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1	Java Game APIs & Engines / JOGL Development / Re: Determine what graphics card is being used	on: 2007-11-11 00:07:28
Thank you that's just what I was looking for

2	Java Game APIs & Engines / JOGL Development / Determine what graphics card is being used	on: 2007-11-10 19:25:28
Hi, Just a quick question. I was wondering if it was possible to get the graphics card make and model using JOGL or just JAVA? Thanks

3	Java Game APIs & Engines / JOGL Development / Print variables from shader	on: 2007-11-06 23:59:04
Hi, I was just wandering if it is possible to display a variable defined in a vertex or fragment shader and display it in the console like you would do in Java using System.out. Just that I am finding it hard to debug shaders when I currently cant see what some of the variables are set to. Thanks

Java Game APIs & Engines / JOGL Development / Re: Blank screen when uisng shaders

on: 2007-10-21 20:06:08

Quote

My I ask why you're enabling GL_TEXTURE_GEN_S and G_TEXTURE_1D if you never bind any textures?

It appears I accidentally left the code there after I was learning how to get a teapot on the screen:
How to draw a texture mapped teapot with automatically generated texture coordinates
But it appears that all I forgot to do was to actually set up the uniform values.

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// Set up initial uniform values
        gl.glUniform3f(gl.glGetUniformLocation(shaderprogram, "BrickColor"), 1.0f, 0.3f, 0.2f);
        gl.glUniform3f(gl.glGetUniformLocation(shaderprogram, "MortarColor"), 0.85f, 0.86f, 0.84f);
        gl.glUniform2f(gl.glGetUniformLocation(shaderprogram, "BrickSize"), 0.30f, 0.15f);
        gl.glUniform2f(gl.glGetUniformLocation(shaderprogram, "BrickPct"), 0.90f, 0.85f);
        gl.glUniform3f(gl.glGetUniformLocation(shaderprogram, "LightPosition"), 5.0f, 0.0f, 0.0f);

Otherwise it seems to working fine now and I have since removed those redundant enables and a bunch of other code.

Thanks for your help; I really do appreciate it especially through these really noobish times.

Java Game APIs & Engines / JOGL Development / Blank screen when uisng shaders

on: 2007-10-20 16:59:26

I am currently trying to get a shder to create a brick like texture on a teapot.
I can render a teapot fine using the GLUnit tools but as soon as I add the shaders the teapot just disapears.
The frag and vertex shaders were a copy paste from the orange book so they should be fine and I dont get any errors in the shader log, so at the moment I hit a wall and not sure what I have done wrong.

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public class SimpleJOGL implements GLEventListener {

    private int shaderprogram = 0;
    private GLUT glut;
    private String vertsrc = "VertexShader.vert";
    private String fragsrc = "FragmentShader.frag";
    

    public static void main(String[] args) {
        Frame frame = new Frame("Simple JOGL Application");
        GLCanvas canvas = new GLCanvas();
        
        [....]
                
        // Center frame
        frame.setLocationRelativeTo(null);
        frame.setVisible(true);
        animator.start();
    }

    public void init(GLAutoDrawable drawable) {
        // Use debug pipeline
         drawable.setGL(new DebugGL(drawable.getGL()));
        GL gl = drawable.getGL();
        glut = new GLUT();
        System.err.println("INIT GL IS: " + gl.getClass().getName());

        // Enable VSync
        gl.setSwapInterval(1);

        // Setup the drawing area and shading mode
        gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
        //gl.glShadeModel(GL.GL_SMOOTH); // try setting this to GL_FLAT and see what happens.
        
        gl.glEnable(GL.GL_DEPTH_TEST);
        gl.glDepthFunc(GL.GL_LESS);
        gl.glEnable(GL.GL_TEXTURE_GEN_S);
        gl.glEnable(GL.GL_TEXTURE_1D);
        gl.glEnable(GL.GL_CULL_FACE);
        gl.glEnable(GL.GL_LIGHTING);
        gl.glEnable(GL.GL_LIGHT0);
        gl.glEnable(GL.GL_AUTO_NORMAL);
        gl.glEnable(GL.GL_NORMALIZE);
        gl.glFrontFace(GL.GL_CW);
        gl.glCullFace(GL.GL_BACK);
        gl.glMaterialf(GL.GL_FRONT, GL.GL_SHININESS, 64.0f);
        
        setupShaders(gl);// comment this out and u can see the teapot
    }

    public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {
        [.. usual ..]
    }

    public void display(GLAutoDrawable drawable) {
        GL gl = drawable.getGL();

