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

@group(0) @binding(0) var<uniform> config: Configuration;

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 = vec4f(texture * 2.0 - 1.0, 0.0, 1.0);

  var output: VertexOutput;
  output.position = position;
  output.texture = texture;
  return output;
}

@fragment
fn fragmentMain(input: VertexOutput) -> @location(0) vec4f
{
  return vec4(input.texture, 0.0, 1.0);
}