win32_time.cc (2423B)
1 //======================================================================== 2 // GLFW 3.3 Win32 - www.glfw.org 3 //------------------------------------------------------------------------ 4 // Copyright (c) 2002-2006 Marcus Geelnard 5 // Copyright (c) 2006-2016 Camilla Löwy <elmindreda@glfw.org> 6 // 7 // This software is provided 'as-is', without any express or implied 8 // warranty. In no event will the authors be held liable for any damages 9 // arising from the use of this software. 10 // 11 // Permission is granted to anyone to use this software for any purpose, 12 // including commercial applications, and to alter it and redistribute it 13 // freely, subject to the following restrictions: 14 // 15 // 1. The origin of this software must not be misrepresented; you must not 16 // claim that you wrote the original software. If you use this software 17 // in a product, an acknowledgment in the product documentation would 18 // be appreciated but is not required. 19 // 20 // 2. Altered source versions must be plainly marked as such, and must not 21 // be misrepresented as being the original software. 22 // 23 // 3. This notice may not be removed or altered from any source 24 // distribution. 25 // 26 //======================================================================== 27 28 #include "internal.h" 29 30 31 ////////////////////////////////////////////////////////////////////////// 32 ////// GLFW internal API ////// 33 ////////////////////////////////////////////////////////////////////////// 34 35 // Initialise timer 36 // 37 void _glfwInitTimerWin32(void) 38 { 39 uint64_t frequency; 40 41 if (QueryPerformanceFrequency((LARGE_INTEGER*) &frequency)) 42 { 43 _glfw.timer.win32.hasPC = GLFW_TRUE; 44 _glfw.timer.win32.frequency = frequency; 45 } 46 else 47 { 48 _glfw.timer.win32.hasPC = GLFW_FALSE; 49 _glfw.timer.win32.frequency = 1000; 50 } 51 } 52 53 54 ////////////////////////////////////////////////////////////////////////// 55 ////// GLFW platform API ////// 56 ////////////////////////////////////////////////////////////////////////// 57 58 uint64_t _glfwPlatformGetTimerValue(void) 59 { 60 if (_glfw.timer.win32.hasPC) 61 { 62 uint64_t value; 63 QueryPerformanceCounter((LARGE_INTEGER*) &value); 64 return value; 65 } 66 else 67 return (uint64_t) timeGetTime(); 68 } 69 70 uint64_t _glfwPlatformGetTimerFrequency(void) 71 { 72 return _glfw.timer.win32.frequency; 73 } 74