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Engine

Engine

The quadx engine is the reason qdx exists. Its core is qdx source in engine/, and a program uses it by naming those files on the command line with the standard library.

bootstrap/qdx run std/*.qdx engine/*.qdx game.qdx

The core is early. It has three parts today, and no renderer, no input and no game language on top yet.

Fixed-point numbers
Fractions that give the same answer on every machine.
The world
Entities, components, handles and snapshots.
Ticks
Commands, steps, journals and replay.

What it is built to guarantee

  • The same inputs give the same world. There are no floating-point numbers, no clocks and no hidden state. A recorded run replays exactly.
  • The whole world can be read as text. Any state can be printed, compared and inspected without a screen.
  • A snapshot costs almost nothing to take. Memory is shared with the live world until one of them changes.