View Full Version : Display List Error

lost hope
01-18-2002, 06:43 AM
Hey -

I seem to be getting an error when I try to create an instance of my font class as a global variable.

For example, when I call the line:
lh_text text_ArialNarrow("Arial Narrow",hDC);
to generate an instance of my bitmap font class, the value returned by glGenList is 0.

My font class is a slight variation of the nehe code. It is:

lh_text::lh_text(char *font_name, HDC hDC){ // Create the font in the constructor

device_context = hDC; // Set device context
HFONT font; // Windows Font ID
font_display_list = glGenLists(96); // Storage For 96 Characters

// ERROR CHECKING LIST BASE -- 0 indicates an error
char str[255];
sprintf (str, "%u", font_display_list);
MessageBox (NULL, str, "ALERT", MB_OK);

font = CreateFont( -16, // Height Of Font
8, // Width Of Font
0, // Angle Of Escapement
0, // Orientation Angle
FW_BOLD, // Font Weight
FALSE, // Italic
FALSE, // Underline
FALSE, // Strikeout
ANSI_CHARSET, // Character Set Identifier
OUT_TT_PRECIS, // Output Precision
CLIP_DEFAULT_PRECIS, // Clipping Precision
font_name); // Font Name

SelectObject (device_context, font); // Selects The Font We Want
wglUseFontBitmaps (device_context, 32, 96, font_display_list); // Builds 96 Characters Starting At Character 32

} // end constructor

However, when I create a static instance of this class from within my draw function, the glGenList call generates a valid number, and everything works fine. I am not sure why this is happening -- does anyone happen to have any ideas??

Thanks http://www.opengl.org/discussion_boards/ubb/smile.gif

lost hope
01-18-2002, 10:43 AM
Ah, I think I got it -- the rendering context must not be set up when I try to call glGenLists. That would explain the behavior I am getting.