#include <metal_stdlib>
using namespace metal;

struct VertexOut {
  float4 position [[position]];
  float point_size [[point_size]];
};

vertex VertexOut vertex_main(constant float3 *vertices [[buffer(0)]],
                             uint id [[vertex_id]])
{
  VertexOut vertex_out {
    .position = float4(vertices[id], 1),
    .point_size = 20.0
  };
  return vertex_out;
}

fragment float4 fragment_main(constant float4 &color [[buffer(0)]])
{
  return color;
}