/* date = May 7th 2023 10:16 am */

#ifndef VN_FONT_H
#define VN_FONT_H

enum font_id
{
    Font_Regular,
    Font_Bold,
    Font_Monospace,
    Font_Icons,
    
    Font_Count,
};

#define FontIcon_None             0x0000
#define FontIcon_Pencil           0xe800
#define FontIcon_Forward          0xe801
#define FontIcon_Book             0xe802
#define FontIcon_FolderOpen       0xe803
#define FontIcon_Wrench           0xe804
#define FontIcon_CW               0xe805
#define FontIcon_CCW              0xe806
#define FontIcon_ArrowsCW         0xe807
#define FontIcon_ResizeVertical   0xe808
#define FontIcon_ResizeHorizontal 0xe809
#define FontIcon_Play             0xe80a
#define FontIcon_Stop             0xe80b
#define FontIcon_Floppy           0xe80c
#define FontIcon_Pause            0xe80d
#define FontIcon_Folder           0xe80e
#define FontIcon_Cog              0xe80f
#define FontIcon_Attention        0xe810
#define FontIcon_Cancel           0xe811
#define FontIcon_Filter           0xf0b0
#define FontIcon_Menu             0xf0c9
#define FontIcon_CircleEmpty      0xf10c
#define FontIcon_Circle           0xf111
#define FontIcon_Reply            0xf112
#define FontIcon_Terminal         0xf120
#define FontIcon_Ellipsis         0xf141
#define FontIcon_Document         0xf15b
#define FontIcon_DocumentText     0xf15c
#define FontIcon_Eyedropper       0xf1fb
#define FontIcon_WindowMaximize   0xf2d0
#define FontIcon_WindowMinimize   0xf2d1
#define FontIcon_WindowRestore    0xf2d2
#define FontIcon_WindowClose      0xf2d4
#define FontIcon_DownDir          0xe812
#define FontIcon_UpDir            0xe813
#define FontIcon_LeftDir          0xe814
#define FontIcon_RightDir         0xe815
#define FontIcon_TextAlignLeft    0xe816
#define FontIcon_TextAlignCenter  0xe817
#define FontIcon_TextAlignRight   0xe818

struct glyph
{
    glyph *LRUNext;
    glyph *LRUPrev;
    
    font_id Font;
    u32 Codepoint;
    r32 Size;
    s32 Subpixel;
    
    v2s P0;
    v2s P1;
    v2 Offset;
    r32 Advance;
};

#define DEFAULT_GLYPH_ATLAS_DIM 1024
#define MAX_GLYPH_SIZE 64

#define STB_TRUETYPE_IMPLEMENTATION
#include "third_party/stb_truetype.h"

struct loaded_font
{
    stbtt_fontinfo Info;
    string Data;
    
    s32 Ascent;
    s32 Descent;
    s32 LineGap;
};

struct glyph_atlas
{
    memory_arena Arena;
    
    s32 MaxGlyphCount;
    s32 GlyphsUsed;
    glyph *Glyphs;
    
    glyph *LRUFirst;
    glyph *LRULast;
    
    vn_render_commands *RenderCommands;
    render_handle Texture;
    
    u8 *BitmapBuffer;
    s32 BitmapSize;
    s32 GlyphSize;
    
    loaded_font Fonts[Font_Count];
};

#endif //VN_FONT_H