From eee12181c755de2db95e2748f1a0984dd4164c81 Mon Sep 17 00:00:00 2001
From: Luxferre <lux@ferre>
Date: Sat, 24 Oct 2026 09:03:38 +0300
Subject: [PATCH] games: responsive game loop with non-blocking input polling
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Replaced the blocking select()-based main loop with a proper game loop:
- Process ALL pending X11 input (XPending) before every frame — no more
  missed keypresses from select() blocking for up to a full frame
- Render every frame at 30 fps (FRAME_MS = 33 ms) consistently
- Frame pacing uses select() with a timeout that wakes immediately on
  input, so keypresses are processed within milliseconds
- Game logic (snake steps, tetris gravity) still runs at its own rate via
  nextTick, decoupled from render rate

This eliminates input lag and missed keypresses in both Snake and Tetris.
---
 overlay/rootfs/usr/bin/snake  | Bin 13672 -> 13672 bytes
 overlay/rootfs/usr/bin/tetris | Bin 17764 -> 17764 bytes
 prebuilt/games/usr/bin/snake  | Bin 13672 -> 13672 bytes
 prebuilt/games/usr/bin/tetris | Bin 17764 -> 17764 bytes
 src/games/snake.cpp           |  59 ++++++++++++++++------------------
 src/games/tetris.cpp          |  59 ++++++++++++++++------------------
 6 files changed, 56 insertions(+), 62 deletions(-)

diff --git a/overlay/rootfs/usr/bin/snake b/overlay/rootfs/usr/bin/snake
index c8bf935a4116ca9b9192788bc428f43245be120d..5eda79de33fe22c92b27880aaf808f1fced3fc11 100755
GIT binary patch
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diff --git a/overlay/rootfs/usr/bin/tetris b/overlay/rootfs/usr/bin/tetris
index ead3fddf35bbf65f1ac6922083ab2c0e3453b188..a1a0738aafbb59fe7ea15a1410314c13bec8bb16 100755
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diff --git a/prebuilt/games/usr/bin/snake b/prebuilt/games/usr/bin/snake
index c8bf935a4116ca9b9192788bc428f43245be120d..5eda79de33fe22c92b27880aaf808f1fced3fc11 100755
GIT binary patch
delta 3330
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delta 3364
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diff --git a/prebuilt/games/usr/bin/tetris b/prebuilt/games/usr/bin/tetris
index ead3fddf35bbf65f1ac6922083ab2c0e3453b188..a1a0738aafbb59fe7ea15a1410314c13bec8bb16 100755
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diff --git a/src/games/snake.cpp b/src/games/snake.cpp
index 5744a0c..e2fe959 100644
--- a/src/games/snake.cpp
+++ b/src/games/snake.cpp
@@ -376,45 +376,42 @@ int main() {
 
   int xfd = ConnectionNumber(dpy);
   const unsigned long FRAME_MS = 1000 / 30;  // 30 fps rendering
-  unsigned long lastFrame = now_ms();
+  unsigned long frameStart = now_ms();
 
