From 4e09bca9e34c226b6d7e34b4fa11248405fd988e Mon Sep 17 00:00:00 2001
From: Anton Kling <anton@kling.gg>
Date: Sun, 22 Oct 2023 19:50:38 +0200
Subject: Move everything into a new repo.

---
 userland/snake/snake.c | 109 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 userland/snake/snake.c

(limited to 'userland/snake/snake.c')

diff --git a/userland/snake/snake.c b/userland/snake/snake.c
new file mode 100644
index 0000000..7bfb312
--- /dev/null
+++ b/userland/snake/snake.c
@@ -0,0 +1,109 @@
+#include <assert.h>
+#include <fcntl.h>
+#include <json.h>
+#include <libgui.h>
+#include <poll.h>
+#include <pty.h>
+#include <socket.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+GUI_Window *global_w;
+
+#define SNAKE_WIDTH 10
+
+int get_key_event(char *c) {
+  if (0 >= read(global_w->ws_socket, c, 1))
+    return 0;
+  if (0 == *c)
+    return 0;
+  return 1;
+}
+
+void draw_snake(int x, int y) {
+  int sx = global_w->sx;
+  uint32_t *b = &global_w->bitmap_ptr[y * sx + x];
+  for (int i = 0; i < SNAKE_WIDTH; i++) {
+    for (int j = 0; j < SNAKE_WIDTH; j++) {
+      b[j] = 0xFF00FF;
+    }
+    b += sx;
+  }
+}
+
+int clamp(int *x, int *y) {
+  int clamped = 0;
+  if (*x + SNAKE_WIDTH > global_w->sx) {
+    *x = global_w->sx - SNAKE_WIDTH;
+    clamped = 1;
+  }
+  if (*y + SNAKE_WIDTH > global_w->sy) {
+    *y = global_w->sy - SNAKE_WIDTH;
+    clamped = 1;
+  }
+  return clamped;
+}
+
+void loop() {
+  int vel = SNAKE_WIDTH;
+  static int y_dir = SNAKE_WIDTH;
+  static int x_dir = 0;
+  static int snake_x = 10;
+  static int snake_y = 10;
+  static int ticks = 0;
+  ticks++;
+  char c;
+  if (get_key_event(&c)) {
+    switch (c) {
+    case 'w':
+      y_dir = -1 * vel;
+      x_dir = 0;
+      break;
+    case 's':
+      y_dir = vel;
+      x_dir = 0;
+      break;
+    case 'a':
+      x_dir = -1 * vel;
+      y_dir = 0;
+      break;
+    case 'd':
+      x_dir = vel;
+      y_dir = 0;
+      break;
+    case 'q':
+      exit(0);
+      break;
+    default:
+      break;
+    }
+  }
+
+  if (!(ticks > 5))
+    return;
+  ticks = 0;
+
+  snake_x += x_dir;
+  snake_y += y_dir;
+  if (clamp(&snake_x, &snake_y))
+    return;
+  draw_snake(snake_x, snake_y);
+  if (y_dir || x_dir)
+    GUI_UpdateWindow(global_w);
+}
+
+int main(void) {
+  global_w = GUI_CreateWindow(10, 10, 150 * 4, 150 * 4);
+  assert(global_w);
+  for (int i = 0; i < 150 * 150 * 4 * 4; i++)
+    global_w->bitmap_ptr[i] = 0xFFFFFF;
+  GUI_UpdateWindow(global_w);
+  for (;;) {
+    loop();
+    msleep(50);
+  }
+  return 0;
+}
-- 
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