fix textgpu somehow getting *really* long buffer lines, which broke things sometimes

.gitignore

@@ -8,3 +8,4 @@
 /usereeprom.lua
 /run
 /root*
+/musl-cross-make

include/luares.h

@@ -13,6 +13,7 @@ extern char lua_init[];
 extern char lua_internet[];
 extern char lua_sandbox[];
 extern char lua_textgpu[];
+extern char lua_textgpu_old[];
 extern char lua_util_buffer[];
 extern char lua_util_color[];
 extern char lua_util_random[];

scripts/dependencies.sh

@@ -42,6 +42,10 @@ case "$1" in
     TOOL=powerpc-linux-musl
     OUT=$TOOL
     ;;
+  i686 )
+    TOOL=i686-linux-musl
+    OUT=i686-linux-musl
+    ;;
   *) echo "Invalid target!" ; exit 1
     ;;
 esac
@@ -60,7 +64,7 @@ cd dependencies
 
 if [ $2 = "libressl" ] || [ $# -lt 2 ]; then
 
-  git clone https://github.com/libressl-portable/portable.git libressl
+  git clone --depth 1 https://github.com/libressl-portable/portable.git libressl
   cd libressl
   ./autogen.sh
   CFLAGS="-fdata-sections -ffunction-sections" ./configure --host=$TOOL

src/lua/core/boot.lua

@@ -31,7 +31,7 @@ function boot.boot()
       gpu.setBackground(0x000000)
 
       native.sleep(4000000)
-      os.exit(1)
+      while true do --[[NOTHING]] end
     end)
   end
 

src/lua/core/computer.lua

@@ -62,30 +62,30 @@ local keymap = {
 
   [0x60 + 0x01] = 0x1E,
   [0x60 + 0x02] = 0x30,
-  [0x60 + 0x04] = 0x2E,
-  [0x60 + 0x05] = 0x20,
-  [0x60 + 0x06] = 0x12,
-  [0x60 + 0x07] = 0x21,
-  [0x60 + 0x08] = 0x22,
-  [0x60 + 0x09] = 0x23,
-  [0x60 + 0x0A] = 0x17,
-  [0x60 + 0x0B] = 0x24,
-  [0x60 + 0x0C] = 0x25,
-  [0x60 + 0x0D] = 0x26,
-  [0x60 + 0x0E] = 0x32,
-  [0x60 + 0x0F] = 0x31,
-  [0x60 + 0x11] = 0x18,
-  [0x60 + 0x12] = 0x19,
-  [0x60 + 0x13] = 0x10,
-  [0x60 + 0x14] = 0x13,
-  [0x60 + 0x15] = 0x1F,
-  [0x60 + 0x16] = 0x14,
-  [0x60 + 0x17] = 0x16,
-  [0x60 + 0x18] = 0x2F,
-  [0x60 + 0x19] = 0x11,
-  [0x60 + 0x1A] = 0x2D,
-  [0x60 + 0x1B] = 0x15,
-  [0x60 + 0x1C] = 0x2C,
+  [0x60 + 0x03] = 0x2E,
+  [0x60 + 0x04] = 0x20,
+  [0x60 + 0x05] = 0x12,
+  [0x60 + 0x06] = 0x21,
+  [0x60 + 0x07] = 0x22,
+  [0x60 + 0x08] = 0x23,
+  [0x60 + 0x09] = 0x17,
+  [0x60 + 0x0A] = 0x24,
+  [0x60 + 0x0B] = 0x25,
+  [0x60 + 0x0C] = 0x26,
+  [0x60 + 0x0D] = 0x32,
+  [0x60 + 0x0E] = 0x31,
+  [0x60 + 0x0F] = 0x18,
+  [0x60 + 0x10] = 0x19,
+  [0x60 + 0x11] = 0x10,
+  [0x60 + 0x12] = 0x13,
+  [0x60 + 0x13] = 0x1F,
+  [0x60 + 0x13] = 0x14,
+  [0x60 + 0x14] = 0x16,
+  [0x60 + 0x16] = 0x2F,
+  [0x60 + 0x17] = 0x11,
+  [0x60 + 0x18] = 0x2D,
+  [0x60 + 0x19] = 0x15,
+  [0x60 + 0x1A] = 0x2C,
 
   [13] = 28, --Return key
   [127] = 14, --backspace
@@ -97,24 +97,88 @@ local asciitr = {
   [127] = 8,
 }
 
