http://packetstormsecurity.org/UNIX/admin/xscreensaver-3.31.tar.gz

[xscreensaver] / hacks / glx / fps.c

diff --git a/hacks/glx/fps.c b/hacks/glx/fps.c
new file mode 100644 (file)
index 0000000..e7adec3
--- /dev/null
+++ b/hacks/glx/fps.c
@@ -0,0 +1,196 @@
+/* tube, Copyright (c) 2001 Jamie Zawinski <jwz@jwz.org>
+ * Utility function to draw a frames-per-second display.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that
+ * copyright notice and this permission notice appear in supporting
+ * documentation.  No representations are made about the suitability of this
+ * software for any purpose.  It is provided "as is" without express or 
+ * implied warranty.
+ */
+
+#include "config.h"
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "screenhack.h"
+#include "xlockmoreI.h"
+
+#include <GL/gl.h>
+#include <GL/glu.h>
+#include <GL/glx.h>
+
+extern void clear_gl_error (void);
+extern void check_gl_error (const char *type);
+
+static int fps_text_x = 10;
+static int fps_text_y = 10;
+static int fps_ascent, fps_descent;
+static int fps_sample_frames = 10;
+static GLuint font_dlist;
+static Bool fps_clear_p = False;
+
+static void
+fps_init (ModeInfo *mi)
+{
+  const char *font = get_string_resource ("fpsFont", "Font");
+  XFontStruct *f;
+  Font id;
+  int first, last;
+
+  fps_clear_p = get_boolean_resource ("fpsSolid", "FPSSolid");
+
+  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");
+
+  fps_ascent = f->ascent;
+  fps_descent = f->descent;
+
+  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);
+    glDisable(GL_DEPTH_TEST);
+
+    /* 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");
+
+        /* clear the background */
+        if (fps_clear_p)
+          {
+            glColor3f (0, 0, 0);
+            glRecti (x, y - fps_descent,
+                     mi->xgwa.width - x,
+                     y + fps_ascent + fps_descent);
+          }
+
+        /* 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);
+}