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author Miodrag Milanovic <mmicko@gmail.com>2016-02-27 16:28:05 +0100
committer Miodrag Milanovic <mmicko@gmail.com>2016-02-27 16:53:49 +0100
commitcf6dc7d370407914020f3e623719f09c8668c692 (patch)
tree46b3416d091b4c09b50fba7ffcbd310aed032cc8 /3rdparty/SDL2/src/timer/unix/SDL_systimer.c
parent64135e73f973d9b95beb0c60b65feb34fbfec64a (diff)
Placed SDL2 source since we need it on some platforms (nw)
Diffstat (limited to '3rdparty/SDL2/src/timer/unix/SDL_systimer.c')
-rw-r--r--3rdparty/SDL2/src/timer/unix/SDL_systimer.c231
1 files changed, 231 insertions, 0 deletions
diff --git a/3rdparty/SDL2/src/timer/unix/SDL_systimer.c b/3rdparty/SDL2/src/timer/unix/SDL_systimer.c
new file mode 100644
index 00000000000..217fe327fa9
--- /dev/null
+++ b/3rdparty/SDL2/src/timer/unix/SDL_systimer.c
@@ -0,0 +1,231 @@
+/*
+ Simple DirectMedia Layer
+ Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
+
+ This software is provided 'as-is', without any express or implied
+ warranty. In no event will the authors be held liable for any damages
+ arising from the use of this software.
+
+ Permission is granted to anyone to use this software for any purpose,
+ including commercial applications, and to alter it and redistribute it
+ freely, subject to the following restrictions:
+
+ 1. The origin of this software must not be misrepresented; you must not
+ claim that you wrote the original software. If you use this software
+ in a product, an acknowledgment in the product documentation would be
+ appreciated but is not required.
+ 2. Altered source versions must be plainly marked as such, and must not be
+ misrepresented as being the original software.
+ 3. This notice may not be removed or altered from any source distribution.
+*/
+#include "../../SDL_internal.h"
+
+#ifdef SDL_TIMER_UNIX
+
+#include <stdio.h>
+#include <sys/time.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "SDL_timer.h"
+#include "SDL_assert.h"
+
+/* The clock_gettime provides monotonous time, so we should use it if
+ it's available. The clock_gettime function is behind ifdef
+ for __USE_POSIX199309
+ Tommi Kyntola (tommi.kyntola@ray.fi) 27/09/2005
+*/
+/* Reworked monotonic clock to not assume the current system has one
+ as not all linux kernels provide a monotonic clock (yeah recent ones
+ probably do)
+ Also added OS X Monotonic clock support
+ Based on work in https://github.com/ThomasHabets/monotonic_clock
+ */
+#if HAVE_NANOSLEEP || HAVE_CLOCK_GETTIME
+#include <time.h>
+#endif
+#ifdef __APPLE__
+#include <mach/mach_time.h>
+#endif
+
+/* Use CLOCK_MONOTONIC_RAW, if available, which is not subject to adjustment by NTP */
+#if HAVE_CLOCK_GETTIME
+#ifdef CLOCK_MONOTONIC_RAW
+#define SDL_MONOTONIC_CLOCK CLOCK_MONOTONIC_RAW
+#else
+#define SDL_MONOTONIC_CLOCK CLOCK_MONOTONIC
+#endif
+#endif
+
+/* The first ticks value of the application */
+#if HAVE_CLOCK_GETTIME
+static struct timespec start_ts;
+#elif defined(__APPLE__)
+static uint64_t start_mach;
+mach_timebase_info_data_t mach_base_info;
+#endif
+static SDL_bool has_monotonic_time = SDL_FALSE;
+static struct timeval start_tv;
