vulkan: Expand cases where can_get_driver_info is true

VK_KHR_driver_properties requires VK_KHR_get_physical_device_properties2
extension.  For Vulkan 1.2 both extensions are core, so nothing to do,
for Vulkan 1.1, the latter is core, so only need the former.  For Vulkan
1.0 both extensions are required.

VK_KHR_driver_properties is a device extension that doesn't need to be
explicitly enabled here.  As long as its supported it can be used in the
query on the physical device, before the logical device is created (i.e.
before device extensions can be enabled).  See
https://registry.khronos.org/vulkan/specs/latest/html/vkspec.html#fundamentals-validusage-pNext.

VK_KHR_get_physical_device_properties2 is an instance extension,
required for the previous one.  If the application hasn't enabled it,
do in its behalf.

This fixes `vulkan_driver` option in applications that ask for
Vulkan 1.0 (e.g. vkcube) but that the driver does support the extra
extensions.

Author: cmarcelo

src/vulkan.cpp

@@ -82,6 +82,7 @@ struct instance_data {
    enum EngineTypes engine;
    notify_thread notifier;
    int control_client;
+   bool has_props2;
 };
 
 /* Mapped from VkDevice */
@@ -1819,35 +1820,25 @@ static VkResult overlay_CreateDevice(
    chain_info->u.pLayerInfo = chain_info->u.pLayerInfo->pNext;
 
 
-   std::vector<const char*> enabled_extensions(pCreateInfo->ppEnabledExtensionNames,
-                                               pCreateInfo->ppEnabledExtensionNames +
-                                               pCreateInfo->enabledExtensionCount);
+   bool can_get_driver_info = false;
 
-   uint32_t extension_count;
-
-   instance_data->vtable.EnumerateDeviceExtensionProperties(physicalDevice, nullptr, &extension_count, nullptr);
-
-   std::vector<VkExtensionProperties> available_extensions(extension_count);
-   instance_data->vtable.EnumerateDeviceExtensionProperties(physicalDevice, nullptr, &extension_count, available_extensions.data());
+   // VK_KHR_driver_properties became core in 1.2
+   if (instance_data->api_version >= VK_API_VERSION_1_2) {
+      can_get_driver_info = true;
 
+   } else if (instance_data->has_props2) {
+      uint32_t device_extension_count;
+      instance_data->vtable.EnumerateDeviceExtensionProperties(physicalDevice, nullptr, &device_extension_count, nullptr);
 
-   bool can_get_driver_info = instance_data->api_version < VK_API_VERSION_1_1 ? false : true;
+      std::vector<VkExtensionProperties> device_extensions(device_extension_count);
+      instance_data->vtable.EnumerateDeviceExtensionProperties(physicalDevice, nullptr, &device_extension_count, device_extensions.data());
 
-   // VK_KHR_driver_properties became core in 1.2
-   if (instance_data->api_version < VK_API_VERSION_1_2 && can_get_driver_info) {
-      for (auto& extension : available_extensions) {
-         if (extension.extensionName == std::string(VK_KHR_DRIVER_PROPERTIES_EXTENSION_NAME)) {
-            for (auto& enabled : enabled_extensions) {
-               if (enabled == std::string(VK_KHR_DRIVER_PROPERTIES_EXTENSION_NAME))
-                  goto DONT;
-            }
-            enabled_extensions.push_back(VK_KHR_DRIVER_PROPERTIES_EXTENSION_NAME);
-            DONT:
-            goto FOUND;
+      for (const auto& ext : device_extensions) {
+         if (ext.extensionName == std::string(VK_KHR_DRIVER_PROPERTIES_EXTENSION_NAME)) {
+            can_get_driver_info = true;
+            break;
          }
       }
-      can_get_driver_info = false;
-      FOUND:;
    }
 
    VkResult result = fpCreateDevice(physicalDevice, pCreateInfo, pAllocator, pDevice);
@@ -1949,11 +1940,59 @@ static VkResult overlay_CreateInstance(
    // Advance the link info for the next element on the chain
    chain_info->u.pLayerInfo = chain_info->u.pLayerInfo->pNext;
 
+   const uint32_t api_version = pCreateInfo->pApplicationInfo ? pCreateInfo->pApplicationInfo->apiVersion : VK_API_VERSION_1_0;
+   bool has_props2 = false;
+
+   std::vector<const char *> modified_extensions(pCreateInfo->enabledExtensionCount);
+   VkInstanceCreateInfo modified_create_info = {};
+
+   if (api_version >= VK_API_VERSION_1_1) {
+      // Part of Vulkan core.
+      has_props2 = true;
+
+   } else {
+      bool present = false;
+      for (uint32_t i = 0; i < pCreateInfo->enabledExtensionCount; i++) {
+         const char *ext = pCreateInfo->ppEnabledExtensionNames[i];
+         modified_extensions[i] = ext;
+         if (strcmp(ext, VK_KHR_GET_PHYSICAL_DEVICE_PROPERTIES_2_EXTENSION_NAME) == 0)
+            present = true;
+      }
+
+      // Enable VK_KHR_get_physical_device_properties2 if the application hasn't yet and
+      // it is supported.
+      if (!present) {
+         PFN_vkEnumerateInstanceExtensionProperties fpEnumerateInstnaceExtensionProperties =
+            (PFN_vkEnumerateInstanceExtensionProperties)fpGetInstanceProcAddr(NULL, "vkEnumerateInstanceExtensionProperties");
+         uint32_t supported_extensions_count;
+         fpEnumerateInstnaceExtensionProperties(nullptr, &supported_extensions_count, nullptr);
+
+         std::vector<VkExtensionProperties> supported_extensions(supported_extensions_count);
+         fpEnumerateInstnaceExtensionProperties(nullptr, &supported_extensions_count, supported_extensions.data());
+
+         for (const auto& ext : supported_extensions) {
+            if (strcmp(ext.extensionName, VK_KHR_GET_PHYSICAL_DEVICE_PROPERTIES_2_EXTENSION_NAME) == 0) {
+               has_props2 = true;
+               break;
+            }
+         }
+
+         if (has_props2) {
+            modified_extensions.push_back(VK_KHR_GET_PHYSICAL_DEVICE_PROPERTIES_2_EXTENSION_NAME);
+            modified_create_info = *pCreateInfo;
+            modified_create_info.enabledExtensionCount = modified_extensions.size();
+            modified_create_info.ppEnabledExtensionNames = modified_extensions.data();
+            pCreateInfo = &modified_create_info;
+         }
+      }
+   }
 
    VkResult result = fpCreateInstance(pCreateInfo, pAllocator, pInstance);
    if (result != VK_SUCCESS) return result;
 
    struct instance_data *instance_data = new_instance_data(*pInstance);
+   instance_data->api_version = api_version;
+   instance_data->has_props2 = true;
    vk_load_instance_commands(instance_data->instance,
                              fpGetInstanceProcAddr,
                              &instance_data->vtable);
@@ -1982,8 +2021,6 @@ static VkResult overlay_CreateInstance(
       instance_data->engineVersion = engineVersion;
    }
 
-   instance_data->api_version = pCreateInfo->pApplicationInfo ? pCreateInfo->pApplicationInfo->apiVersion : VK_API_VERSION_1_0;
-
    return result;
 }