Android Bits

SDL Development
1

First first, great stuff for Android, for working out of the box.

SDL Friends Libraries could tie up better (full all in
android-full-project) for better set up experience (PNG & OGG Fan ;).
App fails to exit after main()'s return (needs a heavier exit()). Seems
Android’s java SDLActivity threading issue.
SDL2_net got no Android.mk, easily doable though, 4/5 source files, no deps.

Giving Back To Open Source ++ :slight_smile:

2

Oh, also to get it compiled there is some external deps issue, the jni
directory currenlty needs some links:
1 $ ls -lh jni
2
3 Android.mk
4 Application.mk
5 libmikmod-3.1.12 → SDL2_mixer-2.0.0/external/libmikmod-3.1.12/
6 libwebp-0.3.0 → SDL2_image-2.0.0/external/libwebp-0.3.0/
7 SDL2-2.0.3
8 SDL2_image-2.0.0
9 SDL2_mixer-2.0.0
10 SDL2_net-2.0.0
11 SDL2_ttf-2.0.12
12 smpeg2-2.0.0 → SDL2_mixer-2.0.0/external/smpeg2-2.0.0/
13 src

And that needs to be reflected in the SDLActivity.java:
47 // Load the .so
48 static {
49 System.loadLibrary(“SDL2”);
50 System.loadLibrary(“SDL2_image”);
51 System.loadLibrary(“mikmod”);
52 System.loadLibrary(“smpeg2”);
53 System.loadLibrary(“SDL2_mixer”);
54 System.loadLibrary(“SDL2_ttf”);
55 System.loadLibrary(“SDL2_net”);
56 System.loadLibrary(“main”);
57 }
58
Ideally none of the external deps should be exposed so explicitily, done
with freetype, libogg, etcetera, but for the run… :wink:

Here is the mentioned SDL2_net-2.0.0/Android.mk i use, I link though i
still do not call anything of it:
1 LOCAL_PATH := $(call my-dir)
2
3 include $(CLEAR_VARS)
4
5 LOCAL_MODULE := SDL2_net
6
7 LOCAL_C_INCLUDES := $(LOCAL_PATH)
8
9 LOCAL_SRC_FILES := SDLnet.c SDLnetTCP.c SDLnetUDP.c SDLnetselect.c
10
11 LOCAL_SHARED_LIBRARIES := SDL2
12
13 LOCAL_EXPORT_C_INCLUDES += $(LOCAL_C_INCLUDES)
14
15 include $(BUILD_SHARED_LIBRARY)

That’s all,On Thu, Apr 10, 2014 at 2:59 PM, Juan Manuel Borges Ca?o < @Juan_Manuel_Borges_C> wrote:

First first, great stuff for Android, for working out of the box.

SDL Friends Libraries could tie up better (full all in
android-full-project) for better set up experience (PNG & OGG Fan ;).
App fails to exit after main()'s return (needs a heavier exit()). Seems
Android’s java SDLActivity threading issue.
SDL2_net got no Android.mk, easily doable though, 4/5 source files, no
deps.

Giving Back To Open Source ++ :slight_smile:

3

Add to it the SDl2_image jpeg x86 .S arm asm issue.

This one wasn’t easy to find, Any way to catch physical buttons Menu and
Back? and while at it say, the full Android Physical Buttons, Power, Volume
Up, Down, Camera, … The SDLK table seems very PC centric.

Anyone reading? Cause i’m assuming ;-)On Thu, Apr 10, 2014 at 4:28 PM, Juan Manuel Borges Ca?o < @Juan_Manuel_Borges_C> wrote:

Oh, also to get it compiled there is some external deps issue, the jni
directory currenlty needs some links:
1 $ ls -lh jni
2
3 Android.mk
4 Application.mk
5 libmikmod-3.1.12 → SDL2_mixer-2.0.0/external/libmikmod-3.1.12/
6 libwebp-0.3.0 → SDL2_image-2.0.0/external/libwebp-0.3.0/
7 SDL2-2.0.3
8 SDL2_image-2.0.0
9 SDL2_mixer-2.0.0
10 SDL2_net-2.0.0
11 SDL2_ttf-2.0.12
12 smpeg2-2.0.0 → SDL2_mixer-2.0.0/external/smpeg2-2.0.0/
13 src

