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-rw-r--r--samples/OpenGL/compute_shader/stats.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/samples/OpenGL/compute_shader/stats.c b/samples/OpenGL/compute_shader/stats.c
new file mode 100644
index 0000000..1cf7fcb
--- /dev/null
+++ b/samples/OpenGL/compute_shader/stats.c
@@ -0,0 +1,25 @@
+#include "stats.h"
+
+void stats_running_reset(struct stats_running *s)
+{
+ if( s ) {
+ s->n = 0;
+ s->S = NAN;
+ s->m = NAN;
+ }
+}
+
+void stats_running_push(struct stats_running *s, double value)
+{
+ if( s && isfinite(value) ) {
+ double const m_prev = 0 < s->n ? s->m : 0.;
+ double const S_prev = 1 < s->n ? s->S : 0.;
+ unsigned const n = (s->n += 1);
+
+ s->m = m_prev + (value - m_prev) / n;
+ if( 1 < n ) {
+ /* variance is defined only for n > 1 */
+ s->S = S_prev + (value - s->m) * (value - m_prev);
+ }
+ }
+}