[Mesa3d-users] GLX questions

[Carlos P. <jos...@is...>]

Hi,

I apologize, these are essentialy GLX and X questions, not Mesa, I just 
don't know where else to ask this... I am trying to use only <GL/glx.h> 
to write a GTK/OpenGL app. It is working fine, though I still have some 
few questions, mainly regarding memory leaks:


1) The sintax for this list of attributes is correct? Shall I improve it 
somehow? it works for me...

int attributes[] = { GLX_RGBA, GLX_RED_SIZE, 1, GLX_GREEN_SIZE, 1,
GLX_BLUE_SIZE, 1, GLX_DOUBLEBUFFER, True, GLX_DEPTH_SIZE, 12, None };
XVisualInfo *visual_info;
visual_info = glXChooseVisual (display, screen, attributes);

2) free visual_info immediately after creating the context, when it is 
no longer needed? it works for me...

XVisualInfo *visual_info;
visual_info = glXChooseVisual (display, screen, attributes);
...
context = glXCreateContext (display, visual_info, NULL, TRUE);
XFree (visual_info); <<<<<<<<<<

3) free context and colormap when the GL window is removed? it works for 
me...

colormap = XCreateColormap (display, root, visual_info->visual, AllocNone);
context = glXCreateContext (display, visual_info, NULL, TRUE);
...
glXDestroyContext (display, context); <<<<<<<<
XFreeColormap (display, colormap); <<<<<<<<<<


3) Shall I free visual_info->visual in the end, when closing the app? I 
am not sure... I suppose the answer is no?

XVisualInfo *visual_info;

Thank you very much for your help... (I posted two fully working 
examples, one using GLX, the other GTKGLExt, at: 
http://www.gamgi.org/gtk_opengl.tar.gz).


Carlos