And that needs to be reflected in the SDLActivity.java:
47 // Load the .so
48 static {
49 System.loadLibrary(“SDL2”);
50 System.loadLibrary(“SDL2_image”);
51 System.loadLibrary(“mikmod”);
52 System.loadLibrary(“smpeg2”);
53 System.loadLibrary(“SDL2_mixer”);
54 System.loadLibrary(“SDL2_ttf”);
55 System.loadLibrary(“SDL2_net”);
56 System.loadLibrary(“main”);
57 }
58
Ideally none of the external deps should be exposed so explicitily, done
with freetype, libogg, etcetera, but for the run… :wink:

Here is the mentioned SDL2_net-2.0.0/Android.mk i use, I link though i
still do not call anything of it:
1 LOCAL_PATH := $(call my-dir)
2
3 include $(CLEAR_VARS)
4
5 LOCAL_MODULE := SDL2_net
6
7 LOCAL_C_INCLUDES := $(LOCAL_PATH)
8
9 LOCAL_SRC_FILES := SDLnet.c SDLnetTCP.c SDLnetUDP.c SDLnetselect.c
10
11 LOCAL_SHARED_LIBRARIES := SDL2
12
13 LOCAL_EXPORT_C_INCLUDES += $(LOCAL_C_INCLUDES)
14
15 include $(BUILD_SHARED_LIBRARY)

That’s all,

On Thu, Apr 10, 2014 at 2:59 PM, Juan Manuel Borges Ca?o < @Juan_Manuel_Borges_C> wrote:

First first, great stuff for Android, for working out of the box.

SDL Friends Libraries could tie up better (full all in
android-full-project) for better set up experience (PNG & OGG Fan ;).
App fails to exit after main()'s return (needs a heavier exit()). Seems
Android’s java SDLActivity threading issue.
SDL2_net got no Android.mk, easily doable though, 4/5 source files, no
deps.

Giving Back To Open Source ++ :slight_smile:

4

Menu is SDL_SCANCODE_MENU and back is SDL_SCANCODE_AC_BACK. Not sure about
the others.

The app failing to exit is just how Android works. The intention is that it
allows the app to quickly come back up again if the user opens it again.
You can use it as an opportunity to save resources so they don’t have to be
loaded again, or you can call exit() to force close the process and make
sure it’s reloaded afresh next time, but this doesn’t always look as smooth.

2014-04-20 0:49 GMT+02:00 Juan Manuel Borges Ca?o :> Add to it the SDl2_image jpeg x86 .S arm asm issue.

This one wasn’t easy to find, Any way to catch physical buttons Menu and
Back? and while at it say, the full Android Physical Buttons, Power, Volume
Up, Down, Camera, … The SDLK table seems very PC centric.

Anyone reading? Cause i’m assuming :wink:

On Thu, Apr 10, 2014 at 4:28 PM, Juan Manuel Borges Ca?o < juanmabcmail at gmail.com> wrote:

Oh, also to get it compiled there is some external deps issue, the jni
directory currenlty needs some links:
1 $ ls -lh jni
2
3 Android.mk
4 Application.mk
5 libmikmod-3.1.12 → SDL2_mixer-2.0.0/external/libmikmod-3.1.12/
6 libwebp-0.3.0 → SDL2_image-2.0.0/external/libwebp-0.3.0/
7 SDL2-2.0.3
8 SDL2_image-2.0.0
9 SDL2_mixer-2.0.0
10 SDL2_net-2.0.0
11 SDL2_ttf-2.0.12
12 smpeg2-2.0.0 → SDL2_mixer-2.0.0/external/smpeg2-2.0.0/
13 src

