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const FONT_WIDTH = 8 # glyph width in pixels
const FONT_HEIGHT = 16 # glyph height in pixels (8x16 vga bitmap font)
const FG_COLOR = 0xd0d0d0
const BG_COLOR = 0x101018
const CURSOR_COLOR = 0x50fa7b
global wd = { path = "/" }
global prompt = fn() "revel:#{wd.path}$ "
# runtime font bs
fn embolden(byte, row) do return (byte bor (byte shl 1)) band 0xFF end
fn slant(byte, row) do return (byte shl ((FONT_HEIGHT - 1 - row) shr 2)) band 0xFF end
fn remap_glyphs(transform) do
let out = {}
for glyph_index in 0..FONT:len() do
const glyph = FONT[glyph_index]
let rows = {}
for row_index in 0..FONT_HEIGHT do rows:push(transform(glyph[row_index], row_index)) end
out:push(rows)
end
return out
end
global reverse8 = fn(byte) do
let out = 0
for bit in 0..8 do
if (byte shr bit) band 1 == 1 do out = out bor (1 shl (7 - bit)) end
end
return out
end
global fonts = {}
global add_font = fn(name, glyphs, width, height, kind, path, size) do
for index in 0..fonts:len() do
if fonts[index].name == name do
fonts[index].glyphs = glyphs
fonts[index].width = width
fonts[index].height = height
fonts[index].kind = kind
fonts[index].path = path
fonts[index].size = size
return :nil
end
end
fonts:push({ name = name, glyphs = glyphs, width = width, height = height, kind = kind, path = path, size = size })
end
global find_font = fn(name) do
for index in 0..fonts:len() do
if fonts[index].name == name return fonts[index]
end
return :nil
end
add_font("vga", FONT, FONT_WIDTH, FONT_HEIGHT, :bitmap, :nil, 0)
add_font("bold", remap_glyphs(embolden), FONT_WIDTH, FONT_HEIGHT, :bitmap, :nil, 0)
add_font("italic", remap_glyphs(slant), FONT_WIDTH, FONT_HEIGHT, :bitmap, :nil, 0)
add_font("bolditalic", remap_glyphs(fn(byte, row) do return slant(embolden(byte, row), row) end), FONT_WIDTH, FONT_HEIGHT, :bitmap, :nil, 0)
global console = {
column = 0, row = 0, scale = 1, shown = :false, cursor_x = 0, cursor_y = 0, blink = 0, font = FONT, font_width = FONT_WIDTH, font_height = FONT_HEIGHT, font_entry = find_font("vga"),
# this is now font dependent
cell_width = fn(self) self.font_width * self.scale,
cell_height = fn(self) self.font_height * self.scale,
columns = fn(self) fb_width() / self:cell_width(),
rows = fn(self) fb_height() / self:cell_height(),
set_font = fn(self, entry) do
self.font = entry.glyphs
self.font_width = entry.width
self.font_height = entry.height
self.font_entry = entry
# a ttf renders at its true pixel size so we js bitmap zoom scale
if entry.kind == :ttf do self.scale = 1 end
self:clear()
end,
draw_glyph = fn(self, column, row, character) do
const origin_x = column * self:cell_width()
const origin_y = row * self:cell_height()
fill_rect(origin_x, origin_y, self:cell_width(), self:cell_height(), BG_COLOR) # clear the cell
const code = character:ascii()
if code < 32 return :nil
if code > 127 return :nil
const glyph = self.font[code - 32]
for glyph_row in 0..self.font_height do
const bits = glyph[glyph_row]
for glyph_col in 0..self.font_width do
if (bits shr glyph_col) band 1 == 1 fill_rect(origin_x + glyph_col * self.scale, origin_y + glyph_row * self.scale, self.scale, self.scale, FG_COLOR)
end
end
end,
newline = fn(self) do
self.column = 0
self.row += 1
if self.row >= self:rows() do
fb_scroll(self:cell_height(), BG_COLOR)
self.row = self:rows() - 1
end
end,
# we dont do shift/cntrl, thats a job for future me lmao
# NOTE: future me kinda delt with it, i was mad drunk
putc = fn(self, character) do
const code = character:ascii()
if code == 10 do self:newline() return :nil end # \n
if code == 13 do self.column = 0 return :nil end # \r
if code == 8 do # backspace: move left
if self.column > 0 self.column -= 1
return :nil
end
if code < 32 return :nil
self:draw_glyph(self.column, self.row, character)
self.column += 1
if self.column >= self:columns() self:newline()
end,
clear = fn(self) do
fill_rect(0, 0, fb_width(), fb_height(), BG_COLOR)
self.column = 0
self.row = 0
end,
cursor_clear = fn(self) do
if self.shown do
fill_rect(self.cursor_x * self:cell_width(), self.cursor_y * self:cell_height(), self:cell_width(), self:cell_height(), BG_COLOR)
self.shown = :false
end
end,
cursor_show = fn(self) do
self.cursor_x = self.column
self.cursor_y = self.row
fill_rect(self.cursor_x * self:cell_width(), self.cursor_y * self:cell_height(), self:cell_width(), self:cell_height(), CURSOR_COLOR)
self.shown = :true
end,
# render every byte the serial mirror has buffered
drain = fn(self) do
let byte = serial_next()
while byte >= 0 do self:putc(string.of_ascii(byte)) byte = serial_next() end
end,
}
global puts = fn(text) serial_puts(text)
global flush_console = fn() do
console:cursor_clear()
console:drain()
console.blink = 0
console:cursor_show()
end
global on_tick = fn(ticks) do
let byte = serial_next()
if byte >= 0 do
console:cursor_clear()
console:putc(string.of_ascii(byte))
console:drain()
console.blink = 0
console:cursor_show()
return :nil
end
if proc_exited() do
console:cursor_clear()
puts(prompt())
console:drain()
console.blink = 0
console:cursor_show()
return :nil
end
console.blink += 1
if console.blink >= 50 do
console.blink = 0
if console.shown console:cursor_clear() else console:cursor_show()
end
end
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