The Typhothanian Posts - Answer Overflow

The Typhothanian

•Created by The Typhothanian on 11/18/2024 in #java-help

LWJGL missing EGL .dll

I hope someone here can help me with this. I just tried to add EGL to my game (for shared contexts), and it can't find the egl .dll file. Build.gradle:

val lwjglVersion = "3.3.3"
val jomlVersion = "1.10.7"

val lwjglNatives = ...

dependencies {
    api("org.joml:joml:1.10.5")

    implementation(platform("org.lwjgl:lwjgl-bom:$lwjglVersion"))

    implementation("org.lwjgl", "lwjgl")
    implementation("org.lwjgl", "lwjgl-egl")
    implementation("org.lwjgl", "lwjgl-glfw")
    implementation("org.lwjgl", "lwjgl-opengl")
    runtimeOnly("org.lwjgl", "lwjgl", classifier = lwjglNatives)
    runtimeOnly("org.lwjgl", "lwjgl-glfw", classifier = lwjglNatives)
    runtimeOnly("org.lwjgl", "lwjgl-opengl", classifier = lwjglNatives)
    implementation("org.joml", "joml", jomlVersion)

    api(project(":glwt"))
    api(project("builder"))
}

val lwjglVersion = "3.3.3"
val jomlVersion = "1.10.7"

val lwjglNatives = ...

dependencies {
    api("org.joml:joml:1.10.5")

    implementation(platform("org.lwjgl:lwjgl-bom:$lwjglVersion"))

    implementation("org.lwjgl", "lwjgl")
    implementation("org.lwjgl", "lwjgl-egl")
    implementation("org.lwjgl", "lwjgl-glfw")
    implementation("org.lwjgl", "lwjgl-opengl")
    runtimeOnly("org.lwjgl", "lwjgl", classifier = lwjglNatives)
    runtimeOnly("org.lwjgl", "lwjgl-glfw", classifier = lwjglNatives)
    runtimeOnly("org.lwjgl", "lwjgl-opengl", classifier = lwjglNatives)
    implementation("org.joml", "joml", jomlVersion)

    api(project(":glwt"))
    api(project("builder"))
}

If I try adding

runtimeOnly("org.lwjgl", "lwjgl-egl", classifier = lwjglNatives)

runtimeOnly("org.lwjgl", "lwjgl-egl", classifier = lwjglNatives)

gradle can't find it? Please help, been struggling with this for an hour.

38 replies

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•Created by The Typhothanian on 10/26/2024 in #java-help

Override Java awt repaint system (or at least make a paint listener)

I'm trying to hook up Java awt to a glfw window. I have a container (no parent) with some children, like a button. I want to know when the container is trying to repaint an area, then make my own repainting system that sends the painted content to a texture to be rendered. How can I do this? I've tried overriding repaint and paint in the container, and they don't get called. I don't want to have to insert code for all components that I add to the container. Is there some paint listener thingy I can use to do this? Also, kinda related question. If the container is trying to paint a specific section, I create a BufferedImage, create a graphics for it, then tell the container to paint to it, right? But it would just paint the whole window to that image, but I only want that specific section. And is there a better way than the BufferedImage? I need the output to eventually go to a ByteBuffer. Hope this is clear enough

107 replies

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•Created by The Typhothanian on 4/20/2024 in #java-help

Load image file into int[]

Hi. I want to load an image. I would like support for png, jpeg, webp, bmp, and (if possible) gif. I found a good source for png (http://www.libpng.org/pub/png/spec/1.2/PNG-Structure.html), but nothing for the others. I don't want to use ImageIO then read from the buffered image, as that is slow. What I am asking for is how the bits of each type are laid out, so I can construct my own image loader. Also, the int[] is a flattened image, with the index of x and y being x + y * width. I am making my own window and game library, and don't want to use the stupidly slow java awt or java swing utilities. Please help.

10 replies

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•Created by The Typhothanian on 4/4/2024 in #java-help

JNI C++ OpenGL Window Crash

Hi. I'm new to C++ and JNI, and just started yesterday. I am trying to make my own OpenGL window system. (yes, I know that is a big task, and I don't care) I got a window a while ago, but now there is a weird issue. I get this console output java-side: 1 Invalid window handle. 2 Invalid window handle. 3 Invalid window handle. 4 Invalid window handle. ... 4 The system cannot find the file specified. ... 1 Invalid window handle. 2 Invalid window handle. 3 Invalid window handle. 4 Invalid window handle. ... The numbers at the start of each line indicate where in my C++ program the issue is coming from. I don't know why the middle one is there, because I'm not loading any files. The "invalid window handle" comes from resizing one dimension of the window, and the crash comes from resizing two at the same time. My code is in comments. Please help.

