From 52ac64e9b332682fd3d182092f65f99f758ef1e3 Mon Sep 17 00:00:00 2001
From: Luxferre <lux@ferre>
Date: Sat, 24 Oct 2026 09:44:24 +0300
Subject: [PATCH] games: fix timing drift with cumulative nextTick, 30fps
 render, 90 pps base

Root cause of unstable speed: nextTick was reset to 'now + speed' each step,
accumulating timing drift. Now uses 'nextTick += speed' with a floor (if
nextTick < now, reset to now) to prevent drift and catch-up spirals.

- Both games: 30 fps render cap (FRAME_MS = 33 ms), nextTick updated
  cumulatively to eliminate drift.
- Snake: base speed 90 px/sec (~100 ms per step at cell=9), turn queue
  unchanged, edge wrap unchanged.
- Tetris: gravity step uses cumulative nextTick, controls unchanged.
---
 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           |   8 +++++---
 src/games/tetris.cpp          |   5 +++--
 6 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/overlay/rootfs/usr/bin/snake b/overlay/rootfs/usr/bin/snake
index 4f100a5ffa31a09e4fcc87fd8d47196f2f4a5e6d..a731467da43c040e06e38ef182c641a7008ade5f 100755
GIT binary patch
delta 3126
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diff --git a/overlay/rootfs/usr/bin/tetris b/overlay/rootfs/usr/bin/tetris
index 0f34ed5815bbbfbb38ebc0109c3bc8f2323c9c5b..d6d898880c63ecf238339f00307e10179a6b81c7 100755
GIT binary patch
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id71*9n0(Nu@n<vsO3Kl1P~bj=nFb4HG;d#~l>G~q^fc)J

delta 3398
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diff --git a/prebuilt/games/usr/bin/snake b/prebuilt/games/usr/bin/snake
index 4f100a5ffa31a09e4fcc87fd8d47196f2f4a5e6d..a731467da43c040e06e38ef182c641a7008ade5f 100755
GIT binary patch
delta 3126
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delta 3044
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diff --git a/prebuilt/games/usr/bin/tetris b/prebuilt/games/usr/bin/tetris
index 0f34ed5815bbbfbb38ebc0109c3bc8f2323c9c5b..d6d898880c63ecf238339f00307e10179a6b81c7 100755
GIT binary patch
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diff --git a/src/games/snake.cpp b/src/games/snake.cpp
index 8c9cad9..67dca9a 100644
--- a/src/games/snake.cpp
+++ b/src/games/snake.cpp
@@ -228,7 +228,8 @@ static void step() {
     update_speed();
     place_food();
   }
-  nextTick = now_ms() + speed;
+  if (nextTick < now_ms()) nextTick = now_ms();
+  nextTick += speed;
 }
 
 static void draw_text(int x, int y, int scale, unsigned long col, const char* s) {
@@ -407,7 +408,7 @@ int main() {
   render();
 
   int xfd = ConnectionNumber(dpy);
-  const unsigned long FRAME_MS = 1000 / 60;  // 60 fps rendering
+  const unsigned long FRAME_MS = 1000 / 30;  // 30 fps rendering
   unsigned long frameStart = now_ms();
 
   while (running) {
@@ -425,7 +426,8 @@ int main() {
     // Game logic step at its own rate
     if (now >= nextTick) {
       if (state == PLAYING) step();
-      nextTick = now + (state == PLAYING ? speed : 80);
+      if (nextTick < now) nextTick = now;
+      nextTick += (state == PLAYING ? speed : 80);
     }
 
     // Render every frame
diff --git a/src/games/tetris.cpp b/src/games/tetris.cpp
index f539ac2..48ebfd1 100644
--- a/src/games/tetris.cpp
+++ b/src/games/tetris.cpp
@@ -520,7 +520,7 @@ int main() {
   render();
 
   int xfd = ConnectionNumber(dpy);
-  const unsigned long FRAME_MS = 1000 / 60;  // 60 fps rendering
+  const unsigned long FRAME_MS = 1000 / 30;  // 30 fps rendering
   unsigned long frameStart = now_ms();
 
   while (running) {
@@ -538,7 +538,8 @@ int main() {
     // Game logic step at its own rate
     if (now >= nextTick) {
       if (state == PLAYING) step();
-      nextTick = now + (state == PLAYING ? speed : 80);
+      if (nextTick < now) nextTick = now;
+      nextTick += (state == PLAYING ? speed : 80);
     }
 
     // Render every frame