C++ (Cpp) get_gpu_time_via_query Examples

Example #1

File: timestamp-get.c Project: aphogat/piglit

enum piglit_result
piglit_display(void)
{
	GLint64 t1, t2;
	GLint64 query_overhead, get_overhead, tolerance;
	GLuint q;

	glGenQueries(1, &q);

	/* this creates the query in the driver */
	get_gpu_time_via_query(q);

	/* compute a reasonable tolerance based on driver overhead */
	t1 = get_cpu_time();
	get_gpu_time_via_query(q);
	query_overhead = get_cpu_time() - t1;

	t1 = get_cpu_time();
	get_gpu_time_via_get(q);
	get_overhead = get_cpu_time() - t1;

	printf("glGet overhead: %llu us\n", (unsigned long long) get_overhead / 1000);
	printf("glQuery overhead: %llu us\n", (unsigned long long) query_overhead / 1000);

	/* minimum tolerance is 3 ms */
	tolerance = query_overhead + get_overhead + 3000000;

	/* do testing */
	puts("Test: first glQuery, then glGet");
	t1 = get_gpu_time_via_query(q);
	t2 = get_gpu_time_via_get(q);
	validate_times(t1, t2, tolerance);

	usleep(10000);

	puts("Test: first glGet, then glQuery");
	t1 = get_gpu_time_via_get(q);
	t2 = get_gpu_time_via_query(q);
	validate_times(t1, t2, tolerance);

	glDeleteQueries(1, &q);

	return PIGLIT_PASS;
}

Example #2

enum piglit_result
piglit_display(void)
{
	GLint64 t1, t2;
	GLint64 query_overhead, get_overhead, tolerance;
	GLuint q;
	int64_t delay;

	glGenQueries(1, &q);

	/* this creates the query in the driver */
	get_gpu_time_via_query(q);

	/* compute a reasonable tolerance based on driver overhead */
	t1 = piglit_time_get_nano();
	get_gpu_time_via_query(q);
	query_overhead = piglit_time_get_nano() - t1;

	t1 = piglit_time_get_nano();
	get_gpu_time_via_get(q);
	get_overhead = piglit_time_get_nano() - t1;

	printf("glGet overhead: %" PRIu64 " us\n", (uint64_t) get_overhead / 1000);
	printf("glQuery overhead: %" PRIu64 " us\n", (uint64_t) query_overhead / 1000);

	/* minimum tolerance is 3 ms */
	tolerance = query_overhead + get_overhead + 3000000;

	/* do testing */
	puts("Test: first glQuery, then glGet");
	t1 = get_gpu_time_via_query(q);
	t2 = get_gpu_time_via_get(q);
	validate_times(t1, t2, tolerance);

	usleep(10000);

	puts("Test: first glGet, then glQuery");
	t1 = get_gpu_time_via_get(q);
	t2 = get_gpu_time_via_query(q);
	validate_times(t1, t2, tolerance);

	puts("Test: wall clock time via glQuery");
	t1 = get_gpu_time_via_query(q);
	delay = piglit_delay_ns(1000000000);
	t2 = get_gpu_time_via_query(q);
	validate_delta(t1, t2, delay);

	puts("Test: wall clock time via glGet");
	t1 = get_gpu_time_via_get(q);
	delay = piglit_delay_ns(1000000000);
	t2 = get_gpu_time_via_get(q);
	validate_delta(t1, t2, delay);

	glDeleteQueries(1, &q);

	return PIGLIT_PASS;
}