From 2942cc096882fdaca0a2a6783906dd611d506bd1 Mon Sep 17 00:00:00 2001
From: dandistine <34634876+dandistine@users.noreply.github.com>
Date: Sun, 20 Sep 2026 11:13:57 -0500
Subject: [PATCH 1/3] Only copy the header if it is different

---
 dev/CMakeLists.txt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/dev/CMakeLists.txt b/dev/CMakeLists.txt
index 4895ce0..51a9c6d 100644
--- a/dev/CMakeLists.txt
+++ b/dev/CMakeLists.txt
@@ -45,7 +45,8 @@ else()
 endif()
 
 add_custom_target(CopyHeader
-    COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_BINARY_DIR}/olcPixelGameEngine3.h ${REPO_ROOT_DIR}/olcPixelGameEngine3.h
+    BYPRODUCTS ${REPO_ROOT_DIR}/olcPixelGameEngine3.h
+    COMMAND ${CMAKE_COMMAND} -E copy_if_newer ${CMAKE_BINARY_DIR}/olcPixelGameEngine3.h ${REPO_ROOT_DIR}/olcPixelGameEngine3.h
     DEPENDS olcPixelGameEngine3.h
 )
 

From e8082f0c28fb254c871a2f66fcf8ab648d4fdd2b Mon Sep 17 00:00:00 2001
From: dandistine <34634876+dandistine@users.noreply.github.com>
Date: Sun, 20 Sep 2026 11:27:46 -0500
Subject: [PATCH 2/3] Change to copy_if_different since the github runner is
 out-of-date.

---
 dev/CMakeLists.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dev/CMakeLists.txt b/dev/CMakeLists.txt
index 51a9c6d..61704c9 100644
--- a/dev/CMakeLists.txt
+++ b/dev/CMakeLists.txt
@@ -46,7 +46,7 @@ endif()
 
 add_custom_target(CopyHeader
     BYPRODUCTS ${REPO_ROOT_DIR}/olcPixelGameEngine3.h
-    COMMAND ${CMAKE_COMMAND} -E copy_if_newer ${CMAKE_BINARY_DIR}/olcPixelGameEngine3.h ${REPO_ROOT_DIR}/olcPixelGameEngine3.h
+    COMMAND ${CMAKE_COMMAND} -E copy_if_different ${CMAKE_BINARY_DIR}/olcPixelGameEngine3.h ${REPO_ROOT_DIR}/olcPixelGameEngine3.h
     DEPENDS olcPixelGameEngine3.h
 )
 

From ad2610fc08190c8752601a0ad712d159b019dfab Mon Sep 17 00:00:00 2001
From: dandistine <34634876+dandistine@users.noreply.github.com>
Date: Sun, 20 Sep 2026 12:45:12 -0500
Subject: [PATCH 3/3] Allow the x11 event queue to block if no events are
 present, saving cpu time.

---
 dev/src/host_lin_x11.cpp | 7 +++++++
 dev/src/host_lin_x11.h   | 1 +
 olcPixelGameEngine3.h    | 8 ++++++++
 3 files changed, 16 insertions(+)

diff --git a/dev/src/host_lin_x11.cpp b/dev/src/host_lin_x11.cpp
index cb6866c..750f669 100644
--- a/dev/src/host_lin_x11.cpp
+++ b/dev/src/host_lin_x11.cpp
@@ -131,6 +131,10 @@ namespace olc::host
             return nullptr;
         };
 
+        // Create a pollfd that we will use later to wait for events to appear on the queue
+        // preventing the event loop from becoming a busy loop
+        pollfd x11_connection_fd {.fd = ConnectionNumber(olc_Display), .events = POLLIN};
+
         X11::XEvent xev;
         while(systemActive){
             while (XPending(olc_Display))
@@ -297,6 +301,9 @@ namespace olc::host
                     }
                 }
             }
+
+            // Wait until an event appears on the x11 event queue file descriptor
+            poll(&x11_connection_fd, 1, -1);
         }
 
         systemActive = false;
diff --git a/dev/src/host_lin_x11.h b/dev/src/host_lin_x11.h
index 832f268..f5604bd 100644
--- a/dev/src/host_lin_x11.h
+++ b/dev/src/host_lin_x11.h
@@ -16,6 +16,7 @@
 
 //! START DECLARATION
 #include <GL/gl.h>
+#include <poll.h>
 namespace X11
 {
 #include <X11/X.h>
diff --git a/olcPixelGameEngine3.h b/olcPixelGameEngine3.h
index 2b919d7..f1bb19f 100644
--- a/olcPixelGameEngine3.h
+++ b/olcPixelGameEngine3.h
@@ -5965,6 +5965,7 @@ namespace olc
 #if OLC_HOST == OLC_HOST_LINUX_X11
 
 #include <GL/gl.h>
+#include <poll.h>
 namespace X11
 {
 #include <X11/X.h>
@@ -12365,6 +12366,10 @@ namespace olc::host
             return nullptr;
         };
 
+        // Create a pollfd that we will use later to wait for events to appear on the queue
+        // preventing the event loop from becoming a busy loop
+        pollfd x11_connection_fd {.fd = ConnectionNumber(olc_Display), .events = POLLIN};
+
         X11::XEvent xev;
         while(systemActive){
             while (XPending(olc_Display))
@@ -12531,6 +12536,9 @@ namespace olc::host
                     }
                 }
             }
+
+            // Wait until an event appears on the x11 event queue file descriptor
+            poll(&x11_connection_fd, 1, -1);
         }
 
         systemActive = false;