        // Clear the drawing area
        //gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
        // Reset the current matrix to the "identity"
        //gl.glLoadIdentity();

        // Move the "drawing cursor" around
        gl.glTranslatef(-1.5f, 0.0f, -6.0f);
   
        //gl.glPushMatrix();
        glut.glutSolidTeapot(1.0f);

        // Flush all drawing operations to the graphics card
        gl.glFlush();
    }

    public void displayChanged(GLAutoDrawable drawable, boolean modeChanged, boolean deviceChanged) {
    }

    private void setupShaders(GL gl) {
        int v = gl.glCreateShader(GL.GL_VERTEX_SHADER);
        int f = gl.glCreateShader(GL.GL_FRAGMENT_SHADER);

        if (shaderprogram == 0) {
            System.out.println("initializing shaders");
            try {
                String[] vertexsource = {stringifyfile(vertsrc)};
                String[] fragmentsource = {stringifyfile(fragsrc)};
                
                gl.glShaderSource(v, 1, vertexsource, (int[]) null, 0);
                gl.glCompileShader(v);
                checkLogInfo(gl, v);

                gl.glShaderSource(f, 1, fragmentsource, (int[]) null, 0);
                gl.glCompileShader(f);
                checkLogInfo(gl, f);

                shaderprogram = gl.glCreateProgram();
                gl.glAttachShader(shaderprogram, v);
                gl.glAttachShader(shaderprogram, f);
                
                gl.glLinkProgram(shaderprogram);
                gl.glValidateProgram(shaderprogram);
                checkLogInfo(gl, shaderprogram);
            } catch (FileNotFoundException e) {
                System.err.println("Shader source file not found." + e);
            } catch (IOException e) {
                System.err.println("Could not read shader file.");
            }
        }
        gl.glUseProgram(shaderprogram);
        checkLogInfo(gl, shaderprogram);
        checkLogInfo(gl, v);
        checkLogInfo(gl, f);
    }

    private String stringifyfile(String filename) throws IOException {
        BufferedReader br = new BufferedReader(new FileReader(filename));
        String res = "";
        String line;
        while ((line = br.readLine()) != null) {
            res += line + "\n";
        }
        return res;
    }

    private void checkLogInfo(GL gl, int obj) {
        IntBuffer iVal = BufferUtil.newIntBuffer(1);
        gl.glGetObjectParameterivARB(obj, GL.GL_OBJECT_INFO_LOG_LENGTH_ARB, iVal);

        int length = iVal.get();

        if (length <= 1) {
            return;
        }

        ByteBuffer infoLog = BufferUtil.newByteBuffer(length);

        iVal.flip();
        gl.glGetInfoLogARB(obj, length, iVal, infoLog);

        byte[] infoBytes = new byte[length];
        infoLog.get(infoBytes);
        System.out.println("GLSL Validation >> " + new String(infoBytes));
    }
}

6	Java Game APIs & Engines / JOGL Development / Re: simple procedural texture	on: 2007-10-12 15:13:27
Hi Jark, Thanks for the tip and book suggestion. But back to my problem, and after searching around I came across a MSDN page that gave more information about the glBindTextute method: http://msdn2.microsoft.com/en-us/library/ms537140.aspx In particular this is what it said: Quote Data is read from pixels as a sequence of signed or unsigned bytes, shorts or longs, or single-precision floating-point values, depending on type. The thing that struck me was no mention of integers so I changed the type over to floats and it started to work again. Maybe leaving a more open question if people are willing to help me gain a better understanding. At the moment I am happy to continue using this method in generating any other procedural texture work that I will do but due to the lack of knowledge I am currently unaware of any other more efficient ways in doing this. Will there be any performance issues that I might not be aware at in this moment in time? Thanks

Java Game APIs & Engines / JOGL Development / Re: simple procedural texture

on: 2007-10-12 13:55:24

Sorry for double post but I have some developments. I was going to try get buffered image and graphics2D involved until I found this tutorial which seems to be the thing I was looking for. It doesn't use glDrawPixels instead it used glBindTexture.
http://www.java-tips.org/other-api-tips/jogl/demonstration-of-using-glbindtexture-by-creating-and-managing-two-tex.html

Until I manage to get a book on JOGL or OpenGL I am still in the learning stages, but at the moment I am wondering that instead of using bytes for the RGBA values I could use Integers instead. I am aware there might be some efficiency problems there but at the moment I find it easier working with simple ints.

I tried converting that example to use ints but so far it hasn't worked and I am currently left with two white textures.

