From 8e9dd958eb567f7a493f7fde0475f98e00de33b9 Mon Sep 17 00:00:00 2001
From: hkc <hatkidchan@gmail.com>
Date: Tue, 10 Sep 2024 18:52:33 +0300
Subject: [PATCH] Added checkbox.ing viewer

---
 obcb-cc.lua | 99 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 obcb-cc.lua

diff --git a/obcb-cc.lua b/obcb-cc.lua
new file mode 100644
index 0000000..c1ed44e
--- /dev/null
+++ b/obcb-cc.lua
@@ -0,0 +1,99 @@
+
+local ws = assert(http.websocket("wss://bitmap-ws.alula.me/"))
+
+function parse_u16(data)
+    local v = table.remove(data, 1)
+    v = bit.bor(v, bit.blshift(table.remove(data, 1), 8))
+    return v, data
+end
+
+function parse_u32(data)
+    local v = table.remove(data, 1)
+    v = bit.bor(v, bit.blshift(table.remove(data, 1), 8))
+    v = bit.bor(v, bit.blshift(table.remove(data, 1), 16))
+    v = bit.bor(v, bit.blshift(table.remove(data, 1), 24))
+    return v, data
+end
+
+local chunk_id = 421
+local chunk_state = { 0x48, 0x65, 0x6c, 0x6c, 0x6f }
+
+local function send_chunk_request(chunk)
+    ws.send(string.char(0x10, bit.band(chunk, 0xFF), bit.band(bit.brshift(chunk, 8), 0xFF)), true)
+end
+
+local function send_chunk_subscribe_request(chunk)
+    ws.send(string.char(0x14, bit.band(chunk, 0xFF), bit.band(bit.brshift(chunk, 8), 0xFF)), true)
+end
+
+parallel.waitForAll(function()
+    while true do
+        local data, is_binary = ws.receive()
+        data = { string.byte(data, 1, #data) }
+        local opcode = table.remove(data, 1)
+        if opcode == 0x00 then -- hello
+            ver_major, data = parse_u16(data)
+            ver_minor, data = parse_u16(data)
+            os.queueEvent("obcb:hello", ver_major, ver_minor)
+        elseif opcode == 0x01 then
+            local clients = parse_u32(data)
+            -- TODO: show them somewhere
+            os.queueEvent("obcb:clients", clients)
+        elseif opcode == 0x11 then
+            chunk_index, data = parse_u16(data)
+            if chunk_index == chunk_id then
+                chunk_state = data
+            end
+            os.queueEvent("obcb:update")
+        elseif opcode == 0x12 then
+            offset, chunk = parse_u32(data)
+            local c_id = math.floor(offset / 32768)
+            local b_off = offset % 32768
+            for i = 1, 32 do
+                chunk_state[i + b_off] = chunk[i]
+            end
+            os.queueEvent("obcb:update")
+        else
+            print(table.unpack(data))
+        end
+    end
+end,
+function()
+    local mon = peripheral.wrap("monitor_0")
+    mon.setTextScale(0.5)
+    mon.clear()
+    local tw, th = term.getSize()
+    send_chunk_request(chunk_id)
+    send_chunk_subscribe_request(chunk_id)
+    term.setCursorPos(1, 3)
+    print("Showing chunk " .. chunk_id)
+    print(string.format("Screen: %dx%d", mon.getSize()))
+    while true do
+        local ev = { os.pullEvent() }
+        if ev[1] == "char" and ev[2] == "q" then
+            break
+        elseif ev[1] == "obcb:hello" then
+            term.setCursorPos(1, 1)
+            print(string.format("Hello: obcb v%d.%d", ev[2], ev[3]))
+        elseif ev[1] == "obcb:clients" then
+            term.setCursorPos(1, 2)
+            print("Clients: " .. ev[2])
+        elseif ev[1] == "obcb:update" then
+            for y = 1, 81 do
+                mon.setCursorPos(1, y)
+                local tx = {}
+                local bg = {}
+                local fg = {}
+                for x = 1, 164 do
+                    local i = (y - 1) * 164 + (x - 1)
+                    tx[x] = chunk_state[i * 2 + 1]
+                    bg[x] = string.format("%x", bit.band(chunk_state[i * 2 + 2], 0xF))
+                    fg[x] = string.format("%x", bit.band(bit.brshift(chunk_state[i * 2 + 2], 4), 0xF))
+                end
+                mon.blit(string.char(table.unpack(tx)), table.concat(bg), table.concat(fg))
+            end
+        end
+    end
+end)
+
+ws.close()