progs/perf: add first attempt at a swapbuffers rate test

This is pretty ugly as the original framework assumed you'd set
a single window size at startup and keep it throughout, but for
swapbuffers you want to test the rate at various window sizes.

With luck a nicer solution can be found, but this at least lays out
a marker.

1 files changed, 4 insertions, 0 deletions

diff --git a/progs/perf/drawoverhead.c b/progs/perf/drawoverhead.c
index d581f4b187..0de549b0dc 100644
--- a/progs/perf/drawoverhead.c
+++ b/progs/perf/drawoverhead.c
@@ -108,6 +108,10 @@ DrawStateChange(unsigned count)
    glFinish();
 }
 
+void
+PerfNextRound(void)
+{
+}
 
 /** Called from test harness/main */
 void