Hi all,
I am trying so use GLEW with in an fltk window...
it works fine under windows, but underlinux, I don't know for which reason, it
just doesn't work...
does anyone have any experience of FLTK+GLEW ?
should I use GLEW_MX preprocessor command to tell glew that I may have
different opengl context?
here is the code I've placed just after the
void draw(){
if ( !valid() ) {
valid(1);
Fl::gl_visual(FL_RGB|FL_DOUBLE|FL_DEPTH);
GLenum err = glewInit();
if (GLEW_OK != err){
fprintf(stderr, "Problem with GLEW
Initialisation:\n");
fprintf(stderr, "Error: %s\n",
glewGetErrorString(err));
}
if(GL_ARB_vertex_buffer_object){
fprintf(stdout,"VBO SUPPORTED\n");
}
if (glewGetExtension("glGenBuffersARB")!=GL_TRUE){
std::cout<<"GetExtension:glGenBuffersARB failed\n";
}
#ifdef linux
if(!glGenBuffersARB ){glGenBuffersARB =
(PFNGLGENBUFFERSARBPROC )glXGetProcAddress((const
GLubyte*)"glGenBuffersARB"); std::cout<<"glew failed\n";}
if(!glBindBufferARB ){glBindBufferARB =
(PFNGLBINDBUFFERARBPROC )glXGetProcAddress((const
GLubyte*)"glBindBufferARB"); std::cout<<"glew failed\n";}
if(!glBufferDataARB ){glBufferDataARB =
(PFNGLBUFFERDATAARBPROC )glXGetProcAddress((const GLubyte*)"glBufferDataARB
"); std::cout<<"glew failed\n";}
if(!glDeleteBuffersARB){glDeleteBuffersARB =
(PFNGLDELETEBUFFERSARBPROC)glXGetProcAddress((const
GLubyte*)"glDeleteBuffersARB"); std::cout<<"glew failed\n";}
#endif
if(!glGenBuffersARB )std::cout << "glGenBuffersARB
is not well loaded\n";
if(!glBindBufferARB )std::cout << "glBindBufferARB
is not well loaded\n";
if(!glBufferDataARB )std::cout << "glBufferDataARB
is not well loaded\n";
if(!glDeleteBuffersARB)std::cout << "glDeleteBuffersARB
is not well loaded\n";
...
}
as you can see from this code, I've made many tests,the printout of these is:
VBO SUPPORTED
GetExtension:glGenBuffersARB failed
glew failed
glew failed
glew failed
glew failed
which seems to indicate that when I use the simple glXGetProcAddress, I am able
to get the pointer of the function...
but not when using glew's API
any idea?
thanks a lot for help,
Loic
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