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POBit of Help Porting this tutorial
 

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    <p>I'm trying to use the code in <a href="http://nehe.gamedev.net/article/using_gluunproject/16013/" rel="nofollow">this tutorial</a>, but its in the wrong language (OPEN-GL) so i'm porting it into OPENGL-ES as best I can. This is what I have so far:</p> <pre><code>public void coordinates (GL10 gl, int x, int y, int width, int height){ int[] viewport = new int[4]; gl.glGetIntegerv(GL11.GL_VIEWPORT, viewport, 0); int[] modelview = new int[16]; gl.glGetIntegerv(GL11.GL_MODELVIEW_MATRIX, modelview, 0); int[] projection = new int[16]; gl.glGetIntegerv(GL11.GL_PROJECTION_MATRIX, projection, 0); sety = viewport[3] - sety; } </code></pre> <p>Got a bit thrown by the glReadPixel command because it doesn't accept this</p> <pre><code>gl.glReadPixels(setx, sety, 1, 1, GL_DEPTH_COMPONENT, GL_FLOAT, &amp;setz); </code></pre> <p>Error states that GL_DEPTH_COMPONENT, GL_FLOAT and &amp;setz can't be resolved. What is the OPENGL-ES alternative?</p> <p>Also the last part of the tutorial, step 5, is that a whole new method or a compilation of the whole tutorial?</p> <p>NOTE: setx and sety are private floats called at the top of my code</p> <p>EDIT: I'm also having trouble with the gluUnProject command it seems to require more values than the opengl version in the tutorial.</p> <p>(in opengl-es)</p> <pre><code> GLU.gluUnProject(winX, winY, winZ, model, modelOffset, project, projectOffset, view, viewOffset, obj, objOffset) </code></pre> <p>(and in the tutorial)</p> <pre><code>gluUnProject( winX, winY, winZ, modelview, projection, viewport, &amp;posX, &amp;posY, &amp;posZ); </code></pre> <p>EDIT:</p> <p>Okay I think I've pretty much solved my own question but I'm still having problems.</p> <pre><code>gl.glReadPixels </code></pre> <p>requires these variables </p> <pre><code>glReadPixels(int, int, int, int, int, int, Buffer) </code></pre> <p>Which is fine but </p> <pre><code>GLU.gluUnproject </code></pre> <p>Requires the x coordinate (returned as a buffer by readpixels) to be float.</p> <p>Also in the NeHe tutorial UnProject returns three floats but here it seems to only leave room for one so I have no idea how to get the variables. This is my current glUnproject code which doesn't match the accepted layout yet.</p> <pre><code>GLU.gluUnProject(setx, newsety, setz, modelview, 0, projection, 0, viewport, 0, posx, 0, posy, 0, posz, 0); </code></pre> <p>these arguments are as such</p> <pre><code> (float, float, buffer, int[], int, int[], int, int[], int, float, int, float, int, float, int)] </code></pre> <p>When they should be </p> <pre><code>(float, float, float, float[], int, float[], int, int[], int, float[], int) </code></pre> <p>EDIT:</p> <p>Right I decided I could do away with the readpixel command because my game is 2D and setting z to 0 should work OK</p> <p>so the buffer problem is gone</p> <p>I changed some of my variables to floats and GLU.gluUnProject now returns no errors. I still don't quite know how to return the posx, posy, posz variables however.</p> <p>Here is my code as it stands.</p> <pre><code> public void Vector3 (GL11 gl, int x, int y){ int[] viewport = new int[4]; float[] modelview = new float[16]; float[] projection = new float[16]; float winx, winy, winz; float posx, posy, posz; float[] Vector3 = new float[3]; gl.glGetIntegerv(GL11.GL_VIEWPORT, viewport, 0); gl.glGetFloatv(GL11.GL_MODELVIEW_MATRIX, modelview, 0); gl.glGetFloatv(GL11.GL_PROJECTION_MATRIX, projection, 0); winx = setx; winy = viewport[3] - sety; winz = 0; GLU.gluUnProject(winx, winy, winz, modelview, 0, projection, 0, viewport, 0, Vector3, 0); return Vector3(posx, posy, posz); } </code></pre> <p>setx, sety, setz are global variables and the return Vector3(posx, posy, posz); line currently returns errors.