From e930b6ac20dd1ae5718b750b90131f2a9828e50e Mon Sep 17 00:00:00 2001
From: Alexander Jacobsen <dev@alexbmj.com>
Date: Sat, 18 Jul 2026 01:27:22 +0200
Subject: [PATCH 1/4] fix Makefile after rename to pixelflut.c

---
 Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 7a6c18a..177fdae 100644
--- a/Makefile
+++ b/Makefile
@@ -20,8 +20,8 @@ TARGETS = pixelflut-render pixelflut-bench
 
 all: $(TARGETS)
 
-pixelflut-render: new.c pixelflut.h
-	$(CC) $(STD) $(OPT) -pthread $(WARN) $(EXTRA) -o $@ new.c
+pixelflut-render: pixelflut.c pixelflut.h
+	$(CC) $(STD) $(OPT) -pthread $(WARN) $(EXTRA) -o $@ pixelflut.c
 
 pixelflut-bench: bench.c pixelflut.h
 	$(CC) $(STD) $(OPT) -pthread $(WARN) $(EXTRA) -o $@ bench.c

From 5c8ca0f5b49c98d1502459d7223487149cc41d82 Mon Sep 17 00:00:00 2001
From: Alexander Jacobsen <dev@alexbmj.com>
Date: Sat, 18 Jul 2026 01:28:31 +0200
Subject: [PATCH 2/4] move to left side of screen

---
 pixelflut.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pixelflut.c b/pixelflut.c
index 1a8b2e6..1f3cf2e 100644
--- a/pixelflut.c
+++ b/pixelflut.c
@@ -65,7 +65,7 @@
 #define FRAME_BYTES    (FRAME_PIXELS * FRAME_CHANNELS)
 
 /* Top-left corner where the frame is drawn on the shared wall. */
-#define CANVAS_OFFSET_X 1200
+#define CANVAS_OFFSET_X 80
 #define CANVAS_OFFSET_Y 40
 
 /* Number of datagrams needed to cover a whole frame once. */

From f8dfe27c571b1faeaa5eea0a8d016b69e3672770 Mon Sep 17 00:00:00 2001
From: Alexander Jacobsen <dev@alexbmj.com>
Date: Sat, 18 Jul 2026 01:28:41 +0200
Subject: [PATCH 3/4] add run.sh

---
 run.sh | 2 ++
 1 file changed, 2 insertions(+)
 create mode 100755 run.sh

diff --git a/run.sh b/run.sh
new file mode 100755
index 0000000..d0eef33
--- /dev/null
+++ b/run.sh
@@ -0,0 +1,2 @@
+#!/usr/bin/env bash
+./pixelflut-render ix1 2

From 2737945b4cb89e7f3fce5b9a9e55f6e23133b8bf Mon Sep 17 00:00:00 2001
From: Alexander Jacobsen <dev@alexbmj.com>
Date: Sat, 18 Jul 2026 01:50:12 +0200
Subject: [PATCH 4/4] better error handling

---
 pixelflut.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/pixelflut.c b/pixelflut.c
index 1f3cf2e..466c2f0 100644
--- a/pixelflut.c
+++ b/pixelflut.c
@@ -231,15 +231,21 @@ static void *worker_main(void *arg)
 				/* Transient back-pressure. Back off briefly so the queue
 				 * drains (rather than spinning on failing syscalls), then
 				 * resend the same batch - no need to repaint. */
-				usleep(200);
+				usleep(100);
 				continue;
 			case ECONNREFUSED:
 				break; /* stale ICMP on connected UDP; repaint and retry */
+			case EHOSTUNREACH: /* display down / IPv6 ND unresolved */
+			case ENETUNREACH:
+			case EHOSTDOWN:
+			case ENETDOWN:
+				usleep(100000);
+				break;
 			default:
 				perror("sendmmsg");
 				break;
 			}
-			break; /* ECONNREFUSED / unexpected: stop, repaint, retry */
+			break;
 		}
 	}