From 0e670d7224f8547fb764206e8f45fd1e3779ab80 Mon Sep 17 00:00:00 2001
From: Luxferre <lux@ferre>
Date: Sat, 24 Oct 2026 14:21:24 +0300
Subject: [PATCH] games: jitter-free stepping via timerfd + clearer Snake
 playfield

Replace the select() timeout sleep with a Linux timerfd high-resolution
timer. It fires on an absolute CLOCK_MONOTONIC deadline, so wakeups are
no longer quantized to the kernel tick (a short final wait was rounded
up to a whole tick, causing +-10-22ms jitter and lurches). The loop now
select()s on both the X connection fd and the timer fd, so input still
wakes it immediately and no busy-spin is needed -- the controls stay
responsive. A select()-timeout fallback is kept for non-timerfd setups.

Snake: draw a bright frame around the actual playfield so its boundary is
unmistakable, and move the SCORE/BEST label down into the margin between
the window frame and the playfield frame.
---
 overlay/rootfs/usr/bin/snake  | Bin 13716 -> 13716 bytes
 overlay/rootfs/usr/bin/tetris | Bin 17812 -> 17812 bytes
 prebuilt/games/usr/bin/snake  | Bin 13716 -> 13716 bytes
 prebuilt/games/usr/bin/tetris | Bin 17812 -> 17812 bytes
 src/games/snake.cpp           | 162 ++++++++++++++++++++++++----------
 src/games/tetris.cpp          | 150 ++++++++++++++++++++++---------
 6 files changed, 225 insertions(+), 87 deletions(-)

diff --git a/overlay/rootfs/usr/bin/snake b/overlay/rootfs/usr/bin/snake
index 9f8bcdf795c3936f5ecf7cc0867739d4f98014a0..8bdf63a03475762a15d5765ded9655c9c6652892 100755
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diff --git a/overlay/rootfs/usr/bin/tetris b/overlay/rootfs/usr/bin/tetris
index 84af923ed46bbaff202bf859eeaae33b37f8167f..ebc99c4696c4a4dd128bb9a2f903ef90fa9672b7 100755
GIT binary patch
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diff --git a/prebuilt/games/usr/bin/snake b/prebuilt/games/usr/bin/snake
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diff --git a/prebuilt/games/usr/bin/tetris b/prebuilt/games/usr/bin/tetris
index 84af923ed46bbaff202bf859eeaae33b37f8167f..ebc99c4696c4a4dd128bb9a2f903ef90fa9672b7 100755
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diff --git a/src/games/snake.cpp b/src/games/snake.cpp
index c657105..e268cea 100644
--- a/src/games/snake.cpp
+++ b/src/games/snake.cpp
@@ -21,6 +21,10 @@
 #include <X11/Xutil.h>
 #include <X11/keysym.h>
 #include <X11/Xatom.h>
+#include <time.h>
+#include <sys/timerfd.h>
+#include <cstdint>
+#include <cerrno>
 
 static const int TOPBAR = 24;
 static const int COLS = 24;
@@ -111,9 +115,9 @@ static int speed = 100;            // ms per step (derived from pps below)
 static int pps = 90;               // base speed px/sec; +1 px/sec per 5 food eaten
 static bool running = true;
 static unsigned long now_ms() {
-  struct timeval tv;
-  gettimeofday(&tv, nullptr);
-  return (unsigned long)(tv.tv_sec * 1000 + tv.tv_usec / 1000);
+  struct timespec ts;
+  clock_gettime(CLOCK_MONOTONIC, &ts);
+  return (unsigned long)(ts.tv_sec * 1000 + ts.tv_nsec / 1000000);
 }
 
 // Derive the per-step delay (ms) from the target pixels/second. The snake
@@ -270,14 +274,20 @@ static void render() {
   // head
   XSetForeground(dpy, gc, C_HEAD);
   XFillRectangle(dpy, back, gc, gx0 + snake[snakelen - 1][0] * cell, gy0 + snake[snakelen - 1][1] * cell, cell, cell);
+  // bright frame around the playfield so its boundaries are unmistakable
+  XSetForeground(dpy, gc, C_FG);
+  XDrawRectangle(dpy, back, gc, gx0, gy0, gw, gh);
 
