147 lines
4.4 KiB
C
147 lines
4.4 KiB
C
//========================================================================
|
|
// GLFW - An OpenGL framework
|
|
// Platform: Win32/WGL
|
|
// API version: 2.7
|
|
// 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"
|
|
|
|
|
|
//************************************************************************
|
|
//**** GLFW internal functions ****
|
|
//************************************************************************
|
|
|
|
//========================================================================
|
|
// Initialise timer
|
|
//========================================================================
|
|
|
|
void _glfwInitTimer( void )
|
|
{
|
|
__int64 freq;
|
|
|
|
// Check if we have a performance counter
|
|
if( QueryPerformanceFrequency( (LARGE_INTEGER *)&freq ) )
|
|
{
|
|
// Performance counter is available => use it!
|
|
_glfwLibrary.Timer.HasPerformanceCounter = GL_TRUE;
|
|
|
|
// Counter resolution is 1 / counter frequency
|
|
_glfwLibrary.Timer.Resolution = 1.0 / (double)freq;
|
|
|
|
// Set start time for timer
|
|
QueryPerformanceCounter( (LARGE_INTEGER *)&_glfwLibrary.Timer.t0_64 );
|
|
}
|
|
else
|
|
{
|
|
// No performace counter available => use the tick counter
|
|
_glfwLibrary.Timer.HasPerformanceCounter = GL_FALSE;
|
|
|
|
// Counter resolution is 1 ms
|
|
_glfwLibrary.Timer.Resolution = 0.001;
|
|
|
|
// Set start time for timer
|
|
_glfwLibrary.Timer.t0_32 = _glfw_timeGetTime();
|
|
}
|
|
}
|
|
|
|
|
|
//************************************************************************
|
|
//**** Platform implementation functions ****
|
|
//************************************************************************
|
|
|
|
//========================================================================
|
|
// Return timer value in seconds
|
|
//========================================================================
|
|
|
|
double _glfwPlatformGetTime( void )
|
|
{
|
|
double t;
|
|
__int64 t_64;
|
|
|
|
if( _glfwLibrary.Timer.HasPerformanceCounter )
|
|
{
|
|
QueryPerformanceCounter( (LARGE_INTEGER *)&t_64 );
|
|
t = (double)(t_64 - _glfwLibrary.Timer.t0_64);
|
|
}
|
|
else
|
|
{
|
|
t = (double)(_glfw_timeGetTime() - _glfwLibrary.Timer.t0_32);
|
|
}
|
|
|
|
// Calculate the current time in seconds
|
|
return t * _glfwLibrary.Timer.Resolution;
|
|
}
|
|
|
|
|
|
//========================================================================
|
|
// Set timer value in seconds
|
|
//========================================================================
|
|
|
|
void _glfwPlatformSetTime( double t )
|
|
{
|
|
__int64 t_64;
|
|
|
|
if( _glfwLibrary.Timer.HasPerformanceCounter )
|
|
{
|
|
QueryPerformanceCounter( (LARGE_INTEGER *)&t_64 );
|
|
_glfwLibrary.Timer.t0_64 = t_64 - (__int64)(t/_glfwLibrary.Timer.Resolution);
|
|
}
|
|
else
|
|
{
|
|
_glfwLibrary.Timer.t0_32 = _glfw_timeGetTime() - (int)(t*1000.0);
|
|
}
|
|
}
|
|
|
|
|
|
//========================================================================
|
|
// Put a thread to sleep for a specified amount of time
|
|
//========================================================================
|
|
|
|
void _glfwPlatformSleep( double time )
|
|
{
|
|
DWORD t;
|
|
|
|
if( time == 0.0 )
|
|
{
|
|
t = 0;
|
|
}
|
|
else if( time < 0.001 )
|
|
{
|
|
t = 1;
|
|
}
|
|
else if( time > 2147483647.0 )
|
|
{
|
|
t = 2147483647;
|
|
}
|
|
else
|
|
{
|
|
t = (DWORD)(time*1000.0 + 0.5);
|
|
}
|
|
Sleep( t );
|
|
}
|
|
|