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Fix text distortion on mobile devices/browsers with `glow` backend (#6893) 

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Did not test on platforms other than my phone, but I can't imagine it
causing problems. AFAIK if highp isn't supported then `precision highp
float;` needs to still not cause the program to fail to link/compile or
anything; it should just silently use some other precision.

* Fixes https://github.com/emilk/egui/issues/4268 for me but I only
tested it on a native Android app and I don't know whether backends
other than glow are affected.
* [x] I have followed the instructions in the PR template (but the
change is trivial so I'm just doing it from the master branch)

Before:

![image](https://github.com/user-attachments/assets/9f449749-5a48-4e9c-aef0-7a8ac3912eb6)

After:

![image](https://github.com/user-attachments/assets/544e5977-13e0-411a-bccf-b15a15289e28)
This commit is contained in:
Alexander Nadeau 2025-04-30 08:12:08 -04:00 committed by GitHub
parent f3611e3e5a
commit 6c922f72a8
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2 changed files with 14 additions and 2 deletions
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8
crates/egui_glow/src/shader/fragment.glsl
View File

@ -1,5 +1,11 @@
#ifdef GL_ES
precision mediump float;
// To avoid weird distortion issues when rendering text etc, we want highp if possible.
// But apparently some devices don't support it, so we have to check first.
#if defined(GL_FRAGMENT_PRECISION_HIGH) && GL_FRAGMENT_PRECISION_HIGH == 1
precision highp float;
#else
precision mediump float;
#endif
#endif
uniform sampler2D u_sampler;

8
crates/egui_glow/src/shader/vertex.glsl
View File

@ -9,7 +9,13 @@
#endif
#ifdef GL_ES
precision mediump float;
// To avoid weird distortion issues when rendering text etc, we want highp if possible.
// But apparently some devices don't support it, so we have to check first.
#if defined(GL_FRAGMENT_PRECISION_HIGH) && GL_FRAGMENT_PRECISION_HIGH == 1
precision highp float;
#else
precision mediump float;
#endif
#endif
uniform vec2 u_screen_size;