116 lines
3.6 KiB
C
116 lines
3.6 KiB
C
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/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
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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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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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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 be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_internal.h"
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#ifdef SDL_TIMER_WINDOWS
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#include "../../core/windows/SDL_windows.h"
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#ifdef CREATE_WAITABLE_TIMER_HIGH_RESOLUTION
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static void SDL_CleanupWaitableTimer(void *timer)
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{
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CloseHandle(timer);
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}
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HANDLE SDL_GetWaitableTimer()
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{
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static SDL_TLSID TLS_timer_handle;
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HANDLE timer;
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if (!TLS_timer_handle) {
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TLS_timer_handle = SDL_CreateTLS();
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}
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timer = SDL_GetTLS(TLS_timer_handle);
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if (!timer) {
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timer = CreateWaitableTimerExW(NULL, NULL, CREATE_WAITABLE_TIMER_HIGH_RESOLUTION, TIMER_ALL_ACCESS);
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if (timer) {
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SDL_SetTLS(TLS_timer_handle, timer, SDL_CleanupWaitableTimer);
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}
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}
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return timer;
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}
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#endif /* CREATE_WAITABLE_TIMER_HIGH_RESOLUTION */
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Uint64 SDL_GetPerformanceCounter(void)
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{
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LARGE_INTEGER counter;
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const BOOL rc = QueryPerformanceCounter(&counter);
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SDL_assert(rc != 0); /* this should _never_ fail if you're on XP or later. */
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return (Uint64)counter.QuadPart;
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}
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Uint64 SDL_GetPerformanceFrequency(void)
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{
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LARGE_INTEGER frequency;
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const BOOL rc = QueryPerformanceFrequency(&frequency);
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SDL_assert(rc != 0); /* this should _never_ fail if you're on XP or later. */
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return (Uint64)frequency.QuadPart;
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}
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void SDL_DelayNS(Uint64 ns)
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{
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/* CREATE_WAITABLE_TIMER_HIGH_RESOLUTION flag was added in Windows 10 version 1803.
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*
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* Sleep() is not publicly available to apps in early versions of WinRT.
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*
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* Visual C++ 2013 Update 4 re-introduced Sleep() for Windows 8.1 and
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* Windows Phone 8.1.
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*
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* Use the compiler version to determine availability.
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*
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* NOTE #1: _MSC_FULL_VER == 180030723 for Visual C++ 2013 Update 3.
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* NOTE #2: Visual C++ 2013, when compiling for Windows 8.0 and
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* Windows Phone 8.0, uses the Visual C++ 2012 compiler to build
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* apps and libraries.
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*/
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#ifdef CREATE_WAITABLE_TIMER_HIGH_RESOLUTION
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HANDLE timer = SDL_GetWaitableTimer();
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if (timer) {
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LARGE_INTEGER due_time;
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due_time.QuadPart = -((LONGLONG)ns / 100);
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if (SetWaitableTimerEx(timer, &due_time, 0, NULL, NULL, NULL, 0)) {
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WaitForSingleObject(timer, INFINITE);
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}
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return;
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}
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#endif
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{
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const Uint64 max_delay = 0xffffffffLL * SDL_NS_PER_MS;
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if (ns > max_delay) {
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ns = max_delay;
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}
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#if defined(__WINRT__) && defined(_MSC_FULL_VER) && (_MSC_FULL_VER <= 180030723)
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static HANDLE mutex = 0;
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if (!mutex) {
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mutex = CreateEventEx(0, 0, 0, EVENT_ALL_ACCESS);
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}
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WaitForSingleObjectEx(mutex, (DWORD)SDL_NS_TO_MS(ns), FALSE);
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#else
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Sleep((DWORD)SDL_NS_TO_MS(ns));
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#endif
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}
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}
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#endif /* SDL_TIMER_WINDOWS */
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