From fdcdb8968494432f4a041e9180eae4ff4172bc5b Mon Sep 17 00:00:00 2001
From: Luxferre <lux@ferre>
Date: Fri, 23 Oct 2026 20:17:15 +0300
Subject: [PATCH] games: progressive difficulty + Tetris controls panel

Snake: speed derived from pixels/second; +1 px/sec per 5 food eaten
(pps = 70 + food/5, step = cell*1000/pps, floored at 40ms).

Tetris: speed derived from pixels/second; +1 px/sec per 10 lines cleared
(pps = 23 + lines/10, step = CELL*1000/pps, floored at 40ms), replacing
the old level-driven formula. Level still drives the score multiplier.

Tetris: list all controls concisely in the free space of the right panel
(KEYS, 4/6 MOVE, 2 ROTATE, 8 SOFT, 0 DROP, # PAUSE, 5 OK).
---
 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           |  20 +++++++++++++++-----
 src/games/tetris.cpp          |  30 +++++++++++++++++++++++++-----
 6 files changed, 40 insertions(+), 10 deletions(-)

diff --git a/overlay/rootfs/usr/bin/snake b/overlay/rootfs/usr/bin/snake
index 6b11ff99886c7c986e16bed83bbd53a097c43bcd..a77184b9e589e03cb2a892d794acbff208d473c3 100755
GIT binary patch
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diff --git a/overlay/rootfs/usr/bin/tetris b/overlay/rootfs/usr/bin/tetris
index b703e0bd846567d03c564e5cdf270dfd2ea3662a..76d4023b62875460624486b1e88cf4ba0072d25b 100755
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delta 3706
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diff --git a/prebuilt/games/usr/bin/snake b/prebuilt/games/usr/bin/snake
index 6b11ff99886c7c986e16bed83bbd53a097c43bcd..a77184b9e589e03cb2a892d794acbff208d473c3 100755
GIT binary patch
delta 3471
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diff --git a/prebuilt/games/usr/bin/tetris b/prebuilt/games/usr/bin/tetris
index b703e0bd846567d03c564e5cdf270dfd2ea3662a..76d4023b62875460624486b1e88cf4ba0072d25b 100755
GIT binary patch
delta 3867
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diff --git a/src/games/snake.cpp b/src/games/snake.cpp
index e4fa960..0fe1128 100644
--- a/src/games/snake.cpp
+++ b/src/games/snake.cpp
@@ -101,7 +101,8 @@ static int ndirx = 1, ndiry = 0;   // buffered next direction
 static int foodx, foody;
 static int score = 0;
 static int best = 0;
-static int speed = 130;            // ms per step (speeds up with score)
+static int speed = 130;            // ms per step (derived from pps below)
+static int pps = 70;               // 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() {
@@ -110,6 +111,14 @@ static unsigned long now_ms() {
   return (unsigned long)(tv.tv_sec * 1000 + tv.tv_usec / 1000);
 }
 
+// Derive the per-step delay (ms) from the target pixels/second. The snake
+// advances one cell (cell pixels) per step, so step time = cell / pps.
+static void update_speed() {
+  int ms = (cell * 1000) / pps;
+  if (ms < 40) ms = 40;            // cap so the snake never becomes uncontrollable
+  speed = ms;
+}
+
 static void compute_grid() {
   int m = 2;
   int topH = 14; // reserved status strip for SCORE/BEST
@@ -151,7 +160,8 @@ static void reset_game() {
   dirx = 1; diry = 0;
   ndirx = 1; ndiry = 0;
   score = 0;
-  speed = 130;
+  pps = 70;
+  update_speed();
   place_food();
   state = PLAYING;
   nextTick = now_ms() + speed;
@@ -184,9 +194,9 @@ static void step() {
   if (ate) {
     score += 10;
     if (score > best) best = score;
-    int ns = 130 - (score / 50) * 8;
-    if (ns < 60) ns = 60;
-    speed = ns;
+    int food = score / 10;        // food items eaten so far
+    pps = 70 + food / 5;          // +1 px/sec per 5 food eaten (progressive difficulty)
+    update_speed();
     place_food();
   }
   nextTick = now_ms() + speed;
diff --git a/src/games/tetris.cpp b/src/games/tetris.cpp
index 9648231..bc6be0c 100644
--- a/src/games/tetris.cpp
+++ b/src/games/tetris.cpp
@@ -109,7 +109,8 @@ static int board[PCOLS][PROWS]; // 0 empty, else type+1
 static int curType = 0, curRot = 0, curX = 3, curY = 0;
 static int nextType = 0;
 static int score = 0, best = 0, lines = 0, level = 1;
-static int speed = 1000; // ms per gravity step
+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;
 