+local escmap = {
+  [65] = 200, -- up
+  [66] = 208, -- down
+  [67] = 205, -- right
+  [68] = 203, -- left
+}
+
+local inesc_down = false
+local esc_down_ctrl = false
 function computer.signalTransformers.key_down(s, a, ascii, key, user)
   if key ~= -1 then
     return s, a, ascii, key, user
   end
+  if ascii == 27 then
+    inesc_down = native.uptime()
+    return nil
+  elseif ascii < 27 and ascii ~= 8 and ascii ~= 13 and ascii ~= 9 then
+    signalQueue[#signalQueue + 1] = {s, a, 0, 29, user}
+    key = keymap[ascii + 96] or -1
+  elseif inesc_down then
+    if (ascii < 48 or ascii > 57) and ascii ~= 59 and ascii ~= 91 then
+      inesc_down = false
+      key = escmap[ascii] or 0
+      if not esc_down_ctrl then
+        --ascii = math.max(0, ascii - 96)
+      else
+        ascii = 0
+      end
+      esc_down_ctrl = false
+    elseif ascii == 91 then
+      esc_down_ctrl = true
+    elseif native.uptime() - inesc_down > 100 then -- 100ms timeout after {ESC}
+      return nil
+    else
+      esc_down_ctrl = false
+      inesc_down = false
+    end
+  end
   return s, a, math.floor(asciitr[ascii] or ascii), keymap[ascii] or key, user
 end
 
+local inesc_up = false
+local esc_up_ctrl = false
 function computer.signalTransformers.key_up(s, a, ascii, key, user)
   if key ~= -1 then
     return s, a, ascii, key, user
   end
+  if ascii == 27 then
+    inesc_up = native.uptime()
+    return nil
+  elseif ascii < 27 and ascii ~= 8 and ascii ~= 13 and ascii ~= 9 then
+    signalQueue[#signalQueue+1] = {s, a, 0, 29, user}
+    key = keymap[ascii + 96] or 0
+  elseif inesc_up then
+    if (ascii < 48 or ascii > 57) and ascii ~= 59 and ascii ~= 91 then
+      inesc_up = false
+      key = escmap[ascii] or 0
+      if not esc_up_ctrl then
+        --ascii = math.max(0, ascii - 96)
+      else
+        ascii = 0
+      end
+      esc_up_ctrl = false
+    elseif ascii == 91 then
+      esc_up_ctrl = true
+    elseif native.uptime() - inesc_up > 100 then -- 100ms timeout after {ESC}
+      return nil
+    else
+      esc_up_ctrl = false
+      inesc_up = false
+    end
+  end
   return s, a, math.floor(asciitr[ascii] or ascii), keymap[ascii] or key, user
 end
 
 -----
 
 function api.pushSignal(s, ...)
-  signalQueue[#signalQueue + 1] = {computer.signalTransformers[s](s, ...)}
+  local result = table.pack(computer.signalTransformers[s](s, ...))
+  if result.n == 0 or not result[1] then return end
+  result.n = nil
+  signalQueue[#signalQueue + 1] = result
 end
 
 function api.pullSignal(timeout)

src/lua/core/textgpu.lua

@@ -1,257 +1,324 @@
 local textgpu = {}
 
-local mapping = {
-  ["0"] = 0x000000,
-  ["1"] = 0xFF0000,
-  ["2"] = 0x00FF00,
-  ["3"] = 0xFFFF00,
-  ["4"] = 0x0000FF,
-  ["5"] = 0xFF00FF,
-  ["6"] = 0x00FFFF,
-  ["7"] = 0xFFFFFF,
-}
+local mapping = {}
+local palette = {}
 
---[[local nw = io.write
-io.write = function(...)
-  nw(...)
-  io.flush()
-  native.sleep(20000)
-end]]--
+-- generate color mapping
+
+for g=0, 255, 0x24 do
+  for b=0, 256, 0x40 do
+    for r=0, 255, 0x33 do
+      mapping[#mapping+1] = (math.min(r, 255) * 0x10000)
+                          + (math.min(g, 255) * 0x100) + math.min(b, 255)
+    end
+  end
+end
+
+for i=0, 15, 1 do
+  mapping[#mapping+1] = (i+1) * 0x0f0f0f
+  palette[i] = (i+1) * 0x0f0f0f
+end
 