   while (running) {
-    unsigned long now = now_ms();
-    long until = (long)nextTick - (long)now;
-    if (until < 0) until = 0;
-    // Never block select longer than one frame so the screen stays smooth
-    long wait = (until < (long)FRAME_MS) ? until : (long)FRAME_MS;
-
-    struct timeval tv;
-    tv.tv_sec = wait / 1000;
-    tv.tv_usec = (wait % 1000) * 1000;
-    fd_set fds;
-    FD_ZERO(&fds);
-    FD_SET(xfd, &fds);
-    int r = select(xfd + 1, &fds, nullptr, nullptr, &tv);
-    bool dirty = false;
-    if (r > 0) {
+    // Process all pending input immediately (non-blocking) before each frame
+    while (XPending(dpy)) {
       XEvent e;
-      while (XPending(dpy)) {
-        XNextEvent(dpy, &e);
-        handle_event(e);
-        if (!running) break;
-        dirty = true;
-      }
+      XNextEvent(dpy, &e);
+      handle_event(e);
       if (!running) break;
     }
-    now = now_ms();
-    if (running && now >= nextTick) {
+    if (!running) break;
+
+    unsigned long now = now_ms();
+
+    // Game logic step at its own rate
+    if (now >= nextTick) {
       if (state == PLAYING) step();
-      if (state == PLAYING) nextTick = now + speed;
-      else nextTick = now + 80; // keep loop responsive while paused/over
-      dirty = true;
+      nextTick = now + (state == PLAYING ? speed : 80);
     }
-    // Render at 60 fps or whenever state changed
-    if (dirty || now - lastFrame >= FRAME_MS) {
-      render();
-      lastFrame = now;
+
+    // Render every frame
+    render();
+
+    // Frame pacing: sleep until next frame, but wake up immediately on input
+    now = now_ms();
+    long sleepMs = (long)FRAME_MS - (long)(now - frameStart);
+    if (sleepMs > 0) {
+      struct timeval tv;
+      tv.tv_sec = sleepMs / 1000;
+      tv.tv_usec = (sleepMs % 1000) * 1000;
+      fd_set fds;
+      FD_ZERO(&fds);
+      FD_SET(xfd, &fds);
+      select(xfd + 1, &fds, nullptr, nullptr, &tv);
     }
+    frameStart = now_ms();
   }
 
   XFreeGC(dpy, gc);
diff --git a/src/games/tetris.cpp b/src/games/tetris.cpp
index d19bfb4..e517099 100644
--- a/src/games/tetris.cpp
+++ b/src/games/tetris.cpp
@@ -500,45 +500,42 @@ int main() {
 
   int xfd = ConnectionNumber(dpy);
   const unsigned long FRAME_MS = 1000 / 30;  // 30 fps rendering
-  unsigned long lastFrame = now_ms();
+  unsigned long frameStart = now_ms();
 
   while (running) {
-    unsigned long now = now_ms();
-    long until = (long)nextTick - (long)now;
-    if (until < 0) until = 0;
-    // Never block select longer than one frame so the screen stays smooth
-    long wait = (until < (long)FRAME_MS) ? until : (long)FRAME_MS;
-
-    struct timeval tv;
-    tv.tv_sec = wait / 1000;
-    tv.tv_usec = (wait % 1000) * 1000;
-    fd_set fds;
-    FD_ZERO(&fds);
-    FD_SET(xfd, &fds);
-    int r = select(xfd + 1, &fds, nullptr, nullptr, &tv);
-    bool dirty = false;
-    if (r > 0) {
+    // Process all pending input immediately (non-blocking) before each frame
+    while (XPending(dpy)) {
       XEvent e;
-      while (XPending(dpy)) {
-        XNextEvent(dpy, &e);
-        handle_event(e);
-        if (!running) break;
-        dirty = true;
-      }
+      XNextEvent(dpy, &e);
+      handle_event(e);
       if (!running) break;
     }
-    now = now_ms();
-    if (running && now >= nextTick) {
+    if (!running) break;
+
+    unsigned long now = now_ms();
+
+    // Game logic step at its own rate
+    if (now >= nextTick) {
       if (state == PLAYING) step();
-      if (state == PLAYING) nextTick = now + speed;
-      else nextTick = now + 80;
-      dirty = true;
+      nextTick = now + (state == PLAYING ? speed : 80);
     }
-    // Render at 60 fps or whenever state changed
-    if (dirty || now - lastFrame >= FRAME_MS) {
-      render();
-      lastFrame = now;
+
+    // Render every frame
+    render();
+
+    // Frame pacing: sleep until next frame, but wake up immediately on input
+    now = now_ms();
+    long sleepMs = (long)FRAME_MS - (long)(now - frameStart);
+    if (sleepMs > 0) {
+      struct timeval tv;
+      tv.tv_sec = sleepMs / 1000;
+      tv.tv_usec = (sleepMs % 1000) * 1000;
+      fd_set fds;
+      FD_ZERO(&fds);
+      FD_SET(xfd, &fds);
+      select(xfd + 1, &fds, nullptr, nullptr, &tv);
     }
+    frameStart = now_ms();
   }
 
   XFreeGC(dpy, gc);