My text doesn't display

I'm trying to display text on the screen, but my worst nightmare happens: the program compiles, no errors, but nothing happens when I run the program. All I get is a black screen.
I wrote the code so that I code write text onto the screen by simply doing

Code:

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glPrint("Hello World %2.2f", float_var);

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It's supposed to parse strings just like a real printf() would do.
This is the code I'm using:

Code:

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// this selects the current font to be used in drawing
void buildfont() {
        base = glGenLists(96);        // storage for 96 charecters
       
        aglUseFont(aglGetCurrentContext(),
                                kFontIDMonaco,                // Choose your font. These are listed in Fonts.h,
                                                                        // or use GetFNum() toolbox function.
                                bold,                                // Style, Also in Fonts.h
                                24,                                        // 12 point                       
                                32,                                        // start at 32 ...
                                96,                                        // go for 96 characters ...
                                base);
}

// supposed to look like an "official" opengl function :)
void glPrint(const char *fmt, ...) {

        char text[256];                                // holds the string
        va_list ap;                                        // pointer to list of arguments
       
        if (fmt == NULL)                        // make sure there is text here
                return;
               
        va_start(ap, fmt);                        // parses the string for variables
        vsprintf(text, fmt, ap);        // convert the symbols into actual numbers
        va_end(ap);                                        // results are stored in text
       
        glPushAttrib(GL_LIST_BIT);        // pushes the display list bits
        glListBase(base-32);                // sets the base charecter to 32
        glCallLists(strlen(text), GL_UNSIGNED_BYTE, text);        // draws the display list text
        glPopAttrib();                                // pops the display list bits back to the way it was before
}

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Does the problem lie within the Apple specific code, agl? Or am I doing something wrong with GLUT?

Are you calling glRasterPos2(i/f) before trying to print? If not try that.

yes.

ty something like:

Code:

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glPushMatrix();
                glTranslatef(0,0,-8);
                glColor3f(1.0f,0.0f,0.0f);
                glRasterPos2f(-9.95f,6.5f);
                glPrint("Hello World %2.2f", float_var);
glPopMatrix();

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Still doesn't work. It's got to be something with my text functions, because triangles and quads display fine.

I don't have time to sort through details, but here's my function for drawing the FPS to the screen.

Code:

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void drawFPS() {

  static char fpsBuf[100] = {0};

  glDisable(GL_TEXTURE_2D);
  glDisable(GL_FOG);
  //glShadeModel(GL_FLAT);

  glMatrixMode(GL_PROJECTION);
  glPushMatrix();
  glLoadIdentity();
  glOrtho(-0.5, 639.5, -0.5, 479.5, -1.0, 1.0);

  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();

  static int frames = 0;
  static int t0 = 0;
  frames++;
  GLint t = glutGet(GLUT_ELAPSED_TIME);
  if (t - t0 >= 2000) {
    GLfloat seconds = (t - t0) / 1000.0;
    GLfloat fps = frames / seconds;
    sprintf(fpsBuf, "FPS: %f", fps);
    t0 = t;
    frames = 0;
  }

  glColor3f(1.0f, 1.0f, 1.0f);
  printString(GLUT_BITMAP_HELVETICA_18, fpsBuf);

  glMatrixMode(GL_PROJECTION);
  glPopMatrix();
  glMatrixMode(GL_MODELVIEW);

  glShadeModel(GL_SMOOTH);
}

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Having slept on this, just a thought, did you try to disable/enable GL_TEXTURE_2D ?

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I don't have time to sort through details, but here's my function for drawing the FPS to the screen.

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But what does printString() do? (it's a user-supplied function, right?)

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Having slept on this, just a thought, did you try to disable/enable GL_TEXTURE_2D ?

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I hadn't enabled it. I tried enabling it. No change.

>But what does printString() do? (it's a user-supplied function, right?)
wups...

Code:

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void printString(void* font, const char* str, int x = 10, int y = 10) {

  glRasterPos2i(x, y);
  int len = strlen(str);
  for (int i = 0; i < len; i++) {
    glutBitmapCharacter(font, str[i]);
  }
}

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YES!! I finally got it to work! thankyou thankyou thankyou thankyou....

What finally got it working?

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Originally Posted by xds4lx

What finally got it working?

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my code ;)