glfw/src/x11_time.c

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//========================================================================
// GLFW - An OpenGL library
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// Platform: X11/GLX
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// API version: 3.0
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// WWW: http://www.glfw.org/
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Marcus Geelnard
// Copyright (c) 2006-2010 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 <time.h>
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//========================================================================
// Return raw time
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//========================================================================
static uint64_t getRawTime(void)
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{
#if defined(_POSIX_TIMERS) && defined(_POSIX_MONOTONIC_CLOCK)
if (_glfwLibrary.X11.timer.monotonic)
{
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return (uint64_t) ts.tv_sec * (uint64_t) 1000000000 + (uint64_t) ts.tv_nsec;
}
else
#endif
{
struct timeval tv;
gettimeofday(&tv, NULL);
return (uint64_t) tv.tv_sec * (uint64_t) 1000000 + (uint64_t) tv.tv_usec;
}
}
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//========================================================================
// Initialise timer
//========================================================================
void _glfwInitTimer(void)
{
#if defined(_POSIX_TIMERS) && defined(_POSIX_MONOTONIC_CLOCK)
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0)
{
_glfwLibrary.X11.timer.monotonic = GL_TRUE;
_glfwLibrary.X11.timer.resolution = 1e-9;
}
else
#endif
{
_glfwLibrary.X11.timer.resolution = 1e-6;
}
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_glfwLibrary.X11.timer.base = getRawTime();
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}
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//////////////////////////////////////////////////////////////////////////
////// GLFW platform API //////
//////////////////////////////////////////////////////////////////////////
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//========================================================================
// Return timer value in seconds
//========================================================================
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double _glfwPlatformGetTime(void)
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{
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return (double) (getRawTime() - _glfwLibrary.X11.timer.base) *
_glfwLibrary.X11.timer.resolution;
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}
//========================================================================
// Set timer value in seconds
//========================================================================
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void _glfwPlatformSetTime(double time)
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{
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_glfwLibrary.X11.timer.base = getRawTime() -
(uint64_t) (time / _glfwLibrary.X11.timer.resolution);
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}