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use bevy::{prelude::*, render::render_resource::{Extent3d, TextureDescriptor, TextureDimension, TextureFormat, TextureUsages}};
use bevy_dither_post_process::components::DitherPostProcessSettings;
use bevy_headless_render::{components::{HeadlessRenderBundle, HeadlessRenderDestination}, render_assets::HeadlessRenderSource};
/// Marker component for terminal display
#[derive(Component)]
pub struct TerminalDisplay;
/// Bundle for terminal display, contains a handle to an image to be used as a render target to
/// render to the terminal
#[derive(Bundle)]
pub struct TerminalDisplayBundle {
_terminal_display: TerminalDisplay,
_headless_render_bundle: HeadlessRenderBundle,
_dither_post_process_settings: DitherPostProcessSettings,
image_handle: Handle<Image>,
}
impl TerminalDisplayBundle {
/// Create a new terminal display with the given dither level. A higher level exponentially
/// increases the size of the bayer matrix used in the ordered dithering calculations. If in
/// doubt, 3 is a good starting value to test with.
pub fn new(dither_level: u32, asset_server: &AssetServer) -> Self {
let terminal_size = crossterm::terminal::size().unwrap();
let size = Extent3d {
width: (terminal_size.0 as u32) * 2,
height: (terminal_size.1 as u32) * 4,
depth_or_array_layers: 1,
};
let mut image = Image {
texture_descriptor: TextureDescriptor {
label: None,
size,
dimension: TextureDimension::D2,
format: TextureFormat::R8Unorm,
mip_level_count: 1,
sample_count: 1,
usage: TextureUsages::TEXTURE_BINDING
| TextureUsages::COPY_SRC
| TextureUsages::RENDER_ATTACHMENT,
view_formats: &[],
},
..default()
};
image.resize(size);
let image_handle = asset_server.add(image);
let framebuffer_extract_source =
asset_server.add(HeadlessRenderSource(image_handle.clone()));
Self {
_terminal_display: TerminalDisplay,
_headless_render_bundle: HeadlessRenderBundle {
source: framebuffer_extract_source,
dest: HeadlessRenderDestination::default(),
},
image_handle,
_dither_post_process_settings: DitherPostProcessSettings::new(
dither_level,
asset_server,
),
}
}
/// Retrieves the handle to this display's target image. Anything written here will be
/// displayed.
pub fn image_handle(&self) -> Handle<Image> {
self.image_handle.clone()
}
}
|
