Dear Mark,
Thank you for your replay,
I'm not understanding why that simple opengl program gives the message:
Xlib: extension "XFree86-DRI" missing on display ":0.0".
I belive that is the use of GLUT library, because I've already commented
the line Load "dri" from XF86Config and restarted X. When I run the
program, the message was the same.
Since I do not see any references to DRI on the program and according your
message DRI should not be necessary to run opengl programs, I belive that
the glut.h header should use some DRI resources, Am I correct?
I've got the program from: http:www.opengl.org and I'm attaching the
program in this message. This may help understanding the problem.
#include <GL/gl.h>
#include <GL/glut.h>
void display(void)
{
/* clear all pixels */
glClear (GL_COLOR_BUFFER_BIT);
/* draw white polygon (rectangle) with corners at
* (0.25, 0.25, 0.0) and (0.75, 0.75, 0.0)
*/
glColor3f (1.0, 1.0, 1.0);
glBegin(GL_POLYGON);
glVertex3f (0.25, 0.25, 0.0);
glVertex3f (0.75, 0.25, 0.0);
glVertex3f (0.75, 0.75, 0.0);
glVertex3f (0.25, 0.75, 0.0);
glEnd();
/* don't wait!
* start processing buffered OpenGL routines
*/
glFlush ();
}
void init (void)
{
/* select clearing (background) color */
glClearColor (0.0, 0.0, 0.0, 0.0);
/* initialize viewing values */
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);
}
/*
* Declare initial window size, position, and display mode
* (single buffer and RGBA). Open window with "hello"
* in its title bar. Call initialization routines.
* Register callback function to display graphics.
* Enter main loop and process events.
*/
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
glutInitWindowSize (250, 250);
glutInitWindowPosition (100, 100);
glutCreateWindow ("hello");
init ();
glutDisplayFunc(display);
glutMainLoop();
return 0; /* ISO C requires main to return int. */
}
On Tue, 23 Mar 2004, Mark Vojkovich wrote:
> On Tue, 23 Mar 2004, Paulo Belletato wrote:
>
> > Hi all,
> >
> > I'm trying to run some simple examples of opengl programs from a tutorial of
> > www.opengl.org in a Pentium III - 1GHz with a video card NVIDIA RIVA TNT2,
> > using XFree86 4.3.0 version 11, Revision 0, Release 6.6.
> > (Release Date: 27 February 2003)
> > My system is a FreeBSD 4.8-RELEASE #0: Thu Apr 3 10:53:38 GMT 2003
> >
> > I could compile a simple example, but when trying to run the ./a.out prog.
> > I received the message:
> >
> > GLUT: Fatal Error in a.out: OpenGL GLX extension not supported by display: :0.0
> >
> > I could eliminate that problem including the line Load "glx" in my XF86Config
> > file. I also added the Load "dri" in the same file. But now trying to run the
> > a.out program I get the message:
> >
> > Xlib: extension "XFree86-DRI" missing on display ":0.0".
>
> The DRI extension should not be required for OpenGL to work.
>
> >
> > I've found some related messages in this list that discussed this problem but
> > I didn't understand what should I do to solve it.
> >
> > I have no experience with graphics programming so I have some elementary doubts:
> >
> > 1. Are there any TUTORIAL to solve this problem?
> > 2. Should I download and install the NVIDIA driver from NVIDIA Corp.?
>
> If you want hardware accelerated OpenGL, then yes.
>
> > 3. Is this card compatible with 3D acceleration?
>
> The "nv" driver that comes with XFree86 does not support
> HW 3D acceleration, but it should still work unaccelerated
> with the OpenGL libraries and glx module that come with
> XFree86. NVIDIA's binary drivers will replace XFree86's
> GLX module and OpenGL libraries with ones that support HW
> OpenGL acceleration on NVIDIA hardware.
>
>
> > 4. Should the examples from www.opengl.org run in a non-accelerated card?
>
> They should run with even with the software OpenGL rendering
> used by the "nv" driver.
>
>
> Mark.
> _______________________________________________
> XFree86 mailing list
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>
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