From ba22224a22858eca7146e4ffd5dda019c326cc6f Mon Sep 17 00:00:00 2001
From: Lucas Magasweran <lucasrangit@gmail.com>
Date: Sat, 13 Nov 2021 14:58:31 +0100
Subject: [PATCH 1/3] emulator: convert from Python 2 to 3 using 2to3

---
 emulator.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/emulator.py b/emulator.py
index 6050ec4..7644735 100755
--- a/emulator.py
+++ b/emulator.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 """
@@ -69,7 +69,7 @@ def recv_data(self):
         Grab the next frame and put it on the matrix.
         """
         data, addr = self.sock.recvfrom(self.packetsize)
-        matrix = map(ord, data.strip())
+        matrix = list(map(ord, data.strip()))
         if len(matrix) == self.packetsize:
             self.matrix = matrix[:-4]
 

From 2e566e6886bfb12a67c3b7f7133f7282aace670f Mon Sep 17 00:00:00 2001
From: Lucas Magasweran <lucasrangit@gmail.com>
Date: Sat, 13 Nov 2021 20:57:53 +0100
Subject: [PATCH 2/3] emulator: drop CRC if present and fix the out of bounds
 issue

---
 emulator.py | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/emulator.py b/emulator.py
index 7644735..7f5e43d 100755
--- a/emulator.py
+++ b/emulator.py
@@ -69,9 +69,8 @@ def recv_data(self):
         Grab the next frame and put it on the matrix.
         """
         data, addr = self.sock.recvfrom(self.packetsize)
-        matrix = list(map(ord, data.strip()))
-        if len(matrix) == self.packetsize:
-            self.matrix = matrix[:-4]
+        self.matrix = list(data.strip())[:self.packetsize-4]
+
 
     def update(self):
         """
@@ -81,8 +80,7 @@ def update(self):
         for x in range(self.width):
             for y in range(self.height):
                 pixel = y * self.width * 3 + x * 3
-                #TODO: sometimes the matrix is not as big as it should
-                if pixel < pixels:
+                if pixel < pixels - 2:
                     pygame.draw.circle(self.screen,
                                        (self.matrix[pixel], self.matrix[pixel + 1], self.matrix[pixel + 2]),
                                        (x * self.dotsize + self.dotsize / 2, y * self.dotsize + self.dotsize / 2), self.dotsize / 2, 0)

From f1138c802f8521998c974eae704127c364d1160e Mon Sep 17 00:00:00 2001
From: Lucas Magasweran <lucasrangit@gmail.com>
Date: Sat, 13 Nov 2021 21:28:44 +0100
Subject: [PATCH 3/3] emulator: make UDP nonblocking and add a refresh rate (60
 Hz) to reduce CPU usage

---
 emulator.py | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/emulator.py b/emulator.py
index 7f5e43d..5973e0b 100755
--- a/emulator.py
+++ b/emulator.py
@@ -32,6 +32,7 @@
 __email__ = 'email@ricardo.band'
 __status__ = 'Development'
 
+import select
 import sys
 import socket
 
@@ -60,6 +61,7 @@ def __init__(self, width=40, height=16, ip='127.0.0.1', port=1337, dotsize=10):
             self.matrix.append(0)
 
         self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+        self.sock.setblocking(0)
         self.sock.bind((ip, port))
         # size is width * height * 3 (rgb) + 4 (checksum)
         self.packetsize = self.width * self.height * 3 + 4
@@ -68,8 +70,13 @@ def recv_data(self):
         """
         Grab the next frame and put it on the matrix.
         """
-        data, addr = self.sock.recvfrom(self.packetsize)
-        self.matrix = list(data.strip())[:self.packetsize-4]
+        select.select([], [self.sock], [])
+        try:
+            data, addr = self.sock.recvfrom(self.packetsize)
+        except socket.error:
+            pass
+        else:
+            self.matrix = list(data.strip())[:self.packetsize-4]
 
 
     def update(self):
@@ -91,6 +98,7 @@ def render(self):
         """
         pygame.display.update()
         pygame.display.flip()
+        self.clock.tick(60)
 
     def gameloop(self):
         """