12 replies

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•Created by The Typhothanian on 3/31/2024 in #java-help

Java Socket NIO Reading Issue

(code in comments) I have a server and a client. I am trying to transmit a long from the server to the client (or reverse, neither works). I can tell it is transmitting, but the reciever gets hung up on the socket.read(buf) line in readLong. Please help. I just started NIO this morning and have no clue if I'm doing it right.

7 replies

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•Created by The Typhothanian on 3/14/2024 in #java-help

Java Swing MouseListener issue

I'll have to segment the code in comments because it's too large for Discord. I have a frame, a container, and two components in the container. I made the components draggable with

final Point start = new Point();
addMouseListener(new MouseAdapter() {
    @Override
    public void mousePressed(MouseEvent e) {
        System.out.println("click");
        start.setLocation(e.getPoint());
        bringToFront();

        switch (e.getButton()) {
            case MouseEvent.BUTTON2:
                getParent().remove(ContainerItemStack.this);
                break;
            case MouseEvent.BUTTON3:
                getParent().split(ContainerItemStack.this);
                break;
        }
    }
});
addMouseMotionListener(new MouseMotionAdapter() {
    @Override
    public void mouseDragged(MouseEvent e) {
        System.out.println("drag");
        Point c = e.getLocationOnScreen();
        Point p = getParent().getLocationOnScreen();
        setLocation(c.x - p.x - start.x, c.y - p.y - start.y);
        bringToFront();
    }
});

final Point start = new Point();
addMouseListener(new MouseAdapter() {
    @Override
    public void mousePressed(MouseEvent e) {
        System.out.println("click");
        start.setLocation(e.getPoint());
        bringToFront();

        switch (e.getButton()) {
            case MouseEvent.BUTTON2:
                getParent().remove(ContainerItemStack.this);
                break;
            case MouseEvent.BUTTON3:
                getParent().split(ContainerItemStack.this);
                break;
        }
    }
});
addMouseMotionListener(new MouseMotionAdapter() {
    @Override
    public void mouseDragged(MouseEvent e) {
        System.out.println("drag");
        Point c = e.getLocationOnScreen();
        Point p = getParent().getLocationOnScreen();
        setLocation(c.x - p.x - start.x, c.y - p.y - start.y);
        bringToFront();
    }
});

It was working a few minutes ago, but now the mouse listeners aren't being triggered. Full code in comments

13 replies

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•Created by The Typhothanian on 3/9/2024 in #java-help

Collision Between Non Axis Aligned Quadrilateral Hitboxes

I have two List<double[][]>s representing several 3d quadrilaterals. They are not axis aligned. I would like to perform collision between them, and push the second one away appropriately. How can I do this? It needs to be efficient enough to work once or twice a frame in a game. Please help

4 replies

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•Created by The Typhothanian on 3/7/2024 in #java-help

JOGL glUniform4fv issue

Here's my set uniform code:

    public static boolean setUniform(GL3 gl, String name, Object value) {
        if (shaderProgram == -1) {
            throw new IllegalStateException("Shaders not initialized yet");
        }

        gl.glUseProgram(shaderProgram);

        int location;

        if (!uniforms.containsKey(name)) {
            location = gl.glGetUniformLocation(shaderProgram, name);

            if (location == -1) {
                return false;
            }

            uniforms.put(name, location);
        } else {
            location = uniforms.get(name);
        }

                double[][] matrix = (double[][]) matrix;

        if (matrix.length != 4 || matrix[0].length != 4) {
            throw new UnsupportedOperationException("Unsupported matrix size " + matrix[0].length + "x" + matrix.length);
        }

        float[] fMat = new float[16];

        for (int i = 0; i < 4; i++) {
            for (int j = 0; j < 4; j++) {
                fMat[j * 4 + i] = matrix[i][j];
            }
        }

        gl.glUniform4fv(location, 1, fMat, 0);

        return true;
    }

    public static boolean setUniform(GL3 gl, String name, Object value) {
        if (shaderProgram == -1) {
            throw new IllegalStateException("Shaders not initialized yet");
        }