 local write = io.write
 local flush = io.flush
 
-local background = "0"
-local foreground = "0"
+local background = 1
+local foreground = 256
 
 local tbuffer = {}
 local bbuffer = {}
 local fbuffer = {}
 
-local function prepareBuffers(w, h)
-  local tbline = (" "):rep(w)
-  local bbline = ("0"):rep(w)
-  local fbline = ("7"):rep(w)
-  for i=1, h do
-    tbuffer[i] = tbline
-    bbuffer[i] = bbline
-    fbuffer[i] = fbline
+local function prep(w, h)
+  local tl = string.rep(" ", w)
+  local bb = string.rep("\0", w)
+  local fb = string.rep("\255", w)
+
+  for i=1, h, 1 do
+    tbuffer[i] = tl
+    bbuffer[i] = bb
+    fbuffer[i] = fb
   end
 end
 
-local usub
-local function insertString(main, sub, at)
-  checkArg(1, main, "string")
-  checkArg(2, sub, "string")
-  checkArg(3, at, "number")
+local fg = 256
+local bg = 1
+local w, h = 1, 1
 
-  return usub(main, 1, at - 1)
-    .. sub .. usub(main, at + (utf8.len(sub) or 0))
+local function rgb(i)
+  return i>>16&0xFF, i>>8&0xFF, i&0xFF
+end
+
+local unsub, fullRefresh
+local function set(x, y, text, f, b, safe, noref)
+  if x > w or x < 1 or y > h or y < 1 or not tbuffer[y] then
+    if safe then
+      return
+    else
+      error("index out of bounds: " .. y, 3)
+    end
+  end
+  if not text then return end
+  f = f or fg
+  b = b or bg
+  local len = utf8.len(text)
+  if x + len > w then
+    --len = (x + len) - w
+    --text = unsub(text, 1, len)
+  end
+  tbuffer[y] = unsub(tbuffer[y], 1, x - 1) ..
+    text .. unsub(tbuffer[y], x + len)
+  if type(f) == "string" then
+    fbuffer[y] = fbuffer[y]:sub(1, x - 1) ..
+      f .. fbuffer[y]:sub(x + len)
+  else
+    if not noref then
+      local F = mapping[f]
+      local r, g, _b = rgb(F)
+      write("\27[38;2;", r, ";", g, ";", _b, "m")
+    end
+    fbuffer[y] = fbuffer[y]:sub(1, x - 1) ..
+      string.rep(string.char(f - 1), len) .. fbuffer[y]:sub(x + len)
+  end
+  if type(b) == "string" then
+    bbuffer[y] = bbuffer[y]:sub(1, x - 1) ..
+      b .. bbuffer[y]:sub(x + len)
+  else
+    if not noref then
+      local B = mapping[b]
+      local r, g, _b = rgb(B)
+      write("\27[48;2;", r, ";", g, ";", _b, "m")
+    end
+    bbuffer[y] = bbuffer[y]:sub(1, x - 1) ..
+      string.rep(string.char(b - 1), len) .. bbuffer[y]:sub(x + len)
+  end
+  -- clamp buffers
+  tbuffer[y] = unsub(tbuffer[y], 1, w)
+  fbuffer[y] = fbuffer[y]:sub(1, w)
+  bbuffer[y] = bbuffer[y]:sub(1, w)
+  if not noref then
+    write("\27[", y, ";", x, "H", text)
+    flush()
+  end
+end
+
+fullRefresh = function()
+  for i=1, h, 1 do
+    local text = tbuffer[i]
+    local fgt = fbuffer[i]
+    local bgt = bbuffer[i]
+    --native.log("UPDATE " .. i .. ": \"" .. text .. "\"")
+    local pb, pf
+    fgt = fgt:gsub("()(.)", function(n, fc)
+      local bc, tc = bgt:sub(n,n), text:sub(n,n)
+      local str = ""
+      if bc ~= pb then
+        pb = bc
+        local B = mapping[bc:byte() + 1]
+        str = str .. string.format("\27[48;2;%d;%d;%dm",
+          rgb(B))
+      end
+      if fc ~= pf then
+        pf = fc
+        local F = mapping[fc:byte() + 1]
+        str = str .. string.format("\27[38;2;%d;%d;%dm",
+          rgb(F))
+      end
+      str = str .. tc
+      return str
+    end)
+    write("\27[", i, ";1H", fgt)
+  end
+  flush()
+end
+
+local function get(x, y, len, safe)
+  if x < 1 or x > w or y < 1 or y > h then
+    if safe then
+      return
+    else
+      error("index out of bounds: " .. y, 3)
+    end
+  end
+  len = (len or 1) - 1
+  if x + len > w then
+    len = (x + len) - w
+  end
+  local text = unsub(tbuffer[y], x, x + len)
+  if len == 0 then
+    return text,
+      mapping[fbuffer[y]:sub(x, x):byte() + 1],
+      mapping[bbuffer[y]:sub(x, x):byte() + 1]
+  else
+    return text, fbuffer[y]:sub(x, x + len), bbuffer[y]:sub(x, x + len)
+  end
 end
 