</p> <p>Your help would be appreciated thankyou.</p> <p>EDIT: Okay Think I got it </p> <p>Here is some code (I included the motion event method because that is where the problem currently is and the draw method to give some context)</p> <pre><code>public synchronized void randomMethod(MotionEvent event){ if (event.getAction() == MotionEvent.ACTION_DOWN){ setx = event.getX(); sety = event.getY(); Vector3(null); } } public void Vector3 (GL11 gl){ int[] viewport = new int[4]; float[] modelview = new float[16]; float[] projection = new float[16]; float winx, winy, winz; float[] Vector3 = new float[3]; gl.glGetIntegerv(GL11.GL_VIEWPORT, viewport, 0); gl.glGetFloatv(GL11.GL_MODELVIEW_MATRIX, modelview, 0); gl.glGetFloatv(GL11.GL_PROJECTION_MATRIX, projection, 0); winx = setx; winy = viewport[3] - sety; winz = 0; GLU.gluUnProject(winx, winy, winz, modelview, 0, projection, 0, viewport, 0, Vector3, 0); posx = Vector3[1]; posy = Vector3[2]; posz = Vector3[3]; } @Override public void onDrawFrame(GL10 gl) { gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT); gl.glLoadIdentity(); gl.glPushMatrix(); gl.glTranslatef(posx, posy, posz); gl.glScalef(100, 100, 0); square.draw(gl); gl.glPopMatrix(); } </code></pre> <p>My error log shows</p> <pre><code>07-30 10:41:03.220: ERROR/AndroidRuntime(340): Uncaught handler: thread main exiting due to uncaught exception 07-30 10:41:03.270: ERROR/AndroidRuntime(340): java.lang.NullPointerException 07-30 10:41:03.270: ERROR/AndroidRuntime(340): at android.app.ui.GLSurfaceRenderer.Vector3(GLSurfaceRenderer.java:51) 07-30 10:41:03.270: ERROR/AndroidRuntime(340): at android.app.ui.GLSurfaceRenderer.randomMethod(GLSurfaceRenderer.java:40) 07-30 10:41:03.270: ERROR/AndroidRuntime(340): at android.app.ui.Practice.onTouchEvent(Practice.java:41) 07-30 10:41:03.270: ERROR/AndroidRuntime(340): at android.app.Activity.dispatchTouchEvent(Activity.java:2064) 07-30 10:41:03.270: ERROR/AndroidRuntime(340): at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:1643) 07-30 10:41:03.270: ERROR/AndroidRuntime(340): at android.view.ViewRoot.handleMessage(ViewRoot.java:1690) 07-30 10:41:03.270: ERROR/AndroidRuntime(340): at android.os.Handler.dispatchMessage(Handler.java:99) 07-30 10:41:03.270: ERROR/AndroidRuntime(340): at android.os.Looper.loop(Looper.java:123) 07-30 10:41:03.270: ERROR/AndroidRuntime(340): at android.app.ActivityThread.main(ActivityThread.java:4310) 07-30 10:41:03.270: ERROR/AndroidRuntime(340): at java.lang.reflect.Method.invokeNative(Native Method) 07-30 10:41:03.270: ERROR/AndroidRuntime(340): at java.lang.reflect.Method.invoke(Method.java:521) 07-30 10:41:03.270: ERROR/AndroidRuntime(340): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860) 07-30 10:41:03.270: ERROR/AndroidRuntime(340): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618) 07-30 10:41:03.270: ERROR/AndroidRuntime(340): at dalvik.system.NativeStart.main(Native Method) </code></pre> <p>I have a hunch that the problem may be caused by the way i've called Vector3 in randomMethod, but I can't think how else I could achieve the same thing (maybe its the null argument).</p>
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    1. COm working over it, m new on open-gl but learn lots, thanks man
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