flecs_tests/src/shaders/display.wgsl

struct Uniforms {
    pan: vec2f,
    zoom: f32,
}
struct TileParams {
    lod: u32,
    tile_size: f32,
    world_min: vec2f,
    world_max: vec2f,
}

@group(0) @binding(0) var<uniform> uniforms: Uniforms;
@group(0) @binding(1) var<uniform> tile_params: TileParams;

@vertex fn vs_main(@builtin(vertex_index) vertex_index : u32) -> @builtin(position) vec4f {
  const pos = array(
    vec2( 0.0,  0.5),
    vec2(-0.5, -0.5),
    vec2( 0.5, -0.5)
  );

  return vec4f(pos[vertex_index], 0, 1);
}

@fragment fn fs_main() -> @location(0) vec4f {
  return vec4(1, 0, 0, 1);
}