////////////////////////////////////////////////////////////
//~ Font types

#define F_LookupTableSize (256)

Struct(F_Glyph)
{
    i32 advance;
    Vec2 baseline_offset;
    Vec2I32 atlas_p0;
    Vec2I32 atlas_p1;
};

Struct(F_Font)
{
    GPU_Resource *texture;
    u32 image_width;
    u32 image_height;
    u16 glyphs_count;
    F_Glyph *glyphs;
    u16 *lookup;

    /* Metrics */
    f32 size;
    f32 ascent;
    f32 descent;
};

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

Struct(F_RunRect)
{
    Vec2 offset;    /* Vector from baseline offset to top left of glyph rect */
    f32 pos;        /* Horizontal distance from start of baseline */
    f32 advance;
    Vec2I32 atlas_p0;
    Vec2I32 atlas_p1;
};

Struct(F_Run)
{
    Vec2 p0;    /* Start of baseline to top-left-most rect */
    Vec2 p1;    /* Start of baseline to bottom-right-most rect corner */
    u32 count;
    F_RunRect *rects;
};

////////////////////////////////////////////////////////////
//~ Font load job

JobDecl(F_Load, { AC_Asset *asset; f32 size; ResourceKey resource; });

////////////////////////////////////////////////////////////
//~ Font load operations

AC_Asset *F_LoadAsset(ResourceKey resource, f32 size, b32 wait);
F_Font *F_LoadFontAsync(ResourceKey resource, f32 size);
F_Font *F_LoadFontWait(ResourceKey resource, f32 size);

////////////////////////////////////////////////////////////
//~ Run operations

F_Glyph F_GlyphFromCodepoint(F_Font *font, u32 codepoint);
F_Run F_RunFromString(Arena *arena, F_Font *font, String str);