@@ -137,6 +138,15 @@ static unsigned long now_ms() {
   return (unsigned long)(tv.tv_sec * 1000 + tv.tv_usec / 1000);
 }
 
+// Derive the gravity delay (ms) from the target pixels/second. A piece drops
+// one cell (CELL pixels) per gravity step, so step time = CELL / pps.
+static void update_speed() {
+  pps = 23 + lines / 10;          // +1 px/sec per 10 cleared lines (progressive difficulty)
+  int ms = (CELL * 1000) / pps;
+  if (ms < 40) ms = 40;           // floor on gravity so it stays playable
+  speed = ms;
+}
+
 static void spawn() {
   curType = nextType;
   nextType = rand() % 7;
@@ -176,11 +186,11 @@ static void lock_piece() {
   }
   if (cleared > 0) {
     lines += cleared;
+    level = 1 + lines / 10;
     int pts[5] = {0, 100, 300, 500, 800};
     score += pts[cleared] * level;
     if (score > best) best = score;
-    int nl = 1 + lines / 10;
-    if (nl != level) { level = nl; speed = 1000 - (level - 1) * 40; if (speed < 300) speed = 300; }
+    update_speed();   // +1 px/sec per 10 cleared lines
   }
   spawn();
 }
@@ -227,7 +237,7 @@ static void try_rotate() {
 
 static void reset_game() {
   for (int x = 0; x < PCOLS; x++) for (int y = 0; y < PROWS; y++) board[x][y] = 0;
-  score = 0; lines = 0; level = 1; speed = 600;
+  score = 0; lines = 0; level = 1; update_speed();
   nextType = rand() % 7;
   spawn();
   state = PLAYING;
@@ -319,6 +329,16 @@ static void render() {
   snprintf(buf, sizeof(buf), "LEVEL %d", level); draw_text(sx, ty + 18, 1, C_DIM, buf);
   if (best > 0) { snprintf(buf, sizeof(buf), "BEST %d", best); draw_text(sx, ty + 27, 1, C_DIM, buf); }
 
+  // concise controls in the free space below the stats
+  int ky = ty + 27 + 12;
+  draw_text(sx, ky, 1, C_DIM, "KEYS");
+  draw_text(sx, ky + 9, 1, C_DIM, "4/6 MOVE");
+  draw_text(sx, ky + 18, 1, C_DIM, "2 ROTATE");
+  draw_text(sx, ky + 27, 1, C_DIM, "8 SOFT");
+  draw_text(sx, ky + 36, 1, C_DIM, "0 DROP");
+  draw_text(sx, ky + 45, 1, C_DIM, "# PAUSE");
+  draw_text(sx, ky + 54, 1, C_DIM, "5 OK");
+
   if (state == PAUSED || state == GAMEOVER) {
     XSetForeground(dpy, gc, C_BG);
     XFillRectangle(dpy, back, gc, 0, 0, winW, winH);
@@ -352,7 +372,7 @@ static void setup_window() {
   if (winW < 96) winW = 96;
   if (winH < 96) winH = 96;
   win = XCreateWindow(dpy, RootWindow(dpy, screen), bw, TOPBAR + bw, winW, winH, 0,
-                       CopyFromParent, InputOutput, CopyFromParent, 0, nullptr);
+                        CopyFromParent, InputOutput, CopyFromParent, 0, nullptr);
   XStoreName(dpy, win, "Tetris");
   XClassHint* ch = XAllocClassHint();
   if (ch) { ch->res_name = (char*)"tetris"; ch->res_class = (char*)"tetris"; XSetClassHint(dpy, win, ch); XFree(ch); }