Switching to Hydra (GL) viewport crashes Maya in refactoring_sandbox branch

[BigRoy]

Issue

I've just compiled maya-usd with refactoring_sandbox using the latest commit which instantly crashes Maya 2019.2 with a fatal error when switching the viewport to Hydra (GL). This even occurs in an empty new scene.

Maya Crash log:
MayaCrashLog191025.1356.log

I'm not sure where the issue was introduced but it could be with PR #59 which mentions changes to the viewport 2.0 but not explicitly to Hydra.

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About 15 days ago I was able to compile the latest of refactoring_sandbox branch at the time and load up the Hydra viewport just fine of which some notes were mentioned here #51

[BigRoy]

I also noticed this in the Output Window:

#############################################################################
#  VP2_RENDER_DELEGATE_PROXY is overridden to 'true'.  Default is 'false'.  #
#############################################################################
###############################################################################
Begin attempted read of a fragment graph XML file.
Attempting to read fragment XML code from: d:/dev/usd/maya-usd-build/install/RelWithDebInfo/plugin/pxr/maya/plugin/pxrUsdPreviewSurface/resources/usdPreviewSurface.xml
Resolved file path is: d:\dev\usd\maya-usd-build\install\RelWithDebInfo\plugin\pxr\maya\plugin\pxrUsdPreviewSurface\resources\usdPreviewSurface.xml
Attempting to read fragment XML code from a buffer of length 9192
Errors loading XML:
-------------------------------------------------------------------------------
OGS WARNING: The input parameter of a connection 'vectorInput' from fragment 'mayaShaderGeom_Float4GetX' was not found.
OGS WARNING: The input parameter of a connection 'vectorInput' from fragment 'mayaShaderGeom_Float4GetY' was not found.
OGS WARNING: The input parameter of a connection 'vectorInput' from fragment 'mayaShaderGeom_Float4GetZ' was not found.
OGS WARNING: The input parameter of a connection 'vectorInput' from fragment 'mayaShaderGeom_Float4GetW' was not found.
OGS WARNING: The output parameter of a connection 'floatOutput' from fragment 'mayaShaderGeom_Float4GetX' was not found.
OGS WARNING: The output parameter of a connection 'floatOutput' from fragment 'mayaShaderGeom_Float4GetY' was not found.
OGS WARNING: The output parameter of a connection 'floatOutput' from fragment 'mayaShaderGeom_Float4GetZ' was not found.
OGS WARNING: The output parameter of a connection 'floatOutput' from fragment 'mayaShaderGeom_Float4GetW' was not found.
-------------------------------------------------------------------------------
End attempted read of fragment XML.
###############################################################################
Stack trace:
  mtoh.mll!pxrInternal_v0_19__pxrReserved__::MtohRenderOverride::_SelectionChanged Line 694 
  mtoh.mll!pxrInternal_v0_19__pxrReserved__::MtohRenderOverride::_InitHydraResources Line 627 
  mtoh.mll!pxrInternal_v0_19__pxrReserved__::MtohRenderOverride::Render Line 462 
  mtoh.mll!pxrInternal_v0_19__pxrReserved__::HdMayaRender::execute Line 84 
  OpenMayaRender.dll!Autodesk::Maya::OpenMaya20190000::MHWRender::MRenderer::initialize
  OGSMayaBridge.dll!OGSMayaRenderer::performUserOperation
  OGSMayaBridge.dll!OGSMayaRenderer::performOverrideRenderGraph
  OGSMayaBridge.dll!OGSMayaBaseRenderer::performOverrideRender
  OGSMayaBridge.dll!OGSGeometryEvaluationOverride::~OGSGeometryEvaluationOverride
  OGSMayaBridge.dll!OGSGeometryEvaluationOverride::~OGSGeometryEvaluationOverride
  DataModel.dll!TidleRefreshCmd::refreshOGSRender
  DataModel.dll!TidleRefreshCmd::refresh
  DataModel.dll!TidleRefreshCmd::doIt
  ExtensionLayer.dll!TeventHandler::doIdles
  ExtensionLayer.dll!TidleLicenseAction::doIdleAction
  Qt5Core.dll!QObject::event
  Qt5Widgets.dll!QApplicationPrivate::notify_helper
  Qt5Widgets.dll!QApplication::notify
  ExtensionLayer.dll!TwindowManager::windowPreferencesAreEnabled
  Qt5Core.dll!QCoreApplication::notifyInternal2
  Qt5Core.dll!QEventDispatcherWin32::event
  Qt5Widgets.dll!QApplicationPrivate::notify_helper
  Qt5Widgets.dll!QApplication::notify
  ExtensionLayer.dll!TwindowManager::windowPreferencesAreEnabled
  Qt5Core.dll!QCoreApplication::notifyInternal2
  Qt5Core.dll!QCoreApplicationPrivate::sendPostedEvents
  qwindows.dll!qt_plugin_query_metadata
  Qt5Core.dll!QEventDispatcherWin32::processEvents
  USER32.dll!CallWindowProcW
  USER32.dll!DispatchMessageW
  Qt5Core.dll!QEventDispatcherWin32::processEvents
  qwindows.dll!qt_plugin_query_metadata
  Qt5Core.dll!QEventLoop::exec
  Qt5Core.dll!QCoreApplication::exec
  ExtensionLayer.dll!Tapplication::start
  maya.exe!<7FF6081C77A8>
  maya.exe!TiteratorWrapperFwd<TscenePartitions::ConstIteratorDescriptor,TiteratorWrapper<TscenePartitions::ConstIteratorDescriptor> >::operator++
  maya.exe!TiteratorWrapperFwd<TscenePartitions::ConstIteratorDescriptor,TiteratorWrapper<TscenePartitions::ConstIteratorDescriptor> >::operator++
  KERNEL32.DLL!BaseThreadInitThunk
  ntdll.dll!RtlUserThreadStart

And also:

Missing hdMaya.dll in lib\usd\hdMaya\resources

This last one does seem to hint to what is going on, because indeed hdMaya.dll is not there.

So it's not in: lib\usd\hdMaya\resources\hdMaya.dll
However it does actually exist in: lib\hdMaya.dll

[huidong-chen]

Thanks for reporting the issue. I am working now for a fix.

[BigRoy]

Fixed with #79

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Note that this warning still shows, but that is not a regression and thus was there before.

Coding Error: in _Load at line 248 of D:\dev\usd\USD\pxr\base\lib\plug\plugin.cpp -- Load of 'd:/dev/usd/maya-usd-build/install/RelWithDebInfo/lib/usd/hdMaya/resources/hdMaya.dll' for 'hdMaya' failed: The specified module could not be found.

[suekieza]

linking my issue here as well #98