robfram 7991bd168d Implement line clipping for TextureProgress to avoid bad rendering due to imprecise UV mapping ...

Original code used a quick aproximation for simulating the
correspondent texel in the `TextureProgress` texture as radial
progress indicator. This lead to visualization errors. Changed it for
a Liang-Barsky line clipping algorithm stripped to its minimum for
this specific use case.

Fix #17364.

2018-03-10 20:51:42 +01:00

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