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#include <stdio.h>
#include "emscripten.h"
#ifndef REPORT_RESULT
// To be able to run this test outside the browser harness in node.js/spidermonkey:
#define REPORT_RESULT int dummy
#endif
int result = 0;
int main() {
// This code tests three things:
// a) Calling emscripten_get_now(), time actually proceeds.
// b) Values returned by emscripten_get_now() are strictly nondecreasing.
// c) emscripten_get_now() is able to return sub-millisecond precision timer values.
bool detected_good_timer_precision = false;
double smallest_delta = 0.f;
for(int x = 0; x < 1000; ++x) { // Have several attempts to find a good small delta, i.e. give time to JS engine to warm up the code and so on.
double t = emscripten_get_now();
double t2 = emscripten_get_now();
for(int i = 0; i < 100 && t == t2; ++i) {
t2 = emscripten_get_now();
}
if (t2 < t && t2 - t < 1000.f) { // Timer must be monotonous.
printf("Timer is not monotonous!\\n");
smallest_delta = t2 - t;
break;
}
if (t2 > t && t2 - t < 0.7f) { // Must pass less than a millisecond between two calls.
detected_good_timer_precision = true;
smallest_delta = t2 - t;
break;
}
}
if (detected_good_timer_precision) {
printf("Timer resolution is good. (%f msecs)\\n", smallest_delta);
result = 1;
} else {
printf("Error: Bad timer precision: Smallest timer delta: %f msecs\\n", smallest_delta);
result = 0;
}
REPORT_RESULT();
return 0;
}
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