From 2a9136b2f3c82193a9a090b27d4e32b18c594c7e Mon Sep 17 00:00:00 2001 From: Eugen Wissner Date: Thu, 25 Dec 2025 12:01:15 +0100 Subject: =?UTF-8?q?=D0=97=D0=B0=D0=BA=D0=BE=D0=BD=D1=87=D0=B8=D0=BB=203-?= =?UTF-8?q?=D0=B5=20=D1=83=D0=BF=D1=80=D0=B0=D0=B6=D0=BD=D0=B5=D0=BD=D0=B8?= =?UTF-8?q?=D0=B5=204-=D0=B9=20=D0=B3=D0=BB=D0=B0=D0=B2=D1=8B?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../main/java/net/caraus/labyrinth/Location.java" | 8 + .../src/main/java/net/caraus/labyrinth/Main.java" | 62 +++++++ .../src/main/java/net/caraus/labyrinth/Maze.java" | 84 +++++++++ .../src/main/java/net/caraus/labyrinth/Point.java" | 4 + .../java/net/caraus/labyrinth/RecursiveSolve.java" | 81 ++++++++ .../caraus/labyrinth/lwjgl3/Lwjgl3Launcher.java" | 45 +++++ .../caraus/labyrinth/lwjgl3/StartupHelper.java" | 204 +++++++++++++++++++++ .../3_recursive/src/main/resources/libgdx128.png" | Bin 0 -> 9545 bytes .../4/3_recursive/src/main/resources/libgdx16.png" | Bin 0 -> 806 bytes .../4/3_recursive/src/main/resources/libgdx32.png" | Bin 0 -> 2071 bytes .../4/3_recursive/src/main/resources/libgdx64.png" | Bin 0 -> 4929 bytes 11 files changed, 488 insertions(+) create mode 100644 "\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/Location.java" create mode 100644 "\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/Main.java" create mode 100644 "\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/Maze.java" create mode 100644 "\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/Point.java" create mode 100644 "\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/RecursiveSolve.java" create mode 100644 "\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/lwjgl3/Lwjgl3Launcher.java" create mode 100644 "\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/lwjgl3/StartupHelper.java" create mode 100644 "\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/resources/libgdx128.png" create mode 100644 "\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/resources/libgdx16.png" create mode 100644 "\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/resources/libgdx32.png" create mode 100644 "\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/resources/libgdx64.png" (limited to 'Занимательное программирование/4/3_recursive/src') diff --git "a/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/Location.java" "b/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/Location.java" new file mode 100644 index 0000000..b2f5a46 --- /dev/null +++ "b/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/Location.java" @@ -0,0 +1,8 @@ +package net.caraus.labyrinth; + +public record Location(boolean leftWall, boolean upWall) { + @Override + public String toString() { + return String.format("(%s, %s)", leftWall, upWall); + } +} diff --git "a/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/Main.java" "b/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/Main.java" new file mode 100644 index 0000000..2ef6adc --- /dev/null +++ "b/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/Main.java" @@ -0,0 +1,62 @@ +package net.caraus.labyrinth; + +import com.badlogic.gdx.ApplicationAdapter; +import com.badlogic.gdx.Gdx; +import com.badlogic.gdx.files.FileHandle; +import com.badlogic.gdx.graphics.glutils.ShapeRenderer; +import com.badlogic.gdx.graphics.Color; +import static com.badlogic.gdx.graphics.glutils.ShapeRenderer.ShapeType; +import com.badlogic.gdx.utils.ScreenUtils; + +import java.io.BufferedReader; +import java.io.IOException; + +/** {@link com.badlogic.gdx.ApplicationListener} implementation shared by all platforms. */ +public class Main extends ApplicationAdapter { + private ShapeRenderer shape; + private Maze maze; + private RecursiveSolve solver; + + @Override + public void create() { + shape = new ShapeRenderer(); + + FileHandle file = Gdx.files.internal("sample.txt"); + + try { + this.maze = new Maze(file.reader("utf-8")); + } catch (IOException e) { + } + this.solver = new RecursiveSolve(this.maze, new Point(0, 0), new Point(this.maze.width() - 1, 0)); + this.solver.start(); + } + + @Override + public void render() { + ScreenUtils.clear(0.15f, 0.15f, 0.2f, 1f); + + this.shape.begin(ShapeType.Line); + + this.shape.setColor(Color.RED); + this.maze.draw(this.shape); + + this.shape.setColor(Color.GREEN); + this.solver.draw(this.shape); + + /* this.elapsedTime += Gdx.graphics.getDeltaTime(); + if (this.elapsedTime > 1.0f) { + if (this.solver.solve() != Solution.CONTINUE) { + this.elapsedTime = Float.NEGATIVE_INFINITY; + } else { + this.elapsedTime -= 1.0f; + } + } */ + + this.shape.end(); + } + + @Override + public void dispose() { + this.shape.dispose(); + } +} diff --git "a/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/Maze.java" "b/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/Maze.java" new file mode 100644 index 0000000..eaeb72b --- /dev/null +++ "b/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/Maze.java" @@ -0,0 +1,84 @@ +package net.caraus.labyrinth; + +import com.badlogic.gdx.graphics.glutils.ShapeRenderer; +import com.badlogic.gdx.math.Vector2; + +import java.io.BufferedReader; +import java.io.Reader; +import java.io.IOException; + +public final class Maze { + private Location[][] maze; + + public static final int[] DX = {1, 0, -1, 0}; + public static final int[] DY = {0, -1, 0, 1}; + public static final float CELL_SIZE = 75.0f; + + public Maze(Reader inputReader) throws IOException { + BufferedReader reader = new BufferedReader(inputReader); + + String[] inputPair = reader.readLine().split(" "); + var width = Integer.parseInt(inputPair[0]); + var height = Integer.parseInt(inputPair[1]); + + this.maze = new Location[width + 1][height + 1]; + + for (var y = 0; y <= height; ++y) { + for (var x = 0; x <= width; ++x) { + if (y == height || x == width) { + this.maze[x][y] = new Location(true, true); + } else { + inputPair = reader.readLine().split(" "); + this.maze[x][y] = new Location(inputPair[1].equals("1"), inputPair[0].equals("1")); + } + } + } + } + + public int width() { + return this.maze == null ? 0 : this.maze.length - 1; + } + + public int height() { + return this.maze == null ? 0 : this.maze[0].length - 1; + } + + public void draw(ShapeRenderer shape) { + for (var x = 0; x < width(); ++x) { + for (var y = 0; y < height(); ++y) { + var start = new Vector2((x + 1) * CELL_SIZE, (height() - y + 1) * CELL_SIZE); + + if (this.maze[x][y].upWall()) { + var end = new Vector2(start).add(CELL_SIZE, 0); + + shape.line(start, end); + } + if (this.maze[x][y].leftWall()) { + var end = new Vector2(start).sub(0, CELL_SIZE); + + shape.line(start, end); + } + } + } + // Рисуем нижнюю и правую стены. + var edge = new Vector2(CELL_SIZE * (width() + 1), CELL_SIZE); + shape.line(new Vector2(CELL_SIZE, CELL_SIZE), edge); + shape.line(new Vector2(edge).add(0, height() * CELL_SIZE), edge); + } + + public boolean canGo(Point xy, int deltaIndex) { + if (DX[deltaIndex] == -1) { + return !this.maze[xy.x()][xy.y()].leftWall(); + } else if (DX[deltaIndex] == 1) { + return !this.maze[xy.x() + 1][xy.y()].leftWall(); + } else if (DY[deltaIndex] == -1) { + return !this.maze[xy.x()][xy.y()].upWall(); + } else { + return !this.maze[xy.x()][xy.y() + 1].upWall(); + } + } + + public Location at(Point xy) { + return this.maze[xy.x()][xy.y()]; + } +} diff --git "a/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/Point.java" "b/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/Point.java" new file mode 100644 index 0000000..6f70d4c --- /dev/null +++ "b/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/Point.java" @@ -0,0 +1,4 @@ +package net.caraus.labyrinth; + +public record Point(int x, int y) { +} diff --git "a/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/RecursiveSolve.java" "b/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/RecursiveSolve.java" new file mode 100644 index 0000000..73a2f25 --- /dev/null +++ "b/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/RecursiveSolve.java" @@ -0,0 +1,81 @@ +package net.caraus.labyrinth; + +import com.badlogic.gdx.graphics.glutils.ShapeRenderer; +import java.util.ArrayList; +import java.util.HashSet; + +public final class RecursiveSolve extends Thread { + private Maze maze; + private Point start; + private Point finish; + private boolean[][] visited; + + // Результирующий маршрут. + private ArrayList path; + + public RecursiveSolve(Maze maze, Point start, Point finish) { + this.maze = maze; + this.start = start; + this.finish = finish; + + this.visited = new boolean[this.maze.width()][this.maze.height()]; + this.path = new ArrayList<>(this.maze.width() * this.maze.height() + 1); + + for (var column: this.visited) { + for (var y = 0; y < column.length; ++y) { + column[y] = false; + } + } + } + + private boolean solve(Point nLocation) throws InterruptedException { + this.visited[nLocation.x()][nLocation.y()] = true; // Пометить локацию как посещенную. + synchronized(this) { + this.path.add(nLocation); // Добавить ее в описание