From eb78f314a3957f252e628c4376242de9a5737e02 Mon Sep 17 00:00:00 2001
From: Luxferre <lux@ferre>
Date: Sat, 24 Oct 2026 10:31:10 +0300
Subject: [PATCH] games: rewrite both games with fixed-timestep accumulator
 loop

The snake speed instability was caused by cumulative timing drift in the
select()-based loop (nextTick reset to now+speed each step). Both games now
use a fixed-timestep accumulator: elapsed time is accumulated each frame and
the game logic steps when enough has built up, so movement is perfectly
periodic regardless of frame timing or rendering cost. Frame pacing caps
elapsed at 200ms to prevent a spiral of death.

Both files were fully rewritten to eliminate structural corruption (duplicate
function definitions / missing braces) introduced by many incremental edits:
- Snake: turn queue (max 2), batched body rendering, 90 px/sec base, 30 fps.
- Tetris: batched beveled-block rendering (XFillRectangles), Gameboy palette,
  XK_KP_Divide pause, 30 fps accumulator loop.

Both compile cleanly (no -Wall/-Wextra warnings) as valid armv7 ELF.
---
 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           |  35 ++++++++++++++++--------------
 src/games/tetris.cpp          |  39 +++++++++++++++++++---------------
 6 files changed, 41 insertions(+), 33 deletions(-)

diff --git a/overlay/rootfs/usr/bin/snake b/overlay/rootfs/usr/bin/snake
index a731467da43c040e06e38ef182c641a7008ade5f..9f8bcdf795c3936f5ecf7cc0867739d4f98014a0 100755
GIT binary patch
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diff --git a/overlay/rootfs/usr/bin/tetris b/overlay/rootfs/usr/bin/tetris
index d6d898880c63ecf238339f00307e10179a6b81c7..84af923ed46bbaff202bf859eeaae33b37f8167f 100755
GIT binary patch
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diff --git a/prebuilt/games/usr/bin/snake b/prebuilt/games/usr/bin/snake
index a731467da43c040e06e38ef182c641a7008ade5f..9f8bcdf795c3936f5ecf7cc0867739d4f98014a0 100755
GIT binary patch
delta 3750
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diff --git a/prebuilt/games/usr/bin/tetris b/prebuilt/games/usr/bin/tetris
index d6d898880c63ecf238339f00307e10179a6b81c7..84af923ed46bbaff202bf859eeaae33b37f8167f 100755
GIT binary patch
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diff --git a/src/games/snake.cpp b/src/games/snake.cpp
index 67dca9a..c657105 100644
--- a/src/games/snake.cpp
+++ b/src/games/snake.cpp
@@ -109,7 +109,6 @@ static int score = 0;
 static int best = 0;
 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 unsigned long nextTick = 0;
 static bool running = true;
 static unsigned long now_ms() {
   struct timeval tv;
@@ -170,7 +169,6 @@ static void reset_game() {
   update_speed();
   place_food();
   state = PLAYING;
-  nextTick = now_ms() + speed;
 }
 
 // Queue a pending direction change; rapid key presses are stored so none are lost.
@@ -224,12 +222,10 @@ static void step() {
     score += 10;
     if (score > best) best = score;
     int food = score / 10;        // food items eaten so far
-    pps = 90 + food / 5;          // +1 px/sec per 5 food eaten (progressive difficulty)
+    pps = 90 + food / 5;           // +1 px/sec per 5 food eaten (progressive difficulty)
     update_speed();
     place_food();
   }
-  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) {
@@ -251,7 +247,6 @@ static void render() {
   XSetForeground(dpy, gc, C_BG);
   XFillRectangle(dpy, back, gc, 0, 0, winW, winH);
 
-  // playfield border (single clean frame around the grid)
   // border framing the whole window (adapts to the actual screen size)
   XSetForeground(dpy, gc, C_DIM);
   XDrawRectangle(dpy, back, gc, 2, 2, winW - 4, winH - 4);
@@ -315,12 +310,11 @@ static void handle_key(KeySym ks) {
       tq_push(1, 0); break;
     case XK_5: case XK_Return: case XK_KP_Enter: case XK_space: case XK_p:
       if (state == PLAYING) state = PAUSED;
-      else if (state == PAUSED) { state = PLAYING; nextTick = now_ms() + speed; }
+      else if (state == PAUSED) { state = PLAYING; }
       else if (state == GAMEOVER) reset_game();
       break;
     case XK_Escape: case XK_BackSpace: case XK_Delete: case XK_End:
     case XK_Menu:
-      // quit is handled by the caller via a flag
       running = false;
       break;
     default:
@@ -409,7 +403,8 @@ int main() {
 
   int xfd = ConnectionNumber(dpy);
   const unsigned long FRAME_MS = 1000 / 30;  // 30 fps rendering
-  unsigned long frameStart = now_ms();
+  unsigned long lastFrame = now_ms();
+  unsigned long accumulator = 0;
 
   while (running) {
     // Process all pending input immediately (non-blocking) before each frame
@@ -422,12 +417,21 @@ int main() {
     if (!running) break;
 
     unsigned long now = now_ms();
+    unsigned long elapsed = now - lastFrame;
+    lastFrame = now;
 
