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PrecisionAlex's avatar
PrecisionAlex
Honored Guest
6 years ago

GetPixels crashes on oculus quest only. How can I safely read the framebuffer on Oculus quest?

Hi I've been working on some functionality that requires capturing the screen to an RGB array for later processing/streaming. I've been using a pretty well documented met...
Rendering
PrecisionAlex's avatar
PrecisionAlex
Honored Guest
6 years ago
Hi, an update.

I was able to re-recreate this crash by simply issuing the "shot" console command.  The command goes through essentially the same process as I do and crashes at the same place.

Here is a callstack :

FVulkanDynamicRHI::RHIReadSurfaceData(FRHITexture*, FIntRect, TArray<FColor, TSizedDefaultAllocator<32> >&, FReadSurfaceDataFlags) VulkanRenderTarget.cpp:796
FRHICommandListImmediate::ReadSurfaceData(FRHITexture*, FIntRect, TArray<FColor, TSizedDefaultAllocator<32> >&, FReadSurfaceDataFlags) RHICommandList.h:4360
FRenderTarget::ReadPixels(TArray<FColor, TSizedDefaultAllocator<32> >&, FReadSurfaceDataFlags, FIntRect)::$_24::operator()(FRHICommandListImmediate&) const UnrealClient.cpp:76
TEnqueueUniqueRenderCommandType<FRenderTarget::ReadPixels(TArray<FColor, TSizedDefaultAllocator<32> >&, FReadSurfaceDataFlags, FIntRect)::ReadSurfaceCommandName, FRenderTarget::ReadPixels(TArray<FColor, TSizedDefaultAllocator<32> >&, FReadSurfaceDataFlags, FIntRect)::$_24>::DoTask(ENamedThreads::Type, TRefCountPtr<FGraphEvent> const&) RenderingThread.h:198
TGraphTask<TEnqueueUniqueRenderCommandType<FRenderTarget::ReadPixels(TArray<FColor, TSizedDefaultAllocator<32> >&, FReadSurfaceDataFlags, FIntRect)::ReadSurfaceCommandName, FRenderTarget::ReadPixels(TArray<FColor, TSizedDefaultAllocator<32> >&, FReadSurfaceDataFlags, FIntRect)::$_24> >::ExecuteTask(TArray<FBaseGraphTask*, TSizedDefaultAllocator<32> >&, ENamedThreads::Type) TaskGraphInterfaces.h:847
FBaseGraphTask::Execute(TArray<FBaseGraphTask*, TSizedDefaultAllocator<32> >&, ENamedThreads::Type) TaskGraphInterfaces.h:514
FNamedTaskThread::ProcessTasksNamedThread(int, bool) TaskGraph.cpp:686
FNamedTaskThread::ProcessTasksUntilQuit(int) TaskGraph.cpp:582
RenderingThreadMain(FEvent*) RenderingThread.cpp:339
FRenderingThread::Run() RenderingThread.cpp:488
FRunnableThreadPThread::Run() PThreadRunnableThread.cpp:25
FRunnableThreadPThread::_ThreadProc(void*) PThreadRunnableThread.h:177
__pthread_start(void*) 0x0000007f8dc79458
__start_thread 0x0000007f8dc21208