New functions get and set the YUV colorspace conversion mode:
SDL_SetYUVConversionMode()
SDL_GetYUVConversionMode()
SDL_GetYUVConversionModeForResolution()
SDL_ConvertPixels() converts between all supported RGB and YUV formats, with SSE acceleration for converting from planar YUV formats (YV12, NV12, etc) to common RGB/RGBA formats.
Added a new test program, testyuv, to verify correctness and speed of YUV conversion functionality.
Sylvain
Since https://hg.libsdl.org/SDL/rev/a8c29f5b679f
SDL_android_main.c is empty and then produce a warning
nativeInit does not exist and dont need to be mark undefined
Mark Callow
README-android says to copy or link the SDL source tree to the jni folder in your Android project. It is not desirable to have to compile SDL with every application; furthermore the Android NDK has support for prebuilt libraries.
Attached is script (to be put in build-scripts) that builds the Android version of the libraries. The script builds both the existing SDL2 module and a new SDL2_main module. This is a static library containing the code from src/main/android/SDL_android_main.c. Also attached is a patch for Android.mk adding this module.
Note that when building an application's native .so using this prebuilt libSDL2main, you must use a link option, such as --whole-archive, that forces inclusion of the code in the .so because the functions in SDL_android_main are called only from Java.
Stefan Pöschel
if the variable NDK_MODULE_PATH is set to a relative path (like "../"),
compiling of a static SDL lib fails with an error similar to this:
make: *** No rule to make target
`..//android_libs/SDL/..//android_libs/SDL/src/main/android/SDL_android_main.c',
needed by
`obj/local/armeabi/objs/SDL2_static/__//android_libs/SDL/src/main/android/SDL_android_main.o'.
Stop.
Regarding the shared lib, this is already prevented by a "subst" command
in the /Android.mk, which removes all occurences of "$(LOCAL_PATH)/".
The attached patch does the same with the additional
"SDL_android_main.c", which is included for build the static SDL lib.
Denis Bernard
This patch to Android.mk adds support for static linking of libSDL for Android applications. A patched readme with static build instructions is also provided.
It does not break existing build environments setup according to the README-android.txt since the static library version will not be built in not required.
The static build uses the Android NDK module system (see docs/IMPORT-MODULE.html in the NDK folder and step 5 in the instructions below).
Instructions:
1. Copy the android-project directory wherever you want to keep your projects
and rename it to the name of your project.
2. Create a symlink to SDL/src/main/android/SDL_android_main.c as
<project>/jni/src/SDL_android_main.c
3. Rename <project>/jni/src/Android_static.mk to <project>/jni/src/Android.mk
(overwrite the existing one)
4. Edit <project>/jni/src/Android.mk to include your source files
5. create and export an environment variable named NDK_MODULE_PATH that points
to the parent directory of this SDL directory. e.g.:
export NDK_MODULE_PATH="$PWD"/..
6. Edit <project>/src/org/libsdl/app/SDLActivity.java and remove the call to
System.loadLibrary("SDL2") line 42.
7. Run 'ndk-build' (a script provided by the NDK). This compiles the C source
Although this requires an environment variable to be setup, it can be added once and for all to the main Android.mk of the project.
C++ is a bit of a minefield on Android. Much functionality still doesn't work, and Android can't decide on which C++ standard library to use, so it provides 3 different ones, all of which are incompatible with each other. (It looks like clang is coming too which will add a new compiler and a 4th standard library.)
As middleware, SDL might be distributed as a binary and intermixed with other projects already using C++. If C++ is intermixed in a bad way, bad things will happen. Removing dependencies on C++ will avoid this problem and downstream users won't have to worry/care.
Isaac Burns
I wanted to suggest a few changes I've found that help the Android build. By adding LOCAL_EXPORT_C_INCLUDES to the Android.mk file, anything that references the SDL Android project will inherit the include paths.
Philipp Wiesemann 2012-09-22 05:26:11 PDT
currently SDL (HG) does not implement the power management functionality of
SDL_GetPowerInfo() for Android.
I attached a patch which tries to implement this functionality (JNI only, API
5). It supports plugged state and battery percent return values but not
remaining seconds (which are not available on Android).
I'm playing with SDL on android, and did notice a problem in latest sources ( branch "default" ) :
SDL/src/render/opengles/SDL_glesfuncs.h:10: error: 'glDrawTexiOES' undeclared (first use in this function)
SDL/src/render/opengles/SDL_glesfuncs.h:10: error: (Each undeclared identifier is reported only once
If it can help you win some time here is the fix, applied to the "Android.mk" file :
LOCAL_CFLAGS += -D GL_GLEXT_PROTOTYPES
