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blackberry / SDL

Simple DirectMedia Layer is an open-source, cross-platform multimedia library designed to provide a low level API.
GNU Lesser General Public License v2.1
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Possibility of supporting multi-touch? #22

Closed jgranick closed 12 years ago

jgranick commented 12 years ago

Hi,

SDL 1.2 does not include support for multi-touch, officially. However, Palm patched SDL to provide support for multi-touch input by adding a "which" property to the mouse events, similar to how SDL defines a "which" property for joystick buttons.

I am not sure of the specifics of how multi-touch works "under the hood" on the PlayBook, but if it provides touch point IDs, perhaps it would be possible to expose them as a "which" property on the mouse events?

This would be extraordinary if it is possible, as we already have support for multi-touch in Android, iOS and webOS, and adding a "which" property would immediately add BlackBerry support.

Thank you!

jnicholl commented 12 years ago

I believe we already support this? If you do not provide a sdl-controls.xml file, to tell SDL that you do not wish to use TouchControlOverlay, then I believe the SDL multi-mouse support will be used. Take a look at SDL_playbookevents.c, handleMtouchEvent calls SDL_PrivateMultiMouseButton and provides the contact id as the 'which' parameter. Let me know if it doesn't work or if part of the API is missing for you.

Thanks.

-----Original Message----- From: Joshua Granick [mailto:reply@reply.github.com] Sent: Wednesday, June 06, 2012 10:56 PM To: Jeremy Nicholl Subject: [SDL] Possibility of supporting multi-touch? (#22)

Hi,

SDL 1.2 does not include support for multi-touch, officially. However, Palm patched SDL to provide support for multi-touch input by adding a "which" property to the mouse events, similar to how SDL defines a "which" property for joystick buttons.

I am not sure of the specifics of how multi-touch works "under the hood" on the PlayBook, but if it provides touch point IDs, perhaps it would be possible to expose them as a "which" property on the mouse events?

This would be extraordinary if it is possible, as we already have support for multi-touch in Android, iOS and webOS, and adding a "which" property would immediately add BlackBerry support.

Thank you!

Reply to this email directly or view it on GitHub: https://github.com/blackberry/SDL/issues/22

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jgranick commented 12 years ago

Awesome!

With your direction, I found the code that defines the "event.motion.which" property. It is used when TOUCHPAD_SIMULATE is not defined.

Turns out, the define is commented out, so multi-touch is enabled by default. I was able to change "#ifdef WEBOS" to "#if defined(WEBOS) || defined(BLACKBERRY)" in a few places to enable multi-touch in NME. It works great.

I am sorry I missed this, and excited you already had it implemented. Thank you!

hamlatzis commented 11 years ago

I do receive mouse down/up & motion events for different fingers, but when I move two or more fingers at the same time the code runs sluggish. So it cannot be used for multi touch game