mirror of
https://github.com/glfw/glfw.git
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110 lines
3.4 KiB
C
110 lines
3.4 KiB
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/
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//------------------------------------------------------------------------
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// Copyright (c) 2002-2006 Marcus Geelnard
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// Copyright (c) 2006-2010 Camilla Berglund <elmindreda@elmindreda.org>
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//
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// This software is provided 'as-is', without any express or implied
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// warranty. In no event will the authors be held liable for any damages
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// arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it
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// freely, subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented; you must not
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// claim that you wrote the original software. If you use this software
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// in a product, an acknowledgment in the product documentation would
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// be appreciated but is not required.
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//
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// 2. Altered source versions must be plainly marked as such, and must not
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// be misrepresented as being the original software.
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//
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// 3. This notice may not be removed or altered from any source
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// distribution.
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//
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//========================================================================
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#include "internal.h"
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#include <time.h>
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//========================================================================
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// Return raw time
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//========================================================================
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static uint64_t getRawTime(void)
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{
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#if defined(_POSIX_TIMERS) && defined(_POSIX_MONOTONIC_CLOCK)
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if (_glfwLibrary.X11.timer.monotonic)
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{
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struct timespec ts;
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clock_gettime(CLOCK_MONOTONIC, &ts);
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return (uint64_t) ts.tv_sec * (uint64_t) 1000000000 + (uint64_t) ts.tv_nsec;
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}
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else
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#endif
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{
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return (uint64_t) tv.tv_sec * (uint64_t) 1000000 + (uint64_t) tv.tv_usec;
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}
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}
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//========================================================================
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// Initialise timer
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//========================================================================
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void _glfwInitTimer(void)
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{
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#if defined(_POSIX_TIMERS) && defined(_POSIX_MONOTONIC_CLOCK)
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struct timespec ts;
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if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0)
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{
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_glfwLibrary.X11.timer.monotonic = GL_TRUE;
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_glfwLibrary.X11.timer.resolution = 1e-9;
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}
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else
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#endif
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{
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_glfwLibrary.X11.timer.resolution = 1e-6;
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}
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_glfwLibrary.X11.timer.base = getRawTime();
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}
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//////////////////////////////////////////////////////////////////////////
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////// GLFW platform API //////
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//////////////////////////////////////////////////////////////////////////
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//========================================================================
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// Return timer value in seconds
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//========================================================================
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double _glfwPlatformGetTime(void)
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{
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return (double) (getRawTime() - _glfwLibrary.X11.timer.base) *
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_glfwLibrary.X11.timer.resolution;
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}
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//========================================================================
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// Set timer value in seconds
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//========================================================================
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void _glfwPlatformSetTime(double time)
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{
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_glfwLibrary.X11.timer.base = getRawTime() -
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(uint64_t) (time / _glfwLibrary.X11.timer.resolution);
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}
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