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Improve texture filtering by doing it in gamma space (#7311)

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* Closes https://github.com/emilk/egui/pull/5839

This makes some transparent images look a lot nicer when blended:


![image](https://github.com/user-attachments/assets/7f370aaf-886a-423c-8391-c378849b63ca)

Cursive text will also look nicer.

This unfortunately changes the contract of what
`register_native_texture` expects

---------

Co-authored-by: Adrian Blumer <blumer.adrian@gmail.com>
This commit is contained in:
Emil Ernerfeldt
2025-07-07 17:46:27 +02:00
committed by GitHub
parent dd1052108e
commit f46926aaf1
32 changed files with 75 additions and 100 deletions
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10
crates/egui/src/lib.rs
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@@ -161,12 +161,10 @@
//!
//! * egui uses premultiplied alpha, so make sure your blending function is `(ONE, ONE_MINUS_SRC_ALPHA)`.
//! * Make sure your texture sampler is clamped (`GL_CLAMP_TO_EDGE`).
//! * egui prefers linear color spaces for all blending so:
//! * Use an sRGBA-aware texture if available (e.g. `GL_SRGB8_ALPHA8`).
//! * Otherwise: remember to decode gamma in the fragment shader.
//! * Decode the gamma of the incoming vertex colors in your vertex shader.
//! * Turn on sRGBA/linear framebuffer if available (`GL_FRAMEBUFFER_SRGB`).
//! * Otherwise: gamma-encode the colors before you write them again.
//! * egui prefers gamma color spaces for all blending so:
//! * Do NOT use an sRGBA-aware texture (NOT `GL_SRGB8_ALPHA8`).
//! * Multiply texture and vertex colors in gamma space
//! * Turn OFF sRGBA/gamma framebuffer (NO `GL_FRAMEBUFFER_SRGB`).
//!
//!
//! # Understanding immediate mode