Simple Paint — Devlog #01: GPU Brush Stamps

Vigil № 0001 — Simple Paint. Picking up dev log notes for the painting tool after a long quiet stretch.

What changed in 2.0.1

• Brush stamps now sample a texture instead of solid colour. Texture array, indexed by brush id.
• The compute kernel runs on a render texture target now, not a CPU Texture2D. ~14x faster on the Pixel 7.
• Pressure curve is a AnimationCurve baked to a 256-entry LUT each frame the curve changes. No per-stamp evaluation cost.

Known issues

• Stamp seams visible when the user paints faster than the stamp spacing. Need to interpolate stamp positions between input samples.
• Eraser is a colour brush right now. Real alpha erasing is the next pass.

The version on the Asset Store is still 2.0.0. Next push: brush spacing fix + the alpha eraser.