маршрута. + } + Thread.sleep(500); + + // Если финишная локация найдена, конец алгоритма. + if (this.finish.equals(nLocation)) { + return true; + } + for (var i = 0; i < 4; ++i) { + // Если дорожка свободна, идем по ней. + var neighbour = new Point(nLocation.x() + Maze.DX[i], nLocation.y() + Maze.DY[i]); + + if (maze.canGo(nLocation, i) && !this.visited[neighbour.x()][neighbour.y()]) { + // Если решение найдено, конец алгоритма. + if (solve(neighbour)) { + return true; + } + } + } + synchronized(this) { + this.path.remove(this.path.size() - 1); + } + return false; + } + + @Override + public void run() { + try { + solve(this.start); + } catch (InterruptedException e) { + } + } + + private void drawPoint(ShapeRenderer shape, Point nLocation) { + final float markSize = 20.0f; + final float halfMark = Maze.CELL_SIZE / 2 - markSize / 2; + + shape.ellipse((nLocation.x() + 1) * Maze.CELL_SIZE + halfMark, + (this.maze.height() - nLocation.y()) * Maze.CELL_SIZE + halfMark, + markSize, markSize); + } + + synchronized public void draw(ShapeRenderer shape) { + for (var point: this.path) { + drawPoint(shape, point); + } + } +} diff --git "a/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/lwjgl3/Lwjgl3Launcher.java" "b/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/lwjgl3/Lwjgl3Launcher.java" new file mode 100644 index 0000000..d17ac8a --- /dev/null +++ "b/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/lwjgl3/Lwjgl3Launcher.java" @@ -0,0 +1,45 @@ +package net.caraus.labyrinth.lwjgl3; + +import com.badlogic.gdx.backends.lwjgl3.Lwjgl3Application; +import com.badlogic.gdx.backends.lwjgl3.Lwjgl3ApplicationConfiguration; +import net.caraus.labyrinth.Main; + +/** Launches the desktop (LWJGL3) application. */ +public class Lwjgl3Launcher { + public static void main(String[] args) { + if (StartupHelper.startNewJvmIfRequired()) return; // This handles macOS support and helps on Windows. + createApplication(); + } + + private static Lwjgl3Application createApplication() { + return new Lwjgl3Application(new Main(), getDefaultConfiguration()); + } + + private static Lwjgl3ApplicationConfiguration getDefaultConfiguration() { + Lwjgl3ApplicationConfiguration configuration = new Lwjgl3ApplicationConfiguration(); + configuration.setTitle("Labyrinth"); + //// Vsync limits the frames per second to what your hardware can display, and helps eliminate + //// screen tearing. This setting doesn't always work on Linux, so the line after is a safeguard. + configuration.useVsync(true); + //// Limits FPS to the refresh rate of the currently active monitor, plus 1 to try to match fractional + //// refresh rates. The Vsync setting above should limit the actual FPS to match the monitor. + configuration.setForegroundFPS(Lwjgl3ApplicationConfiguration.getDisplayMode().refreshRate + 1); + //// If you remove the above line and set Vsync to false, you can get unlimited FPS, which can be + //// useful for testing performance, but can also be very stressful to some hardware. + //// You may also need to configure GPU drivers to fully disable Vsync; this can cause screen tearing. + + configuration.setWindowedMode(640, 480); + //// You can change these files; they are in lwjgl3/src/main/resources/ . + //// They can also be loaded from the root of assets/ . + configuration.setWindowIcon("libgdx128.png", "libgdx64.png", "libgdx32.png", "libgdx16.png"); + + //// This should improve compatibility with Windows machines with buggy OpenGL drivers, Macs + //// with Apple Silicon that have to emulate compatibility with OpenGL anyway, and more. + //// This uses the dependency `com.badlogicgames.gdx:gdx-lwjgl3-angle` to function. + //// You can choose to remove the following line and the mentioned dependency if you want; they + //// are not intended for games that use GL30 (which is compatibility with OpenGL ES 3.0). + configuration.setOpenGLEmulation(Lwjgl3ApplicationConfiguration.GLEmulation.ANGLE_GLES20, 0, 0); + + return configuration; + } +} diff --git "a/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/lwjgl3/StartupHelper.java" "b/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/lwjgl3/StartupHelper.java" new file mode 100644 index 0000000..b62cf6f --- /dev/null +++ "b/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/java/net/caraus/labyrinth/lwjgl3/StartupHelper.java" @@ -0,0 +1,204 @@ +/* + * Copyright 2020 damios + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * https://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +//Note, the