 function textgpu.start()
-  usub = modules.sandbox.unicode.sub
-  local _height = 0
+  unsub = modules.sandbox.unicode.sub
   local gpu = {}
-  function gpu.bind() return false, "This is static bound gpu" end
-  function gpu.setBackground(color, isPaletteIndex)
+
+  function gpu.setForeground(color, ispalette)
     checkArg(1, color, "number")
-    checkArg(2, isPaletteIndex, "boolean", "nil")
-    if isPaletteIndex then
-      return --TODO: Maybe?
+    checkArg(2, ispalette, "boolean", "nil")
+    local ret = color
+    if ispalette then
+      if not palette[color] then
+        error("invalid palette index", 2)
       end
-    local old = background
-    background = tostring(math.floor(modules.color.nearest(color, mapping)))
-    write("\x1b[4" .. background .. "m")
-    flush()
-    return mapping[old]
+      color = palette[color]
     end
-  function gpu.setForeground(color, isPaletteIndex)
+    local index = math.floor(modules.color.nearest(color, mapping))
+    fg = index or fg
+    return ret, ispalette
+  end
+
+  function gpu.setBackground(color, ispalette)
     checkArg(1, color, "number")
-    checkArg(2, isPaletteIndex, "boolean", "nil")
-    if isPaletteIndex then
-      return --TODO: Maybe?
+    checkArg(2, ispalette, "boolean", "nil")
+    local ret = color
+    if ispalette then
+      if not palette[color] then
+        error("invalid palette index", 2)
       end
-    local old = foreground
-    foreground = tostring(math.floor(modules.color.nearest(color, mapping)))
-    write("\x1b[3" .. foreground .. "m")
-    flush()
-    return mapping[old]
+      color = palette[color]
     end
-  function gpu.getBackground()
-    return mapping[background], false
+    local index = math.floor(modules.color.nearest(color, mapping))
+    bg = index or bg
+    return ret, ispalette
   end
+
+  function gpu.setPaletteColor(c, v)
+    checkArg(1, c, "number")
+    checkArg(2, v, "number")
+    if not palette[c] then
+      error("invalid palette index", 2)
+    end
+    palette[c] = v
+  end
+
+  function gpu.getPaletteColor(c)
+    checkArg(1, c, "number")
+    if not palette[c] then
+      error("invalid palette index", 2)
+    end
+    return palette[c]
+  end
+
   function gpu.getForeground()
-    return mapping[foreground], false
+    return mapping[fg]
   end
-  function gpu.getPaletteColor()
-    return nil
-  end
-  function gpu.setPaletteColor()
-    return nil
-  end
-  function gpu.maxDepth()
-    return 3
-  end
-  function gpu.setDepth()
-    return false
+
+  function gpu.getBackground()
+    return mapping[bg]
   end
+
   function gpu.getDepth()
-    return 3
+    return 4
   end
-  function gpu.maxResolution()
-    return termutils.getSize()
+  
+  function gpu.maxDepth()
+    return 4
   end
+
+  function gpu.setDepth()
+    return true
+  end
+
   function gpu.getResolution()
     return termutils.getSize()
   end
-  function gpu.getViewport()
-    return termutils.getSize()
+
+  function gpu.setResolution()
+    return false
   end
-  function gpu.setViewport(w, h)
-    checkArg(1, w, "number")
-    checkArg(2, h, "number")
-    return false, "Viewport not supported for this gpu"
+
+  gpu.maxResolution = gpu.getResolution
+  gpu.getViewport = gpu.getResolution
+  gpu.setViewport = gpu.setResolution
+
+  function gpu.set(x, y, text, vert)
+    checkArg(1, x, "number")
+    checkArg(2, y, "number")
+    checkArg(3, text, "string")
+    checkArg(4, vert, "boolean", "nil")
+    vert = false
+    if vert then
+      local i = 1
+      local len = utf8.len(text)
+      while i <= len do
+        set(x, y + i - 1, unsub(text, i, i))
+        i = i + 1
       end
-  function gpu.setResolution(w, h)
-    checkArg(1, w, "number")
-    checkArg(2, h, "number")
-    return false, "Non resizeable gpu"
+      return true
+    else
+      set(x, y, text)
+      return true
     end
+  end
+
   function gpu.get(x, y)
     checkArg(1, x, "number")
     checkArg(2, y, "number")
+    return get(x, y)
+  end
 
