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glamor: broken fonts with GLES2.

In current master, GLES2 glamor receives correct colors at last, but one problem remains: cranky fonts. It can be visible on etnaviv driver or any other driver using GLES2, or if you use any mesa driver with MESA_GLES_VERSION_OVERRIDE=2.0. Screenshot of the problem:

es2_buggy_fonts

However, if your device is capable of GLES3, you will get correct rendering: es3_correct_rendering

Steps to reproduce:

  1. export MESA_GLES_VERSION_OVERRIDE=2.0 for buggy variant, if your hardware is ES3-capable.
  2. Xephyr -glamor_gles2
  3. openbox
  4. xterm

There is es2_info form both variants:

es2 (buggy): es2_info_es2.txt es3 (correct): es2_info_es3.txt

This bug will be fixed by !924 (closed).

@anholt, please, take a look why I want texture_only flag on GLES2 glamor.

Edited by Konstantin
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