above license and copyright applies to this file only. + +package net.caraus.labyrinth.lwjgl3; + +import com.badlogic.gdx.Version; +import com.badlogic.gdx.backends.lwjgl3.Lwjgl3NativesLoader; +import org.lwjgl.system.macosx.LibC; +import org.lwjgl.system.macosx.ObjCRuntime; + +import java.io.BufferedReader; +import java.io.File; +import java.io.InputStreamReader; +import java.lang.management.ManagementFactory; +import java.util.ArrayList; + +import static org.lwjgl.system.JNI.invokePPP; +import static org.lwjgl.system.JNI.invokePPZ; +import static org.lwjgl.system.macosx.ObjCRuntime.objc_getClass; +import static org.lwjgl.system.macosx.ObjCRuntime.sel_getUid; + +/** + * Adds some utilities to ensure that the JVM was started with the + * {@code -XstartOnFirstThread} argument, which is required on macOS for LWJGL 3 + * to function. Also helps on Windows when users have names with characters from + * outside the Latin alphabet, a common cause of startup crashes. + *
+ * Based on this java-gaming.org post by kappa + * @author damios + */ +public class StartupHelper { + + private static final String JVM_RESTARTED_ARG = "jvmIsRestarted"; + + private StartupHelper() { + throw new UnsupportedOperationException(); + } + + /** + * Starts a new JVM if the application was started on macOS without the + * {@code -XstartOnFirstThread} argument. This also includes some code for + * Windows, for the case where the user's home directory includes certain + * non-Latin-alphabet characters (without this code, most LWJGL3 apps fail + * immediately for those users). Returns whether a new JVM was started and + * thus no code should be executed. + *

+ * Usage: + * + * 


+     * public static void main(String... args) {
+     * 	if (StartupHelper.startNewJvmIfRequired(true)) return; // This handles macOS support and helps on Windows.
+     * 	// after this is the actual main method code
+     * }
+     *
+ * + * @param redirectOutput + * whether the output of the new JVM should be rerouted to the + * old JVM, so it can be accessed in the same place; keeps the + * old JVM running if enabled + * @return whether a new JVM was started and thus no code should be executed + * in this one + */ + public static boolean startNewJvmIfRequired(boolean redirectOutput) { + String osName = System.getProperty("os.name").toLowerCase(java.util.Locale.ROOT); + if (!osName.contains("mac")) { + if (osName.contains("windows")) { +// Here, we are trying to work around an issue with how LWJGL3 loads its extracted .dll files. +// By default, LWJGL3 extracts to the directory specified by "java.io.tmpdir", which is usually the user's home. +// If the user's name has non-ASCII (or some non-alphanumeric) characters in it, that would fail. +// By extracting to the relevant "ProgramData" folder, which is usually "C:\ProgramData", we avoid this. +// We also temporarily change the "user.name" property to one without any chars that would be invalid. +// We revert our changes immediately after loading LWJGL3 natives. + String programData = System.getenv("ProgramData"); + if(programData == null) programData = "C:\\Temp\\"; // if ProgramData isn't set, try some fallback. + String prevTmpDir = System.getProperty("java.io.tmpdir", programData); + String prevUser = System.getProperty("user.name", "libGDX_User"); + System.setProperty("java.io.tmpdir", programData + "/libGDX-temp"); + System.setProperty("user.name", ("User_" + prevUser.hashCode() + "_GDX" + Version.VERSION).replace('.', '_')); + Lwjgl3NativesLoader.load(); + System.setProperty("java.io.tmpdir", prevTmpDir); + System.setProperty("user.name", prevUser); + } + return false; + } + + // There is no need for -XstartOnFirstThread on Graal native image + if (!System.getProperty("org.graalvm.nativeimage.imagecode", "").isEmpty()) { + return false; + } + + // Checks if we are already on the main thread, such as from running via Construo. + long objc_msgSend = ObjCRuntime.getLibrary().getFunctionAddress("objc_msgSend"); + long NSThread = objc_getClass("NSThread"); + long currentThread = invokePPP(NSThread, sel_getUid("currentThread"), objc_msgSend); + boolean isMainThread = invokePPZ(currentThread, sel_getUid("isMainThread"), objc_msgSend); + if(isMainThread) return false; + + long pid = LibC.getpid(); + + // check whether -XstartOnFirstThread is enabled + if ("1".equals(System.getenv("JAVA_STARTED_ON_FIRST_THREAD_" + pid))) { + return false; + } + + // check whether the JVM was previously restarted + // avoids