diff --git a/Modules/DiffusionImaging/DiffusionCore/CMakeLists.txt b/Modules/DiffusionImaging/DiffusionCore/CMakeLists.txt
index 53c8d0b53e..b0ee596bbe 100644
--- a/Modules/DiffusionImaging/DiffusionCore/CMakeLists.txt
+++ b/Modules/DiffusionImaging/DiffusionCore/CMakeLists.txt
@@ -1,20 +1,19 @@
 # With apple gcc 4.2.1 the following waring leads to an build error if boost is enabled
 if(APPLE)
   mitkFunctionCheckCAndCXXCompilerFlags("-Wno-error=empty-body" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
 endif()
 
 MITK_CREATE_MODULE(
   SUBPROJECTS MITK-DTI
   INCLUDE_DIRS Algorithms Algorithms/Reconstruction Algorithms/Registration Algorithms/Reconstruction/MultishellProcessing DicomImport IODataStructures/DiffusionWeightedImages IODataStructures/QBallImages IODataStructures/TensorImages IODataStructures Rendering ${CMAKE_CURRENT_BINARY_DIR}
   DEPENDS MitkMapperExt MitkPlanarFigure MitkImageExtraction MitkSceneSerializationBase MitkDICOMReader
   PACKAGE_DEPENDS VTK|vtkFiltersProgrammable ITK|ITKDistanceMap+ITKRegistrationCommon+ITKLabelVoting+ITKVTK Boost
                   ITK|ITKMetricsv4+ITKRegistrationMethodsv4
   WARNINGS_AS_ERRORS
 )
 
 if(MSVC)
-    list(APPEND module_compile_flags /wd4005)
-    set_target_properties(${MODULE_TARGET} PROPERTIES COMPILE_FLAGS "${module_compile_flags}")
-  endif()
+  mitkFunctionCheckCAndCXXCompilerFlags("/wd4005" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
+endif()
 
 add_subdirectory(Testing)
diff --git a/Modules/GPGPU/mitkGPGPU.cpp b/Modules/GPGPU/mitkGPGPU.cpp
index 56de055027..abb8c2320c 100644
--- a/Modules/GPGPU/mitkGPGPU.cpp
+++ b/Modules/GPGPU/mitkGPGPU.cpp
@@ -1,627 +1,627 @@
 /*===================================================================
 
 The Medical Imaging Interaction Toolkit (MITK)
 
 Copyright (c) German Cancer Research Center,
 Division of Medical and Biological Informatics.
 All rights reserved.
 
 This software is distributed WITHOUT ANY WARRANTY; without
 even the implied warranty of MERCHANTABILITY or FITNESS FOR
 A PARTICULAR PURPOSE.
 
 See LICENSE.txt or http://www.mitk.org for details.
 
 ===================================================================*/
 
 #include <QApplication>
 #include <QWidget>
 #include "mitkGPGPU.h"
 
 #include <iostream>
 
 #define GPGPU_INFO MITK_INFO("mitk.gpgpu")
 #define GPGPU_ERROR MITK_ERROR("mitk.gpgpu")
 #define GPGPU_CHECKGLERR MITK_ERROR(glGetError()!=GL_NO_ERROR)("mitk.gpgpu") << "GL ERROR @ "
 
 
 #define OPERATING_TEXTURE GL_TEXTURE15
 
 static GLint convertTextureFormatToInternalFormatGL(mitk::GPGPU::TextureFormat format)
 {
   switch(format)
   {
     case mitk::GPGPU::FLOAT32_LUMINANCE:       return GL_LUMINANCE_FLOAT32_ATI;
     case mitk::GPGPU::FLOAT32_LUMINANCE_ALPHA: return GL_LUMINANCE_ALPHA_FLOAT32_ATI;
     case mitk::GPGPU::FLOAT32_RGBA:            return GL_RGBA32F_ARB;
     case mitk::GPGPU::UINT8_RGBA:              return GL_RGBA8;
   }
   return 0;
 }
 
