONCE(&once_init, loader_initialize);

    update_global_loader_settings();

    // We know we need to call at least the terminator

    VkResult res = VK_SUCCESS;

    VkEnumerateInstanceExtensionPropertiesChain chain_tail = {

        .header =

            {

                .type = VK_CHAIN_TYPE_ENUMERATE_INSTANCE_EXTENSION_PROPERTIES,

                .version = VK_CURRENT_CHAIN_VERSION,

                .size = sizeof(chain_tail),

            },

        .pfnNextLayer = &terminator_pre_instance_EnumerateInstanceExtensionProperties,

        .pNextLink = NULL,

    };

    VkEnumerateInstanceExtensionPropertiesChain *chain_head = &chain_tail;

    // Get the implicit layers

    struct loader_layer_list layers = {0};

    memset(&layers, 0, sizeof(layers));

    struct loader_envvar_all_filters layer_filters = {0};

    res = parse_layer_environment_var_filters(NULL, &layer_filters);

    if (VK_SUCCESS != res) {

        return res;

    }

    res = loader_scan_for_implicit_layers(NULL, &layers, &layer_filters);

    if (VK_SUCCESS != res) {

        return res;

    }

    // Prepend layers onto the chain if they implement this entry point

    for (uint32_t i = 0; i < layers.count; ++i) {

        // Skip this layer if it doesn't expose the entry-point

        if (NULL == layers.list[i].pre_instance_functions.enumerate_instance_extension_properties) {

            continue;

        }

        loader_open_layer_file(NULL, &layers.list[i]);

        if (layers.list[i].lib_handle == NULL) {

            continue;

        }

        void *pfn = loader_platform_get_proc_address(layers.list[i].lib_handle,

                                                     layers.list[i].pre_instance_functions.enumerate_instance_extension_properties);

        if (pfn == NULL) {

            loader_log(NULL, VULKAN_LOADER_WARN_BIT | VULKAN_LOADER_LAYER_BIT, 0,

                       "%s: Unable to resolve symbol \"%s\" in implicit layer library \"%s\"", __FUNCTION__,

                       layers.list[i].pre_instance_functions.enumerate_instance_extension_properties, layers.list[i].lib_name);

            continue;

        }

        VkEnumerateInstanceExtensionPropertiesChain *chain_link =

            loader_alloc(NULL, sizeof(VkEnumerateInstanceExtensionPropertiesChain), VK_SYSTEM_ALLOCATION_SCOPE_COMMAND);

        if (chain_link == NULL) {

            res = VK_ERROR_OUT_OF_HOST_MEMORY;

            break;

        }

        memset(chain_link, 0, sizeof(VkEnumerateInstanceLayerPropertiesChain));

        chain_link->header.type = VK_CHAIN_TYPE_ENUMERATE_INSTANCE_EXTENSION_PROPERTIES;

        chain_link->header.version = VK_CURRENT_CHAIN_VERSION;

        chain_link->header.size = sizeof(*chain_link);

        chain_link->pfnNextLayer = pfn;

        chain_link->pNextLink = chain_head;

        chain_head = chain_link;

    }

    // Call down the chain

    if (res == VK_SUCCESS) {

        res = chain_head->pfnNextLayer(chain_head->pNextLink, pLayerName, pPropertyCount, pProperties);

    }

    // Free up the layers

    loader_delete_layer_list_and_properties(NULL, &layers);

    // Tear down the chain

    while (chain_head != &chain_tail) {

        VkEnumerateInstanceExtensionPropertiesChain *holder = chain_head;

        chain_head = (VkEnumerateInstanceExtensionPropertiesChain *)chain_head->pNextLink;

        loader_free(NULL, holder);

    }

    return res;

}

LOADER_EXPORT VKAPI_ATTR VkResult VKAPI_CALL vkEnumerateInstanceLayerProperties(uint32_t *pPropertyCount,

                                                                                VkLayerProperties *pProperties) {

    LOADER_PLATFORM_THREAD_ONCE(&once_init, loader_initialize);

    update_global_loader_settings();

    // We know we need to call at least the terminator

    VkResult res = VK_SUCCESS;

    VkEnumerateInstanceLayerPropertiesChain chain_tail = {

        .header =

            {

                .type = VK_CHAIN_TYPE_ENUMERATE_INSTANCE_LAYER_PROPERTIES,

                .version = VK_CURRENT_CHAIN_VERSION,

                .size = sizeof(chain_tail),

            },

        .pfnNextLayer = &terminator_pre_instance_EnumerateInstanceLayerProperties,

        .pNextLink = NULL,

    };

