mirror of
https://gitlab.kitware.com/vtk/vtk-m
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140 lines
4.5 KiB
C++
140 lines
4.5 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//
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// Copyright 2014 Sandia Corporation.
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// Copyright 2014 UT-Battelle, LLC.
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// Copyright 2014 Los Alamos National Security.
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//
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// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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// the U.S. Government retains certain rights in this software.
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//
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// Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
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// Laboratory (LANL), the U.S. Government retains certain rights in
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// this software.
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//============================================================================
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#ifndef vtk_m_interop_testing_TestingWindow_h
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#define vtk_m_interop_testing_TestingWindow_h
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#include <vtkm/internal/ExportMacros.h>
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#include <vtkm/interop/testing/WindowBase.h>
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#if defined(VTKM_GCC) && defined(VTKM_POSIX) && !defined(__APPLE__)
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//
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// 1. Some Linux distributions default linker implicitly enables the as-needed
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// linking flag. This means that your shared library or executable will only
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// link to libraries from which they use symbols. So if you explicitly link to
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// pthread but don't use any symbols you wont have a 'DT_NEEDED' entry for
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// pthread.
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//
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// 2. NVidia libGL (driver version 352 ) uses pthread but doesn't have
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// a DT_NEEDED entry for the library. When you run ldd or readelf on the library
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// you won't detect any reference to the pthread library. Aside this is odd
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// since the mesa version does explicitly link to pthread. But if you run the
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// following command:
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// "strings /usr/lib/nvidia-352/libGL.so.1 | grep pthread | less"
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// You will see the following:
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// { pthread_create
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// pthread_self
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// pthread_equal
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// pthread_key_crea
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// ...
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// libpthread.so.0
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// libpthread.so
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// pthread_create
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// }
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//
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// This is very strong evidence that this library is using pthread.
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//
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//
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// 3. So what does this all mean?
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//
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// It means that on system that use the linking flag 'as-needed', are using
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// the nvidia driver, and don't use pthread will generate binaries that crash
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// on launch. The only way to work around this issue is to do either:
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//
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//
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// A: Specify 'no-as-needed' to the linker potentially causing over-linking
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// and a slow down in link time.
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//
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// B: Use a method from pthread, making the linker realize that pthread is
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// needed. Note we have to actually call the method so that a linker with
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// optimizations enabled doesn't remove the function and pthread requirement.
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//
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//
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// So that is the explanation on why we have the following function which is
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// used once, doesn't look to be useful and seems very crazy.
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#include <pthread.h>
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#include <iostream>
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#define VTKM_NVIDIA_PTHREAD_WORKAROUND 1
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static int vtkm_force_linking_to_pthread_to_fix_nvidia_libgl_bug()
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{ return static_cast<int>(pthread_self()); }
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#endif
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namespace vtkm{
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namespace interop{
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namespace testing{
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/// \brief Basic Render Window that only makes sure opengl has a valid context
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///
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/// Bare-bones class that fulfullis the requirements of WindowBase but
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/// has no ability to interact with opengl other than to close down the window
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///
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///
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class TestingWindow : public vtkm::interop::testing::WindowBase<TestingWindow>
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{
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public:
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VTKM_CONT_EXPORT TestingWindow(){};
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//called after opengl is inited
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VTKM_CONT_EXPORT void PostInit()
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{}
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VTKM_CONT_EXPORT void Display()
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{}
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VTKM_CONT_EXPORT void Idle()
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{}
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VTKM_CONT_EXPORT void ChangeSize(int vtkmNotUsed(w), int vtkmNotUsed(h) )
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{}
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VTKM_CONT_EXPORT void Key(unsigned char key,
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int vtkmNotUsed(x), int vtkmNotUsed(y) )
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{
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if(key == 27) //escape pressed
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{
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#if defined(VTKM_NVIDIA_PTHREAD_WORKAROUND)
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std::cout << ::vtkm_force_linking_to_pthread_to_fix_nvidia_libgl_bug();
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#endif
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exit(0);
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}
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}
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VTKM_CONT_EXPORT void SpecialKey(int vtkmNotUsed(key),
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int vtkmNotUsed(x), int vtkmNotUsed(y) )
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{}
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VTKM_CONT_EXPORT void Mouse(int vtkmNotUsed(button), int vtkmNotUsed(state),
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int vtkmNotUsed(x), int vtkmNotUsed(y) )
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{}
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VTKM_CONT_EXPORT void MouseMove(int vtkmNotUsed(x), int vtkmNotUsed(y) )
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{}
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VTKM_CONT_EXPORT void PassiveMouseMove(int vtkmNotUsed(x), int vtkmNotUsed(y) )
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{}
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};
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}
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}
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}
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#endif //vtk_m_interop_testing_TestingWindow_h
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