Here is what I have tried to do.

import java.awt.event.*;
import javax.swing.JFrame;
import javax.media.opengl.*;
import javax.media.opengl.glu.*;
import com.sun.opengl.util.*;
import java.nio.IntBuffer;

/**
 * This program demonstrates using glBindTexture() by creating and managing two
 * textures.
 *
 * @author Kiet Le (Java port)
 */
public class texbind extends JFrame implements GLEventListener, KeyListener {

    private GLCapabilities caps;
    private GLCanvas canvas;
    private GLU glu;
    private GLUT glut;
    //
    private static final int rgba = 4;
    private static final int checkImageWidth = 64;
    private static final int checkImageHeight = 64;
    // private byte checkImage[][][];
    // private byte otherImage[][][];
    private IntBuffer checkImageBuf = BufferUtil.newIntBuffer(checkImageWidth * checkImageHeight * rgba);
    private IntBuffer otherImageBuf = BufferUtil.newIntBuffer(checkImageWidth * checkImageHeight * rgba);
    private int[] texName = new int[2];

    public texbind() {
        super("texbind");

        caps = new GLCapabilities();
        canvas = new GLCanvas(caps);
        canvas.addGLEventListener(this);
        canvas.addKeyListener(this);

        getContentPane().add(canvas);
    }

    public void run() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(250, 250);
        setLocationRelativeTo(null);
        setVisible(true);
        canvas.requestFocusInWindow();
    }

    public static void main(String[] args) {
        new texbind().run();
    }

    public void init(GLAutoDrawable drawable) {
        GL gl = drawable.getGL();
        glu = new GLU();

        gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
        gl.glShadeModel(GL.GL_FLAT);
        gl.glEnable(GL.GL_DEPTH_TEST);

        makeCheckImages();

        gl.glPixelStorei(GL.GL_UNPACK_ALIGNMENT, 1);

        gl.glGenTextures(2, texName, 0);
        gl.glBindTexture(GL.GL_TEXTURE_2D, texName[0]);
        gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_S, GL.GL_CLAMP);
        gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_T, GL.GL_CLAMP);
        gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAG_FILTER, GL.GL_NEAREST);
        gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MIN_FILTER, GL.GL_NEAREST);
        gl.glTexImage2D(GL.GL_TEXTURE_2D, 0, GL.GL_RGBA, checkImageWidth, checkImageHeight, 0, GL.GL_RGBA, GL.GL_INT, checkImageBuf);

        gl.glBindTexture(GL.GL_TEXTURE_2D, texName[1]);
        gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_S, GL.GL_CLAMP);
        gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_T, GL.GL_CLAMP);
        gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAG_FILTER, GL.GL_NEAREST);
        gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MIN_FILTER, GL.GL_NEAREST);
        gl.glTexEnvf(GL.GL_TEXTURE_ENV, GL.GL_TEXTURE_ENV_MODE, GL.GL_DECAL);
        gl.glTexImage2D(GL.GL_TEXTURE_2D, 0, GL.GL_RGBA, checkImageWidth, checkImageHeight, 0, GL.GL_RGBA, GL.GL_INT, otherImageBuf);
        gl.glEnable(GL.GL_TEXTURE_2D);
    }

    public void display(GLAutoDrawable drawable) {
        GL gl = drawable.getGL();

        gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);

        //First texture
        gl.glBindTexture(GL.GL_TEXTURE_2D, texName[0]);
        gl.glBegin(GL.GL_QUADS);
        gl.glTexCoord2d(0.0, 0.0);
        gl.glVertex3d(-2.0, -1.0, 0.0);
        gl.glTexCoord2d(0.0, 1.0);
        gl.glVertex3d(-2.0, 1.0, 0.0);
        gl.glTexCoord2d(1.0, 1.0);
        gl.glVertex3d(0.0, 1.0, 0.0);
        gl.glTexCoord2d(1.0, 0.0);
        gl.glVertex3d(0.0, -1.0, 0.0);
        gl.glEnd();