    VkEnumerateInstanceLayerPropertiesChain *chain_head = &chain_tail;

    // Get the implicit layers

    struct loader_layer_list layers;

    memset(&layers, 0, sizeof(layers));

    struct loader_envvar_all_filters layer_filters = {0};

    res = parse_layer_environment_var_filters(NULL, &layer_filters);

    if (VK_SUCCESS != res) {

        return res;

    }

    res = loader_scan_for_implicit_layers(NULL, &layers, &layer_filters);

    if (VK_SUCCESS != res) {

        return res;

    }

    // Prepend layers onto the chain if they implement this entry point

    for (uint32_t i = 0; i < layers.count; ++i) {

        // Skip this layer if it doesn't expose the entry-point

        if (NULL == layers.list[i].pre_instance_functions.enumerate_instance_layer_properties) {

            continue;

        }

        loader_open_layer_file(NULL, &layers.list[i]);

        if (layers.list[i].lib_handle == NULL) {

            continue;

        }

        void *pfn = loader_platform_get_proc_address(layers.list[i].lib_handle,

                                                     layers.list[i].pre_instance_functions.enumerate_instance_layer_properties);

        if (pfn == NULL) {

            loader_log(NULL, VULKAN_LOADER_WARN_BIT, 0, "%s: Unable to resolve symbol \"%s\" in implicit layer library \"%s\"",

                       __FUNCTION__, layers.list[i].pre_instance_functions.enumerate_instance_layer_properties,

                       layers.list[i].lib_name);

            continue;

        }

        VkEnumerateInstanceLayerPropertiesChain *chain_link =

            loader_alloc(NULL, sizeof(VkEnumerateInstanceLayerPropertiesChain), VK_SYSTEM_ALLOCATION_SCOPE_COMMAND);

        if (chain_link == NULL) {

            res = VK_ERROR_OUT_OF_HOST_MEMORY;

            break;

        }

        memset(chain_link, 0, sizeof(VkEnumerateInstanceLayerPropertiesChain));

        chain_link->header.type = VK_CHAIN_TYPE_ENUMERATE_INSTANCE_LAYER_PROPERTIES;

        chain_link->header.version = VK_CURRENT_CHAIN_VERSION;

        chain_link->header.size = sizeof(*chain_link);

        chain_link->pfnNextLayer = pfn;

        chain_link->pNextLink = chain_head;

        chain_head = chain_link;

    }

    // Call down the chain

    if (res == VK_SUCCESS) {

        res = chain_head->pfnNextLayer(chain_head->pNextLink, pPropertyCount, pProperties);

    }

    // Free up the layers

    loader_delete_layer_list_and_properties(NULL, &layers);

    // Tear down the chain

    while (chain_head != &chain_tail) {

        VkEnumerateInstanceLayerPropertiesChain *holder = chain_head;

        chain_head = (VkEnumerateInstanceLayerPropertiesChain *)chain_head->pNextLink;

        loader_free(NULL, holder);

    }

    return res;

}

LOADER_EXPORT VKAPI_ATTR VkResult VKAPI_CALL vkEnumerateInstanceVersion(uint32_t *pApiVersion) {

    LOADER_PLATFORM_THREAD_ONCE(&once_init, loader_initialize);

    update_global_loader_settings();

    if (NULL == pApiVersion) {

        loader_log(NULL, VULKAN_LOADER_FATAL_ERROR_BIT | VULKAN_LOADER_ERROR_BIT | VULKAN_LOADER_VALIDATION_BIT, 0,

                   "vkEnumerateInstanceVersion: \'pApiVersion\' must not be NULL "

                   "(VUID-vkEnumerateInstanceVersion-pApiVersion-parameter");

        // NOTE: This seems silly, but it's the only allowable failure

        return VK_ERROR_OUT_OF_HOST_MEMORY;

    }

    // We know we need to call at least the terminator

    VkResult res = VK_SUCCESS;

    VkEnumerateInstanceVersionChain chain_tail = {

        .header =

            {

                .type = VK_CHAIN_TYPE_ENUMERATE_INSTANCE_VERSION,

                .version = VK_CURRENT_CHAIN_VERSION,

                .size = sizeof(chain_tail),

            },

        .pfnNextLayer = &terminator_pre_instance_EnumerateInstanceVersion,

        .pNextLink = NULL,

    };

    VkEnumerateInstanceVersionChain *chain_head = &chain_tail;