        gl.glUseProgram(shaderProgram);

        int location;

        if (!uniforms.containsKey(name)) {
            location = gl.glGetUniformLocation(shaderProgram, name);

            if (location == -1) {
                return false;
            }

            uniforms.put(name, location);
        } else {
            location = uniforms.get(name);
        }

                double[][] matrix = (double[][]) matrix;

        if (matrix.length != 4 || matrix[0].length != 4) {
            throw new UnsupportedOperationException("Unsupported matrix size " + matrix[0].length + "x" + matrix.length);
        }

        float[] fMat = new float[16];

        for (int i = 0; i < 4; i++) {
            for (int j = 0; j < 4; j++) {
                fMat[j * 4 + i] = matrix[i][j];
            }
        }

        gl.glUniform4fv(location, 1, fMat, 0);

        return true;
    }

And here's the error: com.jogamp.opengl.GLException: Thread[#39,AWT-EventQueue-0,6,main] glGetError() returned the following error codes after a call to glUniform4fv(<int> 0x0, <int> 0x1, <[F>, <int> 0x0): GL_INVALID_OPERATION ( 1282 0x502) Why is there this issue? Shader init code in comment.

7 replies

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•Created by The Typhothanian on 3/3/2024 in #java-help

Get list of all loaded classes

Title says it. Need list of all loaded classes at one moment. Planning on using URLClassLoader for mods, so I can't just make a list of every class in my program.

5 replies

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•Created by The Typhothanian on 2/26/2024 in #java-help

HashSet.contains not working as expected?

I have a HashSet<Face>. Here's face:

    private static class Face {
        public Vertex[] vertices;

        public Face(Vertex[] vertices) {
            this.vertices = vertices;
        }

        @Override
        public boolean equals(Object o) {
            if (this == o) return true;
            if (o == null || getClass() != o.getClass()) return false;
            Face face = (Face) o;
            return Arrays.deepEquals(Arrays.stream(vertices)
                    .sorted(Comparator.comparingInt(v -> Arrays.hashCode(v.vertex)))
                    .toArray(Vertex[]::new), Arrays.stream(face.vertices)
                    .sorted(Comparator.comparingInt(v -> Arrays.hashCode(v.vertex)))
                    .toArray(Vertex[]::new));
        }

        @Override
        public int hashCode() {
            return Arrays.hashCode(vertices);
        }

        @Override
        public String toString() {
            return "Face{" +
                    "vertices=" + Arrays.toString(vertices) +
                    '}';
        }
    }

    private static class Face {
        public Vertex[] vertices;

        public Face(Vertex[] vertices) {
            this.vertices = vertices;
        }

        @Override
        public boolean equals(Object o) {
            if (this == o) return true;
            if (o == null || getClass() != o.getClass()) return false;
            Face face = (Face) o;
            return Arrays.deepEquals(Arrays.stream(vertices)
                    .sorted(Comparator.comparingInt(v -> Arrays.hashCode(v.vertex)))
                    .toArray(Vertex[]::new), Arrays.stream(face.vertices)
                    .sorted(Comparator.comparingInt(v -> Arrays.hashCode(v.vertex)))
                    .toArray(Vertex[]::new));
        }

        @Override
        public int hashCode() {
            return Arrays.hashCode(vertices);
        }

        @Override
        public String toString() {
            return "Face{" +
                    "vertices=" + Arrays.toString(vertices) +
                    '}';
        }
    }

If I create "idential" faces (the texCoords and vertex order aren't same, but have same vertices), Face.equals returns expected value. However, if I do that for a HashSet, it doesn't work. An ArrayList works fine, but I need a Set. What can I do to fix?

10 replies

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•Created by The Typhothanian on 2/24/2024 in #java-help

OpenGL Occlusion Culling?

I'm making a 3D game with JOGL. I expect to have a world layout like Minecraft, with a lot of cube-like models. That means I can skip faces that touch each other (occlusion culling) to speed up drawing. I want to be able to remove the indices for specific models to make this work. But, I'm using VAOs, which are not meant to be modified or read from the CPU once written. Is there a way to do this? Using JOGL GLJPanel with VAOs and Shaders. Code in comments bc I am running out of space.