        //Second texture
        gl.glBindTexture(GL.GL_TEXTURE_2D, texName[1]);
        gl.glBegin(GL.GL_QUADS);
        gl.glTexCoord2d(0.0, 0.0);
        gl.glVertex3d(1.0, -1.0, 0.0);
        gl.glTexCoord2d(0.0, 1.0);
        gl.glVertex3d(1.0, 1.0, 0.0);
        gl.glTexCoord2d(1.0, 1.0);
        gl.glVertex3d(2.41421, 1.0, -1.41421);
        gl.glTexCoord2d(1.0, 0.0);
        gl.glVertex3d(2.41421, -1.0, -1.41421);
        gl.glEnd();
        gl.glFlush();
    }

    public void reshape(GLAutoDrawable drawable, int x, int y, int w, int h) {
        GL gl = drawable.getGL();

        gl.glViewport(0, 0, w, h);
        gl.glMatrixMode(GL.GL_PROJECTION);
        gl.glLoadIdentity();
        glu.gluPerspective(60.0, (float) w / (float) h, 1.0, 30.0);
        gl.glMatrixMode(GL.GL_MODELVIEW);
        gl.glLoadIdentity();
        gl.glTranslated(0.0, 0.0, -3.6);
    }

    public void displayChanged(GLAutoDrawable drawable, boolean modeChanged, boolean deviceChanged) {
    }

    private void makeCheckImages() {
        //byte c = 0x00;
        for (int i = 0; i < checkImageWidth; i++) {
            for (int j = 0; j < checkImageHeight; j++) {
                checkImageBuf.put((int) (Math.random()*256)); // R
                checkImageBuf.put((int) (Math.random()*256)); // G
                checkImageBuf.put((int) (Math.random()*256)); // B
                checkImageBuf.put((int) (Math.random()*256)); // A
                
                otherImageBuf.put((int) (Math.random()*256)); // R
                otherImageBuf.put((int) (Math.random()*256)); // G
                otherImageBuf.put((int) (Math.random()*256)); // B
                otherImageBuf.put((int) (Math.random()*256)); // A

            }
        }
        checkImageBuf.rewind();
        otherImageBuf.rewind();
    }

    public void keyTyped(KeyEvent key) {
    }

    public void keyPressed(KeyEvent key) {
        switch (key.getKeyCode()) {
            case KeyEvent.VK_ESCAPE:
                System.exit(0);
            default:
                break;
        }
    }

    public void keyReleased(KeyEvent key) {
    }
}

Java Game APIs & Engines / JOGL Development / simple procedural texture

on: 2007-10-11 08:16:54

I am just trying my hands at a procedural type of texture but so far any attempts have failed yet I can draw squares and triangles no problem.

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    public void display(GLAutoDrawable drawable) {

        GL gl = drawable.getGL();

        // Clear the drawing area
        gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);
        // Reset the current matrix to the "identity"
        gl.glLoadIdentity();

        // Move the "drawing cursor" around
        gl.glTranslatef(-1.5f, 1.0f, -6.0f);

        // Drawing Using Triangles
        float[] brickColour = { 0.5f, 0.15f, 0.14f};
        gl.glBegin(GL.GL_TRIANGLES);
        gl.glColor3fv(brickColour,0);    // Set the current drawing color to red
        gl.glVertex3f(0.0f, 1.0f, 0.0f);   // Top
        gl.glColor3f(0.0f, 1.0f, 0.0f);    // Set the current drawing color to green
        gl.glVertex3f(-1.0f, -1.0f, 0.0f); // Bottom Left
        gl.glColor3f(0.0f, 0.0f, 1.0f);    // Set the current drawing color to blue
        gl.glVertex3f(1.0f, -1.0f, 0.0f);  // Bottom Right
        // Finished Drawing The Triangle
        gl.glEnd();

        // Move the "drawing cursor" to another position
        gl.glTranslatef(3.0f, 0.0f, 0.0f);
        
        // Draw a simple texture
        drawImage(gl);

        // Flush all drawing operations to the graphics card
        gl.glFlush();
    }

    private void drawImage(GL gl) {
        
        // draw a rectangle which should be seen if this works
        gl.glColor3f(1.0f, 0.5f, 0.0f);
        gl.glRecti(0, 1, 1, 0);
        gl.glColor3f(0.0f, 0.0f, 0.0f);


        int width = 50;
        int height = 100;
        IntBuffer buffer = IntBuffer.allocate(3 * width * height);

        for (int h = 0; h < height; h++) {
            for (int w = 0; w < width; w++) {
                buffer.put(0); // R
                buffer.put(0); // G
                buffer.put(255); // B
            }
        }
        buffer.rewind();

        gl.glDrawBuffer(GL.GL_FRONT);
        gl.glRasterPos2i(0, 0);
        gl.glDrawPixels(width, height, GL.GL_RGB, GL.GL_INT, buffer); 
        
        //gl.glFinish();
 
    }

Any idea where I am going wrong.
Thanks

Edit: Woops left in two unrealted functions, now been removed

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