/* Spencer Shimko
 * HW4: This code is not compilable as-is.  However it is utilized by my project to
 * select a valid X font and display text in a SDL/GL window.  SDL does not offer
 * the same built-in support for fonts that glut does, so this is a hackish work-
 * around.
 */
#include <GL/gl.h>
#include <GL/glu.h>
#include <X11/Intrinsic.h>


void initFont(GLuint base, char* f) {
   Display* display;
   XFontStruct* font_info;
   int first;
   int last;

   // Need an X Display before calling any Xlib routines.
   display = XOpenDisplay(0);
   if (display == 0) {
      fprintf(stderr, "XOpenDisplay() failed.  Exiting.\n");
      exit(-1);
   }
   else {

      // Load the font.
      font_info = XLoadQueryFont(display, f);
      if (!font_info) {
         fprintf(stderr, "XLoadQueryFont() failed - Exiting.\n");
         exit(-1);
      }
      else {
         // Tell GLX which font & glyphs to use.
         first = font_info->min_char_or_byte2;
         last  = font_info->max_char_or_byte2;
         glXUseXFont(font_info->fid, first, last-first+1, base+first);
      }
      XCloseDisplay(display);
      display = 0;
   }
}

//void drawText(GLfloat x, GLfloat y, char * msg){
void drawText(GLuint base, char* s)
{
   if (!glIsList(font_base)) {
         fprintf(stderr, "print_string(): Bad display list. - Exiting.\n");
   }
   else if (s && strlen(s)) {
      glPushAttrib(GL_LIST_BIT);
      glListBase(base);
      glCallLists(strlen(s), GL_UNSIGNED_BYTE, (GLubyte *)s);
      glPopAttrib();
   }
}