-  // score (top status strip, clear of the playfield border)
+  // score / best sit in the margin between the window frame (outer) and the
+  // playfield frame (inner), vertically centred there so the playfield boundary
+  // stays clear
+  int scoreY = (2 + gy0) / 2 - 3;
   char buf[32];
   snprintf(buf, sizeof(buf), "SCORE %d", score);
-  draw_text(gx0, 4, 1, C_DIM, buf);
+  draw_text(gx0, scoreY, 1, C_DIM, buf);
   if (best > 0) {
     snprintf(buf, sizeof(buf), "BEST %d", best);
-    draw_text(gx0 + gw - 11 * 6, 4, 1, C_DIM, buf);
+    draw_text(gx0 + gw - 11 * 6, scoreY, 1, C_DIM, buf);
   }
 
   if (state == PAUSED || state == GAMEOVER) {
@@ -402,55 +412,117 @@ int main() {
   render();
 
   int xfd = ConnectionNumber(dpy);
-  const unsigned long FRAME_MS = 1000 / 30;  // 30 fps rendering
-  unsigned long lastFrame = now_ms();
-  unsigned long accumulator = 0;
+
+  // Precise, drift-free stepping via a kernel high-resolution timer (timerfd).
+  // The timer fires on an absolute CLOCK_MONOTONIC deadline, so wakeups are not
+  // quantized to the kernel tick the way a select() timeout is. A select()
+  // timeout shorter than one tick gets rounded UP to a whole tick, which made
+  // the final few milliseconds of each wait overshoot by up to ~20ms and showed
+  // up as speed jitter. Input still arrives on the X connection fd, so we
+  // select() on BOTH fds and react to either immediately -- there is no
+  // busy-spin, so the X server stays free and the controls stay responsive.
+  int tfd = -1;
+#if defined(__linux__)
+  tfd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK | TFD_CLOEXEC);
+#endif
+
+  unsigned long nextStep = now_ms() + speed;
+  State prevState = PLAYING;
+
+  auto arm_timer = [&](unsigned long deadline_ms) {
+    struct itimerspec its;
+    its.it_interval.tv_sec = 0; its.it_interval.tv_nsec = 0;  // one-shot
+    its.it_value.tv_sec = (time_t)(deadline_ms / 1000);
+    its.it_value.tv_nsec = (long)((deadline_ms % 1000) * 1000000UL);
+    if (its.it_value.tv_nsec >= 1000000000L) {
+      its.it_value.tv_sec += 1; its.it_value.tv_nsec -= 1000000000L;
+    }
+    timerfd_settime(tfd, TFD_TIMER_ABSTIME, &its, nullptr);
+  };
+  auto disarm_timer = [&]() {
+    struct itimerspec its;
+    memset(&its, 0, sizeof(its));
+    timerfd_settime(tfd, 0, &its, nullptr);
+  };
+
+  if (tfd >= 0) arm_timer(nextStep);
 
   while (running) {
-    // Process all pending input immediately (non-blocking) before each frame
-    while (XPending(dpy)) {
-      XEvent e;
-      XNextEvent(dpy, &e);
-      handle_event(e);
+    fd_set fds;
+    FD_ZERO(&fds);
+    FD_SET(xfd, &fds);
+    int nfds = xfd + 1;
+    struct timeval tvbuf, *tvp = nullptr;
+
+    if (tfd >= 0) {
+      // While playing, also wait on the timer fd. While paused / game over the
+      // timer is disarmed, so we block on input only (resume stays instant).
+      if (state == PLAYING) {
+        FD_SET(tfd, &fds);
+        if (tfd + 1 > nfds) nfds = tfd + 1;
+      }
+    } else {
+      // Fallback (timerfd unavailable): bounded select so input stays live.
+      long sleepMs = (state == PLAYING) ? (long)nextStep - (long)now_ms() : 30;
+      if (sleepMs < 0) sleepMs = 0;
+      tvbuf.tv_sec = sleepMs / 1000;
+      tvbuf.tv_usec = (sleepMs % 1000) * 1000;
+      tvp = &tvbuf;
+    }
+
+    int r = select(nfds, &fds, nullptr, nullptr, tvp);
+    if (r < 0) { if (errno == EINTR) continue; break; }
+
+    // 1) Drain pending input first so key presses are never delayed.
+    if (FD_ISSET(xfd, &fds) || XPending(dpy)) {
+      while (XPending(dpy)) {
+        XEvent e;
+        XNextEvent(dpy, &e);
+        handle_event(e);
+        if (!running) break;
+      }
       if (!running) break;
     }
-    if (!running) break;
 
-    unsigned long now = now_ms();
-    unsigned long elapsed = now - lastFrame;
-    lastFrame = now;
-
-    // Cap elapsed time to prevent spiral of death
-    if (elapsed > 200) elapsed = 200;
-
-    // Accumulate time
-    accumulator += elapsed;
-
-    // Step game logic at fixed rate (max 2 steps per frame to prevent spiral)
-    int steps = 0;
-    while (accumulator >= (unsigned long)speed && steps < 2) {
-      if (state == PLAYING) step();
-      accumulator -= speed;
-      steps++;
+    // 2) (Re)start play cleanly: resync the clock on resume / restart / launch,
+    //    and stop the timer whenever we leave the PLAYING state.
+    if (state != prevState) {
+      if (state == PLAYING) { nextStep = now_ms() + speed; if (tfd >= 0) arm_timer(nextStep); }
+      else if (tfd >= 0) disarm_timer();
+      prevState = state;
     }
 
