pretty_text_effects 0.1.0

Text effects for Bevy Pretty Text
Documentation 
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use bevy::asset::{load_internal_asset, weak_handle};
use bevy::prelude::*;
use bevy::render::render_resource::{AsBindGroup, ShaderRef};
use bevy::sprite::{AlphaMode2d, Material2d};
use pretty_text::material::PrettyTextMaterialAppExt;
use pretty_text_macros::TextMaterial2d;

const GLITCH_SHADER_HANDLE: Handle<Shader> = weak_handle!("5b5d15ce-feb7-4565-9644-1a0df1c37a40");

pub(super) fn plugin(app: &mut App) {
    load_internal_asset!(
        app,
        GLITCH_SHADER_HANDLE,
        "shaders/glitch.wgsl",
        Shader::from_wgsl
    );

    app.register_pretty_material::<Glitch>("glitch")
        .register_asset_reflect::<Glitch>()
        .register_type::<Glitch>();
}

/// Displaces scanlines in a glyph.
///
/// ```
#[doc = include_str!("../docs/header.txt")]
/// # use pretty_text::material::PrettyTextMaterial;
/// #
/// // Parsed usage
/// world.spawn(pretty!("`my text`[glitch(0.02, 150, 8, 0.85)]"));
/// world.spawn(PrettyTextParser::bundle("`my text`[glitch(0.02, 150, 8, 0.85)]")?);
///
/// // Literal usage
/// world.spawn((
///     Text2d::new("my text"),
///     PrettyTextMaterial(materials.add(Glitch {
///         atlas: Default::default(),
///         intensity: 0.02,
///         frequency: 150.0,
///         speed: 8.0,
///         threshold: 0.85,
///     })),
/// ));
#[doc = include_str!("../docs/footer.txt")]
/// ```
#[derive(Debug, Clone, Asset, AsBindGroup, Reflect, TextMaterial2d)]
pub struct Glitch {
    /// Font atlas texture handle.
    #[texture(0)]
    #[sampler(1)]
    #[pretty_text(atlas)]
    pub atlas: Handle<Image>,

    /// Maximum displacement.
    #[uniform(2)]
    pub intensity: f32,

    /// Number of potential scanlines.
    #[uniform(3)]
    pub frequency: f32,

    /// How fast the glitch changes.
    #[uniform(4)]
    pub speed: f32,

    /// Minimum threshold for glitch to occur.
    #[uniform(5)]
    pub threshold: f32,
}

impl Default for Glitch {
    fn default() -> Self {
        Self {
            atlas: Default::default(),
            intensity: 0.02,
            frequency: 150.0,
            speed: 8.0,
            threshold: 0.85,
        }
    }
}

impl Material2d for Glitch {
    fn vertex_shader() -> ShaderRef {
        ShaderRef::Handle(GLITCH_SHADER_HANDLE)
    }

    fn fragment_shader() -> ShaderRef {
        ShaderRef::Handle(GLITCH_SHADER_HANDLE)
    }

    fn alpha_mode(&self) -> AlphaMode2d {
        AlphaMode2d::Blend
    }
}