sdl3/examples/multi_process_windows.php

<?php

/**
 * Multi-Process Window Example
 *
 * Each window runs in a separate process (not thread!)
 * This works because each process has its own main thread for OpenGL
 */

require_once __DIR__ . '/../vendor/autoload.php';

use PHPNative\Framework\Application;
use PHPNative\Ui\Widget\Button;
use PHPNative\Ui\Widget\Container;
use PHPNative\Ui\Widget\Label;

// Check if we're the main process or a child
$windowId = $argv[1] ?? null;

if ($windowId === null) {
    // MAIN PROCESS - Launch child processes
    echo "Main Process: Launching 2 window processes...\n\n";

    $pids = [];

    // Launch Window 1 process
    $pid1 = pcntl_fork();
    if ($pid1 == -1) {
        die("Could not fork for Window 1\n");
    } elseif ($pid1 == 0) {
        // Child process 1
        runWindow('1', 'Window 1 - Blue', 100, 100, 'blue');
        exit(0);
    } else {
        $pids[] = $pid1;
        echo "Main Process: Window 1 started with PID $pid1\n";
    }

    // Small delay to avoid race conditions
    usleep(100000);

    // Launch Window 2 process
    $pid2 = pcntl_fork();
    if ($pid2 == -1) {
        die("Could not fork for Window 2\n");
    } elseif ($pid2 == 0) {
        // Child process 2
        runWindow('2', 'Window 2 - Green', 550, 100, 'green');
        exit(0);
    } else {
        $pids[] = $pid2;
        echo "Main Process: Window 2 started with PID $pid2\n";
    }

    echo "\nMain Process: Both windows launched!\n";
    echo "Main Process: Waiting for child processes to exit...\n\n";

    // Wait for all child processes
    foreach ($pids as $pid) {
        $status = 0;
        pcntl_waitpid($pid, $status);
        echo "Main Process: Child process $pid exited\n";
    }

    echo "\nMain Process: All windows closed. Exiting.\n";
} else {
    // This shouldn't happen in fork mode
    die("Error: Unexpected command line argument\n");
}

/**
 * Run a single window in this process
 */
function runWindow(string $id, string $title, int $x, int $y, string $bgColor): void
{
    echo "Process $id: Creating window '$title'\n";

    // Create application
    $app = new Application();

    // Create window
    $window = $app->createWindow($title, 400, 350, $x, $y);

    // Create UI
    $container = new Container("flex flex-col p-6 gap-4 bg-$bgColor-100");

    $titleLabel = new Label(
        text: $title,
        style: "text-2xl text-$bgColor-900"
    );

    $processLabel = new Label(
        text: 'Process ID: ' . getmypid(),
        style: "text-sm text-$bgColor-700"
    );

    $frameLabel = new Label(
        text: 'Frame: 0',
        style: "text-base text-$bgColor-600"
    );

    $button = new Button(
        text: 'Click Me!',
        style: "bg-$bgColor-500 hover:bg-$bgColor-700 text-white p-4 rounded-lg"
    );

    $clickCount = 0;
    $button->setOnClick(function() use (&$clickCount, $button, $title) {
        $clickCount++;
        $button->setText("Clicked $clickCount times");
        echo "$title - Button clicked! Count: $clickCount\n";
    });

    $closeButton = new Button(
        text: 'Close Window',
        style: "bg-red-500 hover:bg-red-700 text-white p-3 rounded"
    );

    $closeButton->setOnClick(function() use ($window) {
        echo "Close button clicked!\n";
        $window->close();
    });

    $container->addComponent($titleLabel);
    $container->addComponent($processLabel);
    $container->addComponent($frameLabel);
    $container->addComponent($button);
    $container->addComponent($closeButton);

    $window->setRoot($container);

    echo "Process $id: Starting event loop\n";

    // Run the window
    $frameCount = 0;
    while (!$window->shouldClose()) {
        $frameCount++;
        $frameLabel->setText("Frame: $frameCount");

        $window->layout();

        // Poll events
        rgfw_pollEvents();
        $window->handleEvents();

        // Update
        \PHPNative\Async\TaskManager::getInstance()->update();
        $window->update();

        // Render
        $window->render();

        // ~60 FPS
        usleep(16666);
    }

    // Cleanup
    echo "Process $id: Window closed after $frameCount frames\n";
    $window->cleanup();
}