> Does anyone out there use xforms for the interface, while
> using opengl/mesa for display/rendering? ...
Yes. Works fine for me. I use the GL Canvas and a somewhat modified
version of the gl.c file supplied with the XForms distribution. I
have especially modified the glx_init routine to use a the default
Colormap whenever possible and to choose the Visual in a somewhat
different manner.
I enclose my version of the routine here:
/*
* Default GL canvas configuration. The user can modify this default
* using fl_set_glcanvas_defaults(const int *config) or
* fl_set_glcanvas_attributes(FL_OBJECT *, const int *config)
*
*/
static int glconfig[MAXATTRIB] =
{
GLX_RGBA, GLX_DEPTH_SIZE, 1,
GLX_RED_SIZE, 8, GLX_GREEN_SIZE, 8, GLX_BLUE_SIZE, 8,
GLX_DOUBLEBUFFER,
None
};
static int lists[][MAXATTRIB] = { /* Try these if we lose */
{
GLX_RGBA,
GLX_RED_SIZE, 8, GLX_GREEN_SIZE, 8, GLX_BLUE_SIZE, 8,
GLX_DOUBLEBUFFER,
None
},
{
GLX_RGBA,
GLX_RED_SIZE, 8, GLX_GREEN_SIZE, 8, GLX_BLUE_SIZE, 8,
None
},
{
GLX_RGBA,
GLX_DOUBLEBUFFER,
None
},
{
GLX_RGBA,
None
},
};
#define N(x) ( sizeof( x ) / sizeof( x[0] ) )
[...]
/* Initialize the OpenGL stuff before window creation */
static int
glx_init(FL_OBJECT * ob)
{
XVisualInfo *vi;
GLXContext context;
int screen_number;
Visual *default_visual;
int list;
/* query for openGL capabilities */
if (!glXQueryExtension(fl_display, 0, 0))
abend( "GLCanvas: OpenGL not supported" );
if ( !( vi = glXChooseVisual(fl_display,
fl_screen, GLPROP(ob)->glconfig) ) )
for ( list = 0; list < N( lists ); list++ )
if ( vi = glXChooseVisual(fl_display,
fl_screen, lists[list] ) ) {
memcpy( GLPROP(ob)->glconfig,
lists[list],
MAXATTRIB * sizeof( int ) );
break;
}
if ( !vi )
abend( "GLCanvas: Can't get a visual for love nor money!" );
/* change canvas defaults */
fl_set_canvas_visual(ob, vi->visual);
fl_set_canvas_depth(ob, vi->depth);
screen_number = DefaultScreen( fl_get_display() );
default_visual = DefaultVisual( fl_get_display(), screen_number );
if ( default_visual->class != vi->visual->class )
fl_set_canvas_colormap(ob, fl_create_colormap(vi, 1));
else
fl_set_canvas_colormap( ob,
DefaultColormap( fl_get_display(),
screen_number ) );
context = glXCreateContext(fl_display, vi, None, GLPROP(ob)->direct);
if (!context)
abend( "Can't create GLX context!" );
/* under some conditions, the parent of the gl canvas might go away,
leaving the old context and vi hanging. */
glx_cleanup(ob);
GLPROP(ob)->context = context;
GLPROP(ob)->xvinfo = vi;
return 0;
}
You may want to set different perferences for suboptimal Visual
fallback.
You'll have to change a few things to integrate this into your
application, especially references to my private abend() routine
(guess which large mainframe vendor's systems I spent several years
programming :-) ). abend() simply prints a message and terminates the
program.
spl
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