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+# Vulkan guide {#vulkan_guide}
+
+[TOC]
+
+This guide is intended to fill the gaps between the official [Vulkan
+resources](https://www.khronos.org/vulkan/) and the rest of the GLFW
+documentation and is not a replacement for either.  It assumes some familiarity
+with Vulkan concepts like loaders, devices, queues and surfaces and leaves it to
+the Vulkan documentation to explain the details of Vulkan functions.
+
+To develop for Vulkan you should download the [LunarG Vulkan
+SDK](https://vulkan.lunarg.com/) for your platform.  Apart from headers and link
+libraries, they also provide the validation layers necessary for development.
+
+The [Vulkan Tutorial](https://vulkan-tutorial.com/) has more information on how
+to use GLFW and Vulkan.  The [Khronos Vulkan
+Samples](https://github.com/KhronosGroup/Vulkan-Samples) also use GLFW, although
+with a small framework in between.
+
+For details on a specific Vulkan support function, see the @ref vulkan.  There
+are also guides for the other areas of the GLFW API.
+
+ - @ref intro_guide
+ - @ref window_guide
+ - @ref context_guide
+ - @ref monitor_guide
+ - @ref input_guide
+
+
+## Finding the Vulkan loader {#vulkan_loader}
+
+GLFW itself does not ever need to be linked against the Vulkan loader.
+
+By default, GLFW will load the Vulkan loader dynamically at runtime via its standard name:
+`vulkan-1.dll` on Windows, `libvulkan.so.1` on Linux and other Unix-like systems and
+`libvulkan.1.dylib` on macOS.
+
+@macos GLFW will also look up and search the `Frameworks` subdirectory of your
+application bundle.
+
+If your code is using a Vulkan loader with a different name or in a non-standard location
+you will need to direct GLFW to it.  Pass your version of `vkGetInstanceProcAddr` to @ref
+glfwInitVulkanLoader before initializing GLFW and it will use that function for all Vulkan
+entry point retrieval.  This prevents GLFW from dynamically loading the Vulkan loader.
+
+```c
+glfwInitVulkanLoader(vkGetInstanceProcAddr);
+```
+
+@macos To make your application be redistributable you will need to set up the application
+bundle according to the LunarG SDK documentation.  This is explained in more detail in the
+[SDK documentation for macOS](https://vulkan.lunarg.com/doc/sdk/latest/mac/getting_started.html).
+
+
+## Including the Vulkan header file {#vulkan_include}
+
+To have GLFW include the Vulkan header, define @ref GLFW_INCLUDE_VULKAN before including
+the GLFW header.
+
+```c
+#define GLFW_INCLUDE_VULKAN
+#include <GLFW/glfw3.h>
+```
+
+If you instead want to include the Vulkan header from a custom location or use
+your own custom Vulkan header then do this before the GLFW header.
+
+```c
+#include <path/to/vulkan.h>
+#include <GLFW/glfw3.h>
+```
+
+Unless a Vulkan header is included, either by the GLFW header or above it, the following
+GLFW functions will not be declared, as depend on Vulkan types.
+
+ - @ref glfwInitVulkanLoader
+ - @ref glfwGetInstanceProcAddress
+ - @ref glfwGetPhysicalDevicePresentationSupport
+ - @ref glfwCreateWindowSurface
+
+The `VK_USE_PLATFORM_*_KHR` macros do not need to be defined for the Vulkan part
+of GLFW to work.  Define them only if you are using these extensions directly.
+
+
+## Querying for Vulkan support {#vulkan_support}
+
+If you are linking directly against the Vulkan loader then you can skip this
+section.  The canonical desktop loader library exports all Vulkan core and
+Khronos extension functions, allowing them to be called directly.
+
+If you are loading the Vulkan loader dynamically instead of linking directly
+against it, you can check for the availability of a loader and ICD with @ref
+glfwVulkanSupported.
+
+```c
+if (glfwVulkanSupported())
+{
+    // Vulkan is available, at least for compute
+}
+```
+
+This function returns `GLFW_TRUE` if the Vulkan loader and any minimally
+functional ICD was found.
+
+If one or both were not found, calling any other Vulkan related GLFW function
+will generate a @ref GLFW_API_UNAVAILABLE error.
+
+
+### Querying Vulkan function pointers {#vulkan_proc}
+
+To load any Vulkan core or extension function from the found loader, call @ref
+glfwGetInstanceProcAddress.  To load functions needed for instance creation,
+pass `NULL` as the instance.
+
+```c
+PFN_vkCreateInstance pfnCreateInstance = (PFN_vkCreateInstance)
+    glfwGetInstanceProcAddress(NULL, "vkCreateInstance");
+```
+
+Once you have created an instance, you can load from it all other Vulkan core
+functions and functions from any instance extensions you enabled.
