From 9e7d5f6e5e01b7473b84bc3449d7f8e0f78e7045 Mon Sep 17 00:00:00 2001
From: user <user@clank>
Date: Sat, 18 Jul 2026 20:41:27 +0200
Subject: term: 7-color terminal (per-glyph fg+bg) + ANSI escapes; colorize irc

Fano-plane palette scheme: the 7 colors map onto 7 CGB BG palettes so
any color pair shares one palette; a tile's palette is picked from the
set of colors its two cells need (tables generated by tools/gencolor.py).
Per cell a packed (bg<<4)|fg byte lives alongside the char shadow, and
the glyph blitter steers glyph/empty pixels to each cell's fg/bg color
slots via plane masks.

An ANSI-ish CSI parser (ESC [ .. m) drives it; usr/ansi.c demos it and
the irc client now renders hashed nick colors, status dimming and a
channel-activity bar.
---
 include/gbos.inc | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

(limited to 'include/gbos.inc')

diff --git a/include/gbos.inc b/include/gbos.inc
index 246628c..e63d53f 100644
--- a/include/gbos.inc
+++ b/include/gbos.inc
@@ -17,6 +17,28 @@ DEF IEF_TIMER EQU %00000100
 DEF rDIV    EQU $FF04   ; divider register: free-running 8-bit @ 16384 Hz
 DEF rSVBK   EQU $FF70   ; CGB WRAM bank select ($D000-$DFFF): 1..7
 DEF wCurMask EQU $D589  ; term/osk: cursor underline bits OR'd into a tile's last row
+; --- color renderer (term.asm) ---------------------------------------------
+; Per-glyph foreground AND background color. Each pixel of a tile gets a CGB
+; color-id: glyph pixels use the fg color's slot, empty pixels the bg color's
+; slot. The 7 colors form a Fano plane across 7 BG palettes so any pair shares
+; one palette; a tile's palette is chosen from the set of colors it needs
+; (tools/gencolor.py builds PalData/BitTab/BestPal/SlotOf). Per cell we store a
+; packed color byte = (bg<<4)|fg (each 0..7; 0=black/default).
+DEF wFGP0     EQU $D5A2  ; foreground plane-0 mask (glyph pixels -> id bit0)
+DEF wFGP1     EQU $D5A3  ; foreground plane-1 mask (glyph pixels -> id bit1)
+DEF wCurColor EQU $D5A4  ; current packed color (bg<<4)|fg for chars printed next
+DEF wAnsiState EQU $D5A5 ; ANSI parser: 0=normal 1=after-ESC 2=in-CSI
+DEF wAnsiParam EQU $D5A6 ; ANSI parser: accumulating numeric parameter
+DEF wPalAttr  EQU $D5A7  ; chosen palette (bits 0..2) for a tile's tilemap attr
+DEF wTMSlot   EQU $D5A8  ; line-slot stashed by term_write_tilemap's attr pass
+DEF wBGP0     EQU $D5A9  ; background plane-0 mask (empty pixels -> id bit0)
+DEF wBGP1     EQU $D5AA  ; background plane-1 mask (empty pixels -> id bit1)
+DEF wCSL      EQU $D5AB  ; color_setup scratch: left cell packed color
+DEF wCSR      EQU $D5AC  ; color_setup scratch: right cell packed color
+DEF wCSset    EQU $D5AD  ; color_setup scratch: 7-bit set of colors present
+DEF wCSpb     EQU $D5AE  ; color_setup scratch: palette*8 (SlotOf base)
+DEF wCStmp0   EQU $D5AF  ; color_setup scratch: assembled plane-0 mask
+DEF wCStmp1   EQU $D5B0  ; color_setup scratch: assembled plane-1 mask
 DEF OSK_DOCK EQU 3       ; on-screen keyboard height in rows (dock at the bottom)
 DEF rKEY1   EQU $FF4D   ; CGB speed switch
 DEF rSB     EQU $FF01   ; serial data
@@ -265,5 +287,6 @@ DEF PROG_NSLOOKUP EQU 28
 DEF PROG_DHCP   EQU 29
 DEF PROG_IRC    EQU 30
 DEF PROG_UPTIME EQU 31
+DEF PROG_ANSI   EQU 32
 
     ENDC
-- 
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