Posted by elect on Apr 02, 2017; 8:45pm
URL: https://forum.jogamp.org/How-to-modify-algorithm-to-return-a-triangle-with-different-colors-of-vertices-tp4037830p4037833.html

You need to put your vertex positions and colors into a buffer and upload it to the gpu, like here.

You also need to say to OpenGL how it should read your data, like here.

And then your vertex shader will fetch attribute_Position and attirbute_Color accordingly.

If completely newbie, consider following a tutorial, like this one.