How to resolve GL2 class does not exist?

mmk

I am trying to upgrade from Processing 2 to Processing 3. I am getting an error that the class GL2 does not exist. Do I need to install JOGL. If so, then how to install it for mac OS Sierra?

koogs

processing 3 uses, iirc, jogamp libraries, not jogl (i think they are the roughly the same thing, just renamed, updated). but you don't usually need to specify imports for that stuff, it's automatic.

post a runnable code sample that shows the problem.

mmk

void drawsketch {
  PGL pgl;
  pgl = beginPGL();
  GL2 gl = ((PJOGL)pgl).gl.getGL2();
}

koogs

What do you then do with gl2?

koogs

if i need raw opengl in v3 for, say, additive blending, i use the following

// before setup
import processing.opengl.*;
import com.jogamp.opengl.*;  // new jogl - 3.0b7

// in draw
GL gl = ((PJOGL)beginPGL()).gl.getGL();
// eg additive blending
gl.glEnable(GL.GL_BLEND);
gl.glBlendFunc(GL.GL_SRC_ALPHA, GL.GL_ONE);
gl.glDisable(GL.GL_DEPTH_TEST);

koogs

(ah, ok, that's GL and not GL2. and is very similar to yours)

koogs

which calls this

https://github.com/processing/processing/blob/83739c692754ec9d65d3730b4574a66619892575/core/src/processing/opengl/PJOGL.java#L238

or this

https://github.com/processing/processing/blob/83739c692754ec9d65d3730b4574a66619892575/core/src/processing/opengl/PJOGL.java#L254

this sets the protected GL2 variable called gl2x (and a bunch of others), if applicable. but both of those take an argument...

koogs

this should be fine

GL2 gl2 = ((PJOGL)beginPGL()).gl.getGL2();

mine compiles and runs but tells me it's not a GL2 implementation.

mmk

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;

import com.jogamp.opengl.GL;
import com.jogamp.opengl.GL2ES2;

This solved the issue. But now I am getting a new error.

The static field GL_LINE should be used in a static way. This is the code snippet for its use.

gl.glBegin(gl.GL_LINES); // start drawing points

Please guide me as to how to resolve this.

koogs

gl.GL_LINES should be GL.GL_LINES.

It's static so you need to use the class and bit the variable.