struct Hex {
  float heights[6];
  uint  colors[6];
};

layout(std430, buffer_reference) readonly buffer HexList {
  Hex h[];
};

struct Region {
  uint x;
  uint y;
  HexList hexes;  
};

layout(std430, buffer_reference) readonly buffer RegionList {
  Region r[];
};

layout(std430, buffer_reference) readonly buffer HexContext {
  mat4 proj;
  mat4 view;
  RegionList regions;
};

layout(std430, push_constant) uniform PushConstant {
  HexContext context;
  float time;
} pc;