Posted by Sven Gothel on Feb 17, 2023; 11:34pm
URL: https://forum.jogamp.org/Graph-Type-Rendering-Updates-Graph-UI-tp4042173p4042198.html

Graph Curve Renderer Overflow

One remaining Graph Curve Renderer issue is having 'too much text',
overflowing as in looping from the end text-block to the beginning with garbage.

This occurs since our ES2 VBO GLRegion implementation uses UNSIGNED_SHORT to store vertex-indices
and we hit the roof with a simple ~700 character text.

- Using UNSIGNED_INT pushes out this limitation for 'a good while' :)

- Since ES3, glDrawElements(..) does support UNSIGNED_INT, good.

- Perhaps need to find an API way to tell the user ...

- Perhaps partitioning the region into more than one?

- Perhaps reduced index count by properly reusing shapes,
  same way as we use it before triangulation for font glyphs etc?

- There is room for improvements and perf enhancements in this area ..

+++

So while the above resolves the overflow issue, there are still glyph rendering bugs
with some fonts ..

Here a little snapshot showing the overflow being fixed (otherwise FreeMono text would have been broken),
but also shows some issues left .. (also w/ FreeSerif ..)

Little list of other bugs:
- Some glyphs still buggy (FreeMono, FreeSans, but FreeSerif is OK)
  - perhaps still some winding issues?
- Layout broken for FreeSerif, ' ' <space> spacing is tooo wide.

OK, screenshot now from here (not killing the text flow here)
https://jausoft.com/blog/wp-content/uploads/2023/02/text-vbaa1-msaa0-FreeMono_Regular-text1-S04-Z0000-snap06-1628x640-1.png