OpenGL: Text disappear once I draw vertices.

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Hiya!

Kinda new to OpenGL. But catching up quite fast atleast, with the help from various tutorials. Got this one problem i can't figure out though.

Got this CFont class which holds on to 256 ascii-characters once the font is built. Later on i can print text with:



CFont* m_font = new CFont();

m_font->print(position_x, position_y, "some text");


And it works. But whenever I draw some vertices on-screen, the text disappear. I've tried both glLoadIdentity() and glPushMatrix() before and glPopMatrix after drawing shapes, nothing helps.

The only other shape I've tested this with was my polygon-mousecursor. Once I draw the mousecursor, the text hide. I made a DisplayList of my mousecursor after a while, then the text got visible again.

Anyways... first here's where I build the font. Should be sufficient.


GLvoid CFont::build_font(void) {

Display *dpy; /* Our current X display */
XFontStruct *fontInfo; /* Our font info */

/* Storage for 256 characters */
m_base = glGenLists(256);

/* Get our current display long enough to get the fonts */
dpy = XOpenDisplay(NULL);

/* Get the font information */
fontInfo = XLoadQueryFont(dpy, "-adobe-helvetica-medium-r-normal--18-*-*-*-p-*-iso8859-1");

/* If the above font didn't exist try one that should */
if (!fontInfo) {
fontInfo = XLoadQueryFont(dpy, "fixed");
/* If that font doesn't exist, something is wrong */
if (fontInfo == NULL) {
fprintf(stderr, "no X font available?\n");
}
}

/* generate list */
glXUseXFont(fontInfo->fid, 32, 256, m_base);

/* Free some memory */
XFreeFont(dpy, fontInfo);

/* Close display */
XCloseDisplay(dpy);

return;
}

And here we print out text. Note that I got the glRasterPos2f(x, y); that positions the text, inside the print-function.


GLvoid CFont::print(GLint x, GLint y, const char *fmt, ...) {

glRasterPos2f(x, y); // set writing position

char text[256];
va_list ap;

/* If there's no text, do nothing */
if (fmt == NULL)
return;

/* Parses The String For Variables */
va_start(ap, fmt);
/* Converts Symbols To Actual Numbers */
vsprintf(text, fmt, ap);
va_end(ap);

/* Pushes the Display List Bits */
glPushAttrib(GL_LIST_BIT);

/* Sets base character to 32 */
glListBase(m_base-32);

/* Draws the text */
glCallLists(strlen(text), GL_UNSIGNED_BYTE, text);

/* Pops the Display List Bits */
glPopAttrib();

}

So if I do this, text disappear.



m_font->print(4, m_render->get_height()-4 , "Down left corner");

// glPushMatrix(); // <-- should I be here? See no difference.

glTranslatef(mouse_x, mouse_y, 0);

glBegin(GL_TRIANGLES);
glVertex3f(0, 0, 0);;
glVertex3f(35.f, 20.f, 0);
glVertex3f(20.f, 35.f, 0);
glEnd();

// glPopMatrix(); // if push


Anyone has an idea? Been stuck on this all day long now.
PS. Could add that the app. is 2D only. No depth/z.

Grateful for any hints on what could be wrong. ~ Rikard