http://packetstormsecurity.org/UNIX/admin/xscreensaver-3.29.tar.gz

[xscreensaver] / hacks / glx / xlock-gl.c

diff --git a/hacks/glx/xlock-gl.c b/hacks/glx/xlock-gl.c
index 8250e79cd125eff60cf35daab9424d6357ba0e9b..553a2cdd30242214b7d6163ba715240185f3844a 100644 (file)
--- a/hacks/glx/xlock-gl.c
+++ b/hacks/glx/xlock-gl.c
@@ -19,6 +19,7 @@
 #include "xlockmoreI.h"
 
 #include <GL/gl.h>
+#include <GL/glu.h>
 #include <GL/glx.h>
 
 /* Gag -- we use this to turn X errors from glXCreateContext() into
@@ -136,3 +137,162 @@ check_gl_error (const char *type)
   fprintf (stderr, "%s: %s error: %s\n", progname, type, e);
   exit (1);
 }
+
+
+\f
+
+/* Frames-per-second statistics */
+
+static int fps_text_x = 10;
+static int fps_text_y = 10;
+static int fps_sample_frames = 10;
+static GLuint font_dlist;
+
+static void
+fps_init (ModeInfo *mi)
+{
+  const char *font = get_string_resource ("fpsFont", "Font");
+  XFontStruct *f;
+  Font id;
+  int first, last;
+
+  if (!font) font = "-*-courier-bold-r-normal-*-180-*";
+  f = XLoadQueryFont(mi->dpy, font);
+  if (!f) f = XLoadQueryFont(mi->dpy, "fixed");
+
+  id = f->fid;
+  first = f->min_char_or_byte2;
+  last = f->max_char_or_byte2;
+  
+  clear_gl_error ();
+  font_dlist = glGenLists ((GLuint) last+1);
+  check_gl_error ("glGenLists");
+
+  if (get_boolean_resource ("fpsTop", "FPSTop"))
+    fps_text_y = - (f->ascent + 10);
+
+  glXUseXFont(id, first, last-first+1, font_dlist + first);
+  check_gl_error ("glXUseXFont");
+}
+
+
+static void
+fps_print_string (ModeInfo *mi, GLfloat x, GLfloat y, const char *string)
+{
+  int i;
+  /* save the current state */
+  /* note: could be expensive! */
+
+  if (y < 0)
+    y = mi->xgwa.height + y;
+
+  clear_gl_error ();
+  glPushAttrib(GL_ALL_ATTRIB_BITS);
+  {
+    check_gl_error ("glPushAttrib");
+
+    /* disable lighting and texturing when drawing bitmaps!
+       (glPopAttrib() restores these, I believe.)
+     */
+    glDisable(GL_TEXTURE_2D);
+    glDisable(GL_LIGHTING);
+    glDisable(GL_BLEND);
+
+    /* glPopAttrib() does not restore matrix changes, so we must
+       push/pop the matrix stacks to be non-intrusive there.
+     */
+    glMatrixMode(GL_PROJECTION);
+    glPushMatrix();
+    {
+      check_gl_error ("glPushMatrix");
+      glLoadIdentity();
+
+      /* Each matrix mode has its own stack, so we need to push/pop
+         them separately. */
+      glMatrixMode(GL_MODELVIEW);
+      glPushMatrix();
+      {
+        check_gl_error ("glPushMatrix");
+        glLoadIdentity();
+
+        gluOrtho2D(0, mi->xgwa.width, 0, mi->xgwa.height);
+        check_gl_error ("gluOrtho2D");
+
+        /* draw the text */
+        glColor3f (1, 1, 1);
+        glRasterPos2f (x, y);
+        for (i = 0; i < strlen(string); i++)
+          glCallList (font_dlist + (int)string[i]);
+
+        check_gl_error ("fps_print_string");
+      }
+      glPopMatrix();
+    }
+    glMatrixMode(GL_PROJECTION);
+    glPopMatrix();
+
+  }
+  /* clean up after our state changes */
+  glPopAttrib();
+  check_gl_error ("glPopAttrib");
+}
+
+
+void
+do_fps (ModeInfo *mi)
+{
+  /* every N frames, get the time and use it to get the frames per second */
+  static int frame_counter = -1;
+  static double oldtime = 0; /* time in usecs, as a double */
+  static double newtime = 0;
+
+  static char msg [1024] = { 0, };
+
+  if (frame_counter == -1)
+    {
+      fps_init (mi);
+      frame_counter = fps_sample_frames;
+    }
+
+  if (frame_counter++ == fps_sample_frames)
+    {
+      double fps;
+      struct timeval now;
+# ifdef GETTIMEOFDAY_TWO_ARGS
+      struct timezone tzp;
+      gettimeofday(&now, &tzp);
+# else
+      gettimeofday(&now);
+# endif
+
+      oldtime = newtime;
+      newtime = now.tv_sec + ((double) now.tv_usec * 0.000001);
+
+      fps = fps_sample_frames / (newtime - oldtime);
+
+      if (fps < 0.0001)
+        {
+          strcpy(msg, "FPS: (accumulating...)");
+        }
+      else
+        {
+          sprintf(msg, "FPS: %.02f", fps);
+
+          if (mi->pause != 0)
+            {
+              char buf[40];
+              sprintf(buf, "%f", mi->pause / 1000000.0); /* FTSO C */
+              while(*buf && buf[strlen(buf)-1] == '0')
+                buf[strlen(buf)-1] = 0;
+              if (buf[strlen(buf)-1] == '.')
+                buf[strlen(buf)-1] = 0;
+              sprintf(msg + strlen(msg), " (including %s sec/frame delay)",
+                      buf);
+            }
+        }
+
+      frame_counter = 0;
+    }
+
+  fps_print_string (mi, fps_text_x, fps_text_y, msg);
+}