From 1dd9fac3136a68e74d265b8ffb178248f42caa01 Mon Sep 17 00:00:00 2001
From: Luxferre <lux@ferre>
Date: Fri, 23 Oct 2026 15:47:30 +0300
Subject: [PATCH] fix(games): correct Tetris rotation, fix input/render lag,
 visible window frame

- Tetris: replace pivot-based rotation with explicit 4-state SHAPES
  table (classic SRS-style) so rotation is correct and the O piece no
  longer drifts on rotate; keep simple wall-kick offsets.
- Both: render immediately after processing input (not only on gravity
  steps) so rotation/movement is no longer laggy.
- Both: draw the window frame inset by 2-3px (double line) so the right
  and bottom edges are actually visible instead of clipped at the edge.
---
 overlay/rootfs/usr/bin/snake  | Bin 13672 -> 13672 bytes
 overlay/rootfs/usr/bin/tetris | Bin 13668 -> 13668 bytes
 prebuilt/games/usr/bin/snake  | Bin 13672 -> 13672 bytes
 prebuilt/games/usr/bin/tetris | Bin 13668 -> 13668 bytes
 src/games/snake.cpp           |   8 +++--
 src/games/tetris.cpp          |  58 +++++++++++++++++++---------------
 6 files changed, 38 insertions(+), 28 deletions(-)

diff --git a/overlay/rootfs/usr/bin/snake b/overlay/rootfs/usr/bin/snake
index 8b4621c83f9298570e2b058c4ac5a7952a0b0a5f..5553412e604921e938301e14badcd88fca59251b 100755
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diff --git a/overlay/rootfs/usr/bin/tetris b/overlay/rootfs/usr/bin/tetris
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diff --git a/prebuilt/games/usr/bin/snake b/prebuilt/games/usr/bin/snake
index 8b4621c83f9298570e2b058c4ac5a7952a0b0a5f..5553412e604921e938301e14badcd88fca59251b 100755
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diff --git a/prebuilt/games/usr/bin/tetris b/prebuilt/games/usr/bin/tetris
index d893b1fa2909db5f1f27f9dcc452cdcfc2e0402f..e89787bb6bdb9c78b6f4108507189adfff5a8f94 100755
GIT binary patch
delta 5240
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diff --git a/src/games/snake.cpp b/src/games/snake.cpp
index 7fc5353..7cc8832 100644
--- a/src/games/snake.cpp
+++ b/src/games/snake.cpp
@@ -219,7 +219,8 @@ static void render() {
 
   // frame the whole window (right/bottom edges too)
   XSetForeground(dpy, gc, C_DIM);
-  XDrawRectangle(dpy, back, gc, 0, 0, winW - 1, winH - 1);
+  XDrawRectangle(dpy, back, gc, 2, 2, winW - 4, winH - 4);
+  XDrawRectangle(dpy, back, gc, 3, 3, winW - 6, winH - 6);
 
   // food
   if (foodx >= 0) {
@@ -363,6 +364,7 @@ int main() {
     FD_ZERO(&fds);
     FD_SET(xfd, &fds);
     int r = select(xfd + 1, &fds, nullptr, nullptr, &tv);
+    bool dirty = false;
     if (r > 0) {
       XEvent e;
       while (XPending(dpy)) {
@@ -371,13 +373,15 @@ int main() {
         if (!running) break;
       }
       if (!running) break;
+      dirty = true;
     }
     if (running && now_ms() >= nextTick) {
       if (state == PLAYING) step();
       if (state == PLAYING) nextTick = now_ms() + speed;
       else nextTick = now_ms() + 80; // keep loop responsive while paused/over
-      render();
+      dirty = true;
     }
+    if (dirty) render();
   }
 
   XFreeGC(dpy, gc);
diff --git a/src/games/tetris.cpp b/src/games/tetris.cpp
index cd130a1..4adf8f3 100644
--- a/src/games/tetris.cpp
+++ b/src/games/tetris.cpp
@@ -92,14 +92,16 @@ static unsigned long C_BG, C_FG, C_HEAD, C_FOOD, C_DIM;
 
