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Showing posts from May, 2011

Clutter on Android: first results

With the release of Android 2.3, there's a decent way to integrate native applications with the NativeActivity class, an EGL library, and some C API to expose events, main loop, etc. So? how about porting Clutter to it now that it looks actually feasible? After a few days of work, the first results are there, quite promising!

There's still a fairly large number of items in my TODO before being happy with the state of this work, the most prominent items are:
Get a clean up pass done to have something upstreamable, this includes finishing the event integration (it receives events but not yet forward them to Clutter),Come up with a plan to manage the application life cycle and handle the case when Android destroys the EGL surface that you were using (probably by having the app save a state, and properly tear down Clutter).,While you probably have the droid font installed in /system/fonts, this is not part of the advertised NDK interface. The safest choice is to embed the font …

A simple transition effect with Clutter

When doing something with graphics, your first need an idea (granted, as with pretty much everything else). In this case, a simple transition that I've seen somewhere a long time ago and I wanted to reproduce with Clutter.


The code is available in a branch of a media explorer I'm currently working on. A few bullet points to follow the code:
As the effect needs a "screenshot" of a Clutter scene to play with. You first need to create a subclass of ClutterOffscreenEffect as it does the work of redirecting the painting of a subtree of actors in an offscreen buffer that you can  reuse to texture the rectangles you'll be animating in the effect. This subclass has a "progress" property to control the animation.Then actually compute the coordinates of the grid cells both in screen space and in texture space. To be able to use cogl_rectangles_with_texture_coords(), to try limit the number of GL calls (and/or by the Cogl journal and to ease the animation of the c…