How to use
- Copy the installation command and review the source package before installing it in your own agent environment.
- Check the source document for required tools, credentials and supported hosts.
- Describe your input and desired deliverable; review the output against the source material.
npx skills add https://github.com/ewrogers/megadev-skills --skill megadev-compressionBefore you start
- Installation does not include a model subscription, API allowance or permission to access your files.
- Repository stars and installation counts describe activity, not an independent quality or security test.
Rendered from the source repository. Headings, examples, code, tables, links, and referenced images are preserved.
Megadev compression
Choose compression per asset and loading path. A smaller file can still cost more sectors, more working RAM or more time before an asset is usable. Preserve the game's asset formats, visual design and loading behavior.
- Read Formats and authoring for audited Megadev/BIOS
support, a deterministic Kosinski encoder and input/output validation.
- Read Loading and budgets for ownership, sector-sized
staging, peak RAM, Sub decoding and preloading trade-offs.
- Read Measurement and validation for real decoder
execution, timing limits, ARM64/AMD64 comparison and PAL/NTSC auditions.
Use ewrogers/megadev:latest; inspect its actual decoder and ABI before teaching calls. The audited SDK revision and primary links are in the references. Do not port SGDK's resource compiler, unpack calls or codec names as Megadev APIs.
Essential contracts:
- Bound source consumption, decoded length and history references before
calling a decoder that has no bounds arguments. Keep that validated source immutable until decoding completes. Validate the decoded asset before use.
- Round CD reads to 2048-byte sectors and reserve that full writable range.
Keep encoded input and output disjoint, with exclusive CPU ownership.
- A request acknowledgement, read completion, decode completion and visible
upload completion are different events. Cancellation/timeouts do not free buffers from a live reader or decoder.
- Keep decoding out of VBlank/interrupt handlers. Main/Sub separation can keep
gameplay responsive, but does not make decode cost or shared-bus work free.
- Report stored bytes, sectors, decoded bytes, active buffer usage and reserved
capacity separately. Compression does not shrink the final VRAM requirements.
The self-contained Compression Lab compares raw versus Kosinski artwork and an explicitly labeled random-noise sample. scripts/create_project.py generates a new project without replacing files. Its encoder, validator, measurement helpers and protocol are application code; Kos_Decomp is the actual SDK assembly decoder. Both raw and packed versions are included for comparison, not as a recommended shipping layout.
Reuse the game's existing reader, clock, memory leases and renderer. megadev-streaming owns loading mechanics, megadev-memory covers lifetimes, and megadev-performance covers broader profiling. This skill adds compression choice, validation and decode integration; it prescribes no art style or game flow.