-    return tbuffer[y]:sub(x,x), mapping[fbuffer[y]:sub(x,x)], mapping[bbuffer[y]:sub(x,x)]
-  end
-  function gpu.set(x, y, value, vertical)
+  function gpu.fill(x, y, W, H, c)
     checkArg(1, x, "number")
-    checkArg(2, y, "number")
-    checkArg(3, value, "string")
-    checkArg(4, vertical, "boolean", "nil")
-    x = math.floor(x)
-    y = math.floor(y)
-    if not vertical then
-      if not tbuffer[y] then
-        native.log("GPU Set failed: under buffer")
-        return false
+    checkArg(1, y, "number")
+    checkArg(1, W, "number")
+    checkArg(1, H, "number")
+    checkArg(1, c, "string")
+    c = unsub(c, 1, 1)
+    if #c == 0 then return true end
+    local str = c:rep(W)
+    for i=1, H, 1 do
+      set(x, y + i - 1, str, nil, nil, true)
     end
-      tbuffer[y] = insertString(tbuffer[y], value, x)
-      bbuffer[y] = insertString(bbuffer[y], background:rep(utf8.len(value)), x)
-      fbuffer[y] = insertString(fbuffer[y], foreground:rep(utf8.len(value)), x)
-      write("\x1b[" .. y .. ";" .. x .. "H" .. value)
-    else
-      --TODO: Buffers!
-      write("\x1b[" .. y .. ";" .. x .. "H")
-      value:gsub("([%z\1-\127\194-\244][\128-\191]*)", function(c)
-        write(c .. "\x1b[D\x1b[B")
-      end)
-    end
-    flush()
     return true
   end
-  function gpu.copy(x, y, w, h, tx, ty) --TODO: Check(check X multiple times)
+
+  function gpu.copy(x, y, W, H, xd, yd)
     checkArg(1, x, "number")
     checkArg(2, y, "number")
-    checkArg(3, w, "number")
-    checkArg(4, h, "number")
-    checkArg(5, tx, "number")
-    checkArg(6, ty, "number")
-    local ttbuf = {}
-    local btbuf = {}
-    local ftbuf = {}
-    for i=1, h do
-      if i + y - 2 <= _height and i + y > 1 then
-        ttbuf[i] = tbuffer[y + i - 1] and usub(tbuffer[y + i - 1], x, x + w - 1) or (" "):rep(w)
-        btbuf[i] = bbuffer[y + i - 1] and bbuffer[y + i - 1]:sub(x, x + w - 1) or background:rep(w)
-        ftbuf[i] = fbuffer[y + i - 1] and fbuffer[y + i - 1]:sub(x, x + w - 1) or foreground:rep(w)
-      else
-        ttbuf[i] = (" "):rep(w)
-        btbuf[i] = background:rep(w)
-        ftbuf[i] = foreground:rep(w)
-      end
-    end
-    local bg = background
-    local fg = foreground
-
-    for i=1, h do
-      local line, linex
-      local lwrite = false
-      for j=1, w do
-        if btbuf[i]:sub(j,j) ~= bg then
-          lwrite = true
-        end
-        if ftbuf[i]:sub(j,j) ~= fg then
-          lwrite = true
-        end
-        if not line then linex = j end
