I read the Android documentation about allocations and I also used them in few renderscripts. But there is something that still I couldn't understand.
If I create an allocation with createTyped() I create the structure but not the buffer, actually until now I used this method for input allocations and the buffer is then assigned when it does ioReceive(). To create an output allocation usually I use createFromBitmap() because this method also allocates the buffer. Otherwise to assign the buffer I can use setSurface().
But now I need an output allocation for a 2D float array, how can initialize and assign the buffer for such allocation?
You can create the allocation with createTyped() and then initialize it by calling copyFrom(myfloatarray) where myfloatarray is an array of float values in Java.