And that needs to be reflected in the SDLActivity.java:
47 // Load the .so
48 static {
49 System.loadLibrary(“SDL2”);
50 System.loadLibrary(“SDL2_image”);
51 System.loadLibrary(“mikmod”);
52 System.loadLibrary(“smpeg2”);
53 System.loadLibrary(“SDL2_mixer”);
54 System.loadLibrary(“SDL2_ttf”);
55 System.loadLibrary(“SDL2_net”);
56 System.loadLibrary(“main”);
57 }
58
Ideally none of the external deps should be exposed so explicitily, done
with freetype, libogg, etcetera, but for the run… :wink:

Here is the mentioned SDL2_net-2.0.0/Android.mk i use, I link though i
still do not call anything of it:
1 LOCAL_PATH := $(call my-dir)
2
3 include $(CLEAR_VARS)
4
5 LOCAL_MODULE := SDL2_net
6
7 LOCAL_C_INCLUDES := $(LOCAL_PATH)
8
9 LOCAL_SRC_FILES := SDLnet.c SDLnetTCP.c SDLnetUDP.c SDLnetselect.c
10
11 LOCAL_SHARED_LIBRARIES := SDL2
12
13 LOCAL_EXPORT_C_INCLUDES += $(LOCAL_C_INCLUDES)
14
15 include $(BUILD_SHARED_LIBRARY)

That’s all,

On Thu, Apr 10, 2014 at 2:59 PM, Juan Manuel Borges Ca?o < juanmabcmail at gmail.com> wrote:

First first, great stuff for Android, for working out of the box.

SDL Friends Libraries could tie up better (full all in
android-full-project) for better set up experience (PNG & OGG Fan ;).
App fails to exit after main()'s return (needs a heavier exit()). Seems
Android’s java SDLActivity threading issue.
SDL2_net got no Android.mk, easily doable though, 4/5 source files, no
deps.

Giving Back To Open Source ++ :slight_smile:

SDL mailing list
SDL at lists.libsdl.org
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

–
Jorge “Vino” Rodr?guez
[ Tw http://twitter.com/vinobs | Fb http://www.facebook.com/bsvino
| G+http://www.google.com/profiles/bs.vino|
Ht http://vinoisnotouzo.com ]

5

Jorge Rodriguez, the SDL_SCANCODE_* are good news, thanks, didn’t knew
about that as an option for Key/Button events, works great :smiley: , the lack
of internet documentation on forums, posts, etc. made it hard to find as of
date. Good stuff, thanks!

Design Discussion:

If i code an explicit code flow end when say the users presses Back Button,
main returning EXIT_SUCCESS, behaving in another way is not the C expected
behaviour, the app thread is tricky and not following the expectation on
flow behaviour. Not that i find the resource cached loading bad, but i
would consider to do it myself, say, with some app backgrounding call, how
many apps until you get out of memory?, performance?, batteries? speed?.
Say my app is gonna be heavy load, play once, 20 minutes, close it for
long, cached resources is not an issue or a need, thank I can close the app
with an exit().

SDL_SetLogicalSize( …, w, h), is kind of misleading in that okay, what
ever your design decision was you request aspect ratio matchs display mode
or stretching, occurs, but then why take redundant w, h, just say take an
scale factor, SDL_SetLogicalScale(…, s) since if i would want an
stretching, i would set it with the display mode and “window” creation.
Important things: misleading params, consider LogicalScale, stretching
mades sense for create window.

I’ve read Ryan Gordon say, “Don’t harcode your app to any sizes”, but that
hardcodes to some physical ratio a logical size. No big deal, i just set
logical height and width = height * ratio, but kind of makes more sense. To
admit, i think he’s right and i should have gone, probably gonna rewrite,
screen space on dstrects instead of image space ;-).

Anyway, not work stoppers, Thanks! ;-)On Sun, Apr 20, 2014 at 4:14 PM, Jorge Rodriguez <bs.vino at gmail.com> wrote:

Menu is SDL_SCANCODE_MENU and back is SDL_SCANCODE_AC_BACK. Not sure about
the others.

