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Mike Erwin 2d71d13ea2 OpenGL: fixes related to GL_POINTS ...

I put all usage of GL_POINTS under the microscope. Fixed problems &
optimized a couple of spots.

- reduce calls to glPointSize by about 50%
- draw selected & unselected vertices together for UV editor & EditMesh
- draw initial gpencil stroke point the proper size
- a few other smaller fixes

New policy: each GL_POINTS draw call needs to set its desired point
size. This eliminates half our calls to glPointSize (setting it back to
its 1.0 default after every draw).

2016-01-15 23:51:29 -05:00

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