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Simple Directmedia Layer
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Ryan C. Gordon 111c3add73 audio: Resampler optimizations. 
- Calculate `j * RESAMPLER_SAMPLES_PER_ZERO_CROSSING` once per loop
  iteration since we use it multiple times.
- Do the left-wing loop in two sections: while `srcframe < 0` and then
  the remaining calculations when `srcframe >= 0`. This bubbles a conditional
  out of every iteration of a tight loop, giving us a boost. We could
  _probably_ do this to the right-wing loop too, but it's less straightforward
  there.
- The real win: Use floats instead of doubles. This almost doubles the speed
  of the entire function on Intel CPUs, and for embedded things without
  hardware-level support for doubles, the speedup is enormous. This in
  theory might reduce audio quality, though, and I had to put a check in
  place to avoid a division-by-zero that we avoided at higher precision, but
  this is likely to be worth keeping for at least the Sony PSP and other
  smaller platforms, if not everyone.
2022-04-26 13:32:42 -04:00
.github CI: update os2.yml to use open-watcom/setup-watcom 2022-04-14 10:10:02 +03:00
acinclude imported two libtool mainstream commits 28fbcb6a and b55b1cc8 2022-03-16 17:15:20 +03:00
android-project Adjust gradle dependencies to enable the build to position assets for the APK 2022-03-15 21:57:25 -07:00
android-project-ant Added the old ant Android build project structure 2017-10-28 12:11:25 -07:00
build-scripts audio: Prebake the resampler's kaiser table instead of doing it at runtime. 2022-04-26 13:32:42 -04:00
cmake wayland: The rest of the wayland-client 1.18 requirement... Git, please 2022-03-23 13:27:01 -04:00
docs Vita: fix readme 2022-03-31 06:02:50 -07:00
include add SDL_bsearch 2022-04-26 04:03:25 +03:00
src audio: Resampler optimizations. 2022-04-26 13:32:42 -04:00
test test: Basic tests for SDL_FRectEquals 2022-04-20 08:38:53 -07:00
VisualC Move SDL_List functions to SDL_list.c to avoid more merge with eventual PR 2022-04-01 07:59:16 +02:00
VisualC-WinRT UWP: Require Windows 10 16299 or newer. 2022-04-11 12:09:40 -04:00
visualtest remove all unnecessary stuff from visualtest configury. 2021-12-21 20:01:02 +03:00
wayland-protocols video: wayland: Use wp-viewporter for fullscreen with non-native resolutions 2022-03-28 13:18:26 -04:00
Xcode Updated to version 2.0.23 for development 2022-04-25 13:45:51 -07:00
Xcode-iOS Updated iOS build instructions 2021-11-30 12:19:26 -08:00
.gitignore testsurround: Add surround sound channel tester 2021-10-30 21:26:03 -07:00
Android.mk mark Android.mk as non-executable 2021-11-12 12:55:28 +03:00
autogen.sh bump minimum required autoconf version and revise autogen.sh 2021-04-14 23:20:40 +03:00
BUGS.txt Cleaned up a few more Bugzilla mentions. 2021-02-12 14:46:49 -05:00
cmake_uninstall.cmake.in Fixed bug 3867 - Can't find install_manifest.txt when running 'uninstall' target 2017-10-12 08:44:45 -07:00
CMakeLists.txt add SDL_bsearch 2022-04-26 04:03:25 +03:00
configure add SDL_bsearch 2022-04-26 04:03:25 +03:00
configure.ac add SDL_bsearch 2022-04-26 04:03:25 +03:00
CREDITS.txt Fixed crash if initialization of EGL failed but was tried again later. 2015-06-21 17:33:46 +02:00
INSTALL.txt INSTALL.txt: Say "macOS" instead of "Mac OS X" in modern times. 2022-03-15 13:07:55 -04:00
LICENSE.txt Updated copyright for 2022 2022-01-03 09:40:21 -08:00
Makefile.in Makefile.in: added missing CXX variable. 2022-04-06 20:56:10 +03:00
Makefile.minimal build libSDL2_test too with Makefile.minimal 2021-11-14 01:10:32 +03:00
Makefile.os2 Updated to version 2.0.23 for development 2022-04-25 13:45:51 -07:00
Makefile.pandora more fixes to standalone makefiles. 2021-11-13 21:56:20 +03:00
README-SDL.txt More HTTPS changes in the documentation. 2017-02-16 16:52:03 -05:00
README.md Update and rename README.txt to README.md 2021-03-20 18:46:37 -04:00
sdl2-config-version.cmake.in cmake: Forgot to add this file to revision control. 2020-02-25 14:52:03 -05:00
sdl2-config.cmake.in sdl2-config.cmake.in: Make SDL2::SDL2 work with MinGW, fixes #3665 2021-07-08 14:55:33 -07:00
sdl2-config.in build: Don't duplicate Libs in Libs.private in pkg-config file 2020-04-12 13:24:36 +01:00
sdl2.m4 acinclude & sdl2.m4 updates: 2020-12-22 17:00:28 +03:00
sdl2.pc.in rename PKG_CONFIG_LIBS_PRIV to PKGCONFIG_LIBS_PRIV 2021-04-14 21:40:50 +03:00
SDL2.spec.in license: Fixed references to COPYING.txt that are now LICENSE.txt. 2021-02-18 11:07:26 -05:00
SDL2Config.cmake cmake: Split SDL2-static and SDL2main into their own target exports 2022-01-08 09:50:14 -08:00
TODO.txt Fixed up legacy MoinMoin URLs at wiki.libsdl.org 2021-04-01 12:20:33 -04:00
WhatsNew.txt WhatsNew: Start block for 2.0.24 2022-04-26 09:21:40 -07:00

README.md

Simple DirectMedia Layer (SDL) Version 2.0

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

Enjoy!

Sam Lantinga (slouken@libsdl.org)