The app failing to exit is just how Android works. The intention is that
it allows the app to quickly come back up again if the user opens it again.
You can use it as an opportunity to save resources so they don’t have to be
loaded again, or you can call exit() to force close the process and make
sure it’s reloaded afresh next time, but this doesn’t always look as smooth.

2014-04-20 0:49 GMT+02:00 Juan Manuel Borges Ca?o <@Juan_Manuel_Borges_C>
:

Add to it the SDl2_image jpeg x86 .S arm asm issue.

This one wasn’t easy to find, Any way to catch physical buttons Menu and
Back? and while at it say, the full Android Physical Buttons, Power, Volume
Up, Down, Camera, … The SDLK table seems very PC centric.

Anyone reading? Cause i’m assuming :wink:

On Thu, Apr 10, 2014 at 4:28 PM, Juan Manuel Borges Ca?o < @Juan_Manuel_Borges_C> wrote:

Oh, also to get it compiled there is some external deps issue, the jni
directory currenlty needs some links:
1 $ ls -lh jni
2
3 Android.mk
4 Application.mk
5 libmikmod-3.1.12 → SDL2_mixer-2.0.0/external/libmikmod-3.1.12/
6 libwebp-0.3.0 → SDL2_image-2.0.0/external/libwebp-0.3.0/
7 SDL2-2.0.3
8 SDL2_image-2.0.0
9 SDL2_mixer-2.0.0
10 SDL2_net-2.0.0
11 SDL2_ttf-2.0.12
12 smpeg2-2.0.0 → SDL2_mixer-2.0.0/external/smpeg2-2.0.0/
13 src

And that needs to be reflected in the SDLActivity.java:
47 // Load the .so
48 static {
49 System.loadLibrary(“SDL2”);
50 System.loadLibrary(“SDL2_image”);
51 System.loadLibrary(“mikmod”);
52 System.loadLibrary(“smpeg2”);
53 System.loadLibrary(“SDL2_mixer”);
54 System.loadLibrary(“SDL2_ttf”);
55 System.loadLibrary(“SDL2_net”);
56 System.loadLibrary(“main”);
57 }
58
Ideally none of the external deps should be exposed so explicitily, done
with freetype, libogg, etcetera, but for the run… :wink:

Here is the mentioned SDL2_net-2.0.0/Android.mk i use, I link though i
still do not call anything of it:
1 LOCAL_PATH := $(call my-dir)
2
3 include $(CLEAR_VARS)
4
5 LOCAL_MODULE := SDL2_net
6
7 LOCAL_C_INCLUDES := $(LOCAL_PATH)
8
9 LOCAL_SRC_FILES := SDLnet.c SDLnetTCP.c SDLnetUDP.c SDLnetselect.c
10
11 LOCAL_SHARED_LIBRARIES := SDL2
12
13 LOCAL_EXPORT_C_INCLUDES += $(LOCAL_C_INCLUDES)
14
15 include $(BUILD_SHARED_LIBRARY)

That’s all,

On Thu, Apr 10, 2014 at 2:59 PM, Juan Manuel Borges Ca?o < @Juan_Manuel_Borges_C> wrote:

First first, great stuff for Android, for working out of the box.

SDL Friends Libraries could tie up better (full all in
android-full-project) for better set up experience (PNG & OGG Fan ;).
App fails to exit after main()'s return (needs a heavier exit()). Seems
Android’s java SDLActivity threading issue.
SDL2_net got no Android.mk, easily doable though, 4/5 source files, no
deps.