 static GLint convertTextureFormatToFormatGL(mitk::GPGPU::TextureFormat format)
 {
   switch(format)
   {
     case mitk::GPGPU::FLOAT32_LUMINANCE:       return GL_LUMINANCE;
     case mitk::GPGPU::FLOAT32_LUMINANCE_ALPHA: return GL_LUMINANCE_ALPHA;
     case mitk::GPGPU::FLOAT32_RGBA:            return GL_RGBA;
     case mitk::GPGPU::UINT8_RGBA:              return GL_RGBA;
   }
   return 0;
 }
 
 static GLint convertTextureFormatToTypeGL(mitk::GPGPU::TextureFormat format)
 {
   switch(format)
   {
     case mitk::GPGPU::FLOAT32_LUMINANCE:       return GL_FLOAT;
     case mitk::GPGPU::FLOAT32_LUMINANCE_ALPHA: return GL_FLOAT;
     case mitk::GPGPU::FLOAT32_RGBA:            return GL_FLOAT;
     case mitk::GPGPU::UINT8_RGBA:              return GL_UNSIGNED_BYTE;
   }
   return 0;
 }
 
 
 int mitk::GPGPU::Texture::GetWidth(){return myWidth;}
 int mitk::GPGPU::Texture::GetHeigth(){return myHeight;}
 int mitk::GPGPU::Texture::GetDepth(){return myDepth;}
 
 
 mitk::GPGPU::Texture::Texture(mitk::GPGPU::TextureFormat format,int width,int height,int depth)
 {
   if(depth==0)
     glTarget=GL_TEXTURE_2D;
   else
     glTarget=GL_TEXTURE_3D;
 
   myFormat=format;
   myWidth=width;
   myHeight=height;
   myDepth=depth;
 
   GLuint handle;
 
   glGenTextures(1,&handle);
   glTextureHandle = handle;
   glActiveTexture(OPERATING_TEXTURE);
   glBindTexture(glTarget,glTextureHandle);
 
   GPGPU_CHECKGLERR << "allocating texture handle";
 
   if(glTarget==GL_TEXTURE_2D)
   {
     glTexImage2D(GL_TEXTURE_2D,0,convertTextureFormatToInternalFormatGL(myFormat),width,height,0,GL_RGBA,GL_UNSIGNED_BYTE,0);
 //    glGenerateMipmap(GL_TEXTURE_2D);
 
   glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_R,GL_CLAMP_TO_EDGE);
   glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_CLAMP_TO_EDGE);
 
   glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
   glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
 
 
   }
   else
   {
     glTexImage3D(GL_TEXTURE_3D,0,convertTextureFormatToInternalFormatGL(myFormat),width,height,depth,0,GL_RGBA,GL_UNSIGNED_BYTE,0);
 //  glGenerateMipmap(GL_TEXTURE_3D);
 
   glTexParameteri(GL_TEXTURE_3D,GL_TEXTURE_WRAP_R,GL_CLAMP_TO_EDGE);
   glTexParameteri(GL_TEXTURE_3D,GL_TEXTURE_WRAP_S,GL_CLAMP_TO_EDGE);
   glTexParameteri(GL_TEXTURE_3D,GL_TEXTURE_WRAP_T,GL_CLAMP_TO_EDGE);
 
   glTexParameteri(GL_TEXTURE_3D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
   glTexParameteri(GL_TEXTURE_3D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
 
   }
 
   GPGPU_CHECKGLERR << "declaring texture format&dimensions";
 
   glGenFramebuffers(1,&handle);
   glFBOHandle = handle;
 
   GPGPU_CHECKGLERR << "allocating framebuffer object";
 }
 
 mitk::GPGPU::Texture::~Texture()
 {
   GLuint handle;
 
   handle=glFBOHandle;
   glDeleteFramebuffers(1,&handle);
   GPGPU_CHECKGLERR << "deleting framebufferobject";
 
   handle=glTextureHandle;
   glDeleteTextures(1,&handle);
   GPGPU_CHECKGLERR << "deleting texture handle";
 }
 
 void mitk::GPGPU::Texture::ActivateAsSource(int unit)
 {
   glActiveTexture(GL_TEXTURE0 + unit);
   glBindTexture(glTarget,glTextureHandle);
 