    // Get the implicit layers

    struct loader_layer_list layers;

    memset(&layers, 0, sizeof(layers));

    struct loader_envvar_all_filters layer_filters = {0};

    res = parse_layer_environment_var_filters(NULL, &layer_filters);

    if (VK_SUCCESS != res) {

        return res;

    }

    res = loader_scan_for_implicit_layers(NULL, &layers, &layer_filters);

    if (VK_SUCCESS != res) {

        return res;

    }

    // Prepend layers onto the chain if they implement this entry point

    for (uint32_t i = 0; i < layers.count; ++i) {

        // Skip this layer if it doesn't expose the entry-point

        if (NULL == layers.list[i].pre_instance_functions.enumerate_instance_version) {

            continue;

        }

        loader_open_layer_file(NULL, &layers.list[i]);

        if (layers.list[i].lib_handle == NULL) {

            continue;

        }

        void *pfn = loader_platform_get_proc_address(layers.list[i].lib_handle,

                                                     layers.list[i].pre_instance_functions.enumerate_instance_version);

        if (pfn == NULL) {

            loader_log(NULL, VULKAN_LOADER_WARN_BIT, 0, "%s: Unable to resolve symbol \"%s\" in implicit layer library \"%s\"",

                       __FUNCTION__, layers.list[i].pre_instance_functions.enumerate_instance_version, layers.list[i].lib_name);

            continue;

        }

        VkEnumerateInstanceVersionChain *chain_link =

            loader_alloc(NULL, sizeof(VkEnumerateInstanceVersionChain), VK_SYSTEM_ALLOCATION_SCOPE_COMMAND);

        if (chain_link == NULL) {

            res = VK_ERROR_OUT_OF_HOST_MEMORY;

            break;

        }

        memset(chain_link, 0, sizeof(VkEnumerateInstanceLayerPropertiesChain));

        chain_link->header.type = VK_CHAIN_TYPE_ENUMERATE_INSTANCE_VERSION;

        chain_link->header.version = VK_CURRENT_CHAIN_VERSION;

        chain_link->header.size = sizeof(*chain_link);

        chain_link->pfnNextLayer = pfn;

        chain_link->pNextLink = chain_head;

        chain_head = chain_link;

    }

    // Call down the chain

    if (res == VK_SUCCESS) {

        res = chain_head->pfnNextLayer(chain_head->pNextLink, pApiVersion);

    }

    // Free up the layers

    loader_delete_layer_list_and_properties(NULL, &layers);

    // Tear down the chain

    while (chain_head != &chain_tail) {

        VkEnumerateInstanceVersionChain *holder = chain_head;

        chain_head = (VkEnumerateInstanceVersionChain *)chain_head->pNextLink;

        loader_free(NULL, holder);

    }

    return res;

}

// Add the "instance-only" debug functions to the list of active debug functions

// at the very end.  This way it doesn't get replaced by any new messengers

void loader_add_instance_only_debug_funcs(struct loader_instance *ptr_instance) {

    VkLayerDbgFunctionNode *cur_node = ptr_instance->current_dbg_function_head;

    if (cur_node == NULL) {

        ptr_instance->current_dbg_function_head = ptr_instance->instance_only_dbg_function_head;

    } else {

        while (cur_node != NULL) {

            if (cur_node == ptr_instance->instance_only_dbg_function_head) {

                // Already added

                break;

            }

            // Last item

            else if (cur_node->pNext == NULL) {

                cur_node->pNext = ptr_instance->instance_only_dbg_function_head;

            }

            cur_node = cur_node->pNext;

        }

    }

}

// Remove the "instance-only" debug functions from the list of active debug functions.

// It should be added after the last actual debug utils/debug report function.

void loader_remove_instance_only_debug_funcs(struct loader_instance *ptr_instance) {

    VkLayerDbgFunctionNode *cur_node = ptr_instance->current_dbg_function_head;

    // Only thing in list is the instance only head

    if (cur_node == ptr_instance->instance_only_dbg_function_head) {

        ptr_instance->current_dbg_function_head = NULL;

    }

    while (cur_node != NULL) {

        if (cur_node->pNext == ptr_instance->instance_only_dbg_function_head) {

            cur_node->pNext = NULL;

            break;

        }

        cur_node = cur_node->pNext;

    }

}

LOADER_EXPORT VKAPI_ATTR VkResult VKAPI_CALL vkCreateInstance(const VkInstanceCreateInfo *pCreateInfo,

                                                              const VkAllocationCallbacks *pAllocator, VkInstance *pInstance) {

    struct loader_instance *ptr_instance = NULL;

