> compile NEMU

ysyx_22040000 李心杨
Linux calcite 6.6.19 #1-NixOS SMP PREEMPT_DYNAMIC Fri Mar  1 12:35:11 UTC 2024 x86_64 GNU/Linux
 16:26:21  up 4 days  3:32,  2 users,  load average: 0.85, 0.91, 0.95

am-kernels/kernels/demo/src/galton/galton.c

@@ -0,0 +1,96 @@
+/* from http://rosettacode.org/wiki/Galton_box_animation#C */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <io.h>
+
+#define BALLS 1024
+#define N 8
+#define W (N * 2 + 1)
+#define H_MAX 50
+#define H_MIN 30
+static int h = 0;
+static int *x = NULL, *y = NULL, cnt = 0;
+static char *b = NULL;
+
+#define B(y, x) b[(y)*W + x]
+#define C(y, x) ' ' == b[(y)*W + x]
+#define V(i) B(y[i], x[i])
+static int rnd(int a) { return rand() % a; }
+
+static void show_board() {
+  int i, j;
+  for (i = 0; i < h; i++)
+    for (j = 0; j < W; j++) {
+      if (B(i, j) == '*') {
+        set_color(C(i - 1, j) ? ANSI_COLOR_GREEN : ANSI_COLOR_RED);
+        print_char(B(i, j), i, 2 * j);
+        set_color(ANSI_COLOR_RESET);
+      } else {
+        print_char(B(i, j), i, 2 * j);
+      }
+      print_char(' ', i, 2 * j + 1);
+    }
+  screen_refresh();
+}
+
+static void init() {
+  int i, j;
+  screen_clear();
+  b = malloc(W * h);
+  memset(b, ' ', W * h);
+
+  x = malloc(sizeof(int) * BALLS * 2);
+  y = x + BALLS;
+
+  for (i = 0; i < N; i++)
+    for (j = -i; j <= i; j += 2)
+      B(2 * i+2, j + W/2) = '*';
+}
+
+static void move(int idx) {
+  int xx = x[idx], yy = y[idx], c, kill = 0, sl = 3, o = 0;
+
+  if (yy < 0) return;
+  if (yy == h - 1) { y[idx] = -1; return; }
+
+  switch(c = B(yy + 1, xx)) {
+    case ' ':	yy++; break;
+    case '*':	sl = 1;
+    default:	if (xx < W - 1 && C(yy, xx + 1) && C(yy + 1, xx + 1))
+                if (!rnd(sl++)) o = 1;
+              if (xx && C(yy, xx - 1) && C(yy + 1, xx - 1))
+                if (!rnd(sl++)) o = -1;
+              if (!o) kill = 1;
+              xx += o;
+  }
+
+  c = V(idx); V(idx) = ' ';
+  idx[y] = yy, idx[x] = xx;
+  B(yy, xx) = c;
+  if (kill) idx[y] = -1;
+}
+
+static int run(void) {
+  static int step = 0;
+  int i;
+  for (i = 0; i < cnt; i++) move(i);
+  if (2 == ++step && cnt < BALLS) {
+    step = 0;
+    x[cnt] = W/2;
+    y[cnt] = 0;
+    if (V(cnt) != ' ') return 0;
+    V(cnt) = rnd(80) + 43;
+    cnt++;
+  }
+  return 1;
+}
+
+void galton() {
+  h = screen_tile_height() - 2;
+  if (h > H_MAX) h = H_MAX;
+  if (h < H_MIN) h = H_MIN;
+  init();
+  do { show_board(), usleep(6000); } while (run());
+}