Font.hpp

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#pragma once

#include "Sprite.hpp" 

struct Glyph
{
    vec2 texCoord1;     
    vec2 texCoord2;     
    vec2 size;          
    vec2 advance;       
    vec2 location;      
};

class Font
{
    typedef map<char, Glyph> glyph_map;

    TextRenderer*   m_textRenderer;     
    string          m_name;             
    uint            m_size;             
    uvec2           m_atlasSize;        
    vector<char>    m_atlasData;        
    uint            m_atlas;            
    glyph_map       m_glyphs;           
    float           m_lineHeight;       
    friend class TextRenderer;

    public:
        float lineHeight() const { return m_lineHeight; }

    private:
        void prepare(string const & text);

    public:
        Font(TextRenderer* textRenderer, string const & fontName, const uint fontSize);
        virtual ~Font();

        void draw(string const & text, vec4 const & color, vec2 position, HAlign hAlign = HAlign::Left, VAlign vAlign = VAlign::Bottom, vec2 const & scale = vec2(1,1));
        vec2 measure(string const & text);
};




class TextRenderer
{
    typedef map<string,unique_ptr<Font>> font_map;
        
    Application*    m_app;              
    FT_Library      m_ftLib;            
    font_map        m_fonts;            
    Shader*         m_shader;           
    vector<vec4>    m_vertices;         
    GLuint          m_verticesBuffer;   
    GLuint          m_vao;              
    friend class Font;

    private:
        void drawBuffer();

    public: 
        TextRenderer(Application* app);
        virtual ~TextRenderer();

        Font* getFont(string const & name, uint const size);

        void begin();
        void end();
};