3D Raycasting на PHP.

Конвертирован нейронной сетью из кода C.
Алгоритм рабочий.
<?php
session_start();

// Размеры карты и параметры
define('MAP_WIDTH', 16);
define('MAP_HEIGHT', 16);
define('SCREEN_WIDTH', 60);
define('SCREEN_HEIGHT', 24);
define('FOV', M_PI / 3.0);
define('MAX_DEPTH', 16.0);

// Карта
$worldMap = [
[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,1,1,1,0,0,1,1,1,0,0,0,1],
[1,0,0,0,1,0,1,0,0,1,0,1,0,0,0,1],
[1,0,0,0,1,1,1,0,0,1,1,1,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1]
];

// Инициализация или получение состояния игрока
if (!isset($_SESSION['playerX'])) {
$_SESSION['playerX'] = 3.0;
$_SESSION['playerY'] = 3.0;
$_SESSION['playerAngle'] = 0.0;
}

// Обработка команд
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
$command = $_POST['command'] ?? '';

$playerX = &$_SESSION['playerX'];
$playerY = &$_SESSION['playerY'];
$playerAngle = &$_SESSION['playerAngle'];

$newX = $playerX;
$newY = $playerY;

switch ($command) {
case 'W':
case 'w':
$newX = $playerX + cos($playerAngle) * 0.2;
$newY = $playerY + sin($playerAngle) * 0.2;
if ($worldMap[(int)$newY][(int)$newX] === 0) {
$playerX = $newX;
$playerY = $newY;
}
break;
case 'S':
case 's':
$newX = $playerX - cos($playerAngle) * 0.2;
$newY = $playerY - sin($playerAngle) * 0.2;
if ($worldMap[(int)$newY][(int)$newX] === 0) {
$playerX = $newX;
$playerY = $newY;
}
break;
case 'A':
case 'a':
$playerAngle -= 0.1;
break;
case 'D':
case 'd':
$playerAngle += 0.1;
break;
}
}

// Функция рисования
function draw() {
global $worldMap, $_SESSION;

$playerX = $_SESSION['playerX'];
$playerY = $_SESSION['playerY'];
$playerAngle = $_SESSION['playerAngle'];


for ($y = 0; $y < SCREEN_HEIGHT; $y++) {
for ($x = 0; $x < SCREEN_WIDTH; $x++) {
$rayAngle = ($playerAngle - FOV / 2) + (($x / SCREEN_WIDTH) * FOV);
$distanceToWall = 0.0;
$hit = false;

while (!$hit && $distanceToWall < MAX_DEPTH) {
$distanceToWall += 0.1;
$rayX = (int)($playerX + cos($rayAngle) * $distanceToWall);
$rayY = (int)($playerY + sin($rayAngle) * $distanceToWall);

if ($rayX < 0 || $rayX >= MAP_WIDTH || $rayY < 0 || $rayY >= MAP_HEIGHT) {
$hit = true;
$distanceToWall = MAX_DEPTH;
} else {
if ($worldMap[$rayY][$rayX] == 1) {
$hit = true;
}
}
}

$angleDiff = $rayAngle - $playerAngle;
if ($angleDiff > M_PI) $angleDiff -= 2 * M_PI;
if ($angleDiff < -M_PI) $angleDiff += 2 * M_PI;

$ceiling = (int)((SCREEN_HEIGHT / 2.0) - SCREEN_HEIGHT / $distanceToWall);
$floor = SCREEN_HEIGHT - $ceiling;

if ($y < $ceiling) {
$output .= " ";
} elseif ($y > $ceiling && $y <= $floor) {
if ($distanceToWall <= MAX_DEPTH / 4.0) {
$output .= "#";
} elseif ($distanceToWall < MAX_DEPTH / 2.0) {
$output .= "+";
} else {
$output .= ".";
}
} else {
$output .= " ";
}
}
$output .= "\n";
}
return $output;
}

?>

<!DOCTYPE html>
<html lang="ru">
<head>
<meta charset="UTF-8" />
<title>3D Raycasting</title>
</head>
<body style="font-family: monospace; white-space: pre;">
<h2>3D Raycasting на PHP</h2>
<pre>
<?php echo draw(); ?>
</pre>
<form method="post">
<button name="command" value="W">Вперед (W)</button>
<button name="command" value="S">Назад (S)</button>
<button name="command" value="A">Поворот налево (A)</button>
<button name="command" value="D">Поворот направо (D)</button>
<button type="submit" name="command" value="exit">Выход</button>
</form>
</body>
</html>