Giving Back To Open Source ++ :slight_smile:

SDL mailing list
SDL at lists.libsdl.org
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

–
Jorge “Vino” Rodr?guez
[ Tw http://twitter.com/vinobs | Fb http://www.facebook.com/bsvino |
G+ http://www.google.com/profiles/bs.vino | Hthttp://vinoisnotouzo.com]

SDL mailing list
SDL at lists.libsdl.org
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

6

2014-04-23 13:44 GMT+02:00 Juan Manuel Borges Ca?o :

If i code an explicit code flow end when say the users presses Back
Button, main returning EXIT_SUCCESS, behaving in another way is not the C
expected behaviour, the app thread is tricky and not following the
expectation on flow behaviour. Not that i find the resource cached loading
bad, but i would consider to do it myself, say, with some app backgrounding
call, how many apps until you get out of memory?, performance?, batteries?
speed?. Say my app is gonna be heavy load, play once, 20 minutes, close it
for long, cached resources is not an issue or a need, thank I can close the
app with an exit().

Once a normal exit occurs (ie, the main() function returns) the program
binary sits in memory invisible to the user (not in the Android task list)
until the Android OS decides it wants to reclaim the memory. Then the
process is killed and all memory is then freed. This happens automatically
and you don’t need to do anything. It probably uses some kind of recency
algorithm to decide when to kill what processes. If you want your app to
remain closed for a long time then either force an exit with exit(), or
make sure you free all resources before your main() exits and trust Android
to kill the process when it feels best about it. On my tablet if you force
an app to close with exit() the close animation doesn’t play and it’s not
as pretty, so I did the work to make sure I freed everything.–
Jorge “Vino” Rodr?guez
[ Tw http://twitter.com/vinobs | Fb http://www.facebook.com/bsvino
| G+http://www.google.com/profiles/bs.vino|
Ht http://vinoisnotouzo.com ]

7

Ok, so on a side, i’d like to note that for stopping music when app goes
background:
There is a recent thread about it, her advice works greatly, catching
SDL_APP_WILLENTERBACKGROUND to Pause and SDL_APP_WILLENTERFOREGROUND to
Resume.

Continuing on the exit issue, so when i do return EXIT_SUCCESS; from my
jni/main.c main() flow, if the app is demanded by the user again, the app
would restart as usual, only if i don’t explicitly killed the assets
memory, they are still there?
To clarify:

int
main()
{
Assets *assets;
assets = LoadAssets();
while(!done)
Use(assets);
return EXIT_SUCCESS;
}

I can’t use a NULL or NOT approach, since i’d have to set the assets to
NULL at start, if the app restart as usual, the assets would reset to NULL,
just not freed, and reloaded again.

So what i need seems an obscure, by that i mean, not explicity, event for
SDL_APP_WILLEXIT that in fact, will not exit, and then can recover with an
SDL_APP_WILLRECOVER. Or if assets can be reused from main i don’t see how.

At the end i’m gonna think i need/use an SDL_Foreground() equivalent.

Cares to just clarify, with such a simplistic, not detailed, generic
example?On Wed, Apr 23, 2014 at 2:43 PM, Jorge Rodriguez <bs.vino at gmail.com> wrote:

2014-04-23 13:44 GMT+02:00 Juan Manuel Borges Ca?o <@Juan_Manuel_Borges_C

:

If i code an explicit code flow end when say the users presses Back

Button, main returning EXIT_SUCCESS, behaving in another way is not the C
expected behaviour, the app thread is tricky and not following the
expectation on flow behaviour. Not that i find the resource cached loading
bad, but i would consider to do it myself, say, with some app backgrounding
call, how many apps until you get out of memory?, performance?, batteries?
speed?. Say my app is gonna be heavy load, play once, 20 minutes, close it
for long, cached resources is not an issue or a need, thank I can close the
app with an exit().

Once a normal exit occurs (ie, the main() function returns) the program
binary sits in memory invisible to the user (not in the Android task list)
until the Android OS decides it wants to reclaim the memory. Then the
process is killed and all memory is then freed. This happens automatically
and you don’t need to do anything. It probably uses some kind of recency
algorithm to decide when to kill what processes. If you want your app to
remain closed for a long time then either force an exit with exit(), or
make sure you free all resources before your main() exits and trust Android
to kill the process when it feels best about it. On my tablet if you force
an app to close with exit() the close animation doesn’t play and it’s not
as pretty, so I did the work to make sure I freed everything.

