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QML 示例下的Vulkan最多运行几秒钟，然后崩溃并出现以下错误：

libc++abi.dylib: terminating with uncaught exception of type std::__1::system_error: mutex lock failed: Invalid argument

虽然动画在操作过程中看起来正确，但 QML 标签显示不正确：

伏尔甘松鼠

我正在使用 MoltenVK 1.1.130 (LunarG Vulkan SDK) 和 Qt 5.14.0 运行 macOS Catalina。我也尝试过 MoltenVK 1.2.131，结果相同。使用启用的 MoltenVK 时，每帧MVK_LOG_LEVEL_INFO打印两次以下消息：

[mvk-info] vkCreateMacOSSurfaceMVK(): You are not calling this function from the main thread. NSView should only be accessed from the main thread. When using this function outside the main thread, consider passing the CAMetalLayer itself in VkMacOSSurfaceCreateInfoMVK::pView, instead of the NSView.

问题

有谁知道这可能是什么原因？这是一个错误吗？有人成功运行这个例子吗？

尽管 Qt 的 Vulkan 集成已损坏，但 MVK 错误消息看起来像是：不仅每帧vkCreateMacOSSurfaceMVK调用两次，而且似乎从渲染线程（不是 GUI 线程/主线程）调用。

细节

为了将 Qt 与 Vulkan 一起使用，您必须从源代码编译 Qt 并提供 Vulkan 头文件。我用来编译 Qt 的配置调用是：

../qt5/configure -developer-build -skip qtquick3d -skip qtwebengine -opensource -nomake examples -nomake tests -confirm-license -vulkan -I $VULKAN_SDK/../MoltenVK/include -L $VULKAN_SDK/lib

我的环境变量是根据 LunarG 文档设置的：

export VULKAN_SDK="$HOME/SDK/vulkansdk-macos-1.1.130.0/macOS"
export PATH="$VULKAN_SDK/bin:$PATH"
export DYLD_LIBRARY_PATH="$VULKAN_SDK/lib:$DYLD_LIBRARY_PATH"
export VK_ICD_FILENAMES="$VULKAN_SDK/etc/vulkan/icd.d/MoltenVK_icd.json"
export VK_LAYER_PATH="$VULKAN_SDK/etc/vulkan/explicit_layer.d"
export VK_INSTANCE_LAYERS="VK_LAYER_KHRONOS_validation"

export QT_VULKAN_LIB="$VULKAN_SDK/lib/libMoltenVK.dylib"

（Qt 需要QT_VULKAN_LIB库dlopen。）

lldb 回溯：

[mvk-info] vkCreateMacOSSurfaceMVK(): You are not calling this function from the main thread. NSView should only be accessed from the main thread. When using this function outside the main thread, consider passing the CAMetalLayer itself in VkMacOSSurfaceCreateInfoMVK::pView, instead of the NSView.
[mvk-info] vkCreateMacOSSurfaceMVK(): You are not calling this function from the main thread. NSView should only be accessed from the main thread. When using this function outside the main thread, consider passing the CAMetalLayer itself in VkMacOSSurfaceCreateInfoMVK::pView, instead of the NSView.
libc++abi.dylib: terminating with uncaught exception of type std::__1::system_error: mutex lock failed: Invalid argument
Process 83453 stopped
* thread #10, name = 'QSGRenderThread', stop reason = signal SIGABRT
    frame #0: 0x00007fff648c57fa libsystem_kernel.dylib`__pthread_kill + 10
libsystem_kernel.dylib`__pthread_kill:
->  0x7fff648c57fa <+10>: jae    0x7fff648c5804            ; <+20>
    0x7fff648c57fc <+12>: movq   %rax, %rdi
    0x7fff648c57ff <+15>: jmp    0x7fff648bfa89            ; cerror_nocancel
    0x7fff648c5804 <+20>: retq   
Target 0: (main) stopped.
(lldb) frame info
frame #0: 0x00007fff648c57fa libsystem_kernel.dylib`__pthread_kill + 10
(lldb) frame variable
(lldb) bt
* thread #10, name = 'QSGRenderThread', stop reason = signal SIGABRT
  * frame #0: 0x00007fff648c57fa libsystem_kernel.dylib`__pthread_kill + 10
    frame #1: 0x00007fff64982bc1 libsystem_pthread.dylib`pthread_kill + 432
    frame #2: 0x00007fff6484ca1c libsystem_c.dylib`abort + 120
    frame #3: 0x00007fff618e6be8 libc++abi.dylib`abort_message + 231
    frame #4: 0x00007fff618e6d84 libc++abi.dylib`demangling_terminate_handler() + 238
    frame #5: 0x00007fff63412792 libobjc.A.dylib`_objc_terminate() + 104
    frame #6: 0x00007fff618f3dc7 libc++abi.dylib`std::__terminate(void (*)()) + 8
    frame #7: 0x00007fff618f3d79 libc++abi.dylib`std::terminate() + 41
    frame #8: 0x0000000103942439 libQt5Core_debug.5.dylib`qTerminate() at qglobal.cpp:3333:5
    frame #9: 0x000000010341f5f8 libQt5Core_debug.5.dylib`QThreadPrivate::start(arg=0x000000011721cfb0) at qthread_unix.cpp:354:9
    frame #10: 0x00007fff64982e65 libsystem_pthread.dylib`_pthread_start + 148
    frame #11: 0x00007fff6497e83b libsystem_pthread.dylib`thread_start + 15
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1 回答 1

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我已经报告了这个问题：QTBUG-82600

该修复程序已合并到 Qt 5.15.0 beta2 中。尽管不再发生崩溃，但文本仍然被破坏。对此的修复被推迟到 Qt6：QTBUG-83072

于 2020-03-04T15:16:17.140 回答