    VkInstance created_instance = VK_NULL_HANDLE;

    VkResult res = VK_ERROR_INITIALIZATION_FAILED;

    VkInstanceCreateInfo ici = {0};

    bool portability_enumeration_flag_bit_set = false;

    bool portability_enumeration_extension_enabled = false;

    struct loader_envvar_all_filters layer_filters = {0};

    LOADER_PLATFORM_THREAD_ONCE(&once_init, loader_initialize);

    if (pCreateInfo == NULL) {

        loader_log(NULL, VULKAN_LOADER_FATAL_ERROR_BIT | VULKAN_LOADER_ERROR_BIT | VULKAN_LOADER_VALIDATION_BIT, 0,

                   "vkCreateInstance: \'pCreateInfo\' is NULL (VUID-vkCreateInstance-pCreateInfo-parameter)");

        goto out;

    }

    ici = *pCreateInfo;

    if (pInstance == NULL) {

        loader_log(NULL, VULKAN_LOADER_FATAL_ERROR_BIT | VULKAN_LOADER_ERROR_BIT | VULKAN_LOADER_VALIDATION_BIT, 0,

                   "vkCreateInstance \'pInstance\' not valid (VUID-vkCreateInstance-pInstance-parameter)");

        goto out;

    }

    ptr_instance =

        (struct loader_instance *)loader_calloc(pAllocator, sizeof(struct loader_instance), VK_SYSTEM_ALLOCATION_SCOPE_INSTANCE);

    if (ptr_instance == NULL) {

        res = VK_ERROR_OUT_OF_HOST_MEMORY;

        goto out;

    }

    loader_platform_thread_lock_mutex(&loader_lock);

    if (pAllocator) {

        ptr_instance->alloc_callbacks = *pAllocator;

    }

    ptr_instance->magic = LOADER_MAGIC_NUMBER;

    // Save the application version

    if (NULL == pCreateInfo->pApplicationInfo || 0 == pCreateInfo->pApplicationInfo->apiVersion) {

        ptr_instance->app_api_version = LOADER_VERSION_1_0_0;

    } else {

        ptr_instance->app_api_version = loader_make_version(pCreateInfo->pApplicationInfo->apiVersion);

    }

    // Look for one or more VK_EXT_debug_report or VK_EXT_debug_utils create info structures

    // and setup a callback(s) for each one found.

    // Handle cases of VK_EXT_debug_utils

    // Setup the temporary messenger(s) here to catch early issues:

    res = util_CreateDebugUtilsMessengers(ptr_instance, pCreateInfo->pNext, pAllocator);

    if (VK_ERROR_OUT_OF_HOST_MEMORY == res) {

        // Failure of setting up one or more of the messenger.

        goto out;

    }

    // Handle cases of VK_EXT_debug_report

    // Setup the temporary callback(s) here to catch early issues:

    res = util_CreateDebugReportCallbacks(ptr_instance, pCreateInfo->pNext, pAllocator);

    if (VK_ERROR_OUT_OF_HOST_MEMORY == res) {

        // Failure of setting up one or more of the callback.

        goto out;

    }

    VkResult settings_file_res = get_loader_settings(ptr_instance, &ptr_instance->settings);

    if (settings_file_res == VK_ERROR_OUT_OF_HOST_MEMORY) {

        res = settings_file_res;

        goto out;

    }

    if (ptr_instance->settings.settings_active) {

        log_settings(ptr_instance, &ptr_instance->settings);

    }

    // Providing an apiVersion less than VK_API_VERSION_1_0 but greater than zero prevents the validation layers from starting

    if (pCreateInfo->pApplicationInfo && pCreateInfo->pApplicationInfo->apiVersion != 0u &&

        pCreateInfo->pApplicationInfo->apiVersion < VK_API_VERSION_1_0) {

        loader_log(ptr_instance, VULKAN_LOADER_FATAL_ERROR_BIT | VULKAN_LOADER_ERROR_BIT, 0,

                   "VkInstanceCreateInfo::pApplicationInfo::apiVersion has value of %u which is not permitted. If apiVersion is "

                   "not 0, then it must be "

                   "greater than or equal to the value of VK_API_VERSION_1_0 [VUID-VkApplicationInfo-apiVersion]",

                   pCreateInfo->pApplicationInfo->apiVersion);

    }

    // Check the VkInstanceCreateInfoFlags wether to allow the portability enumeration flag

    if ((pCreateInfo->flags & VK_INSTANCE_CREATE_ENUMERATE_PORTABILITY_BIT_KHR) == 1) {

        portability_enumeration_flag_bit_set = true;

