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authorKeith Whitwell <keith@tungstengraphics.com>2002-10-31 12:38:32 +0000
committerKeith Whitwell <keith@tungstengraphics.com>2002-10-31 12:38:32 +0000
commit9627ed0631240044bbcf0f071d635c08b853ae4d (patch)
treee056ff270683033031b4fe6c4f35a51e9b4c3540 /progs/demos
parent8d439768589ca61b24c006c2fdb21401d4de67ec (diff)
Add a note about window map behaviour and the autotuning of nr of loops which
can conspire to make it look like clearspd is exposing an intermittent driver bug...
Diffstat (limited to 'progs/demos')
-rw-r--r--progs/demos/clearspd.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/progs/demos/clearspd.c b/progs/demos/clearspd.c
index 706e698bd9..c9a4e2630f 100644
--- a/progs/demos/clearspd.c
+++ b/progs/demos/clearspd.c
@@ -1,4 +1,4 @@
-/* $Id: clearspd.c,v 1.4 2002/04/22 16:03:37 brianp Exp $ */
+/* $Id: clearspd.c,v 1.5 2002/10/31 12:38:32 keithw Exp $ */
/*
* Simple GLUT program to measure glClear() and glutSwapBuffers() speed.
@@ -61,6 +61,12 @@ static void Display( void )
glutSwapBuffers();
}
+ /* NOTE: If clearspd doesn't map it's window immediately on
+ * starting, swaps will be istantaneous, so this will send Loops
+ * towards infinity. When a window is finally mapped, it may be
+ * minutes before the first call to glutSwapBuffers, making it look
+ * like there's a driver bug.
+ */
if (t1-t0 < MinPeriod) {
/* Next time do more clears to get longer elapsed time */
Loops *= 2;