Vertex array usage

OpenGL Development JOGL Development
#1

I can’t seem to get vertex arrays to function properly.


vertices.put( new float[]{1, 1, 0} );
vertices.put( new float[]{-1, -1, 0} );
vertices.put( new float[]{-1, 1, 0} );
vertices.put( new float[]{1, -1, 0} );
vertices.flip();

I use the above code to create my list of vertices. The float arrays are just for clarity.
After that, the following code displays a cross


vertices.rewind();
gl.glBegin( GL.GL_LINES );
while ( vertices.remaining() >= 3 )
  gl.glVertex3f( vertices.get(), vertices.get(), vertices.get() );
gl.glEnd();

But this code displays nothing at all


vertices.rewind();
gl.glEnableClientState( GL.GL_VERTEX_ARRAY );
gl.glVertexPointer( 3, GL.GL_FLOAT, 0, vertices );
gl.glDrawArrays( GL.GL_LINES, 0, 4 );

Does anyone have an idea what could be going wrong?

Some extra info:
Jogl version: cvs
GL_VENDOR: Keith Whitwell, Precision Insight Inc.
GL_RENDERER: Mesa DRI I810 20010321
GL_VERSION: 1.2 Mesa 3.4.2

#2

Problem solved. I was using buffers that I created myself and had forgotten to set the correct byte order. Default is big endian, x86 is little endian.
Note to self: always use BufferUtils :slight_smile: