Create Texture from bytes

[tato]

I'm sorry if this is explained in an example or if it was asked before, I couldn't find it anywhere.

I am generating a texture represented as an array of rgba bytes. How do I render that as a 2d sprite with bevy?

I am setting up a startup system like the following.

fn setup_sprite_thing(
    mut commands: Commands,
    mut textures: ResMut<Assets<Texture>>,
    mut materials: ResMut<Assets<ColorMaterial>>,
) {
    use bevy::render::texture::{Extent3d, TextureDimension, TextureFormat};

    let (width, height) = (256, 256);
    let mut bytes = Vec::with_capacity(width * height * 4);
    for _y in 0..height {
        for _x in 0..width {
            bytes.push(0xff);
            bytes.push(0x00);
            bytes.push(0x00);
            bytes.push(0xff);
        }
    }

    let texture = Texture::new(
        Extent3d::new(width as u32, height as u32, 1),
        TextureDimension::D2,
        bytes,
        TextureFormat::Rgba8Uint,
    );

    let texture_handle = textures.add(texture);

    commands.spawn_bundle(OrthographicCameraBundle::new_2d());
    commands.spawn_bundle(SpriteBundle {
        material: materials.add(texture_handle.into()),
        ..Default::default()
    });
}

Nothing except the usual grey background is showing up on the window. Is there any step I'm missing, or something I'm doing wrong?

[jakobhellermann]

The code is correct but you need to use the TextureFormat::Rgba8Unorm format, then it works and displays a red square.

[tato]

Thank you!

[Niedzwiedzw]

seems like Texture no longer has "new" method, how would this be achieved on 0.6?

[mockersf]

Texture is now Image which still has new 👍

[beyarkay]

I'm getting errors on these lines:

    commands.spawn_bundle(SpriteBundle {
        material: materials.add(texture_handle.into()),
        ..Default::default()
    });

I replaced them with this (and changed the function signature) and it seemed to do the correct thing:

fn my_func(
    ...
    mut images: ResMut<Assets<Image>>,
    ...
) {

    let image = Image::new(
        Extent3d {
            width,
            height,
            depth_or_array_layers: 1,
        },
        TextureDimension::D2,
        bytes,
        TextureFormat::Rgba8Uint,
        RenderAssetUsages::MAIN_WORLD | RenderAssetUsages::RENDER_WORLD,
    );
    commands.spawn(SpriteBundle {
        texture: images.add(image),
        ..Default::default()
    });