Android,ndk, SDL2 problems with screen

Giorgos_Sarris · September 23, 2012, 9:40am

Hi
I am a developer and I am trying to port an sdl game from ipad to android.
I am stuck on a weird thing that you may know how to go around.

I use windows 7, 64bit. Eclipse 3.7.2.
Latest android SDK and NDK r8b.
I use the android example by latest SDL HG.
I do this on Android 2.2.

The example works ok but:

The problem is that ‘SDL_CreateWindow’ always gives a 16bit color context
and I need 32bit.
Its pixel format RGB_565 which is the default I heard.
I need pixel format RGBA_8888 but it doesnt switch.

I tried in c++:
SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
with no change.

I tried in SDLActivity.java in ‘onCreate’ before 'setContentView’
getWindow().setFormat(PixelFormat.RGBA_8888);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DITHER);
no change at all.

It keeps choosing: ‘PixelFormat.RGB_565’ in ‘surfaceChanged’.

Can you help me?
Can that change to RGBA_8888?
Or is RGB_565 hard-coded somewhere inside the SDL code?

Thanks a lot,
George

Giorgos_Sarris · September 24, 2012, 8:20am

Hi
I am a developer and I am trying to port an sdl game from ipad to android.
I am stuck on a weird thing that you may know how to go around.

I use windows 7, 64bit. Eclipse 3.7.2.
Latest android SDK and NDK r8b.
I use the android example by latest SDL HG.
I do this on Android 2.2.

The example works ok but:

The problem is that ‘SDL_CreateWindow’ always gives a 16bit color context
and I need 32bit.
Its pixel format RGB_565 which is the default I heard.
I need pixel format RGBA_8888 but it doesnt switch.

I tried in c++:
SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
with no change.

I tried in SDLActivity.java in ‘onCreate’ before 'setContentView’
getWindow().setFormat(PixelFormat.RGBA_8888);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DITHER);
no change at all.

It keeps choosing: ‘PixelFormat.RGB_565’ in ‘surfaceChanged’.

Can you help me?
Can that change to RGBA_8888?
Or is RGB_565 hard-coded somewhere inside the SDL code?

Thanks a lot,
George

Giorgos_Sarris · September 26, 2012, 5:16am

Hi there,

I use the latest build of SDL HG and SDL2_mixer.
I made a library ‘libSDL2_mixer.so’ and a ‘libtremor.a’ with the SDL
example in android.
I target 2.2 android.
I read the ogg vorbis file from the SD card.

When I play an OGG vorbis music file on my Nexus One phone (running 2.3
android) it works ok.

When I play the same file on my Samsung Galaxy II tablet (running ICS
4.0.3 android) it plays fine but when I exit the app (with java’s
’finish()’) and relead the game I hear the music distorted like echoing.
This does not happen all the time. Half times it does and half not.

Where is the problem? How can I fix it?

Both devices open up this:
09-25 12:05:36.862: V/SDL(1441): SDL audio: opening device
09-25 12:05:36.862: V/SDL(1441): SDL audio: wanted stereo 16-bit 44.1kHz,
1024 frames buffer
09-25 12:05:36.870: V/SDL(1441): SDL audio: got stereo 16-bit 44.1kHz,
4096 frames buffer

Thanks,
Giorgos

Giorgos_Sarris · September 28, 2012, 12:01pm

Hi again,
Can anyone help me out with this SDL_mixer issue in android?

I use the latest build of SDL HG and SDL2_mixer.
I made a library ‘libSDL2_mixer.so’ and a ‘libtremor.a’ with the SDL
example in android.
I target 2.2 android.
I read the ogg vorbis file from the SD card.

When I play an OGG vorbis music file on my Nexus One phone (running 2.3
android) it works ok.

When I play the same file on my Samsung Galaxy II tablet (running ICS
4.0.3 android) it plays fine but when I exit the app (with java’s
’finish()’) and relead the game I hear the music distorted like echoing
(Its like a helicopter sound!!). This does not happen all the time. Half
times it does and half not.

Where is the problem?
Do you have any clue?

Both devices open up this:
09-25 12:05:36.862: V/SDL(1441): SDL audio: opening device
09-25 12:05:36.862: V/SDL(1441): SDL audio: wanted stereo 16-bit 44.1kHz,
1024 frames buffer
09-25 12:05:36.870: V/SDL(1441): SDL audio: got stereo 16-bit 44.1kHz,
4096 frames buffer

Thanks,
Giorgos

slouken · September 29, 2012, 8:22am

It looks like the OpenGL context is created in initEGL in the Java activity
and doesn’t respect the parameters set in the SDL API.

I would expect to see something like this there:

int attribs[] = {
EGL10.EGL_RED_SIZE, mRedSize,
EGL10.EGL_GREEN_SIZE, mGreenSize,
EGL10.EGL_BLUE_SIZE, mBlueSize,
EGL10.EGL_ALPHA_SIZE, mAlphaSize,
EGL10.EGL_DEPTH_SIZE, mDepthSize,
EGL10.EGL_SAMPLE_BUFFERS, mSampleBuffers,
EGL10.EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,
EGL10.EGL_NONE
};

Feel free to take a crack at it if you want!On Sun, Sep 23, 2012 at 2:40 AM, Giorgos Sarris wrote:

Hi

I am a developer and I am trying to port an sdl game from ipad to android.
I am stuck on a weird thing that you may know how to go around.

I use windows 7, 64bit. Eclipse 3.7.2.
Latest android SDK and NDK r8b.
I use the android example by latest SDL HG.
I do this on Android 2.2.

The example works ok but:

The problem is that ‘SDL_CreateWindow’ always gives a *16bit color context

and I need 32bit.
Its pixel format RGB_565 which is the default I heard.
I need pixel format RGBA_8888 but it doesnt switch.

I tried in c++:

SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);**
** SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);**
** SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);**
** SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);**
** SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);**
** SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);*
with no change.

I tried in SDLActivity.java in ‘onCreate’ before ‘setContentView’
   getWindow().setFormat(PixelFormat.RGBA_8888);**
** getWindow().addFlags(WindowManager.LayoutParams.FLAG_DITHER);*
no change at all.

It keeps choosing: ‘PixelFormat.RGB_565’ in ‘surfaceChanged’.

Can you help me?
Can that change to RGBA_8888?
Or is RGB_565 hard-coded somewhere inside the SDL code?

Thanks a lot,
George

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