shithub: cstory

ref: a3a8c4df947269cf71cc2b7fd2e471ce44fe535b
dir: /external/glfw/src/cocoa_time.c/

//========================================================================
// GLFW 3.3 macOS - www.glfw.org
//------------------------------------------------------------------------
// Copyright (c) 2009-2016 Camilla Löwy <elmindreda@glfw.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.
//
//========================================================================
// It is fine to use C99 in this file because it will not be built with VS
//========================================================================

#include "internal.h"

#include <mach/mach_time.h>


//////////////////////////////////////////////////////////////////////////
//////                       GLFW internal API                      //////
//////////////////////////////////////////////////////////////////////////

// Initialise timer
//
void _glfwInitTimerNS(void)
{
    mach_timebase_info_data_t info;
    mach_timebase_info(&info);

    _glfw.timer.ns.frequency = (info.denom * 1e9) / info.numer;
}


//////////////////////////////////////////////////////////////////////////
//////                       GLFW platform API                      //////
//////////////////////////////////////////////////////////////////////////

uint64_t _glfwPlatformGetTimerValue(void)
{
    return mach_absolute_time();
}

uint64_t _glfwPlatformGetTimerFrequency(void)
{
    return _glfw.timer.ns.frequency;
}