   GPGPU_CHECKGLERR << "binding texture to unit";
 }
 
 void mitk::GPGPU::Texture::ActivateAsDestination()
 {
 
   static GLenum buffers[5][4] =
   {
     { GL_NONE, GL_NONE, GL_NONE, GL_NONE },
     { GL_COLOR_ATTACHMENT0, GL_NONE, GL_NONE, GL_NONE },
     { GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1, GL_NONE, GL_NONE },
     { GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1, GL_COLOR_ATTACHMENT2, GL_NONE },
     { GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1, GL_COLOR_ATTACHMENT2, GL_COLOR_ATTACHMENT3 },
   };
 
 
   glBindFramebuffer( GL_FRAMEBUFFER, glFBOHandle );
   glDrawBuffers(4, buffers[1]);
   glFramebufferTexture2D( GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, glTarget,glTextureHandle,0);
 
   GPGPU_CHECKGLERR << "associating texture to framebufferobject";
 
   int error = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
   switch(error)
   {
      case GL_FRAMEBUFFER_COMPLETE_EXT:
       break;
     case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT_EXT:
        GPGPU_ERROR << "Incomplete attachment\n";break;
     case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT:
       GPGPU_ERROR << "Missing attachment\n";break;
     case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT:
       GPGPU_ERROR << "Incomplete dimensions\n";break;
     case GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT:
       GPGPU_ERROR << "Incomplete formats\n";break;
     case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT:
       GPGPU_ERROR << "Incomplete draw buffer\n";break;
     case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT:
       GPGPU_ERROR << "Incomplete read buffer\n";break;
     case GL_FRAMEBUFFER_UNSUPPORTED_EXT:
       GPGPU_ERROR << "Framebufferobjects unsupported\n";break;
     default:
       GPGPU_ERROR << "unknown framebuffer status\n";break;
   }
 
   glViewport(0,0,myWidth,myHeight);
 
   GPGPU_CHECKGLERR << "setting viewport";
 }
 
 void mitk::GPGPU::Texture::Upload(TextureFormat inputformat,const void *src)
 {
   glActiveTexture(OPERATING_TEXTURE);
   glBindTexture(glTarget,glTextureHandle);
 
   if(glTarget==GL_TEXTURE_2D)
   {
     glTexSubImage2D(GL_TEXTURE_2D,0,0,0,myWidth,myHeight,convertTextureFormatToFormatGL(inputformat),convertTextureFormatToTypeGL(inputformat),src);
   }
   else
   {
     glTexSubImage3D(GL_TEXTURE_3D,0,0,0,0,myWidth,myHeight,myDepth,convertTextureFormatToFormatGL(inputformat),convertTextureFormatToTypeGL(inputformat),src);
 
   }
 
   GPGPU_CHECKGLERR << "texture upload to gpu";
 
 }
 
 void mitk::GPGPU::Texture::Download(TextureFormat inputformat,void *dst)
 {
   glActiveTexture(OPERATING_TEXTURE);
   glBindTexture(glTarget,glTextureHandle);
 
   if(glTarget==GL_TEXTURE_2D)
   {
     glGetTexImage( GL_TEXTURE_2D,0,convertTextureFormatToFormatGL(inputformat),convertTextureFormatToTypeGL(inputformat),dst);
     GPGPU_CHECKGLERR << "texture download to cpu";
   }
   else
   {
   }
 }
 
 static char stubVertexShader[] =
   "void main() { gl_Position = vec4( 2*gl_Vertex.xy-1,0,1 ); }\n";
 
 
 mitk::GPGPU::Shader::Shader(char *source)
 {
   //std::cout << "compiling shader:\n" << source << std::endl;
 
   glHandleVertex = glCreateShader(GL_VERTEX_SHADER);
   glHandleFragment = glCreateShader(GL_FRAGMENT_SHADER);
   glHandleProgram = glCreateProgram();
 
   GLchar *src[2];
 
   src[0] = stubVertexShader;
   src[1] = 0;
 
   glShaderSource(glHandleVertex,1,(const GLchar **)src,0);
 
   src[0] = source;
   src[1] = 0;
 
   glShaderSource(glHandleFragment,1,(const GLchar **)src,0);
 
   bool failed=false;
 
