67 lines
2.2 KiB
Markdown
67 lines
2.2 KiB
Markdown
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# Honeylisp
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## Introduction
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* 286 project
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* Honeylisp vision
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## Assembler
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### What is an assembler?
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* I _thought_ the hard part was going to be converting mnemonics to bytes
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* Turns out the hard part is actually converting labels to bytes
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* zero-page instructions are a different size!
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### How it works
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* Represent each opcode as a Fennel data literal
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* nest blocks arbitrarily - "lexical scope"
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* multi-pass
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## VM
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* Forth-ish stack machine
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* "direct threaded" inner interpreter
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* extend assembler with :vm directive
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* "immediate words" are just Fennel functions
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## Lite
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* Minimal extensible text editor built in Lua
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* love2d port
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## Custom Editors
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* imgui style
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* show tile editor with map editor
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* font + portrait editors based on tile editor
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* generate bytes / code with fennel functions! (maps, gfx, etc)
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## MAME Upload
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* Nod to Dagen Brock's 2016 KFest talk on GSPlus https://www.youtube.com/watch?v=1LzCmpAanpE
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* Integrated Jeejah networked REPL into MAME
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* Can send arbitrary Fennel code to MAME to control it
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* Poke blocks of memory over the network (nREPL uses bencode from bittorrent, which allows this to be fairly low overhead)
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## Live Code Injection
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* The assembled program is an object in memory, which we can extend interactively
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* We can write new code and poke it into memory while the old code is running!
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* Game code is a loop - we can have a "sync point" at the top of the loop where the state of the game is well-known
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* (demo switching video modes, printing debug output, making sounds)
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## Hot Reload
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* Because the assembled program is an object in memory
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## Tape generation
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* Benefit of building tools in a game engine - I can just output audio
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* Extended assembler to accept BASIC tokens and generate linked list of BASIC lines, so the whole thing could be bootstrapped
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## Disk generation
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* Take a ProDOS disk image, parse it, and add files to it
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* Generate loader program, rest of game can be loaded as an overlay
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* New disk image is generated on every build because why not? It's fast
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## Neu] [ower
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* Fun tricks: Random number generator (never used for gameplay purposes) = just dump a couple dozen random bytes
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## 8-Bitsy
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* Full "code-optional" environment
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* Kind of awkward to actually use, but it works!
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* Son drew some art
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* Improvisational game design!
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