kmeisthax/brewbase-gb

Basic template for homebrew projects targeting GB/GBC

brewbase-gb's Issues

Wide/Sparse fonts

Currently, TextServices assumes fonts have a contiguous array of glyphs and metrics. This poses an upper limit on the size of a font's glyphs and metrics to 16kb. In the worst-case scenario of a 16x16 font, we can only fit 512 glyphs per bank, which is a hard limit on how many glyphs may exist per font. Depending on the language of the homebrew developer, there may be reasons to have more than 512 glyphs in a font, such as writing their game in kanji.

To solve this, changes need to be made to the font structure and related code:

1. The font glyph base pointer needs to be replaced with a length-bounded table of glyph header structures. Each glyph header contains a base glyph ID, glyph count, and far pointer to the graphics data.
2. The font metrics base pointer needs to be replaced with a length-bounded table of metrics header structures with the same format as the glyph header structure.

Input handling

We don't have a lib for input handling, so programs have to read REG_P1 directly. Not a good idea, as there's various considerations for input handling we need to watch for. We need a lib for input handling with the following features:

• Debounce
• Changed vs. held checks ("half-A" presses)
• Typematic checks (hold a button to register periodic presses)
• Input instrumentation (simulated input, replay/demos/etc)
• Multiple controller input (SGB mode, inputs from other Gameboys sent via SIO, etc)