looping, but most certainly leads to a crash + if ("true".equals(System.getProperty(JVM_RESTARTED_ARG))) { + System.err.println( + "There was a problem evaluating whether the JVM was started with the -XstartOnFirstThread argument."); + return false; + } + + // Restart the JVM with -XstartOnFirstThread + ArrayList jvmArgs = new ArrayList<>(); + String separator = System.getProperty("file.separator", "/"); + // The following line is used assuming you target Java 8, the minimum for LWJGL3. + String javaExecPath = System.getProperty("java.home") + separator + "bin" + separator + "java"; + // If targeting Java 9 or higher, you could use the following instead of the above line: + //String javaExecPath = ProcessHandle.current().info().command().orElseThrow(); + + if (!(new File(javaExecPath)).exists()) { + System.err.println( + "A Java installation could not be found. If you are distributing this app with a bundled JRE, be sure to set the -XstartOnFirstThread argument manually!"); + return false; + } + + jvmArgs.add(javaExecPath); + jvmArgs.add("-XstartOnFirstThread"); + jvmArgs.add("-D" + JVM_RESTARTED_ARG + "=true"); + jvmArgs.addAll(ManagementFactory.getRuntimeMXBean().getInputArguments()); + jvmArgs.add("-cp"); + jvmArgs.add(System.getProperty("java.class.path")); + String mainClass = System.getenv("JAVA_MAIN_CLASS_" + pid); + if (mainClass == null) { + StackTraceElement[] trace = Thread.currentThread().getStackTrace(); + if (trace.length > 0) { + mainClass = trace[trace.length - 1].getClassName(); + } else { + System.err.println("The main class could not be determined."); + return false; + } + } + jvmArgs.add(mainClass); + + try { + if (!redirectOutput) { + ProcessBuilder processBuilder = new ProcessBuilder(jvmArgs); + processBuilder.start(); + } else { + Process process = (new ProcessBuilder(jvmArgs)) + .redirectErrorStream(true).start(); + BufferedReader processOutput = new BufferedReader( + new InputStreamReader(process.getInputStream())); + String line; + + while ((line = processOutput.readLine()) != null) { + System.out.println(line); + } + + process.waitFor(); + } + } catch (Exception e) { + System.err.println("There was a problem restarting the JVM"); + e.printStackTrace(); + } + + return true; + } + + /** + * Starts a new JVM if the application was started on macOS without the + * {@code -XstartOnFirstThread} argument. Returns whether a new JVM was + * started and thus no code should be executed. Redirects the output of the + * new JVM to the old one. + *

+ * Usage: + * + * 

+     * public static void main(String... args) {
+     * 	if (StartupHelper.startNewJvmIfRequired()) return; // This handles macOS support and helps on Windows.
+     * 	// the actual main method code
+     * }
+     *
+ * + * @return whether a new JVM was started and thus no code should be executed + * in this one + */ + public static boolean startNewJvmIfRequired() { + return startNewJvmIfRequired(true); + } +} diff --git "a/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/resources/libgdx128.png" "b/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/resources/libgdx128.png" new file mode 100644 index 0000000..f810616 Binary files /dev/null and "b/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/resources/libgdx128.png" differ diff --git "a/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/resources/libgdx16.png" "b/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/resources/libgdx16.png" new file mode 100644 index 0000000..a6b1327 Binary files /dev/null and "b/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/resources/libgdx16.png" differ diff --git "a/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/resources/libgdx32.png" "b/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/resources/libgdx32.png" new file mode 100644 index 0000000..9447b39 Binary files /dev/null and "b/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/resources/libgdx32.png" differ diff --git "a/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/resources/libgdx64.png" "b/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/resources/libgdx64.png" new file mode 100644 index 0000000..7513f3b Binary files /dev/null and "b/\320\227\320\260\320\275\320\270\320\274\320\260\321\202\320\265\320\273\321\214\320\275\320\276\320\265 \320\277\321\200\320\276\320\263\321\200\320\260\320\274\320\274\320\270\321\200\320\276\320\262\320\260\320\275\320\270\320\265/4/3_recursive/src/main/resources/libgdx64.png" differ -- cgit v1.2.3