struct DrawCommand {
  uint vertex_count;
  uint instance_count;
  uint fist_vertex;
  uint first_instance;
};

layout(std430, buffer_reference) buffer DrawCommandList {
  DrawCommand d[];
};

struct DispatchCommand {
  uint x;
  uint y;
  uint z;
};

struct Symbol {
  float top;
  float left;
  float width;
  float height;
  float advance;
};

layout(std430, buffer_reference) buffer SymbolList {
  Symbol s[];
};

struct Font {
  SymbolList symbols;
  uint num_symbols;
  uint width;
  uint height;
};

layout(std430, buffer_reference) buffer FontList {
  Font f[];
};

struct String {
  vec2 pos;
  vec4 color;
  float size;
  uint offset;
  uint len;
};

layout(std430, buffer_reference) readonly buffer StringList {
  String s[];
};

layout(std430, buffer_reference) readonly buffer CodeList {
  uint c[];
};

struct Drawable {
  vec2 pos;
  vec2 size;
  vec4 color;
  uint type;
  uint code;
};

layout(std430, buffer_reference) readonly buffer DrawableList {
  Drawable d[];
};

layout(std430, buffer_reference) readonly buffer Container {
  vec2 pos;
  vec2 size;
};

layout(std430, buffer_reference) readonly buffer Layer {
  StringList strings;
  CodeList codes;
  DrawableList drawables;

  DrawCommand draw;
  DispatchCommand dispatch;
  
  uint font_index;
  uint max_drawables;
  uint max_codes;
  uint max_strings;
  uint num_drawables;

  Container container;
};

layout(std430, buffer_reference) buffer Context {
  FontList fonts;
  vec2 scale;
};