SpriteFont.h

#ifndef NTA_SPRITEFONT_H_INCLUDED
#define NTA_SPRITEFONT_H_INCLUDED
 
#include <map>
 
#include <SDL2/SDL_ttf.h>
 
#include "nta/SpriteBatch.h"
 
#define FIRST_PRINTABLE_CHAR ((char)32)  //space
#define LAST_PRINTABLE_CHAR  ((char)126) //~
#define NUM_PRINTABLE_CHARS  (LAST_PRINTABLE_CHAR-FIRST_PRINTABLE_CHAR+1)
#define SPRITE_FONT_TAB_SIZE 4
 
namespace nta {
    class SpriteFont;
    class ContextData;
    struct CharGlyph {
        glm::vec4 uvRect;
        glm::vec2 size;
    };
    class FontMap {
    private:
        struct CharRect {
            CharRect(){}
            CharRect(glm::vec2 tl, glm::vec2 d, bool a) : topLeft(tl), dimensions(d), addedToMap(a) {
            }
            glm::vec2 topLeft;
            glm::vec2 dimensions;
            bool addedToMap;
        };
        bool isOverlapping(const CharRect& rect) const;
        CharRect* m_rects = nullptr;
    public:
        FontMap();
        ~FontMap();
        glm::vec2 getBoundingDimensions() const;
        void addRect(char c, crvec2 dimensions);
        void position();
 
        friend SpriteFont;
    };
    class SpriteFont {
    private:
        void init(TTF_Font* font);
        CharGlyph* m_charGlyphs = nullptr;
        GLuint m_texId = 0;
        int m_fontHeight = 0;
    public:
        SpriteFont() {}
        ~SpriteFont() { destroy(); }
        glm::vec2 measure(crstring text) const;
        int font_height() const { return m_fontHeight; }
        GLuint getTexture() const { return m_texId; }
        void drawText(SpriteBatch& batch, crstring text, crvec2 topLeft, crvec2 scale,
                      crvec4 color = glm::vec4(1), float depth = NTA_DEFAULT_DEPTH) const;
        void drawText(SpriteBatch& batch, crstring text, crvec4 posRect, crvec4 color = glm::vec4(1),
                      float depth = NTA_DEFAULT_DEPTH) const;
        void drawText(SpriteBatch& batch, crvec2 corner1, crvec2 corner2, crstring text,
                      crvec4 color = glm::vec4(1), float depth = NTA_DEFAULT_DEPTH) const;
        void drawTexture(SpriteBatch& batch, crvec4 posRect = glm::vec4(-100, 100, 200, 200)) const;
        void destroy();
        friend ContextData;
    };
}
 
#endif // NTA_SPRITEFONT_H_INCLUDED