// GPU procedural grid pattern generator.
// Simple grid lines with configurable spacing and thickness.

struct GridParams {
  width: u32,
  height: u32,
  grid_size: u32,
  thickness: u32,
}

@group(0) @binding(0) var output_tex: texture_storage_2d<rgba8unorm, write>;
@group(0) @binding(1) var<uniform> params: GridParams;

@compute @workgroup_size(8, 8, 1)
fn main(@builtin(global_invocation_id) id: vec3<u32>) {
  if (id.x >= params.width || id.y >= params.height) { return; }

  let on_line = (id.x % params.grid_size) < params.thickness ||
                (id.y % params.grid_size) < params.thickness;

  let val = select(0.0, 1.0, on_line);

  textureStore(output_tex, id.xy, vec4<f32>(val, val, val, 1.0));
}