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118 lines
3.9 KiB
118 lines
3.9 KiB
//======================================================================== |
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// GLFW - An OpenGL framework |
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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 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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