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

Struct(GC_FontKey)
{
    ResourceKey r;
};

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

Struct(GC_Atlas)
{
    GC_Atlas *next;

    Vec2I32 dims;
    G_ResourceHandle tex;
    G_Texture2DRef tex_ref;
    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 async_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 tex_slice;
    Rng2 tex_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;
};

////////////////////////////////////////////////////////////
//~ Cmd types

Struct(GC_Cmd)
{
    GC_Glyph *glyph;

    /* Async temporary data */
    TTF_GlyphResult rasterized;
};

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

////////////////////////////////////////////////////////////
//~ Context 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_RunFromString(Arena *arena, String str, GC_FontKey font, f32 font_size);

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

void GC_TickAsync(WaveLaneCtx *lane, AsyncTickCtx *ctx);