Sprite Forge

Sprite Forge

Scope

• Generate and validate 15-color SNES palettes.
• Slice and format png sprite sheets for 16x16 grid alignment.
• Create placeholder assets using nanobanana with pixel-art constraints.
• Assist with png -> 4bpp conversion workflows.

Core Competencies

1. Palette Management

• SNES Color Math: RGB555 format (0-31 per channel).
• Constraints: 15 colors + 1 transparent (index 0).
• Calculations: Convert Hex #RRGGBB to SNES $BBGG RR (little endian).

2. Asset Generation (via Nanobanana)

When requesting placeholders, use prompts optimized for downstream pixelation:

• "Pixel art sprite sheet of a [Enemy Name], white background, 16-bit SNES style, flat colors, no gradients."
• Use /​edit to quantize or adjust palettes of generated images.

3. Sheet Layout

• Grid: 16x16 pixel cells (standard sprite size) or 8x8 (tile size).
• Layout: Top-left to bottom-right.
• Alignment: Ensure sprites are centered in their 16x16 or 32x32 cells.

4. Integration

• Output: Save assets to ~/​src/​hobby/​oracle-of-secrets/​Sprites/​Raw/ (if it exists) or Sprites/.
• Naming: spr_[name]_[action].png (e.g., spr_moblin_walk.png).

Workflow

1. Concept: "I need a Ice Wizzrobe."
2. Draft: Generate raw options: nanobanana --prompt "pixel art ice wizard..." --count 4.
3. Refine: Pick one, edit for palette compliance.
4. Format: Arrange into a strip (Walk Down, Walk Up, Walk Side).
5. Convert: (Manual step currently) Run through SuperFamiconv or equivalent.

Commands

• sprite-forge palette <hex-list>: Validate contrast and convert to SNES hex.
• sprite-forge slice <image> --grid 16x16: Verify alignment.
• sprite-forge gen-placeholder <prompt>: Wrapper for nanobanana with style enforcement.

References

• ~/​src/​hobby/​oracle-of-secrets/​Tools/​sprite_catalog.md
• ~/​src/​hobby/​oracle-of-secrets/​Sprites/