RPU

Build a Scene

RPU combines declarative scenes with lightweight scripting. You describe what is on screen, attach behavior where it belongs, and run it through the CLI.

Start with a single sprite:

scene Main {    sprite Hero {        pos = (48, 56)        texture = "hero.png"        color = #f4f8ff    }}

1. Creates a scene named Main.
2. Places a sprite called Hero.
3. Draws hero.png with a starting position and tint.

Add Behavior

Then attach a script directly to the same node. The scene still owns structure. The script only owns behavior.

scene Main {    sprite Hero {        pos = (48, 56)        texture = "hero.png"                on update(dt) {            if input_left() {                self.x = self.x - 120.0 * dt            }        }    }}

That is the core RPU model: scene files describe what exists, scripts describe what changes, and the CLI builds and runs the project.