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Fixed bug 4570 - Support Vulkan Portability rather than MoltenVK specifically

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Dzmitry Malyshau

Current code, search paths, and error messages are written to only consider MoltenVK on macOS as a Vulkan Portability implementation. It's not the only implementation available to the users. gfx-portability [1] has been shown to run a number of titles well, including Dota2, Dolphin Emulator, and vkQuake3, often out-performing MoltenVK in frame rate and stability (see Dolphin benchmark [2]).

There is no reason for SDL to be that specific, it's not using any MVK-specific functions other than the WSI initialization ("VK_MVK_macos_surface"). gfx-portability exposes this extension as well, and a more generic WSI extension is in process. It would be good if SDL was written in a more generic way that expect a Vulkan Portability library as opposed to MoltenVK specifically.

[1] https://github.com/gfx-rs/portability
[2] https://gfx-rs.github.io/2019/03/22/dolphin-macos-performance.html
This commit is contained in:
Sam Lantinga 2019-06-11 18:13:46 -07:00
parent 3e9bf28413
commit 69d27a69cd
4 changed files with 39 additions and 25 deletions
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6
include/SDL_vulkan.h
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@ -98,8 +98,8 @@ typedef VkSurfaceKHR SDL_vulkanSurface; /* for compatibility with Tizen */
* 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
* followed by \c libvulkan.dylib, in that order.
* On iOS SDL will attempt to load \c libvulkan.dylib only. Applications
* using a dynamic framework or .dylib must ensure it is included in its
* application bundle.
*
@ -153,7 +153,7 @@ extern DECLSPEC void SDLCALL SDL_Vulkan_UnloadLibrary(void);
* is smaller than the number of required extensions, \c SDL_FALSE will be
* returned instead of \c SDL_TRUE, to indicate that not all the required
* extensions were returned.
*
*
* \note If \c window is not NULL, it will be checked against its creation
* flags to ensure that the Vulkan flag is present. This parameter
* will be removed in a future major release.