-    // Render every frame
+    // 3) Advance the simulation exactly once per timer expiration (or, in the
+    //    fallback path, whenever the deadline is reached). If we ever fell more
+    //    than one interval behind (e.g. the process was frozen for a screenshot)
+    //    we drop the backlog instead of racing to catch up.
+    if (state == PLAYING) {
+      bool due = false;
+      if (tfd >= 0) {
+        if (FD_ISSET(tfd, &fds)) {
+          uint64_t expirations = 0;
+          ssize_t n = read(tfd, &expirations, sizeof(expirations));
+          (void)n; (void)expirations;
+          due = true;
+        }
+      } else {
+        if ((long)(now_ms() - nextStep) >= 0) due = true;
+      }
+      if (due) {
+        step();
+        nextStep += speed;          // advance by exactly one interval (no drift)
+        unsigned long now = now_ms();
+        if ((long)(now - nextStep) > (long)speed) nextStep = now + speed;
+        if (tfd >= 0 && state == PLAYING) arm_timer(nextStep);
+      }
+    }
+
+    // 4) Repaint on every loop turn (input or step) so the display never
+    //    appears frozen and key feedback is immediate.
     render();
-
-    // Frame pacing: sleep until next frame, but wake up immediately on input
-    now = now_ms();
-    long sleepMs = (long)FRAME_MS - (long)(now - (lastFrame - elapsed));
-    if (sleepMs > 0 && sleepMs <= (long)FRAME_MS) {
-      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);
-    }
   }
 
+  if (tfd >= 0) close(tfd);
   XFreeGC(dpy, gc);
   XFreePixmap(dpy, back);
   XDestroyWindow(dpy, win);
diff --git a/src/games/tetris.cpp b/src/games/tetris.cpp
index def1d2a..14aa29b 100644
--- a/src/games/tetris.cpp
+++ b/src/games/tetris.cpp
@@ -22,6 +22,10 @@
 #include <X11/Xutil.h>
 #include <X11/keysym.h>
 #include <X11/Xatom.h>
+#include <time.h>
+#include <sys/timerfd.h>
+#include <cstdint>
+#include <cerrno>
 
 static const int TOPBAR = 24;
 static const int PCOLS = 10;
@@ -136,9 +140,9 @@ static bool collide(int px, int py, int cells[4][2]) {
 }
 
 static unsigned long now_ms() {
-  struct timeval tv;
-  gettimeofday(&tv, nullptr);
-  return (unsigned long)(tv.tv_sec * 1000 + tv.tv_usec / 1000);
+  struct timespec ts;
+  clock_gettime(CLOCK_MONOTONIC, &ts);
+  return (unsigned long)(ts.tv_sec * 1000 + ts.tv_nsec / 1000000);
 }
 
 // Derive the gravity delay (ms) from the target pixels/second. A piece drops
@@ -516,55 +520,117 @@ int main() {
   render();
 
   int xfd = ConnectionNumber(dpy);
-  const unsigned long FRAME_MS = 1000 / 30;  // 30 fps rendering
-  unsigned long lastFrame = now_ms();
-  unsigned long accumulator = 0;
+
+  // Precise, drift-free stepping via a kernel high-resolution timer (timerfd).
+  // The timer fires on an absolute CLOCK_MONOTONIC deadline, so wakeups are not
+  // quantized to the kernel tick the way a select() timeout is. A select()
+  // timeout shorter than one tick gets rounded UP to a whole tick, which made
+  // the final few milliseconds of each wait overshoot by up to ~20ms and showed
+  // up as speed jitter. Input still arrives on the X connection fd, so we
+  // select() on BOTH fds and react to either immediately -- there is no
+  // busy-spin, so the X server stays free and the controls stay responsive.
+  int tfd = -1;
+#if defined(__linux__)
+  tfd = timerfd_create(CLOCK_MONOTONIC, TFD_NONBLOCK | TFD_CLOEXEC);
+#endif
+
+  unsigned long nextStep = now_ms() + speed;
+  State prevState = PLAYING;
+
+  auto arm_timer = [&](unsigned long deadline_ms) {
+    struct itimerspec its;
+    its.it_interval.tv_sec = 0; its.it_interval.tv_nsec = 0;  // one-shot
+    its.it_value.tv_sec = (time_t)(deadline_ms / 1000);
+    its.it_value.tv_nsec = (long)((deadline_ms % 1000) * 1000000UL);
+    if (its.it_value.tv_nsec >= 1000000000L) {
+      its.it_value.tv_sec += 1; its.it_value.tv_nsec -= 1000000000L;
+    }
+    timerfd_settime(tfd, TFD_TIMER_ABSTIME, &its, nullptr);
+  };
+  auto disarm_timer = [&]() {
+    struct itimerspec its;
+    memset(&its, 0, sizeof(its));
+    timerfd_settime(tfd, 0, &its, nullptr);
+  };
+
+  if (tfd >= 0) arm_timer(nextStep);
 
