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#!/usr/bin/env python3
# Generate a 4x8 font (3x5 glyphs, left-aligned in a 4px cell) as RGBDS asm.
# Output: 96 glyphs (ASCII 32..127), 8 bytes each; each byte = one 4-px row,
# bit3=leftmost pixel of the cell, bits 3..1 = the 3px glyph, bit0 = gap.
G = {}
def d(ch, rows): # rows: 5 strings of width 3 ('#'/' ')
G[ch] = rows
# space
d(' ', [" "," "," "," "," "])
# letters (uppercase; lowercase mapped to these)
d('A',["## ","# #","###","# #","# #"])
d('B',["## ","# #","## ","# #","## "])
d('C',[" ##","# ","# ","# "," ##"])
d('D',["## ","# #","# #","# #","## "])
d('E',["###","# ","## ","# ","###"])
d('F',["###","# ","## ","# ","# "])
d('G',[" ##","# ","# #","# #"," ##"])
d('H',["# #","# #","###","# #","# #"])
d('I',["###"," # "," # "," # ","###"])
d('J',[" #"," #"," #","# #"," # "])
d('K',["# #","# #","## ","# #","# #"])
d('L',["# ","# ","# ","# ","###"])
d('M',["# #","###","###","# #","# #"])
d('N',["# #","###","###","###","# #"])
d('O',[" # ","# #","# #","# #"," # "])
d('P',["## ","# #","## ","# ","# "])
d('Q',[" # ","# #","# #"," # "," #"])
d('R',["## ","# #","## ","# #","# #"])
d('S',[" ##","# "," # "," #","## "])
d('T',["###"," # "," # "," # "," # "])
d('U',["# #","# #","# #","# #"," ##"])
d('V',["# #","# #","# #"," # "," # "])
d('W',["# #","# #","###","###","# #"])
d('X',["# #","# #"," # ","# #","# #"])
d('Y',["# #","# #"," # "," # "," # "])
d('Z',["###"," #"," # ","# ","###"])
# digits
d('0',[" # ","# #","# #","# #"," # "])
d('1',[" # ","## "," # "," # ","###"])
d('2',["## "," #"," # ","# ","###"])
d('3',["## "," #"," # "," #","## "])
d('4',["# #","# #","###"," #"," #"])
d('5',["###","# ","## "," #","## "])
d('6',[" ##","# ","## ","# #"," # "])
d('7',["###"," #"," # "," # "," # "])
d('8',[" # ","# #"," # ","# #"," # "])
d('9',[" # ","# #"," ##"," #","## "])
# punctuation
d('.',[" "," "," "," "," # "])
d(',',[" "," "," "," # ","# "])
d(':',[" "," # "," "," # "," "])
d(';',[" "," # "," "," # ","# "])
d('!',[" # "," # "," # "," "," # "])
d('?',["## "," #"," # "," "," # "])
d('-',[" "," ","###"," "," "])
d('+',[" "," # ","###"," # "," "])
d('=',[" ","###"," ","###"," "])
d('*',["# #"," # ","###"," # ","# #"])
d('/',[" #"," #"," # ","# ","# "])
d('\\',["# ","# "," # "," #"," #"])
d('(',[" #"," # "," # "," # "," #"])
d(')',["# "," # "," # "," # ","# "])
d('[',["## ","# ","# ","# ","## "])
d(']',[" ##"," #"," #"," #"," ##"])
d('<',[" #"," # ","# "," # "," #"])
d('>',["# "," # "," #"," # ","# "])
d('#',["# #","###","# #","###","# #"])
d('$',[" # "," ##","## "," ##","## "]) # rough
d('%',["# #"," #"," # ","# ","# #"])
d('&',[" # ","# #"," # ","# #"," ##"])
d("'",[" # "," # "," "," "," "])
d('"',["# #","# #"," "," "," "])
d('@',[" # ","# #","###","# "," ##"])
d('_',[" "," "," "," ","###"])
d('~',[" "," ##","## "," "," "])
d('^',[" # ","# #"," "," "," "])
d('|',[" # "," # "," # "," # "," # "])
d('{',[" #"," # ","## "," # "," #"])
d('}',["# "," # "," ##"," # ","# "])
d('`',["# "," # "," "," "," "])
def glyph_bytes(rows):
out=[]
# 5 glyph rows in the top; cell is 4px wide, glyph 3px left-aligned (bit3..1)
for r in range(8):
if r < 5:
s = rows[r]
v = 0
for i,px in enumerate(s): # i=0 leftmost -> bit3
if px=='#': v |= (1 << (3-i))
out.append(v)
else:
out.append(0)
return out
lines=["; auto-generated by tools/genfont.py - 4x8 font (3x5 glyphs), 96 glyphs",
"SECTION \"font\", ROM0", "FontData::"]
for code in range(32,128):
ch = chr(code)
key = ch.upper() if ch.isalpha() else ch
rows = G.get(key, G.get(ch, ["###","# #","# #","# #","###"])) # box for unknown
b = glyph_bytes(rows)
lines.append(" db " + ",".join("$%02X"%x for x in b) + " ; '%s'"%(ch if ch!='\\' and code!=127 else '?'))
open("/home/user/dev/gbos/src/font.asm","w").write("\n".join(lines)+"\n")
print("wrote src/font.inc:", (128-32), "glyphs")
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