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text rendering: convert colours only once per section (#5474)

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# Objective

- Improve performance when rendering text

## Solution

- While playing with example `many_buttons`, I noticed a lot of time was spent converting colours
- Investigating, the biggest culprit seems to be text colour. Each glyph in a text is an individual UI node for rendering, with a copy of the colour. Making the conversion to RGBA linear only once per text section reduces the number of conversion done once rendering.
- This improves FPS for example `many_buttons` from ~33 to ~42
- I did the same change for text 2d
This commit is contained in:
François 2022-07-28 13:34:56 +00:00
parent 5666788628
commit 4e2600b788
2 changed files with 19 additions and 5 deletions
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14
crates/bevy_text/src/text2d.rs
View file

@ -11,6 +11,7 @@ use bevy_ecs::{
use bevy_math::{Vec2, Vec3};
use bevy_reflect::Reflect;
use bevy_render::{
prelude::Color,
texture::Image,
view::{ComputedVisibility, Visibility},
Extract,
@ -101,11 +102,16 @@ pub fn extract_text2d_sprite(
HorizontalAlign::Right => Vec3::new(-width, 0.0, 0.0),
};
let mut color = Color::WHITE;
let mut current_section = usize::MAX;
for text_glyph in text_glyphs {
let color = text.sections[text_glyph.section_index]
.style
.color
.as_rgba_linear();
if text_glyph.section_index != current_section {
color = text.sections[text_glyph.section_index]
.style
.color
.as_rgba_linear();
current_section = text_glyph.section_index;
}
let atlas = texture_atlases
.get(&text_glyph.atlas_info.texture_atlas)
.unwrap();

10
crates/bevy_ui/src/render/mod.rs
View file

@ -295,8 +295,16 @@ pub fn extract_text_uinodes(
let text_glyphs = &text_layout.glyphs;
let alignment_offset = (uinode.size / -2.0).extend(0.0);
let mut color = Color::WHITE;
let mut current_section = usize::MAX;
for text_glyph in text_glyphs {
let color = text.sections[text_glyph.section_index].style.color;
if text_glyph.section_index != current_section {
color = text.sections[text_glyph.section_index]
.style
.color
.as_rgba_linear();
current_section = text_glyph.section_index;
}
let atlas = texture_atlases
.get(&text_glyph.atlas_info.texture_atlas)
.unwrap();