glfw/lib/x11/x11_time.c
2010-09-08 15:51:25 +02:00

90 lines
2.9 KiB
C

//========================================================================
// GLFW - An OpenGL framework
// Platform: X11/GLX
// API version: 3.0
// 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"
//========================================================================
// Initialise timer
//========================================================================
void _glfwInitTimer(void)
{
struct timeval tv;
// "Resolution" is 1 us
_glfwLibrary.Timer.resolution = 1e-6;
// Set start-time for timer
gettimeofday(&tv, NULL);
_glfwLibrary.Timer.t0 = (long long) tv.tv_sec * (long long) 1000000 +
(long long) tv.tv_usec;
}
//************************************************************************
//**** Platform implementation functions ****
//************************************************************************
//========================================================================
// Return timer value in seconds
//========================================================================
double _glfwPlatformGetTime(void)
{
long long t;
struct timeval tv;
gettimeofday(&tv, NULL);
t = (long long) tv.tv_sec * (long long) 1000000 +
(long long) tv.tv_usec;
return (double)(t - _glfwLibrary.Timer.t0) * _glfwLibrary.Timer.resolution;
}
//========================================================================
// Set timer value in seconds
//========================================================================
void _glfwPlatformSetTime(double t)
{
long long t0;
struct timeval tv;
gettimeofday(&tv, NULL);
t0 = (long long) tv.tv_sec * (long long) 1000000 +
(long long) tv.tv_usec;
// Calulate new starting time
_glfwLibrary.Timer.t0 = t0 - (long long)(t / _glfwLibrary.Timer.resolution);
}