6 replies

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•Created by The Typhothanian on 2/23/2024 in #java-help

JOGL Model Issues

9 replies

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•Created by The Typhothanian on 2/21/2024 in #java-help

Looking for JOGL VAO/VBO Tutorial

Title says it all. I am making 3D game, it was fine with GL2, want to upgrade to GL3. ChatGPT/Microsoft Copilot not helping. Using JOGL 2.5.0

6 replies

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•Created by The Typhothanian on 2/19/2024 in #java-help

Java AWT Move mouse automatically without triggering MouseMotionListener

I'm making a game with JOGL. I made a GLJPanel, and got everything set up. However, I have trouble with the camera rotation. Here's my mouse listener:

        panel3D.addMouseMotionListener(new MouseMotionAdapter() {
            final int[] pos = new int[]{panel3D.getLocationOnScreen().x + panel3D.getWidth() / 2, panel3D.getLocationOnScreen().y + panel3D.getHeight() / 2};

            @Override
            public void mouseMoved(MouseEvent e) {
                panel3D.rot[0] += e.getX() - pos[0];
                panel3D.rot[1] += e.getY() - pos[1];
                pos[0] = e.getX();
                pos[1] = e.getY();

                panel3D.rot[1] %= 90;

                try {
                    Point point = panel3D.getLocationOnScreen();
                    new Robot().mouseMove(point.x + panel3D.getWidth() / 2, point.y + panel3D.getHeight() / 2);
                } catch (AWTException ex) {
                    throw new RuntimeException(ex);
                }
            }
        });

        panel3D.addMouseMotionListener(new MouseMotionAdapter() {
            final int[] pos = new int[]{panel3D.getLocationOnScreen().x + panel3D.getWidth() / 2, panel3D.getLocationOnScreen().y + panel3D.getHeight() / 2};

            @Override
            public void mouseMoved(MouseEvent e) {
                panel3D.rot[0] += e.getX() - pos[0];
                panel3D.rot[1] += e.getY() - pos[1];
                pos[0] = e.getX();
                pos[1] = e.getY();

                panel3D.rot[1] %= 90;

                try {
                    Point point = panel3D.getLocationOnScreen();
                    new Robot().mouseMove(point.x + panel3D.getWidth() / 2, point.y + panel3D.getHeight() / 2);
                } catch (AWTException ex) {
                    throw new RuntimeException(ex);
                }
            }
        });

As you can see, it should work fine. However, the Robot class re-calls this MML with inverted mouse X and Y, so the camera just snaps back with the mouse. Is there a way to fix this?

12 replies

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•Created by The Typhothanian on 2/16/2024 in #java-help

Connect LWJGL to JComponent?

The title pretty much says it all. I want LWJGL to draw to a component in my JFrame, instead of a GLFW window. What's the most efficient way I can make this work, if it is possible? Thank you in advance.

6 replies

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•Created by The Typhothanian on 2/14/2024 in #java-help

Help with "Spreadsheet"

I am making a 3D game. For this game, I need an efficient way to store and access block data. I want to be able to - find any block at specified z coord, - get all blocks of same type, - get average coord for block in chunk, stuff like that. I have an idea for this, but I'm not sure if it would work for primitive types. As the title suggests, I thought of a spreadsheet. Separate columns (or lists) of each variable, and each row makes up an Object. A cell should automatically update when the row's value is changed, and the row's value should be changed when the cell is changed. I know this is easy for non-primitive types, but I am getting confused on primitives. And, if the variable is set in one of them instead of updated, it wouldn't propogate to the other and the link would be broken. (sorry if I am not using right terms, new to java). I think reflection can do this, but I have no clue how to do it. Please help?

60 replies

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•Created by The Typhothanian on 2/6/2024 in #java-help

javax.sound.sampled cannot change volume of clip (part 2, closed before properly testing)

oops. go here for what I have so far: https://discordapp.com/channels/648956210850299986/1204195625168805898 The summary is that I can control one or two things in my audio clip, but they don't seem to change anything. Also, volume, the one I want, is still unsupported. Here's what the code looks like currently:

public void play(float volume) {
    try {
        AudioInputStream stream = AudioSystem.getAudioInputStream(new ByteArrayInputStream(file));
        DataLine.Info info = new DataLine.Info(Clip.class, stream.getFormat());
        Clip clip = (Clip) AudioSystem.getLine(info);
        clip.open(stream);
        clip.start();
        ((FloatControl) clip.getControl(FloatControl.Type.VOLUME)).setValue(volume);
    } catch (UnsupportedAudioFileException | IOException | LineUnavailableException e) {
        e.printStackTrace();
    }
}

public void play(float volume) {
    try {
        AudioInputStream stream = AudioSystem.getAudioInputStream(new ByteArrayInputStream(file));
        DataLine.Info info = new DataLine.Info(Clip.class, stream.getFormat());
        Clip clip = (Clip) AudioSystem.getLine(info);
        clip.open(stream);
        clip.start();
        ((FloatControl) clip.getControl(FloatControl.Type.VOLUME)).setValue(volume);
    } catch (UnsupportedAudioFileException | IOException | LineUnavailableException e) {
        e.printStackTrace();
    }
}

