149 lines
4.5 KiB
C
149 lines
4.5 KiB
C
//========================================================================
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// GLFW - An OpenGL framework
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// File: win32_time.c
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// Platform: Windows
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// API version: 2.6
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// WWW: http://glfw.sourceforge.net
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//------------------------------------------------------------------------
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// Copyright (c) 2002-2006 Camilla Berglund
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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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// $Id: win32_time.c,v 1.13 2007/03/15 03:20:21 elmindreda Exp $
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//========================================================================
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#include "internal.h"
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//************************************************************************
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//**** GLFW internal functions ****
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//************************************************************************
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//========================================================================
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// _glfwInitTimer() - 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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// Check if we have a performance counter
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if( QueryPerformanceFrequency( (LARGE_INTEGER *)&freq ) )
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{
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// Performance counter is available => use it!
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_glfwLibrary.Timer.HasPerformanceCounter = GL_TRUE;
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// Counter resolution is 1 / counter frequency
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_glfwLibrary.Timer.Resolution = 1.0 / (double)freq;
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// Set start time for timer
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QueryPerformanceCounter( (LARGE_INTEGER *)&_glfwLibrary.Timer.t0_64 );
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}
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else
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{
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// No performace counter available => use the tick counter
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_glfwLibrary.Timer.HasPerformanceCounter = GL_FALSE;
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// Counter resolution is 1 ms
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_glfwLibrary.Timer.Resolution = 0.001;
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// Set start time for timer
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_glfwLibrary.Timer.t0_32 = _glfw_timeGetTime();
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}
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}
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//************************************************************************
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//**** Platform implementation functions ****
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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.Timer.HasPerformanceCounter )
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{
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QueryPerformanceCounter( (LARGE_INTEGER *)&t_64 );
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t = (double)(t_64 - _glfwLibrary.Timer.t0_64);
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}
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else
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{
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t = (double)(_glfw_timeGetTime() - _glfwLibrary.Timer.t0_32);
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}
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// Calculate the current time in seconds
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return t * _glfwLibrary.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.Timer.HasPerformanceCounter )
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{
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QueryPerformanceCounter( (LARGE_INTEGER *)&t_64 );
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_glfwLibrary.Timer.t0_64 = t_64 - (__int64)(t/_glfwLibrary.Timer.Resolution);
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}
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else
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{
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_glfwLibrary.Timer.t0_32 = _glfw_timeGetTime() - (int)(t*1000.0);
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}
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}
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//========================================================================
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// Put a thread to sleep for a specified amount of time
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//========================================================================
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void _glfwPlatformSleep( double time )
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{
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DWORD t;
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if( time == 0.0 )
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{
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t = 0;
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}
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else if( time < 0.001 )
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{
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t = 1;
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}
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else if( time > 2147483647.0 )
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{
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t = 2147483647;
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}
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else
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{
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t = (DWORD)(time*1000.0 + 0.5);
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}
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Sleep( t );
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}
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