 // ---- tetromino definitions (state 0 within a 4x4 box) ----
 // type 0..6 -> I,O,T,S,Z,J,L
-static const int BASE[7][4][2] = {
-  {{0,1},{1,1},{2,1},{3,1}}, // I
-  {{1,0},{2,0},{1,1},{2,1}}, // O
-  {{1,0},{0,1},{1,1},{2,1}}, // T
-  {{1,0},{2,0},{0,1},{1,1}}, // S
-  {{0,0},{1,0},{1,1},{2,1}}, // Z
-  {{0,0},{0,1},{1,1},{2,1}}, // J
-  {{2,0},{0,1},{1,1},{2,1}}, // 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
+  { {{1,0},{0,1},{1,1},{2,1}}, {{1,0},{1,1},{2,1},{1,2}}, {{0,1},{1,1},{2,1},{1,2}}, {{1,0},{0,1},{1,1},{1,2}} }, // T
+  { {{1,0},{2,0},{0,1},{1,1}}, {{1,0},{1,1},{2,1},{2,2}}, {{1,1},{2,1},{0,2},{1,2}}, {{0,0},{0,1},{1,1},{1,2}} }, // S
+  { {{0,0},{1,0},{1,1},{2,1}}, {{2,0},{1,1},{2,1},{1,2}}, {{0,1},{1,1},{1,2},{2,2}}, {{1,0},{0,1},{1,1},{0,2}} }, // Z
+  { {{0,0},{0,1},{1,1},{2,1}}, {{1,0},{2,0},{1,1},{1,2}}, {{0,1},{1,1},{2,1},{2,2}}, {{1,0},{1,1},{0,2},{1,2}} }, // J
+  { {{2,0},{0,1},{1,1},{2,1}}, {{1,0},{1,1},{1,2},{2,2}}, {{0,1},{1,1},{2,1},{0,2}}, {{0,0},{1,0},{1,1},{1,2}} }, // L
 };
 
 enum State { PLAYING, PAUSED, GAMEOVER };
@@ -112,16 +114,12 @@ static int speed = 1000; // ms per gravity step
 static unsigned long nextTick = 0;
 static bool running = true;
 
-static void rotate_cells(const int src[4][2], int dst[4][2], int times) {
-  for (int i = 0; i < 4; i++) {
-    int x = src[i][0], y = src[i][1];
-    for (int t = 0; t < times; t++) { int nx = 3 - y; int ny = x; x = nx; y = ny; }
-    dst[i][0] = x; dst[i][1] = y;
-  }
-}
-
 static void piece_cells(int type, int rot, int out[4][2]) {
-  rotate_cells(BASE[type], out, ((rot % 4) + 4) % 4);
+  int r = ((rot % 4) + 4) % 4;
+  for (int i = 0; i < 4; i++) {
+    out[i][0] = SHAPES[type][r][i][0];
+    out[i][1] = SHAPES[type][r][i][1];
+  }
 }
 
 static bool collide(int px, int py, int cells[4][2]) {
@@ -214,14 +212,18 @@ static void try_move(int dx) {
 }
 
 static void try_rotate() {
+  int nr = (curRot + 1) % 4;
   int cells[4][2];
-  piece_cells(curType, (curRot + 1) % 4, cells);
-  // simple wall kick: try shift left/right if blocked
-  if (!collide(curX, curY, cells)) { curRot = (curRot + 1) % 4; return; }
-  if (!collide(curX - 1, curY, cells)) { curX--; curRot = (curRot + 1) % 4; return; }
-  if (!collide(curX + 1, curY, cells)) { curX++; curRot = (curRot + 1) % 4; return; }
-  if (!collide(curX - 2, curY, cells)) { curX -= 2; curRot = (curRot + 1) % 4; return; }
-  if (!collide(curX + 2, curY, cells)) { curX += 2; curRot = (curRot + 1) % 4; return; }
+  piece_cells(curType, nr, cells);
+  // wall kicks: try in place, then small horizontal shifts
+  int kicks[5] = {0, -1, 1, -2, 2};
+  for (int k = 0; k < 5; k++) {
+    if (!collide(curX + kicks[k], curY, cells)) {
+      curX += kicks[k];
+      curRot = nr;
+      return;
+    }
+  }
 }
 
 static void reset_game() {
@@ -259,7 +261,8 @@ static void render() {
 
   // frame the whole window (right/bottom edges too)
   XSetForeground(dpy, gc, C_DIM);
-  XDrawRectangle(dpy, back, gc, 0, 0, winW - 1, winH - 1);
+  XDrawRectangle(dpy, back, gc, 2, 2, winW - 4, winH - 4);
+  XDrawRectangle(dpy, back, gc, 3, 3, winW - 6, winH - 6);
 
   // settled blocks
   for (int x = 0; x < PCOLS; x++)
@@ -445,6 +448,7 @@ int main() {
     FD_ZERO(&fds);
     FD_SET(xfd, &fds);
     int r = select(xfd + 1, &fds, nullptr, nullptr, &tv);
+    bool dirty = false;
     if (r > 0) {
       XEvent e;
       while (XPending(dpy)) {
@@ -453,13 +457,15 @@ int main() {
         if (!running) break;
       }
       if (!running) break;
+      dirty = true;
     }
     if (running && now_ms() >= nextTick) {
       if (state == PLAYING) step();
       if (state == PLAYING) nextTick = now_ms() + speed;
       else nextTick = now_ms() + 80;
-      render();
+      dirty = true;
     }
+    if (dirty) render();
   }
 
   XFreeGC(dpy, gc);