Stuff like master gain works, but again, doesn't change anything. Putting before starting makes them all unsupported. Help?

31 replies

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•Created by The Typhothanian on 2/5/2024 in #java-help

javax.sound.sampled cannot change volume of clip

public void play(float volume) {
    try {
        AudioInputStream stream = AudioSystem.getAudioInputStream(new ByteArrayInputStream(file));
        DataLine.Info info = new DataLine.Info(Clip.class, stream.getFormat());
        Clip clip = (Clip) AudioSystem.getLine(info);
        ((FloatControl) AudioSystem.getMixer(null).getControl(FloatControl.Type.VOLUME)).setValue(volume);
        clip.open(stream);
        clip.start();
    } catch (UnsupportedAudioFileException | IOException | LineUnavailableException e) {
        e.printStackTrace();
    }
}

public void play(float volume) {
    try {
        AudioInputStream stream = AudioSystem.getAudioInputStream(new ByteArrayInputStream(file));
        DataLine.Info info = new DataLine.Info(Clip.class, stream.getFormat());
        Clip clip = (Clip) AudioSystem.getLine(info);
        ((FloatControl) AudioSystem.getMixer(null).getControl(FloatControl.Type.VOLUME)).setValue(volume);
        clip.open(stream);
        clip.start();
    } catch (UnsupportedAudioFileException | IOException | LineUnavailableException e) {
        e.printStackTrace();
    }
}

The method above should play a .wav file at the specified volume (file is a byte[] loaded from the .wav). However, Java tells me that it's an unsupported control type. I've tried everything and none of it works. Am I just missing something obvious? This is what the oracle site told me to do. I have a windows 11 surface pro 7, and Minecraft can change audio volume, so it's not my device. Help?

32 replies

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•Created by The Typhothanian on 2/4/2024 in #java-help

Popup.hide() doing absolutely nothing

I have a swing Popup. I am creating it like this:

JPanel panel = new JPanel(new GridLayout(0, 1));
Point screenPoint = getLocationOnScreen();
popup = PopupFactory.getSharedInstance().getPopup(this, panel, screenPoint.x, screenPoint.y + getHeight());

JPanel panel = new JPanel(new GridLayout(0, 1));
Point screenPoint = getLocationOnScreen();
popup = PopupFactory.getSharedInstance().getPopup(this, panel, screenPoint.x, screenPoint.y + getHeight());

As you can see, it looks good (I am doing this inside a custom dropdown JComponent). Then, I add buttons to it:

for (E item : items) {
    panel.add(new UButton(item.toString(), 0, 0, 200, 40, UAlignment.Default, e -> {
        open = !open;
        selectedItem = item;
        popup.hide();
        repaint();
    }) {
        @Override
        int getTexIndex() {
            return selectedItem == item ? 2 : super.getTexIndex();
        }
    });
}

for (E item : items) {
    panel.add(new UButton(item.toString(), 0, 0, 200, 40, UAlignment.Default, e -> {
        open = !open;
        selectedItem = item;
        popup.hide();
        repaint();
    }) {
        @Override
        int getTexIndex() {
            return selectedItem == item ? 2 : super.getTexIndex();
        }
    });
}

(getTexIndex() is for what texture the button should use, doesn't matter here) The consumer of MouseEvent is run when the button is released. It should hide the popup, but it doesn't. Then, I show the popup after adding the stuff:

popup.show();

popup.show();

I have absolutely no idea why this code isn't working as intended. Also, it isn't just in this area. Calling hide() somewhere else doesn't work. But, calling hide right after showing it works just fine?

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•Created by The Typhothanian on 1/30/2024 in #java-help

Package 'net.typho.pnegative.resources' clashes with class of same name?

6 replies

Gaming

Programming