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egui_glow: Reduce memory allocations in Painter::set_texture (#1096)

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Use bytemuck::cast_slice
This commit is contained in:
dvec
2022-01-12 13:33:06 +03:00
committed by GitHub
parent d9cfeff72c
commit 6c616a1b69
2 changed files with 5 additions and 6 deletions
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3
egui_glow/Cargo.toml
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@@ -23,8 +23,9 @@ include = [
all-features = true all-features = true
[dependencies] [dependencies]
egui = { version = "0.16.0", path = "../egui", default-features = false, features = ["single_threaded"] } egui = { version = "0.16.0", path = "../egui", default-features = false, features = ["single_threaded", "convert_bytemuck"] }
bytemuck = "1.7"
epi = { version = "0.16.0", path = "../epi", optional = true } epi = { version = "0.16.0", path = "../epi", optional = true }
glow = "0.11" glow = "0.11"
memoffset = "0.6" memoffset = "0.6"

8
egui_glow/src/painter.rs
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@@ -2,6 +2,7 @@
use std::collections::HashMap; use std::collections::HashMap;
use bytemuck::cast_slice;
use egui::{ use egui::{
emath::Rect, emath::Rect,
epaint::{Color32, Mesh, Vertex}, epaint::{Color32, Mesh, Vertex},
@@ -434,17 +435,14 @@ impl Painter {
"Mismatch between texture size and texel count" "Mismatch between texture size and texel count"
); );
let mut data = Vec::with_capacity(image.pixels.len() * 4); let data: &[u8] = cast_slice(image.pixels.as_ref());
for srgba in &image.pixels {
data.extend_from_slice(&srgba.to_array());
}
let gl_texture = srgb_texture2d( let gl_texture = srgb_texture2d(
gl, gl,
self.is_webgl_1, self.is_webgl_1,
self.srgb_support, self.srgb_support,
self.texture_filter, self.texture_filter,
&data, data,
image.size[0], image.size[0],
image.size[1], image.size[1],
); );