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103 lines
3.6 KiB
C
103 lines
3.6 KiB
C
//========================================================================
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// GLFW - An OpenGL library
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// Platform: Win32/WGL
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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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//////////////////////////////////////////////////////////////////////////
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////// GLFW internal API //////
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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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__int64 freq;
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if (QueryPerformanceFrequency((LARGE_INTEGER*) &freq))
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{
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_glfwLibrary.Win32.timer.hasPerformanceCounter = GL_TRUE;
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_glfwLibrary.Win32.timer.resolution = 1.0 / (double) freq;
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QueryPerformanceCounter((LARGE_INTEGER*) &_glfwLibrary.Win32.timer.t0_64);
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}
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else
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{
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_glfwLibrary.Win32.timer.hasPerformanceCounter = GL_FALSE;
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_glfwLibrary.Win32.timer.resolution = 0.001; // winmm resolution is 1 ms
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_glfwLibrary.Win32.timer.t0_32 = _glfw_timeGetTime();
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}
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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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double t;
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__int64 t_64;
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if (_glfwLibrary.Win32.timer.hasPerformanceCounter)
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{
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QueryPerformanceCounter((LARGE_INTEGER*) &t_64);
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t = (double)(t_64 - _glfwLibrary.Win32.timer.t0_64);
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}
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else
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t = (double)(_glfw_timeGetTime() - _glfwLibrary.Win32.timer.t0_32);
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return t * _glfwLibrary.Win32.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 t)
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{
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__int64 t_64;
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if (_glfwLibrary.Win32.timer.hasPerformanceCounter)
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{
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QueryPerformanceCounter((LARGE_INTEGER*) &t_64);
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_glfwLibrary.Win32.timer.t0_64 = t_64 - (__int64) (t / _glfwLibrary.Win32.timer.resolution);
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}
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else
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_glfwLibrary.Win32.timer.t0_32 = _glfw_timeGetTime() - (int)(t * 1000.0);
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}
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