A fairly simple feature - preferences for velocity sensitivity, but a
fair amount of UI infrastructure. This patch includes a new
KnobPreference, changes to KnobView to support a horizontal layout
(which works better in a layout with more compressed vertical space),
and of course the plumbing of the preference itself.
Also some rework of the touch handler in the KeyboardView. This patch
simplifies the logic a bit and fixes a long-standing bug in which the
pressure was always read from pointer index 0 rather than the pointer
index of the key being pressed.
Align keyboard at bottom of screen if there's plenty of space (tablets).
Use simpler logic (do as little as possible programatically, use XML to
do heavy lifting).
The main reason for these to be inside the KnobView is so that they can
be part of the touch target for the knob. A more general approach would
be to make the Knob a container that can contain TextView widgets, but
this is simpler.
This adjusts the dimensions of the knobs and scroll strip to be a little
better on both phones and tablets. The knobs look a little small, but
they'll be redesigned soon to work better in smaller sizes.
Maximum scroll and zoom range for the keyboard and strip, some style
changes to the knob views (to make them work better for light theme and
also scale for density). This version is basically at least as good as
the old view (although is still lacking octave buttons).
With these changes, there's a max height of 300dp, and a bit more room
in a phone layout (some of the hidden status message widgets were taking
vertical space).
This patch adds text labels (the logic is there for all keys, but we
only draw on C), glissando. and some fine-tuning. The glissando is more
because some touch events are misclassified as move, rather than to
implement actual glissando.
Also, this patch adds velocity, but not yet with adjustable sensitivity.
This patch adds crude touch processing (non multitouch, no tracking),
but it's enough to noodle out melodies to validate the new approach.
The patch also wires up the new view and starts to make some style
changes (holo light theme).
This patch implements nonlinear distortion in the resonant ladder
filter. It's based on the differential equations in the Huovilainen '04
DAFx paper, but using matrix exponential to compute the evolution of the
state variables. The implementation is scalar (and calls into sqrtf),
but designed to be implemented in very efficient SIMD.
The "com.google" namespace is reserved for official releases, so
renaming to "com.levien".
Also small tweaking to piano2.xml to clean it up for release (arguably
should have been separate commit, but oh well).
Add a button to capture raw start and end callback time (just putting it
in a text buffer so it can be copied), which is useful for making plots.
Also a bunch of commented out code to provoke priority inversion or
sudden increases in load (which exercises the governor), again for the
purpose of probing performance and making plots.
The android_glue unit now collects timestamp stats and reports them up
through a ring buffer to the app. The app currently just displays a raw
line in a text view, but we'll expand that out to smarter aggregation.
This change adds a (single) resonant filter to the C++ synth unit, and
wires up both USB MIDI and on-screen controls for cutoff and resonance.
Also fixes a bug in KnobView which caused the knob value to jump around.
Raph Levien
Bryan Klimt