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spectral

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spectral
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pub const BG_VERTEX: &str = r#"
struct BgInstance {
    col: u32, row: u32,
    bg_r: u32, bg_g: u32, bg_b: u32, bg_a: u32,
};
@group(0) @binding(0)
var<storage, read> instances: array<BgInstance>;

struct Uniforms {
    cell_width: f32, cell_height: f32,
    screen_cols: u32, screen_rows: u32,
};
@group(0) @binding(1)
var<uniform> uniforms: Uniforms;

struct VertexOutput {
    @builtin(position) position: vec4<f32>,
    @location(0) color: vec4<f32>,
};

@vertex
fn main(@builtin(vertex_index) vertex_idx: u32, @builtin(instance_index) instance_idx: u32) -> VertexOutput {
    let cell = instances[instance_idx];
    var corners = array<vec2<f32>, 6>(
        vec2<f32>(0.0, 0.0), vec2<f32>(1.0, 0.0), vec2<f32>(0.0, 1.0),
        vec2<f32>(0.0, 1.0), vec2<f32>(1.0, 0.0), vec2<f32>(1.0, 1.0),
    );
    let corner = corners[vertex_idx];
    let x = (f32(cell.col) + corner.x) * uniforms.cell_width;
    let y = (f32(cell.row) + corner.y) * uniforms.cell_height;
    let screen_w = f32(uniforms.screen_cols) * uniforms.cell_width;
    let screen_h = f32(uniforms.screen_rows) * uniforms.cell_height;
    let ndc_x = (x / screen_w) * 2.0 - 1.0;
    let ndc_y = -((y / screen_h) * 2.0 - 1.0);
    var out: VertexOutput;
    out.position = vec4<f32>(ndc_x, ndc_y, 0.0, 1.0);
    out.color = vec4<f32>(f32(cell.bg_r) / 255.0, f32(cell.bg_g) / 255.0, f32(cell.bg_b) / 255.0, f32(cell.bg_a) / 255.0);
    return out;
}
"#;

pub const BG_FRAGMENT: &str = r#"
struct VertexOutput {
    @builtin(position) position: vec4<f32>,
    @location(0) color: vec4<f32>,
};
@fragment
fn main(in: VertexOutput) -> @location(0) vec4<f32> {
    return in.color;
}
"#;

pub const TEXT_VERTEX: &str = r#"
struct TextInstance {
    col: f32, row: f32,
    bearing_x: f32, bearing_y: f32,
    glyph_w: f32, glyph_h: f32,
    atlas_x: f32, atlas_y: f32,
    atlas_w: f32, atlas_h: f32,
    fg_r: u32, fg_g: u32, fg_b: u32,
    flags: u32, thickening: f32,
};
@group(0) @binding(0)
var<storage, read> instances: array<TextInstance>;

struct Uniforms {
    cell_width: f32, cell_height: f32,
    atlas_size: f32,
    screen_cols: u32, screen_rows: u32,
};
@group(0) @binding(1)
var<uniform> uniforms: Uniforms;

struct VertexOutput {
    @builtin(position) position: vec4<f32>,
    @location(0) uv: vec2<f32>,
    @location(1) fg_color: vec4<f32>,
    @location(2) atlas_uv: vec4<f32>,
    @location(3) thickening: f32,
    @location(4) flags: u32,
};

@vertex
fn main(@builtin(vertex_index) vertex_idx: u32, @builtin(instance_index) instance_idx: u32) -> VertexOutput {
    let cell = instances[instance_idx];
    var corners = array<vec2<f32>, 6>(
        vec2<f32>(0.0, 0.0), vec2<f32>(1.0, 0.0), vec2<f32>(0.0, 1.0),
        vec2<f32>(0.0, 1.0), vec2<f32>(1.0, 0.0), vec2<f32>(1.0, 1.0),
    );
    let corner = corners[vertex_idx];
    let x = (cell.col * uniforms.cell_width) + cell.bearing_x + corner.x * cell.glyph_w;
    let y = (cell.row * uniforms.cell_height) + cell.bearing_y + corner.y * cell.glyph_h;
    let screen_w = f32(uniforms.screen_cols) * uniforms.cell_width;
    let screen_h = f32(uniforms.screen_rows) * uniforms.cell_height;
    let ndc_x = (x / screen_w) * 2.0 - 1.0;
    let ndc_y = -((y / screen_h) * 2.0 - 1.0);
    var out: VertexOutput;
    out.position = vec4<f32>(ndc_x, ndc_y, 0.0, 1.0);
    out.uv = corner;
    out.fg_color = vec4<f32>(f32(cell.fg_r) / 255.0, f32(cell.fg_g) / 255.0, f32(cell.fg_b) / 255.0, 1.0);
    let norm = uniforms.atlas_size;
    out.atlas_uv = vec4<f32>(cell.atlas_x / norm, cell.atlas_y / norm, cell.atlas_w / norm, cell.atlas_h / norm);
    out.thickening = cell.thickening;
    out.flags = cell.flags;
    return out;
}
"#;

pub const TEXT_FRAGMENT: &str = r#"
@group(0) @binding(2)
var atlas_sampler: sampler;
@group(0) @binding(3)
var atlas_texture: texture_2d<f32>;

struct VertexOutput {
    @builtin(position) position: vec4<f32>,
    @location(0) uv: vec2<f32>,
    @location(1) fg_color: vec4<f32>,
    @location(2) atlas_uv: vec4<f32>,
    @location(3) thickening: f32,
    @location(4) flags: u32,
};

fn median(r: f32, g: f32, b: f32) -> f32 {
    return max(min(r, g), min(max(r, g), b));
}

@fragment
fn main(in: VertexOutput) -> @location(0) vec4<f32> {
    let atlas_pos = vec2<f32>(
        in.atlas_uv.x + in.uv.x * in.atlas_uv.z,
        in.atlas_uv.y + in.uv.y * in.atlas_uv.w,
    );
    let sample = textureSample(atlas_texture, atlas_sampler, atlas_pos);
    let sig_dist = median(sample.r, sample.g, sample.b);
    let threshold = 0.5 - in.thickening * 0.15;
    let smoothing = 0.05;
    let opacity = smoothstep(threshold - smoothing, threshold + smoothing, sig_dist);
    let is_colored = (in.flags & 0x0040u) != 0u;
    if is_colored {
        return vec4<f32>(sample.rgb, opacity);
    } else {
        return vec4<f32>(in.fg_color.rgb, opacity);
    }
}
"#;