–
Jorge “Vino” Rodr?guez
[ Tw http://twitter.com/vinobs | Fb http://www.facebook.com/bsvino |
G+ http://www.google.com/profiles/bs.vino | Hthttp://vinoisnotouzo.com]

SDL mailing list
SDL at lists.libsdl.org
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

8

OK, i’m fine with exit, by the way, i think we confuse the “suspend app”
“middle” button with the “close app” “left” (“arrow”) button.On Mon, Apr 28, 2014 at 1:18 PM, Juan Manuel Borges Ca?o < @Juan_Manuel_Borges_C> wrote:

Ok, so on a side, i’d like to note that for stopping music when app goes
background:
There is a recent thread about it, her advice works greatly, catching
SDL_APP_WILLENTERBACKGROUND to Pause and SDL_APP_WILLENTERFOREGROUND to
Resume.

Continuing on the exit issue, so when i do return EXIT_SUCCESS; from my
jni/main.c main() flow, if the app is demanded by the user again, the app
would restart as usual, only if i don’t explicitly killed the assets
memory, they are still there?
To clarify:

int
main()
{
Assets *assets;
assets = LoadAssets();
while(!done)
Use(assets);
return EXIT_SUCCESS;
}

I can’t use a NULL or NOT approach, since i’d have to set the assets to
NULL at start, if the app restart as usual, the assets would reset to NULL,
just not freed, and reloaded again.

So what i need seems an obscure, by that i mean, not explicity, event for
SDL_APP_WILLEXIT that in fact, will not exit, and then can recover with an
SDL_APP_WILLRECOVER. Or if assets can be reused from main i don’t see how.

At the end i’m gonna think i need/use an SDL_Foreground() equivalent.

Cares to just clarify, with such a simplistic, not detailed, generic
example?

On Wed, Apr 23, 2014 at 2:43 PM, Jorge Rodriguez <bs.vino at gmail.com>wrote:

2014-04-23 13:44 GMT+02:00 Juan Manuel Borges Ca?o <
@Juan_Manuel_Borges_C>:

If i code an explicit code flow end when say the users presses Back

Button, main returning EXIT_SUCCESS, behaving in another way is not the C
expected behaviour, the app thread is tricky and not following the
expectation on flow behaviour. Not that i find the resource cached loading
bad, but i would consider to do it myself, say, with some app backgrounding
call, how many apps until you get out of memory?, performance?, batteries?
speed?. Say my app is gonna be heavy load, play once, 20 minutes, close it
for long, cached resources is not an issue or a need, thank I can close the
app with an exit().

Once a normal exit occurs (ie, the main() function returns) the program
binary sits in memory invisible to the user (not in the Android task list)
until the Android OS decides it wants to reclaim the memory. Then the
process is killed and all memory is then freed. This happens automatically
and you don’t need to do anything. It probably uses some kind of recency
algorithm to decide when to kill what processes. If you want your app to
remain closed for a long time then either force an exit with exit(), or
make sure you free all resources before your main() exits and trust Android
to kill the process when it feels best about it. On my tablet if you force
an app to close with exit() the close animation doesn’t play and it’s not
as pretty, so I did the work to make sure I freed everything.

–
Jorge “Vino” Rodr?guez
[ Tw http://twitter.com/vinobs | Fb http://www.facebook.com/bsvino |
G+ http://www.google.com/profiles/bs.vino | Hthttp://vinoisnotouzo.com]

SDL mailing list
SDL at lists.libsdl.org
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

9

Does sdl define some kind of macro like SDL_MOBILE or SDL_DESKTOP? So i
don’t need to check manually ANDROID or IOS not saying the ones i don’t
even know and would force reediting (of my local SDL_MOBILE ;-)).

10

Mmm, SDL_Haptic seems not 100% reliable Desktop does not take 0.5 seconds
rumble, 1.0 seconds does it though. And, droid seems to be in a limbo
Haptic Rumble & Vibration speaking, bummer. Such a basic input feature for
phones. And it seems the API is really small…