[Piglit] [PATCH 07/12] arb_timer_query: use piglit_time_get_nano

[Emil Velikov]

The above uses clock_gettime(CLOCK_MONOTONIC) (when available) rather
than gettimeofday(). The former has greather precision and could help
with the inconsintent results that people are getting.

Signed-off-by: Emil Velikov <emil.l.veli...@gmail.com>
---
 tests/spec/arb_timer_query/timestamp-get.c | 31 ++++--------------------------
 1 file changed, 4 insertions(+), 27 deletions(-)

diff --git a/tests/spec/arb_timer_query/timestamp-get.c 
b/tests/spec/arb_timer_query/timestamp-get.c
index e09a54c..6a7ee5a 100644
--- a/tests/spec/arb_timer_query/timestamp-get.c
+++ b/tests/spec/arb_timer_query/timestamp-get.c
@@ -24,10 +24,6 @@
 #include "piglit-util-gl.h"
 
 #include <inttypes.h>  /* for PRIu64 macro */
-#if !defined(_WIN32) && !defined(WIN32)
-#include <unistd.h>
-#include <sys/time.h>
-#endif
 
 /**
  * @file timestamp-get.c
@@ -62,25 +58,6 @@ get_gpu_time_via_get(GLuint q)
        return time;
 }
 
-static GLint64
-get_cpu_time(void)
-{
-#if defined(_WIN32) || defined(WIN32)
-       static LARGE_INTEGER frequency;
-       LARGE_INTEGER counter;
-
-       if(!frequency.QuadPart)
-               QueryPerformanceFrequency(&frequency);
-       QueryPerformanceCounter(&counter);
-       return (GLint64)(counter.QuadPart * 
INT64_C(1000000000)/frequency.QuadPart);
-#else
-       struct timeval tv;
-
-       gettimeofday(&tv, 0);
-       return (GLint64)tv.tv_sec * 1000000000 + (GLint64)tv.tv_usec * 1000;
-#endif
-}
-
 static void
 validate_times(GLint64 t1, GLint64 t2, GLint64 tolerance)
 {
@@ -113,13 +90,13 @@ piglit_display(void)
        get_gpu_time_via_query(q);
 
        /* compute a reasonable tolerance based on driver overhead */
-       t1 = get_cpu_time();
+       t1 = piglit_time_get_nano();
        get_gpu_time_via_query(q);
-       query_overhead = get_cpu_time() - t1;
+       query_overhead = piglit_time_get_nano() - t1;
 
-       t1 = get_cpu_time();
+       t1 = piglit_time_get_nano();
        get_gpu_time_via_get(q);
-       get_overhead = get_cpu_time() - t1;
+       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);
-- 
2.1.3

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