-        line = (line or "")
-        if lwrite then
-          local wx = (tx + x + linex - 1)|0
-          local wy = (ty + y + i - 1)|0
-          if tbuffer[wy] then
-            write("\x1b[4" .. bg .. "m\x1b[3" .. fg .. "m\x1b[" .. wy .. ";" .. wx .. "H" .. line)
-            tbuffer[wy] = insertString(tbuffer[wy], line, wx)
-            bbuffer[wy] = insertString(bbuffer[wy], bg:rep(utf8.len(line)), wx)
-            fbuffer[wy] = insertString(fbuffer[wy], fg:rep(utf8.len(line)), wx)
-          end
-        
-          bg = btbuf[i]:sub(j,j)
-          fg = ftbuf[i]:sub(j,j)
-          line = nil
-          linex = nil
-          lwrite = false
-        end
-        if not line then linex = j end
-        line = (line or "") .. usub(ttbuf[i], j,j)
-      end
-      if line then
-        local wx = (tx + x + linex - 1)|0
-        local wy = (ty + y + i - 1)|0
-        if tbuffer[wy] then
-          write("\x1b[4" .. bg .. "m\x1b[3" .. fg .. "m\x1b[" .. wy .. ";" .. wx .. "H" .. line)
-          tbuffer[wy] = insertString(tbuffer[wy], line, wx)
-          bbuffer[wy] = insertString(bbuffer[wy], bg:rep(utf8.len(line)), wx)
-          fbuffer[wy] = insertString(fbuffer[wy], fg:rep(utf8.len(line)), wx)
-        end
-        line = nil
-        linex = nil
-        lwrite = false
-      end
-    end
-    write("\x1b[4" .. background .. "m")
-    write("\x1b[3" .. foreground .. "m")
-    flush()
-    return true
-  end
-  function gpu.fill(x, y, w, h, ch)
-    checkArg(1, x, "number")
-    checkArg(2, y, "number")
-    checkArg(3, w, "number")
-    checkArg(4, h, "number")
-    checkArg(5, ch, "string")
-    ch = usub(ch, 1, 1):rep(math.floor(w))
-    for i=1, h do
-      if i + y - 1 <= _height and i + y > 1 then
-        gpu.set(x, y + i - 1, ch)
+    checkArg(3, W, "number")
+    checkArg(4, H, "number")
+    checkArg(5, xd, "number")
+    checkArg(6, yd, "number")
+    if xd == 0 and yd == 0 then return true end -- hah
+    local start, stop, step
+    if yd < 0 then -- moving up - copy from the top down
+      start, stop, step = y, y + H, 1
+    else -- moving down - copy from the bottom up
+      start, stop, step = y + H, y, -1
+    end
+    for i=start, stop, step do
+      local str, fstr, bstr = get(x, i, W, true)
+      --native.log("COPY " .. i .. " (" .. (str or "") .. ") to " .. (i + yd))
+      if str then-- and fstr and bstr then
+        set(x + xd, i + yd, str, fstr, bstr, true, true)
       end
     end
+    fullRefresh()
     return true
   end
 
