Feather Harness

Small standalone macOS/Metal harness for iterating on feathering without the full Defold text pipeline.

Current scope:

• offscreen Metal render
• optional interactive Metal app mode
• one hardcoded L-shape
• analytic feathering in the fragment shader
• PNG output for deterministic inspection

Build:

cd feather
./build.sh

Run:

./build/feather_harness --output build/l_shape.png

Interactive mode:

./build/feather_harness --interactive --width 768 --height 768 --feather 28 --output build/l_shape.png

Useful flags:

./build/feather_harness --output build/l_shape.png --width 512 --height 512 --feather 28
./build/feather_harness --interactive --output build/l_shape.png --feather 28
./build/feather_harness --help

Interactive controls:

• Arrow keys: change feather amount
• Mouse drag horizontally: change feather amount
• S: save a PNG with a unique iteration suffix

The current feather amount is shown in the top-right corner of the window.

Notes:

• This harness is intentionally isolated from font loading, text layout, and Defold material/shader translation.
• The first shader pass uses a simple Rive-inspired analytic feather function for one known problematic corner shape. It is a testbed, not a finished port.