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/**
* @file text.hpp
* Manages entity text.
*
* Copyright (C) 2019 Clyne Sullivan
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
// hello
#ifndef SYSTEM_TEXT_HPP_
#define SYSTEM_TEXT_HPP_
#include <entityx/entityx.h>
#include <ft2build.h>
#include <freetype/freetype.h>
#include <GL/glew.h>
#include <SDL2/SDL_opengl.h>
#include <map>
#include <string>
#include <tuple>
#include <vector>
struct TextMeshData
{
float posX, posY, posZ;
float texX, texY;
float transparency;
} __attribute__ ((packed));
struct FT_Info {
std::pair<float, float> offset;
std::pair<float, float> dim;
std::pair<float, float> bitmap;
std::pair<float, float> advance;
};
struct Text {
std::string text;
float x;
float y;
float z;
Text(std::string _text, float _x, float _y, float _z = 0.0f) :
text(_text), x(_x), y(_y), z(_z) {}
};
// Stores texture and placement data for a font at a size.
struct Font {
int fontSize;
GLuint tex;
GLuint vbo;
float width;
float height;
std::array<FT_Info, 96> data;
// Stores currently shown text at given index into VBO?
std::vector<Text> text;
std::basic_string<TextMeshData> buffer;
};
class TextSystem : public entityx::System<TextSystem>
{
public:
/**
* Prepares the system for running.
*/
void configure(entityx::EntityManager& entities,
entityx::EventManager& events) final;
/**
* Draws the text for all entities.
*/
void update(entityx::EntityManager& entites,
entityx::EventManager& events,
entityx::TimeDelta dt) final;
void put(const std::string& font, float x, float y, const std::string& text);
void loadFont(const std::string& name, const std::string& file, int size);
private:
FT_Library freetype;
std::map<std::string, FT_Face> fonts;
std::map<std::string, Font> fontData;
bool shouldUpdateVBOs;
void updateVBOs(void);
};
#endif // SYSTEM_TEXT_HPP_
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