   local screenAddr
-
   function gpu.getScreen()
     return screenAddr
   end
 
+  function gpu.bind() --[[STUB]] end
+
   if not termutils.init() then
     return nil, "Cannot initialize terminal based gpu"
   end
   write("\x1b[?25l") --Disable cursor
-  local w, h = gpu.getResolution()
-  _height = h
-  prepareBuffers(w, h)
+
+  w, h = gpu.getResolution()
+  prep(w, h)
+  fullRefresh()
+
   gpu.setForeground(0xFFFFFF)
   gpu.setBackground(0x000000)
 

src/lua/core/textgpu_old.lua

@@ -0,0 +1,271 @@
+local textgpu = {}
+
+local mapping = {
+  ["0"] = 0x000000,
+  ["1"] = 0xFF0000,
+  ["2"] = 0x00FF00,
+  ["3"] = 0xFFFF00,
+  ["4"] = 0x0000FF,
+  ["5"] = 0xFF00FF,
+  ["6"] = 0x00FFFF,
+  ["7"] = 0xFFFFFF,
+}
+
+--[[local nw = io.write
+io.write = function(...)
+  nw(...)
+  io.flush()
+  native.sleep(20000)
+end]]--
+
+local write = io.write
+local flush = io.flush
+
+local background = "0"
+local foreground = "0"
+
+local tbuffer = {}
+local bbuffer = {}
+local fbuffer = {}
+
+local function prepareBuffers(w, h)
+  local tbline = (" "):rep(w)
+  local bbline = ("0"):rep(w)
+  local fbline = ("7"):rep(w)
+  for i=1, h do
+    tbuffer[i] = tbline
+    bbuffer[i] = bbline
+    fbuffer[i] = fbline
+  end
+end
+
+local usub
+local function insertString(main, sub, at)
+  checkArg(1, main, "string")
+  checkArg(2, sub, "string")
+  checkArg(3, at, "number")
+
+  return usub(main, 1, at - 1)
+    .. sub .. usub(main, at + (utf8.len(sub) or 0))
+end
+
+function textgpu.start()
+  usub = modules.sandbox.unicode.sub
+  local _height = 0
+  local gpu = {}
+  function gpu.bind() return false, "This is static bound gpu" end
+  function gpu.setBackground(color, isPaletteIndex)
+    checkArg(1, color, "number")
+    checkArg(2, isPaletteIndex, "boolean", "nil")
+    if isPaletteIndex then
+      return --TODO: Maybe?
+    end
+    local old = background
+    background = tostring(math.floor(modules.color.nearest(color, mapping)))
+    write("\x1b[4" .. background .. "m")
+    flush()
+    return mapping[old]
+  end
+  function gpu.setForeground(color, isPaletteIndex)
+    checkArg(1, color, "number")
+    checkArg(2, isPaletteIndex, "boolean", "nil")
+    if isPaletteIndex then
+      return --TODO: Maybe?
+    end
+    local old = foreground
+    foreground = tostring(math.floor(modules.color.nearest(color, mapping)))
+    write("\x1b[3" .. foreground .. "m")
+    flush()
+    return mapping[old]
+  end
+  function gpu.getBackground()
+    return mapping[background], false
+  end
+  function gpu.getForeground()
+    return mapping[foreground], false
+  end
+  function gpu.getPaletteColor()
+    return nil
+  end
+  function gpu.setPaletteColor()
+    return nil
+  end
+  function gpu.maxDepth()
+    return 3
+  end
+  function gpu.setDepth()
+    return false
+  end
+  function gpu.getDepth()
+    return 3
+  end
+  function gpu.maxResolution()
+    return termutils.getSize()
+  end
+  function gpu.getResolution()
+    return termutils.getSize()
+  end
+  function gpu.getViewport()
+    return termutils.getSize()
+  end
+  function gpu.setViewport(w, h)
+    checkArg(1, w, "number")
+    checkArg(2, h, "number")
+    return false, "Viewport not supported for this gpu"
+  end
+  function gpu.setResolution(w, h)
+    checkArg(1, w, "number")
+    checkArg(2, h, "number")
+    return false, "Non resizeable gpu"
+  end
+  function gpu.get(x, y)
+    checkArg(1, x, "number")
+    checkArg(2, y, "number")
+    
+    return tbuffer[y]:sub(x,x), mapping[fbuffer[y]:sub(x,x)], mapping[bbuffer[y]:sub(x,x)]
+  end
+  function gpu.set(x, y, value, vertical)
+    checkArg(1, x, "number")
+    checkArg(2, y, "number")
+    checkArg(3, value, "string")
+    checkArg(4, vertical, "boolean", "nil")
+    x = math.floor(x)
+    y = math.floor(y)
+    if not vertical then
+      if not tbuffer[y] then
+        native.log("GPU Set failed: under buffer")
+        return false
+      end
+      tbuffer[y] = insertString(tbuffer[y], value, x)
+      bbuffer[y] = insertString(bbuffer[y], background:rep(utf8.len(value)), x)
+      fbuffer[y] = insertString(fbuffer[y], foreground:rep(utf8.len(value)), x)
