| /* |
| Simple DirectMedia Layer |
| Copyright (C) 1997-2024 Sam Lantinga <slouken@libsdl.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 "SDL_internal.h" |
| |
| #ifdef SDL_TIMER_WINDOWS |
| |
| #include "../../core/windows/SDL_windows.h" |
| |
| |
| #ifdef CREATE_WAITABLE_TIMER_HIGH_RESOLUTION |
| static void SDL_CleanupWaitableTimer(void *timer) |
| { |
| CloseHandle(timer); |
| } |
| |
| HANDLE SDL_GetWaitableTimer() |
| { |
| static SDL_TLSID TLS_timer_handle; |
| HANDLE timer; |
| |
| if (!TLS_timer_handle) { |
| TLS_timer_handle = SDL_CreateTLS(); |
| } |
| timer = SDL_GetTLS(TLS_timer_handle); |
| if (!timer) { |
| timer = CreateWaitableTimerExW(NULL, NULL, CREATE_WAITABLE_TIMER_HIGH_RESOLUTION, TIMER_ALL_ACCESS); |
| if (timer) { |
| SDL_SetTLS(TLS_timer_handle, timer, SDL_CleanupWaitableTimer); |
| } |
| } |
| return timer; |
| } |
| #endif /* CREATE_WAITABLE_TIMER_HIGH_RESOLUTION */ |
| |
| Uint64 SDL_GetPerformanceCounter(void) |
| { |
| LARGE_INTEGER counter; |
| const BOOL rc = QueryPerformanceCounter(&counter); |
| SDL_assert(rc != 0); /* this should _never_ fail if you're on XP or later. */ |
| return (Uint64)counter.QuadPart; |
| } |
| |
| Uint64 SDL_GetPerformanceFrequency(void) |
| { |
| LARGE_INTEGER frequency; |
| const BOOL rc = QueryPerformanceFrequency(&frequency); |
| SDL_assert(rc != 0); /* this should _never_ fail if you're on XP or later. */ |
| return (Uint64)frequency.QuadPart; |
| } |
| |
| void SDL_DelayNS(Uint64 ns) |
| { |
| /* CREATE_WAITABLE_TIMER_HIGH_RESOLUTION flag was added in Windows 10 version 1803. |
| * |
| * Sleep() is not publicly available to apps in early versions of WinRT. |
| * |
| * Visual C++ 2013 Update 4 re-introduced Sleep() for Windows 8.1 and |
| * Windows Phone 8.1. |
| * |
| * Use the compiler version to determine availability. |
| * |
| * NOTE #1: _MSC_FULL_VER == 180030723 for Visual C++ 2013 Update 3. |
| * NOTE #2: Visual C++ 2013, when compiling for Windows 8.0 and |
| * Windows Phone 8.0, uses the Visual C++ 2012 compiler to build |
| * apps and libraries. |
| */ |
| #ifdef CREATE_WAITABLE_TIMER_HIGH_RESOLUTION |
| HANDLE timer = SDL_GetWaitableTimer(); |
| if (timer) { |
| LARGE_INTEGER due_time; |
| due_time.QuadPart = -((LONGLONG)ns / 100); |
| if (SetWaitableTimerEx(timer, &due_time, 0, NULL, NULL, NULL, 0)) { |
| WaitForSingleObject(timer, INFINITE); |
| } |
| return; |
| } |
| #endif |
| |
| { |
| const Uint64 max_delay = 0xffffffffLL * SDL_NS_PER_MS; |
| if (ns > max_delay) { |
| ns = max_delay; |
| } |
| |
| #if defined(SDL_PLATFORM_WINRT) && defined(_MSC_FULL_VER) && (_MSC_FULL_VER <= 180030723) |
| static HANDLE mutex = 0; |
| if (!mutex) { |
| mutex = CreateEventEx(0, 0, 0, EVENT_ALL_ACCESS); |
| } |
| WaitForSingleObjectEx(mutex, (DWORD)SDL_NS_TO_MS(ns), FALSE); |
| #else |
| Sleep((DWORD)SDL_NS_TO_MS(ns)); |
| #endif |
| } |
| } |
| |
| #endif /* SDL_TIMER_WINDOWS */ |