Initial commit

1 files changed, 188 insertions, 0 deletions

diff --git a/contrib/SDL-3.2.8/src/timer/unix/SDL_systimer.c b/contrib/SDL-3.2.8/src/timer/unix/SDL_systimer.c
new file mode 100644
index 0000000..0f96319
--- /dev/null
+++ b/contrib/SDL-3.2.8/src/timer/unix/SDL_systimer.c
@@ -0,0 +1,188 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2025 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_c.h"
+
+#ifdef SDL_PLATFORM_EMSCRIPTEN
+#include <emscripten.h>
+#endif
+
+/* 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 macOS Monotonic clock support
+   Based on work in https://github.com/ThomasHabets/monotonic_clock
+ */
+#if defined(HAVE_NANOSLEEP) || defined(HAVE_CLOCK_GETTIME)
+#include <time.h>
+#endif
+#ifdef SDL_PLATFORM_APPLE
+#include <mach/mach_time.h>
+#endif
+
+// Use CLOCK_MONOTONIC_RAW, if available, which is not subject to adjustment by NTP
+#ifdef 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 !defined(HAVE_CLOCK_GETTIME) && defined(SDL_PLATFORM_APPLE)
+mach_timebase_info_data_t mach_base_info;
+#endif
+static bool checked_monotonic_time = false;
+static bool has_monotonic_time = false;
+
+static void CheckMonotonicTime(void)
+{
+#ifdef HAVE_CLOCK_GETTIME
+    struct timespec value;
+    if (clock_gettime(SDL_MONOTONIC_CLOCK, &value) == 0) {
+        has_monotonic_time = true;
+    }
+#elif defined(SDL_PLATFORM_APPLE)
+    if (mach_timebase_info(&mach_base_info) == 0) {
+        has_monotonic_time = true;
+    }
+#endif
+    checked_monotonic_time = true;
+}
+
+Uint64 SDL_GetPerformanceCounter(void)
+{
+    Uint64 ticks;
+
+    if (!checked_monotonic_time) {
+        CheckMonotonicTime();
+    }
+
+    if (has_monotonic_time) {
+#ifdef HAVE_CLOCK_GETTIME
+        struct timespec now;
+
+        clock_gettime(SDL_MONOTONIC_CLOCK, &now);
+        ticks = now.tv_sec;
+        ticks *= SDL_NS_PER_SECOND;
+        ticks += now.tv_nsec;
+#elif defined(SDL_PLATFORM_APPLE)
+        ticks = mach_absolute_time();
+#else
+        SDL_assert(false);
+        ticks = 0;
+#endif
+    } else {
+        struct timeval now;
+
+        gettimeofday(&now, NULL);
+        ticks = now.tv_sec;
+        ticks *= SDL_US_PER_SECOND;
+        ticks += now.tv_usec;
+    }
+    return ticks;
+}
+
+Uint64 SDL_GetPerformanceFrequency(void)
+{
+    if (!checked_monotonic_time) {
+        CheckMonotonicTime();
+    }
+
+    if (has_monotonic_time) {
+#ifdef HAVE_CLOCK_GETTIME
+        return SDL_NS_PER_SECOND;
+#elif defined(SDL_PLATFORM_APPLE)
+        Uint64 freq = mach_base_info.denom;
+        freq *= SDL_NS_PER_SECOND;
+        freq /= mach_base_info.numer;
+        return freq;
+#endif
+    }
+
+    return SDL_US_PER_SECOND;
+}
+
+void SDL_SYS_DelayNS(Uint64 ns)
+{
+    int was_error;
+
+#ifdef HAVE_NANOSLEEP
+    struct timespec tv, remaining;
+#else
+    struct timeval tv;
+    Uint64 then, now, elapsed;
+#endif
+
+#ifdef SDL_PLATFORM_EMSCRIPTEN
+    if (emscripten_has_asyncify() && SDL_GetHintBoolean(SDL_HINT_EMSCRIPTEN_ASYNCIFY, true)) {
+        // pseudo-synchronous pause, used directly or through e.g. SDL_WaitEvent
+        emscripten_sleep(ns / SDL_NS_PER_MS);
+        return;
+    }
+#endif
+
+    // Set the timeout interval
+#ifdef HAVE_NANOSLEEP
+    remaining.tv_sec = (time_t)(ns / SDL_NS_PER_SECOND);
+    remaining.tv_nsec = (long)(ns % SDL_NS_PER_SECOND);
+#else
+    then = SDL_GetTicksNS();
+#endif
+    do {
+        errno = 0;
+
+#ifdef HAVE_NANOSLEEP
+        tv.tv_sec = remaining.tv_sec;
+        tv.tv_nsec = remaining.tv_nsec;
+        was_error = nanosleep(&tv, &remaining);
+#else
+        // Calculate the time interval left (in case of interrupt)
+        now = SDL_GetTicksNS();
+        elapsed = (now - then);
+        then = now;
+        if (elapsed >= ns) {
+            break;
+        }
+        ns -= elapsed;
+        tv.tv_sec = (ns / SDL_NS_PER_SECOND);
+        tv.tv_usec = SDL_NS_TO_US(ns % SDL_NS_PER_SECOND);
+
+        was_error = select(0, NULL, NULL, NULL, &tv);
+#endif // HAVE_NANOSLEEP
+    } while (was_error && (errno == EINTR));
+}
+
+#endif // SDL_TIMER_UNIX