// The `VertexInput` location numbers match the numbers in
// `vertexBufferLayouts`
struct VertexInput {
  @location(0) position: vec3f,
  @location(1) texture: vec2f,
  @location(2) normal: vec3f,
};

// location numbers for passing values from the vertex stage to the
// fragment stage are arbitrary--they just need to match. Because
// fragmentMain uses the same VertexOutput struct that vertexMain
// returns, they do match.
struct VertexOutput {
  @builtin(position) position: vec4f,
  @location(0) texture: vec2f,
};

@vertex
fn vertexMain(input: VertexInput) -> VertexOutput
{
  let position = vec4f(input.position * 0.5, 1.0);

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

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