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/teximage.c b/progs/perf/teximage.c
index 634cd835588..86f0ef87366 100644
--- a/progs/perf/teximage.c
+++ b/progs/perf/teximage.c
@@ -155,6 +155,10 @@ static const struct {
    { 0, 0, NULL }
 };
 
+void
+PerfNextRound(void)
+{
+}
 
 
 /** Called from test harness/main */