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Simple Directmedia Layer
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Frank Praznik a6fbf0488c Add time and realtime clock functions 
Adds functions to query the system's realtime clock, convert time intervals to/from a calendar date and time in either UTC or the local time, and perform time related calculations.

An SDL_Time type (a time interval represented in nanoseconds), and SDL_DateTime struct (broken down calendar date and time) were added to facilitate this functionality.

Querying the system time results in a value expressed in nanoseconds since the Unix epoch (Jan 1, 1970) in UTC +0000. Conversions to and from the various platform epochs and units are performed when required.

Any direct handling of timezones and DST were intentionally avoided. The offset from UTC is provided when converting from UTC to a local time by calculating the difference between the original UTC and the resulting local time, but no other timezone or DST information is used.

The preferred date formatting and 12/24 hour time for the system locale can be retrieved via global preferences.

Helper functions for obtaining the day of week or day or year for calendar date, and getting the number of days in a month in a given year are provided for convenience. These are simple, but useful for performing various time related calculations.

An automated test for time conversion is included, as is a simple standalone test to display the current system date and time onscreen along with a calendar, the rendering of which demonstrates the use of the utility functions (press up/down to increment or decrement the current month, and keys 1-5 to change the date and time formats).
2024-03-19 10:57:36 -07:00
.github Fix SDL_LEAN_AND_MEAN build 2024-03-11 13:46:16 -07:00
android-project Add flag to registerReceiver on Android 2024-03-10 09:01:07 -07:00
build-scripts Fixed duplicate SDL_Version change 2024-03-18 13:59:03 -07:00
cmake cmake: add -Wimplicit-fallthrough warning 2024-03-18 20:34:50 +01:00
docs Renamed SDL_SizeIO() SDL_GetIOSize() 2024-03-18 00:27:18 -04:00
include Add time and realtime clock functions 2024-03-19 10:57:36 -07:00
mingw/pkg-support/cmake build: don't add SDL3 subfolder to include path for external projects 2022-11-27 14:33:13 -08:00
src Add time and realtime clock functions 2024-03-19 10:57:36 -07:00
test Add time and realtime clock functions 2024-03-19 10:57:36 -07:00
VisualC Add time and realtime clock functions 2024-03-19 10:57:36 -07:00
VisualC-GDK Add time and realtime clock functions 2024-03-19 10:57:36 -07:00
VisualC-WinRT Add time and realtime clock functions 2024-03-19 10:57:36 -07:00
wayland-protocols wayland: Add the xdg-foreign-unstable-v2 protocol 2024-03-15 18:30:05 -04:00
Xcode Add time and realtime clock functions 2024-03-19 10:57:36 -07:00
.clang-format Add 'wl_list_for_each_safe' to the clang-format macro list 2024-03-14 10:22:23 -04:00
.clang-tidy Fix size of memcpy in SDL_AudioDeviceFormatChangedAlreadyLocked 2023-08-05 14:14:45 -04:00
.editorconfig Fixed formatting for Haiku cc files 2023-01-25 03:03:41 -08:00
.gitignore GDK: Remove old shader sources, unify shader compilation .bats 2024-03-02 10:30:29 -08:00
.wikiheaders-options sdlwiki: SDL3 advises users to include through 'SDL3/SDL.h' 2023-03-21 02:19:19 +01:00
Android.mk Add time and realtime clock functions 2024-03-19 10:57:36 -07:00
BUGS.txt Cleaned up a few more Bugzilla mentions. 2021-02-12 14:46:49 -05:00
CMakeLists.txt Add time and realtime clock functions 2024-03-19 10:57:36 -07:00
CREDITS.md docs: Moved CREDITS and INSTALL to markdown format. 2023-11-29 12:31:27 -05:00
INSTALL.md docs: Moved CREDITS and INSTALL to markdown format. 2023-11-29 12:31:27 -05:00
LICENSE.txt Updated copyright for 2024 2024-01-01 13:15:26 -08:00
README-SDL.txt More HTTPS changes in the documentation. 2017-02-16 16:52:03 -05:00
README.md docs: Convert everything to Unix-style endlines. 2023-11-29 11:29:57 -05:00
WhatsNew.txt Added the environment variable SDL_LOGGING to control default log output 2024-01-27 19:30:22 -08:00

README.md

Simple DirectMedia Layer (SDL) Version 3.0

https://www.libsdl.org/

Simple DirectMedia Layer is a cross-platform development library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware via OpenGL and Direct3D. It is used by video playback software, emulators, and popular games including Valve's award winning catalog and many Humble Bundle games.

More extensive documentation is available in the docs directory, starting with README.md. If you are migrating to SDL 3.0 from SDL 2.0, the changes are extensively documented in README-migration.md.

Enjoy!

Sam Lantinga (slouken@libsdl.org)