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macOS/MoltenVK issue on SDL 2.0.12 #1028

Closed
aclysma opened this issue Sep 16, 2020 · 2 comments · Fixed by #1030
Closed

macOS/MoltenVK issue on SDL 2.0.12 #1028

aclysma opened this issue Sep 16, 2020 · 2 comments · Fixed by #1030

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@aclysma
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aclysma commented Sep 16, 2020

My application runs with sdl2-sys 0.34.2 but not 0.34.3, when using bundled/static-link. The error message:

thread 'main' panicked at 'Failed to create window: SdlError("Vulkan support is either not configured in SDL or not available in current SDL video driver (cocoa) or platform")', engine/src/init.rs:51:18

It may be related to this:
KhronosGroup/MoltenVK#846

It sounds like VK_MVK_macos_surface was replaced with VK_EXT_metal_surface. I'll investigate this more later, but wanted to mention it.
@aclysma
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aclysma commented Sep 17, 2020

I was able to build SDL2 manually and static link it. It was not an easy process so a few things I had to do in build.rs for rust-sdl2:

  • Add the Metal framework: println!("cargo:rustc-link-lib=framework=Metal");
  • I did not have SDL2main and didn't figure out how to generate it so I REMOVED println!("cargo:rustc-link-lib=static=SDL2main");
  • Add clang_rt.osx
    • LIB: println!("cargo:rustc-link-lib=clang_rt.osx");
    • Search path: println!("cargo:rustc-link-search={}", "/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/11.0.3/lib/darwin"); to solve this error:
error: linking with `cc` failed: exit code: 1
...
  = note: Undefined symbols for architecture x86_64:
            "___isPlatformVersionAtLeast", referenced from:
                _METAL_CreateRenderer in libsdl2_sys-4e45691694f9156d.rlib(SDL_render_metal.o)
          ld: symbol(s) not found for architecture x86_64
          clang: error: linker command failed with exit code 1 (use -v to see invocation)

After static linking, my vulkan app works fine. I only reproduce the above behavior if I manually set SDL_VIDEO_VULKAN to 0. I think the next step is figuring out why bundled 2.0.12 SDL2 is producing different results than static linking my own SDL2 I built manually.

@aclysma
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aclysma commented Sep 18, 2020 •
edited
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The issue is that the HAVE_FRAMEWORK_METAL check is failing

Performing C SOURCE FILE Test HAVE_FRAMEWORK_METAL failed with the following output:
Change Dir: /Users/pmd/dev/rust/sdl2-test/target/debug/build/sdl2-sys-c89bed5a4182e1ce/out/build/CMakeFiles/CMakeTmp

Run Build Command(s):/usr/bin/make cmTC_5ace8/fast && /Applications/Xcode.app/Contents/Developer/usr/bin/make -f CMakeFiles/cmTC_5ace8.dir/build.make CMakeFiles/cmTC_5ace8.dir/build
Building C object CMakeFiles/cmTC_5ace8.dir/src.c.o
/usr/bin/cc   -ffunction-sections -fdata-sections -fPIC -m64 -arch x86_64 -idirafter /Users/pmd/dev/rust/sdl2-test/target/debug/build/sdl2-sys-c89bed5a4182e1ce/out/SDL2-2.0.12/src/video/khronos -DHAVE_FRAMEWORK_METAL  -x objective-c -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk   -o CMakeFiles/cmTC_5ace8.dir/src.c.o   -c /Users/pmd/dev/rust/sdl2-test/target/debug/build/sdl2-sys-c89bed5a4182e1ce/out/build/CMakeFiles/CMakeTmp/src.c
Linking C executable cmTC_5ace8
/usr/local/Cellar/cmake/3.16.4/bin/cmake -E cmake_link_script CMakeFiles/cmTC_5ace8.dir/link.txt --verbose=1
/usr/bin/cc  -ffunction-sections -fdata-sections -fPIC -m64 -arch x86_64 -idirafter /Users/pmd/dev/rust/sdl2-test/target/debug/build/sdl2-sys-c89bed5a4182e1ce/out/SDL2-2.0.12/src/video/khronos -DHAVE_FRAMEWORK_METAL  -x objective-c -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk -Wl,-search_paths_first -Wl,-headerpad_max_install_names   CMakeFiles/cmTC_5ace8.dir/src.c.o  -o cmTC_5ace8 
CMakeFiles/cmTC_5ace8.dir/src.c.o:1:1: error: source file is not valid UTF-8
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CMakeFiles/cmTC_5ace8.dir/src.c.o:1:2: error: source file is not valid UTF-8
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CMakeFiles/cmTC_5ace8.dir/src.c.o:1:3: error: source file is not valid UTF-8
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CMakeFiles/cmTC_5ace8.dir/src.c.o:1:4: error: source file is not valid UTF-8
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            ^

Looks like this was reported here:
https://discourse.libsdl.org/t/macos-build-issues-not-detecting-metal/27557

This error can be found in the CMakeError.log in the target directory and does not occur with sdl2-sys 0.34.2 which is based on SDL 2.0.10. I can reproduce this when manually building SDL2 from source when using cmake.

@aclysma aclysma mentioned this issue Sep 18, 2020
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Add SDL2 patch to fix metal detection for macOS/iOS aclysma/rust-sdl2
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@aclysma