1 /* fps, Copyright (c) 2001-2009 Jamie Zawinski <jwz@jwz.org>
2 * Draw a frames-per-second display (Xlib and OpenGL).
4 * Permission to use, copy, modify, distribute, and sell this software and its
5 * documentation for any purpose is hereby granted without fee, provided that
6 * the above copyright notice appear in all copies and that both that
7 * copyright notice and this permission notice appear in supporting
8 * documentation. No representations are made about the suitability of this
9 * software for any purpose. It is provided "as is" without express or
15 #endif /* HAVE_CONFIG_H */
19 # include <OpenGL/gl.h>
20 # include <OpenGL/glu.h>
22 #else /* !HAVE_COCOA -- real Xlib */
25 #endif /* !HAVE_COCOA */
27 #include "xlockmoreI.h"
31 /* These are in xlock-gl.c */
32 extern void clear_gl_error (void);
33 extern void check_gl_error (const char *type);
37 xlockmore_gl_fps_init (fps_state *st)
39 XFontStruct *f = st->font;
40 int first = f->min_char_or_byte2;
41 int last = f->max_char_or_byte2;
44 st->font_dlist = glGenLists ((GLuint) last+1);
45 check_gl_error ("glGenLists");
47 xscreensaver_glXUseXFont (st->dpy, f->fid,
48 first, last-first+1, st->font_dlist + first);
49 check_gl_error ("xscreensaver_glXUseXFont");
54 /* Callback in xscreensaver_function_table, via xlockmore.c.
57 xlockmore_gl_compute_fps (Display *dpy, Window w, fps_state *fpst,
60 ModeInfo *mi = (ModeInfo *) closure;
64 xlockmore_gl_fps_init (fpst);
67 fps_compute (fpst, mi->polygon_count);
71 /* Called directly from GL programs (as `do_fps') before swapping buffers.
74 xlockmore_gl_draw_fps (ModeInfo *mi)
76 fps_state *st = mi->fpst;
77 if (st) /* might be too early */
79 XWindowAttributes xgwa;
82 int lh = st->font->ascent + st->font->descent;
85 XGetWindowAttributes (st->dpy, st->window, &xgwa);
86 for (s = st->string; *s; s++)
87 if (*s == '\n') lines++;
90 y = xgwa.height + y - lines*lh;
91 y += lines*lh + st->font->descent;
94 print_gl_string (st->dpy, st->font, st->font_dlist,
95 xgwa.width, xgwa.height,
96 st->x, y, st->string, st->clear_p);