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Support official Vulkan SDK for macOS.

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This tries to load vulkan.framework or libvulkan.1.dylib before MoltenVK.framework
or libMoltenVK.dylib. In the previous version, layers would not work for applications
run-time loading the default library.
This commit is contained in:
Mark Callow
2018-02-25 23:02:09 -08:00
parent f9f45d0bf5
commit be6ca785e3
2 changed files with 59 additions and 24 deletions
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39
include/SDL_vulkan.h
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@@ -69,30 +69,43 @@ typedef VkSurfaceKHR SDL_vulkanSurface; /* for compatibility with Tizen */
* \brief Dynamically load a Vulkan loader library.
*
* \param [in] path The platform dependent Vulkan loader library name, or
* \c NULL to open the default Vulkan loader library.
* \c NULL.
*
* \return \c 0 on success, or \c -1 if the library couldn't be loaded.
*
* This should be done after initializing the video driver, but before
* If \a path is NULL SDL will use the value of the environment variable
* \c SDL_VULKAN_LIBRARY, if set, otherwise it loads the default Vulkan
* loader library.
*
* This should be called after initializing the video driver, but before
* creating any Vulkan windows. If no Vulkan loader library is loaded, the
* default library will be loaded upon creation of the first Vulkan window.
*
* \note If you specify a non-NULL \a path, you should retrieve all of the
* Vulkan functions used in your program from the dynamic library using
* \note It is fairly common for Vulkan applications to link with \a libvulkan
* instead of explicitly loading it at run time. This will work with
* SDL provided the application links to a dynamic library and both it
* and SDL use the same search path.
*
* \note If you specify a non-NULL \c path, an application should retrieve all
* of the Vulkan functions it uses from the dynamic library using
* \c SDL_Vulkan_GetVkGetInstanceProcAddr() unless you can guarantee
* \a path points to the same vulkan loader library that you linked to.
* \c path points to the same vulkan loader library the application
* linked to.
*
* \note On Apple devices, if \a path is NULL, SDL will attempt to find
* the vkGetInstanceProcAddr address within all the mach-o images of
* the current process. This is because the currently (v0.17.0)
* recommended MoltenVK (Vulkan on Metal) usage is as a static library.
* If it is not found then SDL will attempt to load \c libMoltenVK.dylib.
* Applications using the dylib alternative therefore do not need to do
* anything special when calling SDL.
* the current process. This is because it is fairly common for Vulkan
* applications to link with libvulkan (and historically MoltenVK was
* provided as a static library). If it is not found then, on macOS, SDL
* will attempt to load \c vulkan.framework/vulkan, \c libvulkan.1.dylib,
* \c MoltenVK.framework/MoltenVK and \c libMoltenVK.dylib in that order.
* On iOS SDL will attempt to load \c libMoltenVK.dylib. Applications
* using a dynamic framework or .dylib must ensure it is included in its
* application bundle.
*
* \note On non-Apple devices, SDL requires you to either not link to the
* Vulkan loader or link to a dynamic library version. This limitation
* may be removed in a future version of SDL.
* \note On non-Apple devices, application linking with a static libvulkan is
* not supported. Either do not link to the Vulkan loader or link to a
* dynamic library version.
*
* \note This function will fail if there are no working Vulkan drivers
* installed.