    }

    // Make sure the portability extension extension has been enabled before enabling portability driver enumeration

    if (pCreateInfo->ppEnabledExtensionNames) {

        for (uint32_t i = 0; i < pCreateInfo->enabledExtensionCount; i++) {

            if (strcmp(pCreateInfo->ppEnabledExtensionNames[i], VK_KHR_PORTABILITY_ENUMERATION_EXTENSION_NAME) == 0) {

                portability_enumeration_extension_enabled = true;

                if (portability_enumeration_flag_bit_set) {

                    ptr_instance->portability_enumeration_enabled = true;

                    loader_log(ptr_instance, VULKAN_LOADER_INFO_BIT, 0,

                               "Portability enumeration bit was set, enumerating portability drivers.");

                }

                break;

            }

        }

    }

    // Make sure the application provided API version has the correct variant

    if (NULL != pCreateInfo->pApplicationInfo) {

        uint32_t variant_version = VK_API_VERSION_VARIANT(pCreateInfo->pApplicationInfo->apiVersion);

        const uint32_t expected_variant = 0;

        if (expected_variant != variant_version) {

            loader_log(ptr_instance, VULKAN_LOADER_WARN_BIT, 0,

                       "vkCreateInstance: The API Variant specified in pCreateInfo->pApplicationInfo.apiVersion is %d instead of "

                       "the expected value of %d.",

                       variant_version, expected_variant);

        }

    }

    res = parse_layer_environment_var_filters(ptr_instance, &layer_filters);

    if (VK_SUCCESS != res) {

        goto out;

    }

    // Due to implicit layers need to get layer list even if

    // enabledLayerCount == 0 and VK_INSTANCE_LAYERS is unset. For now always

    // get layer list via loader_scan_for_layers().

    memset(&ptr_instance->instance_layer_list, 0, sizeof(ptr_instance->instance_layer_list));

    res = loader_scan_for_layers(ptr_instance, &ptr_instance->instance_layer_list, &layer_filters);

    if (VK_SUCCESS != res) {

        goto out;

    }

    // Validate the app requested layers to be enabled

    if (pCreateInfo->enabledLayerCount > 0) {

        res = loader_validate_layers(ptr_instance, pCreateInfo->enabledLayerCount, pCreateInfo->ppEnabledLayerNames,

                                     &ptr_instance->instance_layer_list);

        if (res != VK_SUCCESS) {

            goto out;

        }

    }

    // Scan/discover all System and Environment Variable ICD libraries

    bool skipped_portability_drivers = false;

    res = loader_icd_scan(ptr_instance, &ptr_instance->icd_tramp_list, pCreateInfo, &skipped_portability_drivers);

    if (res == VK_ERROR_OUT_OF_HOST_MEMORY) {

        goto out;

    }

    if (ptr_instance->icd_tramp_list.count == 0) {

        // No drivers found

        if (skipped_portability_drivers) {

            if (portability_enumeration_extension_enabled && !portability_enumeration_flag_bit_set) {

                loader_log(ptr_instance, VULKAN_LOADER_ERROR_BIT | VULKAN_LOADER_DRIVER_BIT, 0,

                           "vkCreateInstance: Found drivers that contain devices which support the portability subset, but "

                           "the instance does not enumerate portability drivers! Applications that wish to enumerate portability "

                           "drivers must set the VK_INSTANCE_CREATE_ENUMERATE_PORTABILITY_BIT_KHR bit in the VkInstanceCreateInfo "

                           "flags.");

            } else if (portability_enumeration_flag_bit_set && !portability_enumeration_extension_enabled) {

                loader_log(ptr_instance, VULKAN_LOADER_ERROR_BIT | VULKAN_LOADER_DRIVER_BIT, 0,

                           "VkInstanceCreateInfo: If flags has the VK_INSTANCE_CREATE_ENUMERATE_PORTABILITY_BIT_KHR bit set, the "

                           "list of enabled extensions in ppEnabledExtensionNames must contain VK_KHR_portability_enumeration "

                           "[VUID-VkInstanceCreateInfo-flags-06559 ]"

                           "Applications that wish to enumerate portability drivers must enable the VK_KHR_portability_enumeration "

                           "instance extension.");

            } else {

                loader_log(ptr_instance, VULKAN_LOADER_ERROR_BIT | VULKAN_LOADER_DRIVER_BIT, 0,

                           "vkCreateInstance: Found drivers that contain devices which support the portability subset, but "

