FFglitch uses the quickjs engine to provide native JavaScript support. FFglitch also provides extra JavaScript functionality which can greatly speed up the glitching process.

Below you will find the technical documentation of these new types and classes. At least some basic knowledge of JavaScript is expected.

FFArrays and FFPtrs are based on the built-in Typed Arrays, but with a lot of functionality and complexity removed to provide a simpler and faster implementation.

MV and MVRef are a simple representation of a [ horizontal, vertical ] motion vector.

MVArray and MVPtr are similar to FFArrays and FFPtrs, but they contain motion vectors instead of simple integer values. There is also a helper MVMask type.

MV2DArray and MV2DPtr are similar to MVArray and MVPtr, but they contain a 2-dimensional array of motion vectors instead of a single array of motion vectors. There is also a helper MV2DMask type.

The Math.prototype.lround() method (a round to nearest integer method) has been added to the to the Math prototype. It is equivalent to:

Math.lround = (x) => Math.sign(x) * Math.round(Math.abs(x));

The reason behind this is that the JavaScript Math.round() method behaves differently from most other programming languages, in that it rounds half-increments away from zero, and I don’t like that. For example, I prefer that -3.5 rounds to -4 instead of -3:

print(Math.round(+3.5));  // 4
print(Math.lround(+3.5)); // 4
print(Math.round(-3.5));  // -3
print(Math.lround(-3.5)); // -4

FFglitch has SDL support integrated into quickjs.

This enables fflive to use keyboard, mouse, and joysticks input devices.

FFglitch has RtMidi support integrated into quickjs.

This enables ffgac, ffedit, and fflive to use MIDI controllers as input devices.

FFglitch has ZeroMQ support integrated into quickjs.

This enables ffgac, ffedit, and fflive to do many kinds of network communication and messaging.