JOGL 2D Texture Example

[niya]

I'm sorry, but I've been trying to find an example of how to do 2D textures with JOGL and just keep failing.  My code looks like this:

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In reshape:         gl.glViewport(0, 0, width, height); // Reset The Current Viewport        gl.glMatrixMode(GL2.GL_PROJECTION); // Select The Projection Matrix        gl.glLoadIdentity(); // Reset The Projection Matrix        // hard coded values - this needs to change based on screen size        gl.glOrthof(0, GL_WIDTH, GL_HEIGHT, 0, -1, 1);         gl.glMatrixMode(GL2.GL_MODELVIEW); // Select The Modelview Matrix        gl.glLoadIdentity(); // Reset The Modelview Matrix In draw:         gl.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);         gl.glClear(GL2.GL_DEPTH_BUFFER_BIT | GL2.GL_COLOR_BUFFER_BIT);         gl.glEnable(GL2.GL_TEXTURE_2D);         gl.glEnable(GL2.GL_BLEND);         gl.glBlendFunc(GL2.GL_ONE, GL2.GL_ONE_MINUS_SRC_ALPHA);         gl.glEnableClientState(GL2.GL_VERTEX_ARRAY);         gl.glEnableClientState(GL2.GL_COLOR_ARRAY);         gl.glColor4f(1.0f, 1.0f, 1.0f, 1.0f);         gl.glLoadIdentity();             final Texture mTest = TextureIO.newTexture(getClass().getResource("/images/glass.png"), false, TextureIO.PNG);             final float[] coordData = {                     0, 0, //                    0, 1, //                    1, 0, //                    1, 1,             };             final float[] vertices = {                     0.0f, 0.0f, 0, // Left Bottom                    0.0f, 128, 0, // Left Top                    128, 0.0f, 0, // Right Bottom                    128, 128, 0             };             // Setup the vertices into the buffer            verts = Buffers.newDirectFloatBuffer(vertices.length);             verts.put(vertices).position(0);             // Setup the texture coordinates            coords = Buffers.newDirectFloatBuffer(coordData.length);             coords.put(coordData).position(0);             mTest.enable(gl);             mTest.bind(gl);             gl.glLoadIdentity();             gl.glTranslatef(100, 100, 0);             gl.glVertexPointer(3, GL2.GL_FLOAT, 0, verts);             gl.glTexCoordPointer(2, GL2.GL_FLOAT, 0, coords);             gl.glDrawArrays(GL2.GL_TRIANGLE_STRIP, 0, 4);

I get a "Invalid memory access of location 0x0 rip=0x11cfae8ae" when it executes gl.glDrawArrays, and I just don't understand what I'm doing wrong.

I'm almost positive I have the latest version, as I donwloaded from http://jogamp.org/ just the other day.

Any help would be greatly appreciated.

Thank you.

[theagentd]

gl.glEnableClientState(gl.GL_VERTEX_ARRAY);
gl.glEnableClientState(gl.GL_TEX_COORD_ARRAY);

Also remember to disable them afterwards.

[niya]

Sorry, I missed some of the initialization steps in the copy+paste.

That's how I've setup the surface.

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[theagentd]

Then the crash might be because you don't disable them later.

[niya]

When do I have to disable them?  Before glDrawArrays?  Because if I don't call glDrawArrays, it doesn't crash, but, of course, nothing is displayed.  If I call glDrawArrays, it crashes, but it feels... like calling disable before drawing wouldn't work?

[theagentd]

Agh, silly me.

1	gl.glVertexPointer(3, GL2.GL_FLOAT, 0, verts);

Where are your 3D coordinates, mate? It reads outside the bounds of the vertex array since it assumes that it has 3 coordinates per vertex, not 2. Change the 3 to 2 and it should work.

[niya]

Agh, silly me.

1	gl.glVertexPointer(3, GL2.GL_FLOAT, 0, verts);

Where are your 3D coordinates, mate? It reads outside the bounds of the vertex array since it assumes that it has 3 coordinates per vertex, not 2. Change the 3 to 2 and it should work.

Updated, but still the same problem.

Since it's saying it's accessing memory address 0x0, I don't think the bounds problem would be it?  It's like it's not even getting the buffers in the first place.

[gouessej]

Hi

There are several wrong things in your code. You should not recreate the direct NIO buffers at each draw.

Edit.: There is an example here:
https://github.com/sgothel/jogl-demos/blob/master/src/redbook/src/glredbook11/varray.java

Edit2.: theagentd is right, you have to call gl.glEnableClientState(GL2.GL_TEX_COORD_ARRAY); but don't call gl.glEnableClientState(GL2.GL_COLOR_ARRAY); as you don't provide colors in your vertex arrays, the main problem come from that line.

Edit3.: Rather post on the official JogAmp forum, you will probably get more replies.