   GLint _sv,_sf,_sl;
 
   glCompileShader( glHandleVertex );
   GPGPU_CHECKGLERR << "compiling vertex shader";
   glGetShaderiv( glHandleVertex, GL_COMPILE_STATUS, &_sv);
   if( !_sv)
   {
     GPGPU_ERROR << "vertex shader compilation failed\n";
     failed=true;
   }
 
   glCompileShader( glHandleFragment );
   GPGPU_CHECKGLERR << "compiling fragment shader";
   glGetShaderiv( glHandleFragment, GL_COMPILE_STATUS, &_sf);
   if( !_sf)
   {
     GPGPU_ERROR << "fragment shader compilation failed\n";
     failed=true;
   }
 
   glAttachShader( glHandleProgram,glHandleVertex );
   glAttachShader( glHandleProgram,glHandleFragment );
   glLinkProgram( glHandleProgram );
   GPGPU_CHECKGLERR << "linking shader program";
   glGetProgramiv( glHandleProgram, GL_LINK_STATUS, &_sl);
   if( !_sl)
   {
     GPGPU_ERROR << "shader linkage failed\n";
     failed=true;
   }
 
   if(failed)
   {
      int infologLength = 0;
      int charsWritten  = 0;
      char *infoLog;
 
      glGetProgramiv(glHandleProgram, GL_INFO_LOG_LENGTH,&infologLength);
 
      if (infologLength > 0)
      {
         infoLog = (char *)malloc(infologLength);
         glGetProgramInfoLog(glHandleProgram, infologLength, &charsWritten, infoLog);
         GPGPU_ERROR << "SHADER CREATION FAILED INFOLOG:\n" << infoLog;
         free(infoLog);
      }
   }
 
 }
 
 mitk::GPGPU::Shader::~Shader()
 {
   glDeleteProgram( glHandleProgram);
   glDeleteShader( glHandleVertex );
   glDeleteShader( glHandleFragment );
 }
 
 void mitk::GPGPU::Shader::Activate()
 {
   glUseProgram( glHandleProgram );
   GPGPU_CHECKGLERR << "activating shader";
 }
 
 int mitk::GPGPU::Shader::GetUniformLocation(char *name)
 {
   return glGetUniformLocation(glHandleProgram,name);
 }
 
 
 void mitk::GPGPU::Shader::SetUniform(char *name,int i0)
 {
   glUniform1i( GetUniformLocation(name) , i0);
 
   GPGPU_CHECKGLERR << "setting uniform";
 }
 
 void mitk::GPGPU::Shader::SetUniform(char *name,int i0,int i1)
 {
   GLint i[2];
   i[0]=i0;
   i[1]=i1;
   glUniform2iv(  GetUniformLocation(name) , 1 , i );
   GPGPU_CHECKGLERR << "setting uniform";
 }
 
 void mitk::GPGPU::Shader::SetUniform(char *name,int i0,int i1,int i2)
 {
   GLint i[3];
   i[0]=i0;
   i[1]=i1;
   i[2]=i2;
   glUniform3iv(  GetUniformLocation(name) , 1 , i );
   GPGPU_CHECKGLERR << "setting uniform";
 }
 
 void mitk::GPGPU::Shader::SetUniform(char *name,int i0,int i1,int i2,int i3)
 {
   GLint i[4];
   i[0]=i0;
   i[1]=i1;
   i[2]=i2;
   i[3]=i3;
   glUniform4iv(  GetUniformLocation(name) , 1 , i );
   GPGPU_CHECKGLERR << "setting uniform";
 }
 
 void mitk::GPGPU::Shader::SetUniform(char *name,float i0)
 {
   GLint location = GetUniformLocation(name);
   glUniform1f(location,i0);
   GPGPU_CHECKGLERR << "setting uniform";
 }
 
 void mitk::GPGPU::Shader::SetUniform(char *name,float i0,float i1)
 {
   GLfloat i[2];
   i[0]=i0;
   i[1]=i1;
   glUniform2fv(GetUniformLocation(name),1,i);
   GPGPU_CHECKGLERR << "setting uniform";
 }
 
 void mitk::GPGPU::Shader::SetUniform(char *name,float i0,float i1,float i2)
 {
   GLfloat i[3];
   i[0]=i0;
   i[1]=i1;
   i[2]=i2;
   glUniform3fv(GetUniformLocation(name),1,i);
   GPGPU_CHECKGLERR << "setting uniform";
 }
 
 void mitk::GPGPU::Shader::SetUniform(char *name,float i0,float i1,float i2,float i3)
 {
   GLfloat i[4];
   i[0]=i0;
   i[1]=i1;
   i[2]=i2;
   i[3]=i3;
   glUniform4fv(GetUniformLocation(name),1,i);
   GPGPU_CHECKGLERR << "setting uniform";
 }
 
