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authorLibravatar Silas Bartha <silas@exvacuum.dev>2024-04-24 14:03:15 -0400
committerLibravatar Silas Bartha <silas@exvacuum.dev>2024-04-24 14:03:15 -0400
commitf98b27592b2482dc89adc055073a3ee015f2424e (patch)
tree43a52b2ba3640a0711306beee74cc27273d2f017 /src/components.rs
Initial Commitv0.1.0
Diffstat (limited to 'src/components.rs')
-rw-r--r--src/components.rs63
1 files changed, 63 insertions, 0 deletions
diff --git a/src/components.rs b/src/components.rs
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+++ b/src/components.rs
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+use bevy::{
+ prelude::*,
+ render::{
+ render_asset::RenderAssetUsages,
+ render_resource::{Extent3d, TextureDimension, TextureFormat, TextureUsages}, extract_component::ExtractComponent,
+ },
+};
+
+#[derive(Component, ExtractComponent, Clone)]
+pub struct DitherPostProcessSettings(Handle<Image>);
+
+impl DitherPostProcessSettings {
+ pub fn new(level: u32, mut images: ResMut<Assets<Image>>) -> Self {
+ let power = level + 1;
+ let map_size: u32 = 1 << power;
+ let mut buffer = Vec::<u8>::new();
+
+ for row in 0..map_size {
+ for col in 0..map_size {
+ let a = row ^ col;
+ // Interleave bits of `a` with bits of y coordinate in reverse order
+ let mut result: u64 = 0;
+ let mut bit = 0;
+ let mut mask = power as i32 - 1;
+ loop {
+ if bit >= 2 * power {
+ break;
+ }
+ result |= (((col >> mask) & 1) << bit) as u64;
+ bit += 1;
+ result |= (((a >> mask) & 1) << bit) as u64;
+ bit += 1;
+ mask -= 1;
+ }
+ let value = ((result as f32 / map_size.pow(2) as f32) * 255.0) as u8;
+ buffer.push(value);
+ }
+
+ }
+
+ let mut image = Image::new(
+ Extent3d {
+ width: map_size,
+ height: map_size,
+ depth_or_array_layers: 1,
+ },
+ TextureDimension::D2,
+ buffer,
+ TextureFormat::R8Unorm,
+ RenderAssetUsages::RENDER_WORLD,
+ );
+ image.texture_descriptor.usage =
+ TextureUsages::COPY_DST | TextureUsages::STORAGE_BINDING | TextureUsages::TEXTURE_BINDING;
+
+ let handle = images.add(image);
+
+ Self(handle)
+ }
+
+ pub fn handle(&self) -> Handle<Image> {
+ self.0.clone()
+ }
+}