Canvas Backend API

The JS-only Canvas backend consumes @frontend.DrawList, rasterizes it through the frontend perspective-correct Z-buffer, and writes merged horizontal runs to a browser CanvasRenderingContext2D.

Types

• CanvasColor::rgb(red, green, blue) clamps RGB channels to 0..255.
• CanvasRenderConfig::default() creates a 640 x 480 configuration.
• CanvasRenderConfig::sized(width, height) creates a configuration with the default dark background, cyan foreground, and 256 shade levels.

Rendering

• render_draw_list(context, draw_list, config) renders into an existing 2D context.
• render_scene(context, scene, render_view, config) builds and renders a draw list.
• render_canvas(canvas, draw_list, config) sets the canvas pixel size, obtains its 2D context, and renders the draw list.

Run just canvas-serve and open http://localhost:8080. The demo selector switches between a rotating torus and the Dolly zoom scene. Dolly uses the same rotating cube, 35-disc wall, camera-distance curve, and focal-length compensation as the terminal demo.