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https://github.com/glfw/glfw.git
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87 lines
2.7 KiB
C
87 lines
2.7 KiB
C
//========================================================================
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// GLFW 3.2 Win32 - 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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// Return raw time
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//
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static unsigned __int64 getRawTime(void)
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{
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if (_glfw.win32_time.hasPC)
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{
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unsigned __int64 time;
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QueryPerformanceCounter((LARGE_INTEGER*) &time);
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return time;
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}
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else
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return (unsigned __int64) _glfw_timeGetTime();
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}
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//////////////////////////////////////////////////////////////////////////
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////// GLFW internal API //////
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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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unsigned __int64 frequency;
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if (QueryPerformanceFrequency((LARGE_INTEGER*) &frequency))
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{
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_glfw.win32_time.hasPC = GLFW_TRUE;
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_glfw.win32_time.resolution = 1.0 / (double) frequency;
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}
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else
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{
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_glfw.win32_time.hasPC = GLFW_FALSE;
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_glfw.win32_time.resolution = 0.001; // winmm resolution is 1 ms
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}
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_glfw.win32_time.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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double _glfwPlatformGetTime(void)
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{
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return (double) (getRawTime() - _glfw.win32_time.base) *
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_glfw.win32_time.resolution;
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}
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void _glfwPlatformSetTime(double time)
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{
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_glfw.win32_time.base = getRawTime() -
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(unsigned __int64) (time / _glfw.win32_time.resolution);
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}
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