mirror of
https://github.com/imjasonh/nescript
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53 lines
2.5 KiB
Text
53 lines
2.5 KiB
Text
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// sha256/state.ne — global variables.
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//
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// Every piece of cross-handler state lives here so Entering,
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// Computing, and Showing can share buffers (and, crucially, so
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// the message buffer survives the state transition from
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// Entering → Computing without being reinitialised).
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// ── Cursor position on the keyboard ─────────────────────────
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var kb_row: u8 = 0 // 0..KB_ROWS-1
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var kb_col: u8 = 0 // 0..KB_COLS-1
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// ── Input buffer + length ───────────────────────────────────
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var msg: u8[16] // INPUT_MAX ASCII bytes
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var msg_len: u8 = 0 // 0..INPUT_MAX
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// ── SHA-256 working memory ──────────────────────────────────
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//
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// `h_state` holds the running hash (8 u32 words, little-endian);
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// it's initialised from H_INIT on every new compression so users
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// can run more than one hash per power-on. `w` is the 64-entry
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// message schedule (256 bytes). `wk` is the scratch area that
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// hosts the a..h registers plus T1/T2/Σ/tmp — see
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// constants.ne for the byte offsets.
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var h_state: u8[32]
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var w: u8[256]
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var wk: u8[64]
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// ── Compression driver state ────────────────────────────────
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//
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// The compression is split across frames so the main loop never
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// overruns vblank. `cp_phase` selects which block of work runs
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// this frame; see computing_state.ne for the phase table.
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var cp_phase: u8 = 0
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// ── Input-idle timer ────────────────────────────────────────
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//
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// Incremented every frame while Entering sees no button presses.
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// When it reaches AUTO_DELAY the state auto-types DEMO_TEXT and
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// transitions to Computing, so the headless jsnes golden always
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// captures a populated hash screen.
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var idle_timer: u8 = 0
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// Debounces repeat-fire for the face and special keys so one
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// press is registered as one key press rather than one per frame
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// held.
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var debounce: u8 = 0
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// ── Cursor blink ────────────────────────────────────────────
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//
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// The cursor sprite on the keyboard pulses at ~2 Hz. Also used
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// by Showing to mark "PRESS B TO RESET".
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var blink_timer: u8 = 0
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