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| author | user <user@clank> | 2026-07-16 16:07:01 +0200 |
|---|---|---|
| committer | user <user@clank> | 2026-07-16 16:07:01 +0200 |
| commit | a5557c75767f7201d5df8c6f95c162044072ef10 (patch) | |
| tree | ed4ddd29ba3e6411b1b20f41fcbf8f67c023c93e /src/term.asm | |
| parent | syscall: mirror console output to the LCD terminal (diff) | |
| download | gbos-a5557c75767f7201d5df8c6f95c162044072ef10.tar.gz gbos-a5557c75767f7201d5df8c6f95c162044072ef10.tar.xz gbos-a5557c75767f7201d5df8c6f95c162044072ef10.zip | |
osk: toggle-able on-screen keyboard on the window layer
A joypad-driven keyboard that costs zero permanent screen space: it lives
on the GB window layer, so SELECT just flips LCDC bit 5 (window enable) and
the terminal's background layer underneath is never disturbed.
- src/joypad.asm: read $FF00 with edge detection (wPadCur/Prev/New).
- src/osk.asm: 3x20 key grid (letters, digits, space, punctuation, plus
Enter/Backspace) built once into spare bank-1 VRAM tiles (104+) and laid
out on the $9C00 window map, docked to the bottom 3 rows. The highlighted
key is a palette swap on its window attribute byte (CGB BG palette 1 =
inverted), so moving the cursor is 1-2 attribute writes with no tile
rebuilding. SELECT toggles, d-pad moves, A types.
- KGetc's console poll loop now polls the joypad and osk_handle each
iteration; a key press returns its byte to the reader exactly like a
serial byte, so the shell is oblivious to the input source.
Verified in the emulator (via --keys): SELECT shows the keyboard, the
highlight tracks the d-pad, and typing "ls"+Enter runs the command and
lists the files; a second SELECT hides it and reclaims the full 18 rows.
Known limitation: the OSK overlays the bottom 3 terminal rows, so if the
prompt has scrolled to the very bottom the current input line can be
hidden. A follow-up can add a scroll region (terminal uses rows 0-14 while
the OSK is up). Input over serial still works unchanged.
Diffstat (limited to 'src/term.asm')
| -rw-r--r-- | src/term.asm | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/src/term.asm b/src/term.asm index 10cdccc..ba9ff93 100644 --- a/src/term.asm +++ b/src/term.asm @@ -31,7 +31,6 @@ DEF wVram EQU $D584 ; 2 DEF wCurRow EQU $D586 ; cursor screen row 0..17 DEF wCurCol EQU $D587 ; cursor screen col 0..39 DEF wCursorOn EQU $D588 ; draw the cursor? -DEF wCurMask EQU $D589 ; underline bits to OR into a tile's last row DEF wRT_sr EQU $D58A ; render_tile scratch DEF wRT_tcol EQU $D58B DEF wRT_cL EQU $D58C @@ -230,7 +229,7 @@ glyph_ptr: ; build_tile - build tile for tile-position DE (E=index, D=bank) from chars ; B (left) and C (right). ORs wCurMask into the last pixel row (cursor). ; ----------------------------------------------------------------------------- -build_tile: +build_tile:: ld a, d ld [rVBK], a ; VRAM bank for this tile ld h, 0 |