+
+```c
+PFN_vkCreateDevice pfnCreateDevice = (PFN_vkCreateDevice)
+    glfwGetInstanceProcAddress(instance, "vkCreateDevice");
+```
+
+This function in turn calls `vkGetInstanceProcAddr`.  If that fails, the
+function falls back to a platform-specific query of the Vulkan loader (i.e.
+`dlsym` or `GetProcAddress`).  If that also fails, the function returns `NULL`.
+For more information about `vkGetInstanceProcAddr`, see the Vulkan
+documentation.
+
+Vulkan also provides `vkGetDeviceProcAddr` for loading device-specific versions
+of Vulkan function.  This function can be retrieved from an instance with @ref
+glfwGetInstanceProcAddress.
+
+```c
+PFN_vkGetDeviceProcAddr pfnGetDeviceProcAddr = (PFN_vkGetDeviceProcAddr)
+    glfwGetInstanceProcAddress(instance, "vkGetDeviceProcAddr");
+```
+
+Device-specific functions may execute a little faster, due to not having to
+dispatch internally based on the device passed to them.  For more information
+about `vkGetDeviceProcAddr`, see the Vulkan documentation.
+
+
+## Querying required Vulkan extensions {#vulkan_ext}
+
+To do anything useful with Vulkan you need to create an instance.  If you want
+to use Vulkan to render to a window, you must enable the instance extensions
+GLFW requires to create Vulkan surfaces.
+
+To query the instance extensions required, call @ref
+glfwGetRequiredInstanceExtensions.
+
+```c
+uint32_t count;
+const char** extensions = glfwGetRequiredInstanceExtensions(&count);
+```
+
+These extensions must all be enabled when creating instances that are going to
+be passed to @ref glfwGetPhysicalDevicePresentationSupport and @ref
+glfwCreateWindowSurface.  The set of extensions will vary depending on platform
+and may also vary depending on graphics drivers and other factors.
+
+If it fails it will return `NULL` and GLFW will not be able to create Vulkan
+window surfaces.  You can still use Vulkan for off-screen rendering and compute
+work.
+
+If successful the returned array will always include `VK_KHR_surface`, so if
+you don't require any additional extensions you can pass this list directly to
+the `VkInstanceCreateInfo` struct.
+
+```c
+VkInstanceCreateInfo ici;
+
+memset(&ici, 0, sizeof(ici));
+ici.enabledExtensionCount = count;
+ici.ppEnabledExtensionNames = extensions;
+...
+```
+
+Additional extensions may be required by future versions of GLFW.  You should
+check whether any extensions you wish to enable are already in the returned
+array, as it is an error to specify an extension more than once in the
+`VkInstanceCreateInfo` struct.
+
+@macos MoltenVK is (as of July 2022) not yet a fully conformant implementation
+of Vulkan.  As of Vulkan SDK 1.3.216.0, this means you must also enable the
+`VK_KHR_portability_enumeration` instance extension and set the
+`VK_INSTANCE_CREATE_ENUMERATE_PORTABILITY_BIT_KHR` bit in the instance creation
+info flags for MoltenVK to show up in the list of physical devices.  For more
+information, see the Vulkan and MoltenVK documentation.
+
+
+## Querying for Vulkan presentation support {#vulkan_present}
+
+Not every queue family of every Vulkan device can present images to surfaces.
+To check whether a specific queue family of a physical device supports image
+presentation without first having to create a window and surface, call @ref
+glfwGetPhysicalDevicePresentationSupport.
+
+```c
+if (glfwGetPhysicalDevicePresentationSupport(instance, physical_device, queue_family_index))
+{
+    // Queue family supports image presentation
+}
+```
+
+The `VK_KHR_surface` extension additionally provides the
+`vkGetPhysicalDeviceSurfaceSupportKHR` function, which performs the same test on
+an existing Vulkan surface.
+
+
+## Creating the window {#vulkan_window}
+
+Unless you will be using OpenGL or OpenGL ES with the same window as Vulkan,
+there is no need to create a context.  You can disable context creation with the
+[GLFW_CLIENT_API](@ref GLFW_CLIENT_API_hint) hint.
+
+```c
+glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
+GLFWwindow* window = glfwCreateWindow(640, 480, "Window Title", NULL, NULL);
+```
+
+See @ref context_less for more information.
+
+
+## Creating a Vulkan window surface {#vulkan_surface}
+
+You can create a Vulkan surface (as defined by the `VK_KHR_surface` extension)
+for a GLFW window with @ref glfwCreateWindowSurface.
+
+```c
+VkSurfaceKHR surface;
+VkResult err = glfwCreateWindowSurface(instance, window, NULL, &surface);
+if (err)
+{
+    // Window surface creation failed
+}
+```
+
+If an OpenGL or OpenGL ES context was created on the window, the context has
+ownership of the presentation on the window and a Vulkan surface cannot be
+created.
+
+It is your responsibility to destroy the surface.  GLFW does not destroy it for
+you.  Call `vkDestroySurfaceKHR` function from the same extension to destroy it.
+