struct Configuration {
  viewProj: mat4x4f,
  lightViewProj: mat4x4f,
  lightPosition: vec4f,
  eyePosition: vec4f,
  aspect: f32,
};

struct GlyphBitmap {
  position: vec2f,
  velocity: vec2f,
};

@group(0) @binding(0) var<uniform> config: Configuration;
@group(1) @binding(0) var<storage> glyphs: array<GlyphBitmap>;

struct VertexInput {
  @builtin(vertex_index) vertex_index: u32,
};

struct VertexOutput {
  @builtin(position) position: vec4f,
  @location(0) texture: vec2f,
};

const vertices = array(
  vec2f(1.0, 0.0),
  vec2f(0.0, 1.0),
  vec2f(0.0, 0.0),
  vec2f(1.0, 1.0),
);

@vertex
fn vertexMain(input: VertexInput) -> VertexOutput
{
  let texture = vertices[input.vertex_index];

  let position = texture * 2.0 - 1.0;

  var output: VertexOutput;
  output.position = vec4f(position, 0.0, 1.0);
  output.texture = position * vec2f(config.aspect, 1);
  return output;
}

@fragment
fn fragmentMain(input: VertexOutput) -> @location(0) vec4f
{
  var color = vec3f(input.texture.xy, 0);

  return vec4f(color, 1);
}