[Bug 96420] GLES3 doesn't respect gl_PointSize

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96420

--- Comment #3 from Kenneth Graunke <kenneth at whitecape.org> ---
Created attachment 124401
  --> https://bugs.freedesktop.org/attachment.cgi?id=124401&action=edit
Patch to make the demo explicitly create an ES 3.0 context.

I compiled the demo with the following command:

$ g++ -lGLESv2 -lglfw -Wall -g cpp-tutorial-4-gles3-pointcloud.cpp

and indeed saw that the vertex shader's gl_PointSize output was being ignored. 
However, when I looked into it, I was surprised to see that the demo was
actually using a legacy OpenGL context!  Then, the behavior makes sense -
OpenGL defaults to using point size from API state, not the shader output.

I patched the demo to make it explicitly create an ES 3.0 context, and then it
appears to work correctly.  See the attached patch and images.

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