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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-wgpu/src/egui.wgsl
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@@ -97,9 +97,8 @@ fn vs_main(
@fragment
fn fs_main_linear_framebuffer(in: VertexOutput) -> @location(0) vec4<f32> {
// We always have an sRGB aware texture at the moment.
let tex_linear = textureSample(r_tex_color, r_tex_sampler, in.tex_coord);
let tex_gamma = gamma_from_linear_rgba(tex_linear);
// We expect "normal" textures that are NOT sRGB-aware.
let tex_gamma = textureSample(r_tex_color, r_tex_sampler, in.tex_coord);
var out_color_gamma = in.color * tex_gamma;
// Dither the float color down to eight bits to reduce banding.
// This step is optional for egui backends.
@@ -115,9 +114,8 @@ fn fs_main_linear_framebuffer(in: VertexOutput) -> @location(0) vec4<f32> {
@fragment
fn fs_main_gamma_framebuffer(in: VertexOutput) -> @location(0) vec4<f32> {
// We always have an sRGB aware texture at the moment.
let tex_linear = textureSample(r_tex_color, r_tex_sampler, in.tex_coord);
let tex_gamma = gamma_from_linear_rgba(tex_linear);
// We expect "normal" textures that are NOT sRGB-aware.
let tex_gamma = textureSample(r_tex_color, r_tex_sampler, in.tex_coord);
var out_color_gamma = in.color * tex_gamma;
// Dither the float color down to eight bits to reduce banding.
// This step is optional for egui backends.