simple procedural texture

[4fingers]

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.

1   2   3   4   5   6   7   8   9   10   11   12   13   14   15   16   17   18   19   20   21   22   23   24   25   26   27   28   29   30   31   32   33   34   35   36   37   38   39   40   41   42   43   44   45   46   47   48   49   50   51   52   53   54   55   56   57   58   59   60   61   62

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

[4fingers]

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.

1   2   3   4   5   6   7   8   9   10   11   12   13   14   15   16   17   18   19   20   21   22   23   24   25   26   27   28   29   30   31   32   33   34   35   36   37   38   39   40   41   42   43   44   45   46   47   48   49   50   51   52   53   54   55   56   57   58   59   60   61   62   63   64   65   66   67   68   69   70   71   72   73   74   75   76   77   78   79   80   81   82   83   84   85   86   87   88   89   90   91   92   93   94   95   96   97   98   99   100   101   102   103   104   105   106   107   108   109   110   111   112   113   114   115   116   117   118   119   120   121   122   123   124   125   126   127   128   129   130   131   132   133   134   135   136   137   138   139   140   141   142   143   144   145   146   147   148   149   150   151   152   153   154   155   156   157   158   159   160   161   162   163   164   165

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) {     } }

[Jark]

Hi,

I couldn't find anything wrong with your code, but you could try adding "drawable.setGL(new DebugGL(drawable.getGL()));" to your init() method. DebugGL will throw a exception if any of your GL. commands are in the wrong place. (I found out this way that there was no GL.GL_EMISSION light parameter )

And you can find the red book(a well known opengl book) online here: http://www.glprogramming.com/red/.

Games published by our own members! Check 'em out!

[4fingers]

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:

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

[lhkbob]

If you're still in the learning stages, I'd suggest making something much simpler than procedural textures, just to get a hang for how openGL and jogl feel.  This will make it much easier to debug once you come to the stuff you really want to do.