GH-674 Check if Vulkan is supported before attempting to Initialize

drivers/vulkan/rendering_context_driver_vulkan.cpp

@@ -37,6 +37,7 @@
 #include "vk_enum_string_helper.h"
 
 #include "core/config/project_settings.h"
+#include "core/error/error_list.h"
 #include "core/version.h"
 
 #include "rendering_device_driver_vulkan.h"
@@ -914,15 +915,72 @@ Error RenderingContextDriverVulkan::_create_vulkan_instance(const VkInstanceCrea
 	return OK;
 }
 
-Error RenderingContextDriverVulkan::initialize() {
-	Error err;
+bool RenderingContextDriverVulkan::_vulkan_is_supported() {
+	if (VulkanHooks::get_singleton() != nullptr) {
+		VkPhysicalDevice hooked_device = VK_NULL_HANDLE;
+		return VulkanHooks::get_singleton()->get_physical_device(&hooked_device);
+	}
 
 #ifdef USE_VOLK
 	if (volkInitialize() != VK_SUCCESS) {
-		return FAILED;
+		return false;
+	}
+
+	if (!vkCreateInstance) {
+		return false;
+	}
+#endif
+
+	VkApplicationInfo app_info{};
+	app_info.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO;
+	app_info.apiVersion = VK_API_VERSION_1_0;
+
+	VkInstanceCreateInfo create_info{};
+	create_info.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;
+	create_info.pApplicationInfo = &app_info;
+
+#if defined(USE_VOLK) && (defined(MACOS_ENABLED) || defined(IOS_ENABLED))
+	const char *probe_extensions[] = { VK_KHR_PORTABILITY_ENUMERATION_EXTENSION_NAME };
+	create_info.enabledExtensionCount = 1;
+	create_info.ppEnabledExtensionNames = probe_extensions;
+	create_info.flags |= VK_INSTANCE_CREATE_ENUMERATE_PORTABILITY_BIT_KHR;
+#endif
+
+	VkInstance _instance;
+	if (vkCreateInstance(&create_info, nullptr, &_instance) != VK_SUCCESS) {
+		return false;
+	}
+
+#ifdef USE_VOLK
+	volkLoadInstance(_instance);
+#endif
+
+#ifdef USE_VOLK
+	if (!vkEnumeratePhysicalDevices) {
+		vkDestroyInstance(_instance, nullptr);
+		return false;
 	}
 #endif
 
+	uint32_t device_count = 0;
+	VkResult result = vkEnumeratePhysicalDevices(_instance, &device_count, nullptr);
+
+	vkDestroyInstance(_instance, nullptr);
+
+	if (result != VK_SUCCESS || device_count == 0) {
+		return false;
+	}
+
+	return true;
+}
+
+Error RenderingContextDriverVulkan::initialize() {
+	Error err;
+
+	if (!_vulkan_is_supported()) {
+		return ERR_UNAVAILABLE;
+	}
+
 	err = _initialize_vulkan_version();
 	ERR_FAIL_COND_V(err != OK, err);
 

drivers/vulkan/rendering_context_driver_vulkan.h

@@ -108,6 +108,7 @@ class RenderingContextDriverVulkan : public RenderingContextDriver {
 	VkDebugReportCallbackEXT debug_report = VK_NULL_HANDLE;
 	Functions functions;
 
+	bool _vulkan_is_supported();
 	Error _initialize_vulkan_version();
 	void _register_requested_instance_extension(const CharString &p_extension_name, bool p_required);
 	Error _initialize_instance_extensions();