                           "the instance does not enumerate portability drivers! Applications that wish to enumerate portability "

                           "drivers must set the VK_INSTANCE_CREATE_ENUMERATE_PORTABILITY_BIT_KHR bit in the VkInstanceCreateInfo "

                           "flags and enable the VK_KHR_portability_enumeration instance extension.");

            }

        }

        loader_log(ptr_instance, VULKAN_LOADER_ERROR_BIT | VULKAN_LOADER_DRIVER_BIT, 0, "vkCreateInstance: Found no drivers!");

        res = VK_ERROR_INCOMPATIBLE_DRIVER;

        goto out;

    }

    // Get extensions from all ICD's, merge so no duplicates, then validate

    res = loader_get_icd_loader_instance_extensions(ptr_instance, &ptr_instance->icd_tramp_list, &ptr_instance->ext_list);

    if (res != VK_SUCCESS) {

        goto out;

    }

    res = loader_validate_instance_extensions(ptr_instance, &ptr_instance->ext_list, &ptr_instance->instance_layer_list,

                                              &layer_filters, &ici);

    if (res != VK_SUCCESS) {

        goto out;

    }

    ptr_instance->disp = loader_instance_heap_alloc(ptr_instance, sizeof(struct loader_instance_dispatch_table),

                                                    VK_SYSTEM_ALLOCATION_SCOPE_INSTANCE);

    if (ptr_instance->disp == NULL) {

        loader_log(ptr_instance, VULKAN_LOADER_ERROR_BIT, 0,

                   "vkCreateInstance:  Failed to allocate Loader's full Instance dispatch table.");

        res = VK_ERROR_OUT_OF_HOST_MEMORY;

        goto out;

    }

    memcpy(&ptr_instance->disp->layer_inst_disp, &instance_disp, sizeof(instance_disp));

    loader_platform_thread_lock_mutex(&loader_global_instance_list_lock);

    ptr_instance->next = loader.instances;

    loader.instances = ptr_instance;

    loader_platform_thread_unlock_mutex(&loader_global_instance_list_lock);

    // Activate any layers on instance chain

    res = loader_enable_instance_layers(ptr_instance, &ici, &ptr_instance->instance_layer_list, &layer_filters);

    if (res != VK_SUCCESS) {

        goto out;

    }

    created_instance = (VkInstance)ptr_instance;

    res = loader_create_instance_chain(&ici, pAllocator, ptr_instance, &created_instance);

    if (VK_SUCCESS == res) {

        // Check for enabled extensions here to setup the loader structures so the loader knows what extensions

        // it needs to worry about.

        // We do it in the terminator and again above the layers here since we may think different extensions

        // are enabled than what's down in the terminator.

        // This is why we don't clear inside of these function calls.

        // The clearing should actually be handled by the overall memset of the pInstance structure above.

        fill_out_enabled_instance_extensions(ici.enabledExtensionCount, ici.ppEnabledExtensionNames,

                                             &ptr_instance->enabled_extensions);

        *pInstance = (VkInstance)ptr_instance;

        // Finally have the layers in place and everyone has seen

        // the CreateInstance command go by. This allows the layer's

        // GetInstanceProcAddr functions to return valid extension functions

        // if enabled.

        loader_activate_instance_layer_extensions(ptr_instance, created_instance);

        ptr_instance->instance_finished_creation = true;

    } else if (VK_ERROR_EXTENSION_NOT_PRESENT == res && !ptr_instance->create_terminator_invalid_extension) {

        loader_log(ptr_instance, VULKAN_LOADER_WARN_BIT, 0,

                   "vkCreateInstance: Layer returning invalid extension error not triggered by ICD/Loader (Policy #LLP_LAYER_17).");

    }

out:

    if (NULL != ptr_instance) {

        if (res != VK_SUCCESS) {

            loader_platform_thread_lock_mutex(&loader_global_instance_list_lock);

            // error path, should clean everything up

            if (loader.instances == ptr_instance) {

                loader.instances = ptr_instance->next;

            }

            loader_platform_thread_unlock_mutex(&loader_global_instance_list_lock);

            free_loader_settings(ptr_instance, &ptr_instance->settings);

            loader_destroy_generic_list(ptr_instance, (struct loader_generic_list *)&ptr_instance->surfaces_list);

            loader_destroy_generic_list(ptr_instance, (struct loader_generic_list *)&ptr_instance->debug_utils_messengers_list);

            loader_destroy_generic_list(ptr_instance, (struct loader_generic_list *)&ptr_instance->debug_report_callbacks_list);

            loader_instance_heap_free(ptr_instance, ptr_instance->disp);

