glfw/src/cocoa_time.c

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//========================================================================
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// GLFW 3.2 OS X - www.glfw.org
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//------------------------------------------------------------------------
// Copyright (c) 2009-2010 Camilla Berglund <elmindreda@elmindreda.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 "internal.h"
#include <mach/mach_time.h>
// Return raw time
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//
static uint64_t getRawTime(void)
{
return mach_absolute_time();
}
//////////////////////////////////////////////////////////////////////////
////// GLFW internal API //////
//////////////////////////////////////////////////////////////////////////
// Initialise timer
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//
void _glfwInitTimerNS(void)
{
mach_timebase_info_data_t info;
mach_timebase_info(&info);
_glfw.ns_time.resolution = (double) info.numer / (info.denom * 1.0e9);
_glfw.ns_time.base = getRawTime();
}
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//////////////////////////////////////////////////////////////////////////
////// GLFW platform API //////
//////////////////////////////////////////////////////////////////////////
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double _glfwPlatformGetTime(void)
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{
return (double) (getRawTime() - _glfw.ns_time.base) *
_glfw.ns_time.resolution;
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}
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void _glfwPlatformSetTime(double time)
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{
_glfw.ns_time.base = getRawTime() -
(uint64_t) (time / _glfw.ns_time.resolution);
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}