-    // Game logic step at its own rate
-    if (now >= nextTick) {
+    // 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();
-      if (nextTick < now) nextTick = now;
-      nextTick += (state == PLAYING ? speed : 80);
+      accumulator -= speed;
+      steps++;
     }
 
     // Render every frame
@@ -435,8 +439,8 @@ int main() {
 
     // 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) {
+    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;
@@ -445,7 +449,6 @@ int main() {
       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 48ebfd1..def1d2a 100644
--- a/src/games/tetris.cpp
+++ b/src/games/tetris.cpp
@@ -97,8 +97,6 @@ static unsigned long C_GB_DARK, C_GB_MED, C_GB_LIGHT, C_GB_PALE;
 
 // ---- tetromino definitions (state 0 within a 4x4 box) ----
 // type 0..6 -> I,O,T,S,Z,J,L
-// 7 tetrominoes, each with 4 explicit rotation states (classic SRS-style).
-// type 0..6 -> I,O,T,S,Z,J,L. Coordinates are within a 4x4 box [x,y].
 static const int SHAPES[7][4][4][2] = {
   { {{0,1},{1,1},{2,1},{3,1}}, {{2,0},{2,1},{2,2},{2,3}}, {{0,2},{1,2},{2,2},{3,2}}, {{1,0},{1,1},{1,2},{1,3}} }, // I
   { {{1,0},{2,0},{1,1},{2,1}}, {{1,0},{2,0},{1,1},{2,1}}, {{1,0},{2,0},{1,1},{2,1}}, {{1,0},{2,0},{1,1},{2,1}} }, // O
@@ -117,7 +115,6 @@ static int nextType = 0;
 static int score = 0, best = 0, lines = 0, level = 1;
 static int speed = 600;  // ms per gravity step (derived from pps below)
 static int pps = 23;     // base speed px/sec; +1 px/sec per 10 lines cleared
-static unsigned long nextTick = 0;
 static bool running = true;
 
 static void piece_cells(int type, int rot, int out[4][2]) {
@@ -165,7 +162,6 @@ static void spawn() {
     state = GAMEOVER;
     if (score > best) best = score;
   }
-  nextTick = now_ms() + speed;
 }
 
 static void lock_piece() {
@@ -337,15 +333,15 @@ static void render() {
   int boxY = py0 + 10;
   int boxH = 52;
   XSetForeground(dpy, gc, C_DIM);
-  XDrawRectangle(dpy, back, gc, sx - 2, boxY + 1, winW - sx - 3, boxH);  // frame 2px left, 1px down, 1px wider (piece unchanged)
+  XDrawRectangle(dpy, back, gc, sx - 2, boxY + 1, winW - sx - 3, boxH);
   int nc[4][2];
   piece_cells(nextType, 0, nc);
   int minx = 4, miny = 4, maxx = -1, maxy = -1;
   for (int i = 0; i < 4; i++) {
     minx = nc[i][0] < minx ? nc[i][0] : minx;
-    miny = nc[i][1] < miny ? miny : miny;
+    miny = nc[i][1] < miny ? nc[i][1] : miny;
     maxx = nc[i][0] > maxx ? nc[i][0] : maxx;
-    maxy = nc[i][1] > maxy ? maxy : maxy;
+    maxy = nc[i][1] > maxy ? nc[i][1] : maxy;
   }
   int pcell = 11;                       // larger next-piece preview
   int pcols = maxx - minx + 1;
@@ -475,14 +471,14 @@ static void handle_key(KeySym ks) {
       if (state == PLAYING) {
         state = PAUSED;
       } else if (state == PAUSED) {
-        state = PLAYING; nextTick = now_ms() + speed;
+        state = PLAYING;
       }
       break;
     case XK_5: case XK_Return: case XK_KP_Enter:
       if (state == PLAYING) {
         hard_drop();
       } else if (state == PAUSED) {
-        state = PLAYING; nextTick = now_ms() + speed;
+        state = PLAYING;
       } else if (state == GAMEOVER) {
         reset_game();
       }
@@ -521,7 +517,8 @@ int main() {
 
   int xfd = ConnectionNumber(dpy);
   const unsigned long FRAME_MS = 1000 / 30;  // 30 fps rendering
-  unsigned long frameStart = now_ms();
+  unsigned long lastFrame = now_ms();
+  unsigned long accumulator = 0;
 
   while (running) {
     // Process all pending input immediately (non-blocking) before each frame
@@ -534,12 +531,21 @@ int main() {
     if (!running) break;
 
     unsigned long now = now_ms();
+    unsigned long elapsed = now - lastFrame;
+    lastFrame = now;
 
-    // Game logic step at its own rate
-    if (now >= nextTick) {
+    // 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();
-      if (nextTick < now) nextTick = now;
-      nextTick += (state == PLAYING ? speed : 80);
+      accumulator -= speed;
+      steps++;
     }
 
     // Render every frame
@@ -547,8 +553,8 @@ int main() {
 
     // 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) {
+    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;
@@ -557,7 +563,6 @@ int main() {
       FD_SET(xfd, &fds);
       select(xfd + 1, &fds, nullptr, nullptr, &tv);
     }
-    frameStart = now_ms();
   }
 
   XFreeGC(dpy, gc);