+      write("\x1b[" .. y .. ";" .. x .. "H" .. value)
+    else
+      --TODO: Buffers!
+      write("\x1b[" .. y .. ";" .. x .. "H")
+      value:gsub("([%z\1-\127\194-\244][\128-\191]*)", function(c)
+        write(c .. "\x1b[D\x1b[B")
+      end)
+    end
+    flush()
+    return true
+  end
+  function gpu.copy(x, y, w, h, tx, ty) --TODO: Check(check X multiple times)
+    checkArg(1, x, "number")
+    checkArg(2, y, "number")
+    checkArg(3, w, "number")
+    checkArg(4, h, "number")
+    checkArg(5, tx, "number")
+    checkArg(6, ty, "number")
+    local ttbuf = {}
+    local btbuf = {}
+    local ftbuf = {}
+    for i=1, h do
+      if i + y - 2 <= _height and i + y > 1 then
+        ttbuf[i] = tbuffer[y + i - 1] and usub(tbuffer[y + i - 1], x, x + w - 1) or (" "):rep(w)
+        btbuf[i] = bbuffer[y + i - 1] and bbuffer[y + i - 1]:sub(x, x + w - 1) or background:rep(w)
+        ftbuf[i] = fbuffer[y + i - 1] and fbuffer[y + i - 1]:sub(x, x + w - 1) or foreground:rep(w)
+      else
+        ttbuf[i] = (" "):rep(w)
+        btbuf[i] = background:rep(w)
+        ftbuf[i] = foreground:rep(w)
+      end
+    end
+    local bg = background
+    local fg = foreground
+
+    for i=1, h do
+      local line, linex
+      local lwrite = false
+      for j=1, w do
+        if btbuf[i]:sub(j,j) ~= bg then
+          lwrite = true
+        end
+        if ftbuf[i]:sub(j,j) ~= fg then
+          lwrite = true
+        end
+        if not line then linex = j end
+        line = (line or "")
+        if lwrite then
+          local wx = (tx + x + linex - 1)|0
+          local wy = (ty + y + i - 1)|0
+          if tbuffer[wy] then
+            write("\x1b[4" .. bg .. "m\x1b[3" .. fg .. "m\x1b[" .. wy .. ";" .. wx .. "H" .. line)
+            tbuffer[wy] = insertString(tbuffer[wy], line, wx)
+            bbuffer[wy] = insertString(bbuffer[wy], bg:rep(utf8.len(line)), wx)
+            fbuffer[wy] = insertString(fbuffer[wy], fg:rep(utf8.len(line)), wx)
+          end
+        
+          bg = btbuf[i]:sub(j,j)
+          fg = ftbuf[i]:sub(j,j)
+          line = nil
+          linex = nil
+          lwrite = false
+        end
+        if not line then linex = j end
+        line = (line or "") .. usub(ttbuf[i], j,j)
+      end
+      if line then
+        local wx = (tx + x + linex - 1)|0
+        local wy = (ty + y + i - 1)|0
+        if tbuffer[wy] then
+          write("\x1b[4" .. bg .. "m\x1b[3" .. fg .. "m\x1b[" .. wy .. ";" .. wx .. "H" .. line)
+          tbuffer[wy] = insertString(tbuffer[wy], line, wx)
+          bbuffer[wy] = insertString(bbuffer[wy], bg:rep(utf8.len(line)), wx)
+          fbuffer[wy] = insertString(fbuffer[wy], fg:rep(utf8.len(line)), wx)
+        end
+        line = nil
+        linex = nil
+        lwrite = false
+      end
+    end
+    write("\x1b[4" .. background .. "m")
+    write("\x1b[3" .. foreground .. "m")
+    flush()
+    return true
+  end
+  function gpu.fill(x, y, w, h, ch)
+    checkArg(1, x, "number")
+    checkArg(2, y, "number")
+    checkArg(3, w, "number")
+    checkArg(4, h, "number")
+    checkArg(5, ch, "string")
+    ch = usub(ch, 1, 1):rep(math.floor(w))
+    for i=1, h do
+      if i + y - 1 <= _height and i + y > 1 then
+        gpu.set(x, y + i - 1, ch)
+      end
+    end
+    return true
+  end
+
+  local screenAddr
+
+  function gpu.getScreen()
+    return screenAddr
+  end
+
+  if not termutils.init() then
+    return nil, "Cannot initialize terminal based gpu"
+  end
+  write("\x1b[?25l") --Disable cursor
+  local w, h = gpu.getResolution()
+  _height = h
+  prepareBuffers(w, h)
+  gpu.setForeground(0xFFFFFF)
+  gpu.setBackground(0x000000)
+
+  local gpuaddr = modules.component.api.register(nil, "gpu", gpu)
+  screenAddr = modules.component.api.register(nil, "screen", {getKeyboards = function() return {"TODO:SetThisUuid"} end}) --verry dummy screen, TODO: make it better, kbd uuid also in epoll.c
+  modules.component.api.register("TODO:SetThisUuid", "keyboard", {})
+
+  deadhooks[#deadhooks + 1] = function()
+    write("\x1b[?25h\x1b[" .. ((h-1)|0) .. ";1H") --Enable cursor on quit
+    io.flush()
+    termutils.restore()
+  end
+
+  return gpuaddr
+end
+
+return textgpu