From b86f6631d7fd7a332e33496e1e89614e2644f60e Mon Sep 17 00:00:00 2001
From: Martin Ridgers <martin.ridgers@epicgames.com>
Date: Tue, 14 Sep 2021 16:32:53 +0200
Subject: Timer API implementation for Linux

---
 zencore/timer.cpp | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

(limited to 'zencore/timer.cpp')

diff --git a/zencore/timer.cpp b/zencore/timer.cpp
index ee8e1cf9c..f67822e73 100644
--- a/zencore/timer.cpp
+++ b/zencore/timer.cpp
@@ -3,26 +3,41 @@
 #include <doctest/doctest.h>
 #include <zencore/thread.h>
 #include <zencore/timer.h>
-#include <zencore/windows.h>
+#if ZEN_PLATFORM_WINDOWS
+#	include <zencore/windows.h>
+#elif ZEN_PLATFORM_LINUX
+#	include <time.h>
+#	include <unistd.h>
+#endif
 
 namespace zen {
 
 uint64_t
 GetHifreqTimerValue()
 {
+#if ZEN_PLATFORM_WINDOWS
 	LARGE_INTEGER li;
 	QueryPerformanceCounter(&li);
 
 	return li.QuadPart;
+#else
+	struct timespec ts;
+	clock_gettime(CLOCK_MONOTONIC, &ts);
+	return (uint64_t(ts.tv_sec) * 1000000ull) + (uint64_t(ts.tv_nsec) / 1000ull);
+#endif
 }
 
 uint64_t
 internalGetHifreqTimerFrequency()
 {
+#if ZEN_PLATFORM_WINDOWS
 	LARGE_INTEGER li;
 	QueryPerformanceFrequency(&li);
 
 	return li.QuadPart;
+#else
+	return 1000000ull;
+#endif
 }
 
 static uint64_t qpcFreq = internalGetHifreqTimerFrequency();
@@ -42,6 +57,15 @@ GetHifreqTimerFrequencySafe()
 	return qpcFreq;
 }
 
+//////////////////////////////////////////////////////////////////////////
+
+#if !ZEN_PLATFORM_WINDOWS
+void Sleep(uint32_t ms)
+{
+	usleep(ms * 1000U);
+}
+#endif
+
 //////////////////////////////////////////////////////////////////////////
 //
 // Testing related code follows...
-- 
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