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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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2
include/SDL_config_macosx.h
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@ -218,7 +218,7 @@
#endif
/* Enable Vulkan support */
/* Metal/MoltenVK/Vulkan only supported on 64-bit architectures with 10.11+ */
/* Metal/Vulkan Portability only supported on 64-bit architectures with 10.11+ */
#if TARGET_CPU_X86_64 && (MAC_OS_X_VERSION_MAX_ALLOWED >= 101100)
#define SDL_VIDEO_VULKAN 1
#else