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