atlas.h

#ifndef _ATLASH_H
#define _ATLASH_H 

#include "glutil.h"
#include "actionmode.h"

#include <freetype2/ft2build.h>
#include FT_FREETYPE_H

#include <string>
#include <unordered_map>

struct char_info_t {
    float left, top;
    float width, height;
    float ax, ay; //advanced
    float offset; // horizontal offset inside atlas
};

struct atlas_t {
    float width, height;
    //struct char_info_t infos[128];    
    std::unordered_map<FT_ULong, struct char_info_t> infos;
    int point_size;
};

struct text_mode_t {
    struct atlas_t atlas;
    GLProcess proc;
};

class TextMode: public ActionMode {
    public:
        bool init(int width, int height);
        void deinit();
        void render();
        void setFontPath(const std::string& path);

    private:
        atlas_t _atlas;
        std::string _fontPath;

        void create_atlas(FT_Face face, int pointSize, std::string preloads);
        void render_str(std::string s, float x, float y, float sx, float sy);
        bool load_char_helper(FT_ULong char_code);
};

#endif