 #ifdef _WIN32
 LRESULT CALLBACK MainWndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
 {
   switch(msg)
   {
     case WM_CLOSE:
       DestroyWindow(hwnd);
       break;
     case WM_DESTROY:
       PostQuitMessage(0);
       break;
     default:
       return DefWindowProc(hwnd, msg, wParam, lParam);
   }
   return 0;
 }
 #endif
 
 mitk::GPGPU::GPGPU()
 {
 
 #ifdef _WIN32
                /*
   WNDCLASSEX wcx;
 
   // Fill in the window class structure with parameters
   // that describe the main window.
 
   wcx.cbSize = sizeof(wcx);          // size of structure
   wcx.style = CS_HREDRAW |
     CS_VREDRAW;                    // redraw if size changes
   wcx.lpfnWndProc = MainWndProc;     // points to window procedure
   wcx.cbClsExtra = 0;                // no extra class memory
   wcx.cbWndExtra = 0;                // no extra window memory
   wcx.hInstance = GetModuleHandle(NULL);         // handle to inst ance
   wcx.hIcon = LoadIcon(NULL,
     IDI_APPLICATION);              // predefined app. icon
   wcx.hCursor = LoadCursor(NULL,
     IDC_ARROW);                    // predefined arrow
   wcx.hbrBackground = NULL;                  // white background brush
   wcx.lpszMenuName = (LPCSTR) "MainMenu";    // name of menu resource
   wcx.lpszClassName = (LPCSTR) "MainWClass";  // name of window class
   wcx.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
 
   // Register the window class.
 
   if(!RegisterClassEx(&wcx))
     std::cout << "failed registering window class\n";
 
   HWND desktopWindow=CreateWindowEx(
     WS_EX_CLIENTEDGE,
     (LPCSTR)"MainWClass",
     (LPCSTR)"Anatomy of a Window",
     WS_OVERLAPPEDWINDOW,
     CW_USEDEFAULT, CW_USEDEFAULT, 240, 120,
     NULL,
     NULL,
     GetModuleHandle(NULL),
     NULL);
   windowHandle = desktopWindow;
   ShowWindow(desktopWindow, SW_RESTORE);
 
   if(desktopWindow==0)
     std::cout << "failed creating window\n";
                  */
 
-  HWND desktopWindow=QApplication::topLevelWidgets().at(0)->winId();
+  HWND desktopWindow= (HWND)QApplication::topLevelWidgets().at(0)->winId();
 
   windowsContext = GetDC(desktopWindow);
 
   if(windowsContext==0)
     std::cout << "failed getting window device context\n";
 
   static PIXELFORMATDESCRIPTOR pfd =// pfd Tells Windows How We Want Things To Be
   {
     sizeof(PIXELFORMATDESCRIPTOR),  // Size Of This Pixel Format Descriptor
     1,                              // Version Number
     PFD_DRAW_TO_WINDOW |            // Format Must Support Window
     PFD_SUPPORT_OPENGL |            // Format Must Support OpenGL
     PFD_DOUBLEBUFFER |
     PFD_SWAP_EXCHANGE ,              // Must Support Double Buffering
     PFD_TYPE_RGBA,                  // Request An RGBA Format
     24,                              // Select Our Color Depth
     0, 0, 0, 0, 0, 0,                // Color Bits Ignored  if(openGLContext==0)
     0,                              // No Alpha Buffer
     0,                              // Shift Bit Ignored
     0,                              // No Accumulation Buffer
     0, 0, 0, 0,                      // Accumulation Bits Ignored
     0,                              // 16Bit Z-Buffer (Depth Buffer)
     0,                              // No Stencil Buffer
     0,                              // No Auxiliary Buffer
     PFD_MAIN_PLANE,                  // Main Drawing Layer
     0,                              // Reserved
     0, 0, 0                          // Layer Masks Ignored
   };
 
