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[Marco Trevisan (Treviño) <mail@xxxxxxxxx>]

** Changed in: nux (Ubuntu)
       Status: New => Fix Released

** Changed in: nux (Ubuntu)
   Importance: Undecided => High

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https://bugs.launchpad.net/bugs/1064918

Title:
  view canvas example crashes

Status in Nux:
  Fix Released
Status in Nux Playground:
  Fix Committed
Status in nux package in Ubuntu:
  Fix Released

Bug description:
  Nuxplayground view-canvas example crashes with the following error
  (Tested with lp:nux and lp:~unity-team/nux/nux.improve-redirect-
  rendering):

  (gdb) run
  Starting program: /home/eleni/staging/source/playgroundbranches/nuxplayground/src/view-canvas/view-canvas
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
  nux::logging::Writer::Writer()
  Nux: Gpu Vendor: NVIDIA Corporation
  Nux: Gpu Renderer: GeForce GT 520/PCIe/SSE2/3DNOW!
  Nux: Gpu OpenGL Version: 4.2.0 NVIDIA 304.43
  Nux: Gpu OpenGL Major Version: 4
  Nux: Gpu OpenGL Minor Version: 2
  Nux: The GraphicsEngine is using the GLSL shader code path.
  terminate called after throwing an instance of 'std::logic_error'
    what():  basic_string::_S_construct null not valid

  Program received signal SIGABRT, Aborted.
  0xb7fdd424 in __kernel_vsyscall ()
  (gdb)

  Catch throw:

  
  (gdb) catch throw
  Function "__cxa_throw" not defined.
  Catchpoint 1 (throw)
  (gdb) run
  Starting program: /home/eleni/staging/playgroundtobe/nuxplayground/src/view-canvas/view-canvas 
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/i386-linux-gnu/i686/cmov/libthread_db.so.1".
  nux::logging::Writer::Writer()
  Catchpoint 1 (exception thrown), 0xb7160f40 in __cxa_throw ()
     from /usr/lib/i386-linux-gnu/libstdc++.so.6

  (gdb) frame 1
  #1  0xb71bad54 in std::__throw_logic_error(char const*) ()
     from /usr/lib/i386-linux-gnu/libstdc++.so.6

  (gdb) frame 2
  #2  0xb71c85ca in char* std::string::_S_construct<char const*>(char const*, char const*, std::allocator<char> const&, std::forward_iterator_tag) ()
     from /usr/lib/i386-linux-gnu/libstdc++.so.6

  (gdb) frame 3
  #3  0xb71c8d16 in std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&) ()
     from /usr/lib/i386-linux-gnu/libstdc++.so.6

  (gdb) frame 4
  #4  0xb7906b17 in nux::IOpenGLShaderProgram::LoadVertexShader (this=0x82e8e00, 
      glslshader=0x8079654 ' ' <repeats 12 times>, "\n        uniform mat4 ViewProjectionMatrix;      \n        attribute vec4 AVertex;", ' ' <repeats 17 times>, "\n        attribute vec4 VertexColor;", ' ' <repeats 13 times>, "\n        void main()", ' ' <repeats 21 times>..., VtxShaderPreprocessorDefines=0x0)
      at ./IOpenGLGLSLShader.cpp:518
  518         std::string Defines(VtxShaderPreprocessorDefines);

  (gdb) frame 5
  #5  0xb78d89be in nux::GLSh_ColorPicker::GLSh_ColorPicker (this=0x82e8cf8, 
      color_channel=137268560) at ./GLSh_ColorPicker.cpp:303
  303           sprog->LoadVertexShader(VtxShader.GetTCharPtr(), NULL);

  (gdb) frame 6
  #6  0xb7a0e9e6 in nux::ColorEditor::ColorEditor (this=0x82a3f80, 
      __Nux_FileName__=0xb71f35bc "HX\005\bFη\034·p,\037·HX\005\bVη\034·Ό5\037·HX\005\bgη\034·Ό5\037·HX\005\b|η\034·Ό5\037·HX\005\b\215η\034·Ό5\037·HX\005\b\236η\034·p,\037·HX\005\b°η\034·ψ5\037·HX\005\bΐη\034·ψ5\037·HX\005\bΣη\034·ψ5\037·", __Nux_LineNumber__=-1222691396) at ./ColorEditor.cpp:329
  329         m_RedShader = new GLSh_ColorPicker(color::RED);

  (gdb) frame 7
  #7  0x0804e015 in UIInitialization (thread=0x8085af8, InitData=0x0)
      at view-canvas.cpp:129
  warning: Source file is more recent than executable.
  129       nux::ColorEditor* color_editor = new nux::ColorEditor(NUX_TRACKER_LOCATION);

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