////////////////////////////////////////////////////////////
//~ Key types

Struct(GC_FontKey)
{
  ResourceKey r;
};

////////////////////////////////////////////////////////////
//~ Atlas types

Struct(GC_Atlas)
{
  GC_Atlas *next;

  Vec2I32 dims;
  G_ResourceHandle tex_res;
  G_Texture2DRef tex;
  Vec2I32 cur_pos;
  i32 cur_row_height;
};

////////////////////////////////////////////////////////////
//~ Glyph types

Struct(GC_GlyphDesc)
{
  GC_FontKey font;
  f32 font_size;
  u32 codepoint;
};

Struct(GC_Glyph)
{
  GC_Glyph *next;

  GC_GlyphDesc desc;
  u64 hash;
  Atomic64 atlas_copy_completion_target;

  // Font info
  f32 font_size;
  f32 font_ascent;
  f32 font_descent;
  f32 font_cap;

  // Layout info
  f32 advance;
  Rng2 bounds;

  // Atlas info
  GC_Atlas *atlas;
  Rng2I32 atlas_slice;
  Rng2 atlas_slice_uv;
};

Struct(GC_GlyphBin)
{
  GC_Glyph *first;
};

////////////////////////////////////////////////////////////
//~ Run types

Struct(GC_RunRect)
{
  Rng2 bounds;        // Visual bounds in relation to the baseline
  f32 baseline_pos;   // Horizontal distance from start of baseline
  f32 advance;

  G_Texture2DRef tex;
  Rng2I32 tex_slice;
  Rng2 tex_slice_uv;
};

Struct(GC_Run)
{
  // Run data
  Rng2 bounds;  // Visual bounds of the run in relation to the baseline
  f32 baseline_length;
  u64 rects_count;
  GC_RunRect *rects;

  // Font info
  f32 font_size;
  f32 font_ascent;
  f32 font_descent;
  f32 font_cap;

  b32 ready;
};

////////////////////////////////////////////////////////////
//~ Async cmd types

Struct(GC_Cmd)
{
  GC_Glyph *glyph;

  // Async temporary data
  TTF_GlyphResult rasterized;
};

Struct(GC_CmdNode)
{
  GC_CmdNode *next;
  GC_Cmd cmd;
};

////////////////////////////////////////////////////////////
//~ State types

Struct(GC_AsyncCtx)
{
  struct
  {
    u64 count;
    GC_Cmd *v;
  } cmds;
};

Struct(GC_Ctx)
{
  Mutex glyphs_mutex;
  GC_GlyphBin glyph_bins[16384];

  u64 atlases_count;
  GC_Atlas *first_atlas;

  struct
  {
    Mutex mutex;
    u64 count;
    GC_CmdNode *first;
    GC_CmdNode *last;
    GC_CmdNode *first_free;
  } submit;

  GC_AsyncCtx async_ctx;
};

extern GC_Ctx GC;

////////////////////////////////////////////////////////////
//~ Bootstrap

void GC_Bootstrap(void);

////////////////////////////////////////////////////////////
//~ Key helpers

GC_FontKey GC_FontKeyFromResource(ResourceKey resource);
u64 GC_HashFromGlyphDesc(GC_GlyphDesc desc);

////////////////////////////////////////////////////////////
//~ Run

GC_Run GC_RunFromString32(Arena *arena, String32 str32, GC_FontKey font, f32 font_size);

////////////////////////////////////////////////////////////
//~ Async

void GC_TickAsync(WaveLaneCtx *lane, AsyncFrameLaneCtx *base_async_lane_frame);