            // Remove any created VK_EXT_debug_report or VK_EXT_debug_utils items

            destroy_debug_callbacks_chain(ptr_instance, pAllocator);

            loader_destroy_pointer_layer_list(ptr_instance, &ptr_instance->expanded_activated_layer_list);

            loader_destroy_pointer_layer_list(ptr_instance, &ptr_instance->app_activated_layer_list);

            loader_delete_layer_list_and_properties(ptr_instance, &ptr_instance->instance_layer_list);

            loader_clear_scanned_icd_list(ptr_instance, &ptr_instance->icd_tramp_list);

            loader_destroy_generic_list(ptr_instance, (struct loader_generic_list *)&ptr_instance->ext_list);

            // Free any icd_terms that were created.

            // If an OOM occurs from a layer, terminator_CreateInstance won't be reached where this kind of

            // cleanup normally occurs

            struct loader_icd_term *icd_term = NULL;

            while (NULL != ptr_instance->icd_terms) {

                icd_term = ptr_instance->icd_terms;

                // Call destroy Instance on each driver in case we successfully called down the chain but failed on

                // our way back out of it.

                if (icd_term->instance) {

                    loader_icd_close_objects(ptr_instance, icd_term);

                    icd_term->dispatch.DestroyInstance(icd_term->instance, pAllocator);

                }

                icd_term->instance = VK_NULL_HANDLE;

                ptr_instance->icd_terms = icd_term->next;

                loader_icd_destroy(ptr_instance, icd_term, pAllocator);

            }

            free_string_list(ptr_instance, &ptr_instance->enabled_layer_names);

            loader_instance_heap_free(ptr_instance, ptr_instance);

        } else {

            // success path, swap out created debug callbacks out so they aren't used until instance destruction

            loader_remove_instance_only_debug_funcs(ptr_instance);

        }

        // Only unlock when ptr_instance isn't NULL, as if it is, the above code didn't make it to when loader_lock was locked.

        loader_platform_thread_unlock_mutex(&loader_lock);

    }

    return res;

}

LOADER_EXPORT VKAPI_ATTR void VKAPI_CALL vkDestroyInstance(VkInstance instance, const VkAllocationCallbacks *pAllocator) {

    const VkLayerInstanceDispatchTable *disp;

    struct loader_instance *ptr_instance = NULL;

    if (instance == VK_NULL_HANDLE) {

        return;

    }

    loader_platform_thread_lock_mutex(&loader_lock);

    ptr_instance = loader_get_instance(instance);

    if (ptr_instance == NULL) {

        loader_log(NULL, VULKAN_LOADER_FATAL_ERROR_BIT | VULKAN_LOADER_ERROR_BIT | VULKAN_LOADER_VALIDATION_BIT, 0,

                   "vkDestroyInstance: Invalid instance [VUID-vkDestroyInstance-instance-parameter]");

        loader_platform_thread_unlock_mutex(&loader_lock);

        abort(); /* Intentionally fail so user can correct issue. */

    }

    if (pAllocator) {

        ptr_instance->alloc_callbacks = *pAllocator;

    }

    // Remove any callbacks that weren't cleaned up by the application

    destroy_debug_callbacks_chain(ptr_instance, pAllocator);

    // Swap in the debug callbacks created during instance creation

    loader_add_instance_only_debug_funcs(ptr_instance);

    disp = loader_get_instance_layer_dispatch(instance);

    disp->DestroyInstance(ptr_instance->instance, pAllocator);

    free_loader_settings(ptr_instance, &ptr_instance->settings);

    loader_destroy_generic_list(ptr_instance, (struct loader_generic_list *)&ptr_instance->surfaces_list);

    loader_destroy_generic_list(ptr_instance, (struct loader_generic_list *)&ptr_instance->debug_utils_messengers_list);

    loader_destroy_generic_list(ptr_instance, (struct loader_generic_list *)&ptr_instance->debug_report_callbacks_list);

    loader_destroy_pointer_layer_list(ptr_instance, &ptr_instance->expanded_activated_layer_list);

    loader_destroy_pointer_layer_list(ptr_instance, &ptr_instance->app_activated_layer_list);

    loader_delete_layer_list_and_properties(ptr_instance, &ptr_instance->instance_layer_list);

    free_string_list(ptr_instance, &ptr_instance->enabled_layer_names);

    if (ptr_instance->phys_devs_tramp) {

        for (uint32_t i = 0; i < ptr_instance->phys_dev_count_tramp; i++) {

            loader_instance_heap_free(ptr_instance, ptr_instance->phys_devs_tramp[i]);