+static SDL_bool ticks_started = SDL_FALSE;
+
+void
+SDL_TicksInit(void)
+{
+ if (ticks_started) {
+ return;
+ }
+ ticks_started = SDL_TRUE;
+
+ /* Set first ticks value */
+#if HAVE_CLOCK_GETTIME
+ if (clock_gettime(SDL_MONOTONIC_CLOCK, &start_ts) == 0) {
+ has_monotonic_time = SDL_TRUE;
+ } else
+#elif defined(__APPLE__)
+ kern_return_t ret = mach_timebase_info(&mach_base_info);
+ if (ret == 0) {
+ has_monotonic_time = SDL_TRUE;
+ start_mach = mach_absolute_time();
+ } else
+#endif
+ {
+ gettimeofday(&start_tv, NULL);
+ }
+}
+
+void
+SDL_TicksQuit(void)
+{
+ ticks_started = SDL_FALSE;
+}
+
+Uint32
+SDL_GetTicks(void)
+{
+ Uint32 ticks;
+ if (!ticks_started) {
+ SDL_TicksInit();
+ }
+
+ if (has_monotonic_time) {
+#if HAVE_CLOCK_GETTIME
+ struct timespec now;
+ clock_gettime(SDL_MONOTONIC_CLOCK, &now);
+ ticks = (now.tv_sec - start_ts.tv_sec) * 1000 + (now.tv_nsec -
+ start_ts.tv_nsec) / 1000000;
+#elif defined(__APPLE__)
+ uint64_t now = mach_absolute_time();
+ ticks = (Uint32)((((now - start_mach) * mach_base_info.numer) / mach_base_info.denom) / 1000000);
+#else
+ SDL_assert(SDL_FALSE);
+ ticks = 0;
+#endif
+ } else {
+ struct timeval now;
+
+ gettimeofday(&now, NULL);
+ ticks = (Uint32)((now.tv_sec - start_tv.tv_sec) * 1000 + (now.tv_usec - start_tv.tv_usec) / 1000);
+ }
+ return (ticks);
+}
+
+Uint64
+SDL_GetPerformanceCounter(void)
+{
+ Uint64 ticks;
+ if (!ticks_started) {
+ SDL_TicksInit();
+ }
+
+ if (has_monotonic_time) {
+#if HAVE_CLOCK_GETTIME
+ struct timespec now;
+
+ clock_gettime(SDL_MONOTONIC_CLOCK, &now);
+ ticks = now.tv_sec;
+ ticks *= 1000000000;
+ ticks += now.tv_nsec;
+#elif defined(__APPLE__)
+ ticks = mach_absolute_time();
+#else
+ SDL_assert(SDL_FALSE);
+ ticks = 0;
+#endif
+ } else {
+ struct timeval now;
+
+ gettimeofday(&now, NULL);
+ ticks = now.tv_sec;
+ ticks *= 1000000;
+ ticks += now.tv_usec;
+ }
+ return (ticks);
+}
+
+Uint64
+SDL_GetPerformanceFrequency(void)
+{
+ if (!ticks_started) {
+ SDL_TicksInit();
+ }
+
+ if (has_monotonic_time) {
+#if HAVE_CLOCK_GETTIME
+ return 1000000000;
+#elif defined(__APPLE__)
+ Uint64 freq = mach_base_info.denom;
+ freq *= 1000000000;
+ freq /= mach_base_info.numer;
+ return freq;
+#endif
+ }
+
+ return 1000000;
+}
+
+void
+SDL_Delay(Uint32 ms)
+{
+ int was_error;
+
+#if HAVE_NANOSLEEP
+ struct timespec elapsed, tv;
+#else
+ struct timeval tv;
+ Uint32 then, now, elapsed;
+#endif
+
+ /* Set the timeout interval */
+#if HAVE_NANOSLEEP
+ elapsed.tv_sec = ms / 1000;
+ elapsed.tv_nsec = (ms % 1000) * 1000000;
+#else
+ then = SDL_GetTicks();
+#endif
+ do {
+ errno = 0;
+
+#if HAVE_NANOSLEEP
+ tv.tv_sec = elapsed.tv_sec;
+ tv.tv_nsec = elapsed.tv_nsec;
+ was_error = nanosleep(&tv, &elapsed);
+#else
+ /* Calculate the time interval left (in case of interrupt) */
+ now = SDL_GetTicks();
+ elapsed = (now - then);
+ then = now;
+ if (elapsed >= ms) {
+ break;
+ }
+ ms -= elapsed;
+ tv.tv_sec = ms / 1000;
+ tv.tv_usec = (ms % 1000) * 1000;
+
+ was_error = select(0, NULL, NULL, NULL, &tv);
+#endif /* HAVE_NANOSLEEP */
+ } while (was_error && (errno == EINTR));
+}
+
+#endif /* SDL_TIMER_UNIX */
+
+/* vi: set ts=4 sw=4 expandtab: */