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/*
* Copyright © 2012 Marek Olšák <maraeo@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "piglit-util-gl.h"
#include <inttypes.h> /* for PRIu64 macro */
#ifdef HAVE_UNISTD_H
#include <unistd.h> /* for usleep */
#endif
/* GL_TIMESTAMP isn't expected to be reliable for measuring long durations and
* although the ARB_timer_query spec doesn't stipulate what kind of drifting
* from wall clock time is acceptable, we at least want a sanity check that
* things look reasonable...
*/
#define DRIFT_NS_PER_SEC_THRESHOLD 3000000
/**
* @file timestamp-get.c
*
* Test that GL_TIMESTAMP obtained via glGet and glQuery returns roughly
* the same value, and that durations measured via GL_TIMESTAMP have
* nanosecond units.
*/
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
config.khr_no_error_support = PIGLIT_NO_ERRORS;
PIGLIT_GL_TEST_CONFIG_END
static GLint64
get_gpu_time_via_query(GLuint q)
{
GLint64 time;
glQueryCounter(q, GL_TIMESTAMP);
glGetQueryObjecti64v(q, GL_QUERY_RESULT, &time);
return time;
}
static GLint64
get_gpu_time_via_get(GLuint q)
{
GLint64 time;
glGetInteger64v(GL_TIMESTAMP, &time);
return time;
}
static void
validate_times(GLint64 t1, GLint64 t2, GLint64 tolerance)
{
if (t1 > t2) {
printf("old time = %" PRIu64 " us\n", (uint64_t) t1 / 1000);
printf("new time = %" PRIu64 " us\n", (uint64_t) t2 / 1000);
puts("old time > new time");
piglit_report_result(PIGLIT_FAIL);
}
/* the tolerance of 1 milisecond seems to be sufficient */
if (t2 - t1 > tolerance) {
printf("time 1 = %" PRIu64 " us\n", (uint64_t) t1 / 1000);
printf("time 2 = %" PRIu64 " us\n", (uint64_t) t2 / 1000);
puts("too big difference");
piglit_report_result(PIGLIT_FAIL);
}
}
static void
validate_delta(GLint64 gl_ts1, GLint64 gl_ts2, GLint64 cpu_delay_ns)
{
GLint64 gl_ts_delta = gl_ts2 - gl_ts1;
int64_t drift = llabs(cpu_delay_ns - gl_ts_delta);
int64_t drift_per_sec = drift * 1000000000LL / cpu_delay_ns;
/* XXX: technically we shouldn't be as strict about drift when the gpu
* clock is running fast and the duration is longer than expected,
* because we can't easily exclude other factors like OS scheduling
* affecting the measurements. For now though we don't take this into
* account.
*/
if (drift_per_sec > DRIFT_NS_PER_SEC_THRESHOLD) {
printf("GL_TIMESTAMP 1 = %" PRId64 " us\n", gl_ts1 / 1000);
printf("GL_TIMESTAMP 2 = %" PRId64 " us\n", gl_ts2 / 1000);
printf("delta = %" PRId64 " us (expect >= %"PRId64" us)\n",
gl_ts_delta / 1000, cpu_delay_ns / 1000);
piglit_loge("GL_TIMESTAMP drift of %" PRId64 " ns/sec, greater than %" PRId64 " ns/sec",
drift_per_sec,
(int64_t)DRIFT_NS_PER_SEC_THRESHOLD);
piglit_report_result(PIGLIT_FAIL);
} else
printf("GL_TIMESTAMP drift of approx. %" PRId64 " ns/sec\n",
drift_per_sec);
}
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);
piglit_delay_ns(10000000);
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;
}
void
piglit_init(int argc, char **argv)
{
piglit_automatic = true;
piglit_require_gl_version(20);
piglit_require_extension("GL_ARB_timer_query");
}
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