   while (running) {
-    // Process all pending input immediately (non-blocking) before each frame
-    while (XPending(dpy)) {
-      XEvent e;
-      XNextEvent(dpy, &e);
-      handle_event(e);
+    fd_set fds;
+    FD_ZERO(&fds);
+    FD_SET(xfd, &fds);
+    int nfds = xfd + 1;
+    struct timeval tvbuf, *tvp = nullptr;
+
+    if (tfd >= 0) {
+      // While playing, also wait on the timer fd. While paused / game over the
+      // timer is disarmed, so we block on input only (resume stays instant).
+      if (state == PLAYING) {
+        FD_SET(tfd, &fds);
+        if (tfd + 1 > nfds) nfds = tfd + 1;
+      }
+    } else {
+      // Fallback (timerfd unavailable): bounded select so input stays live.
+      long sleepMs = (state == PLAYING) ? (long)nextStep - (long)now_ms() : 30;
+      if (sleepMs < 0) sleepMs = 0;
+      tvbuf.tv_sec = sleepMs / 1000;
+      tvbuf.tv_usec = (sleepMs % 1000) * 1000;
+      tvp = &tvbuf;
+    }
+
+    int r = select(nfds, &fds, nullptr, nullptr, tvp);
+    if (r < 0) { if (errno == EINTR) continue; break; }
+
+    // 1) Drain pending input first so key presses are never delayed.
+    if (FD_ISSET(xfd, &fds) || XPending(dpy)) {
+      while (XPending(dpy)) {
+        XEvent e;
+        XNextEvent(dpy, &e);
+        handle_event(e);
+        if (!running) break;
+      }
       if (!running) break;
     }
-    if (!running) break;
 
-    unsigned long now = now_ms();
-    unsigned long elapsed = now - lastFrame;
-    lastFrame = now;
-
-    // Cap elapsed time to prevent spiral of death
-    if (elapsed > 200) elapsed = 200;
-
-    // Accumulate time
-    accumulator += elapsed;
-
-    // Step game logic at fixed rate (max 2 steps per frame to prevent spiral)
-    int steps = 0;
-    while (accumulator >= (unsigned long)speed && steps < 2) {
-      if (state == PLAYING) step();
-      accumulator -= speed;
-      steps++;
+    // 2) (Re)start play cleanly: resync the clock on resume / restart / launch,
+    //    and stop the timer whenever we leave the PLAYING state.
+    if (state != prevState) {
+      if (state == PLAYING) { nextStep = now_ms() + speed; if (tfd >= 0) arm_timer(nextStep); }
+      else if (tfd >= 0) disarm_timer();
+      prevState = state;
     }
 
-    // Render every frame
+    // 3) Advance the simulation exactly once per timer expiration (or, in the
+    //    fallback path, whenever the deadline is reached). If we ever fell more
+    //    than one interval behind (e.g. the process was frozen for a screenshot)
+    //    we drop the backlog instead of racing to catch up.
+    if (state == PLAYING) {
+      bool due = false;
+      if (tfd >= 0) {
+        if (FD_ISSET(tfd, &fds)) {
+          uint64_t expirations = 0;
+          ssize_t n = read(tfd, &expirations, sizeof(expirations));
+          (void)n; (void)expirations;
+          due = true;
+        }
+      } else {
+        if ((long)(now_ms() - nextStep) >= 0) due = true;
+      }
+      if (due) {
+        step();
+        nextStep += speed;          // advance by exactly one interval (no drift)
+        unsigned long now = now_ms();
+        if ((long)(now - nextStep) > (long)speed) nextStep = now + speed;
+        if (tfd >= 0 && state == PLAYING) arm_timer(nextStep);
+      }
+    }
+
+    // 4) Repaint on every loop turn (input or step) so the display never
+    //    appears frozen and key feedback is immediate.
     render();
-
-    // Frame pacing: sleep until next frame, but wake up immediately on input
-    now = now_ms();
-    long sleepMs = (long)FRAME_MS - (long)(now - (lastFrame - elapsed));
-    if (sleepMs > 0 && sleepMs <= (long)FRAME_MS) {
-      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);
-    }
   }
 
+  if (tfd >= 0) close(tfd);
   XFreeGC(dpy, gc);
   XFreePixmap(dpy, back);
   XDestroyWindow(dpy, win);