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Andreas Müller d5e745d62e GLES2: Get sin/cos out of vertex shader 
The only place angle is activated and causes effect is RenderCopyEx. All other
methods which use vertex shader, leave angle disabled and cause useless sin/cos
calculation in shader.

To get around shader's interface is changed to a vector that contains results
of sin and cos. To behave properly when disabled, cos value is set with offset
-1.0 making 0.0 default when deactivated.

As nice side effect it simplifies GLES2_UpdateVertexBuffer: All attributes are
vectors now.

Additional background:

* On RaspberryPi it gives a performace win for operations. Tested with
  [1] numbers go down for 5-10% (not easy to estimate due to huge variation).
* SDL_RenderCopyEx was tested with [2]
* It works around left rotated display caused by low accuracy sin implemetation
  in RaspberryPi/VC4 [3]

[1] https://github.com/schnitzeltony/sdl2box
[2] https://github.com/schnitzeltony/sdl2rendercopyex
[3] https://github.com/anholt/mesa/issues/110

Signed-off-by: Andreas Müller <schnitzeltony@gmail.com>
2018-08-28 12:57:51 -07:00
acinclude Fixed bug 3481 - Configure fails to detect dynamic library support on powerpc64le 2016-11-06 20:26:48 -08:00
android-project Implement SDL_HapticStopEffect on Android (thanks Rachel!) 2018-08-24 10:41:57 -07:00
android-project-ant Added the old ant Android build project structure 2017-10-28 12:11:25 -07:00
build-scripts ltmain.sh: make OSX autofoo builds' compatibility version match Xcode builds. 2018-07-05 23:01:10 +03:00
cmake wayland: Keep protocol XML files in-tree. 2018-06-25 09:37:25 -07:00
debian Updated copyright for 2018 2018-01-03 10:03:25 -08:00
docs Updated required Android SDK to API 26, to match Google's new App Store requirements 2018-08-21 20:46:25 -07:00
include vulkan: SDL_Vulkan_GetInstanceExtensions should accept a NULL window. 2018-08-24 09:49:48 -04:00
src GLES2: Get sin/cos out of vertex shader 2018-08-28 12:57:51 -07:00
test vulkan: SDL_Vulkan_GetInstanceExtensions should accept a NULL window. 2018-08-24 09:49:48 -04:00
VisualC Added display event files to the Visual Studio projects 2018-08-23 02:48:47 -07:00
VisualC-WinRT Added display event files to the Visual Studio projects 2018-08-23 02:48:47 -07:00
visualtest ran 'chmod -x' on many files 2018-06-12 14:00:15 +03:00
wayland-protocols wayland: Keep protocol XML files in-tree. 2018-06-25 09:37:25 -07:00
Xcode Added display event files to the Mac OS X project 2018-08-23 02:24:31 -07:00
Xcode-iOS Added SDL_GetDisplayOrientation() to get the display orientation, and added a new event SDL_DISPLAYEVENT to notify the application when the orientation changes. 2018-08-22 21:48:28 -07:00
.hgignore First pass on the new SDL sensor API 2018-08-21 12:11:34 -07:00
.hgtags Added tag release-2.0.8 for changeset f1084c419f33 2018-03-01 09:32:53 -08:00
Android.mk Fixed crash trying to open HIDAPI controller as a haptics device on Windows 2018-08-22 17:44:28 -07:00
autogen.sh Don't use pushd/popd in autogen.sh; Ubuntu's /bin/sh doesn't support it. 2016-12-26 22:58:58 -05:00
BUGS.txt BUGS.txt: Changed mailing list link to discourse.libsdl.org. 2017-04-01 00:05:25 -04:00
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 cmake: add sensor subsystem to the build. 2018-08-23 14:32:30 -04:00
configure Fixed the DirectFB renderer not being enabled in autoconf builds 2018-08-27 11:51:05 -07:00
configure.in Fixed the DirectFB renderer not being enabled in autoconf builds 2018-08-27 11:51:05 -07:00
COPYING.txt Updated copyright for 2018 2018-01-03 10:03:25 -08:00
CREDITS.txt Added Julian Winter to the credits for the SDL 2.0 website. 2013-08-12 08:45:37 -07:00
INSTALL.txt More HTTPS doc tweaks. 2017-02-16 16:59:07 -05:00
Makefile.in First pass on the new SDL sensor API 2018-08-21 12:11:34 -07:00
Makefile.minimal Added a dummy sensor driver 2018-08-21 13:29:21 -07:00
Makefile.pandora Added a dummy sensor driver 2018-08-21 13:29:21 -07:00
Makefile.psp Added a dummy sensor driver 2018-08-21 13:29:21 -07:00
Makefile.wiz Added a dummy sensor driver 2018-08-21 13:29:21 -07:00
README-SDL.txt More HTTPS changes in the documentation. 2017-02-16 16:52:03 -05:00
README.txt readme: correct webpage URL to use HTTPS. 2017-02-16 13:30:34 -05:00
sdl2-config.cmake.in Applied Ubuntu patch bug_822210_fix_sdl2-config.cmake_whitespace.patch 2016-10-07 15:08:37 -07:00
sdl2-config.in Revert fix for bug 1392 because it breaks linking with mingw32 2013-10-21 10:28:57 -07:00
sdl2.m4 Fixed bug 3429 - Update AM_PATH_SDL2() to also check for SDL2.framework 2016-09-29 16:37:08 -07:00
sdl2.pc.in Revert fix for bug 1392 because it breaks linking with mingw32 2013-10-21 10:28:57 -07:00
SDL2.spec.in Fixed docs path in RPM .spec file. 2015-06-04 19:05:01 -04:00
SDL2Config.cmake Fixed bug 3651 - CMake build does not install CMake package configuration 2017-08-09 19:03:10 -07:00
TODO.txt Added __WINDOWS__ to reflect both 32 and 64-bit windows platforms 2013-10-20 20:41:30 -07:00
VisualC.html Fixed two typos in documentation. 2016-01-12 22:23:53 +01:00
WhatsNew.txt Added SDL_GameControllerMappingForDeviceIndex() to get the mapping for a controller before it's opened 2018-03-07 13:30:40 -08:00

README.txt 

                         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)