        }

        loader_instance_heap_free(ptr_instance, ptr_instance->phys_devs_tramp);

    }

    // Destroy the debug callbacks created during instance creation

    destroy_debug_callbacks_chain(ptr_instance, pAllocator);

    loader_instance_heap_free(ptr_instance, ptr_instance->disp);

    loader_instance_heap_free(ptr_instance, ptr_instance);

    loader_platform_thread_unlock_mutex(&loader_lock);

    // Unload preloaded layers, so if vkEnumerateInstanceExtensionProperties or vkCreateInstance is called again, the ICD's are

    // up to date

    loader_unload_preloaded_icds();

}

LOADER_EXPORT VKAPI_ATTR VkResult VKAPI_CALL vkEnumeratePhysicalDevices(VkInstance instance, uint32_t *pPhysicalDeviceCount,

                                                                        VkPhysicalDevice *pPhysicalDevices) {

    VkResult res = VK_SUCCESS;

    struct loader_instance *inst;

    loader_platform_thread_lock_mutex(&loader_lock);

    inst = loader_get_instance(instance);

    if (NULL == inst) {

        loader_log(NULL, VULKAN_LOADER_FATAL_ERROR_BIT | VULKAN_LOADER_ERROR_BIT | VULKAN_LOADER_VALIDATION_BIT, 0,

                   "vkEnumeratePhysicalDevices: Invalid instance [VUID-vkEnumeratePhysicalDevices-instance-parameter]");

        abort(); /* Intentionally fail so user can correct issue. */

    }

    if (NULL == pPhysicalDeviceCount) {

        loader_log(inst, VULKAN_LOADER_FATAL_ERROR_BIT | VULKAN_LOADER_ERROR_BIT | VULKAN_LOADER_VALIDATION_BIT, 0,

                   "vkEnumeratePhysicalDevices: Received NULL pointer for physical device count return value. "

                   "[VUID-vkEnumeratePhysicalDevices-pPhysicalDeviceCount-parameter]");

        res = VK_ERROR_INITIALIZATION_FAILED;

        goto out;

    }

    struct loader_envvar_id_filter device_id_filter;

    struct loader_envvar_id_filter vendor_id_filter;

    struct loader_envvar_id_filter driver_id_filter;

    parse_id_filter_environment_var(inst, VK_DEVICE_ID_FILTER_ENV_VAR, &device_id_filter);

    parse_id_filter_environment_var(inst, VK_VENDOR_ID_FILTER_ENV_VAR, &vendor_id_filter);

    parse_id_filter_environment_var(inst, VK_DRIVER_ID_FILTER_ENV_VAR, &driver_id_filter);

    // Call down the chain to get the physical device info

    if ((0 == device_id_filter.count) && (0 == vendor_id_filter.count) && (0 == driver_id_filter.count)) {

        res = inst->disp->layer_inst_disp.EnumeratePhysicalDevices(inst->instance, pPhysicalDeviceCount, pPhysicalDevices);

    } else {

        uint32_t physical_device_count = 0;

        res = inst->disp->layer_inst_disp.EnumeratePhysicalDevices(inst->instance, &physical_device_count, NULL);

        if (res != VK_SUCCESS) {

            goto out;

        }

        VkPhysicalDevice *physical_devices = loader_stack_alloc(physical_device_count * sizeof(VkPhysicalDevice));

        res = inst->disp->layer_inst_disp.EnumeratePhysicalDevices(inst->instance, &physical_device_count, physical_devices);

        if (res != VK_SUCCESS) {

            goto out;

        }

        res = loader_filter_enumerated_physical_device(inst, &device_id_filter, &vendor_id_filter, &driver_id_filter,

                                                       physical_device_count, physical_devices, pPhysicalDeviceCount,

                                                       pPhysicalDevices);

    }

    if (NULL != pPhysicalDevices && (VK_SUCCESS == res || VK_INCOMPLETE == res)) {

        // Wrap the PhysDev object for loader usage, return wrapped objects

        VkResult update_res = setup_loader_tramp_phys_devs(inst, *pPhysicalDeviceCount, pPhysicalDevices);

        if (VK_SUCCESS != update_res) {

            res = update_res;

        }

        // Unloads any drivers that do not expose any physical devices - should save some address space

        unload_drivers_without_physical_devices(inst);

    }

out:

    loader_platform_thread_unlock_mutex(&loader_lock);

    return res;