OpenGLES2 example

[ktb92677]

Hi all. I am currently running the opengles2 example for nuklear on my raspberry PI3B+. I posted a comment on #748. But I figured this required its own post so here it is!

The example runs at a little below 30fps. To be more specific each render cycle takes around 36ms. I have been able to narrow it down to two lines of code. They are as follows:

glBufferData(GL_ARRAY_BUFFER, max_vertex_buffer, NULL, GL_STREAM_DRAW);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, max_element_buffer, NULL, GL_STREAM_DRAW);

Those two lines take 10ms and 24ms respectively. If anyone who knows a lot of Opengles2 it would be great if you could chime in as I really want to bring the FPS closer to 60 if possible.

[zwykl3]

Tell me how write a red line and green rectangle on desktop/background?