 
   // Sonstiges einstellen
   int iFormat = ChoosePixelFormat(windowsContext,&pfd);
   SetPixelFormat(windowsContext,iFormat,&pfd);
 
 
   openGLContext = wglCreateContext(windowsContext);
 
   int errw=GetLastError();
 
   if(openGLContext==0)
     std::cout << "failed creating openGL context "<<errw<<"\n";
 
 #else
 
   X_display = XOpenDisplay(NULL);
 
   GPGPU_ERROR( !X_display ) << "cant open X display";
 
   GLX_drawable = QApplication::topLevelWidgets().at(0)->winId();
 
   GPGPU_ERROR( !GLX_drawable ) << "cant get toplevel widget from QT";
 
   static int visAttributes[] = {
     GLX_RGBA,
     GLX_RED_SIZE, 1,
     GLX_GREEN_SIZE, 1,
     GLX_BLUE_SIZE, 1,
     GLX_DOUBLEBUFFER,
     None
   };
 
   XVisualInfo *visinfo = glXChooseVisual(X_display, 0, visAttributes);
 
   GPGPU_ERROR(!visinfo) << "Unable to choose specified visual!";
 
   openGLContext = glXCreateContext(X_display, visinfo, 0, true);
 
   if(visinfo)
      XFree(visinfo);
 
   GPGPU_ERROR(!openGLContext) << "cant create GLX context";
 
 #endif
 
   Activate();
 
   GPGPU_INFO << "initializing glew";
 
   int err=glewInit();
 
   GPGPU_CHECKGLERR << "initializing glew";
   GPGPU_ERROR(GLEW_OK != err) << "glewInit() fails with " << err << " as text: " << glewGetErrorString(err);
 
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
   glOrtho(0,1,0,1,-1,1);
   glMatrixMode(GL_MODELVIEW);
   glLoadIdentity();
 
   GPGPU_CHECKGLERR << "intializing projection&modelview matrix";
 
   glDisable(GL_CULL_FACE);
   glShadeModel(GL_SMOOTH);              // Enable Smooth Shading
   glClearColor(0.0f, 0.0f, 0.0f, 0.0f);        // Black Background
   glClearDepth(1.0f);                  // Depth Buffer Setup
   glDisable(GL_DEPTH_TEST);              // Enables Depth Testing
   glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);  // Really Nice Perspective Calculations
   glHint(GL_TEXTURE_COMPRESSION_HINT, GL_NICEST);
   glDepthMask(false);
 
   GPGPU_CHECKGLERR << "setting up openGL context";
 }
 
 mitk::GPGPU::~GPGPU()
 {
 #ifdef _WIN32
 
   wglDeleteContext( openGLContext );
 
 #else
 
   if(openGLContext)
     glXDestroyContext(X_display,openGLContext);
 
   if(X_display)
     XCloseDisplay(X_display);
 
 #endif
 
 }
 
 void mitk::GPGPU::Activate()
 {
 
 #ifdef _WIN32
    wglMakeCurrent(windowsContext,openGLContext);
 #else
    glXMakeCurrent(X_display, GLX_drawable, openGLContext);
 #endif
 
    GPGPU_CHECKGLERR << "activating openGL context";
 }
 
 void mitk::GPGPU::Deactivate()
 {
 }
 
 void mitk::GPGPU::Run()
 {
   glBegin( GL_TRIANGLE_STRIP );
   glVertex2f( 0,0 );
   glVertex2f( 0,1 );
   glVertex2f( 1,0 );
   glVertex2f( 1,1 );
   glEnd();
 
   GPGPU_CHECKGLERR << "running a shader";
 }
 
 void mitk::GPGPU::Run(float start,float end)
 {
   glBegin( GL_TRIANGLE_STRIP );
   glVertex2f( 0,start );
   glVertex2f( 0,end );
   glVertex2f( 1,start );
   glVertex2f( 1,end );
   glEnd();
 
   GPGPU_CHECKGLERR << "running a shader";
 }