1 files changed, 98 insertions, 0 deletions
diff --git a/src/pl_clock.h b/src/pl_clock.h
new file mode 100644
index 0000000..541ef0b
--- /dev/null
+++ b/src/pl_clock.h
@@ -0,0 +1,98 @@
+/*
+ * This file is part of libplacebo.
+ *
+ * libplacebo is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * libplacebo is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with libplacebo. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <time.h>
+#include <stdint.h>
+
+#include "os.h"
+
+#ifdef PL_HAVE_WIN32
+# include <windows.h>
+# define PL_CLOCK_QPC
+#elif defined(PL_HAVE_APPLE)
+# include <Availability.h>
+# if (defined(__MAC_OS_X_VERSION_MIN_REQUIRED)  && __MAC_OS_X_VERSION_MIN_REQUIRED  < 101200) || \
+     (defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && __IPHONE_OS_VERSION_MIN_REQUIRED < 100000) || \
+     (defined(__TV_OS_VERSION_MIN_REQUIRED)     && __TV_OS_VERSION_MIN_REQUIRED     < 100000) || \
+     (defined(__WATCH_OS_VERSION_MIN_REQUIRED)  && __WATCH_OS_VERSION_MIN_REQUIRED  < 30000)  || \
+     !defined(CLOCK_MONOTONIC_RAW)
+#  include <mach/mach_time.h>
+#  define PL_CLOCK_MACH
+# else
+#  define PL_CLOCK_MONOTONIC_RAW
+# endif
+#elif defined(CLOCK_MONOTONIC_RAW)
+# define PL_CLOCK_MONOTONIC_RAW
+#elif defined(TIME_UTC)
+# define PL_CLOCK_TIMESPEC_GET
+#else
+# warning "pl_clock not implemented for this platform!"
+#endif
+
+typedef uint64_t pl_clock_t;
+
+static inline pl_clock_t pl_clock_now(void)
+{
+#if defined(PL_CLOCK_QPC)
+
+    LARGE_INTEGER counter;
+    QueryPerformanceCounter(&counter);
+    return counter.QuadPart;
+
+#elif defined(PL_CLOCK_MACH)
+
+    return mach_absolute_time();
+
+#else
+
+    struct timespec tp = { .tv_sec = 0, .tv_nsec = 0 };
+#if defined(PL_CLOCK_MONOTONIC_RAW)
+    clock_gettime(CLOCK_MONOTONIC_RAW, &tp);
+#elif defined(PL_CLOCK_TIMESPEC_GET)
+    timespec_get(&tp, TIME_UTC);
+#endif
+    return tp.tv_sec * UINT64_C(1000000000) + tp.tv_nsec;
+
+#endif
+}
+
+static inline double pl_clock_diff(pl_clock_t a, pl_clock_t b)
+{
+    double frequency = 1e9;
+
+#if defined(PL_CLOCK_QPC)
+
+    LARGE_INTEGER freq;
+    QueryPerformanceFrequency(&freq);
+    frequency = freq.QuadPart;
+
+#elif defined(PL_CLOCK_MACH)
+
+    mach_timebase_info_data_t time_base;
+    if (mach_timebase_info(&time_base) != KERN_SUCCESS)
+        return 0;
+    frequency = (time_base.denom * 1e9) / time_base.numer;
+
+#endif
+
+    if (b > a)
+        return (b - a) / -frequency;
+    else
+        return (a - b) / frequency;
+}