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#include "font.h"
#include <iostream>
Font::Font(const std::string filepath){
FT_Library ft;
if (FT_Init_FreeType(&ft))
{
std::cout << "ERROR::FREETYPE: Could not init FreeType Library" << std::endl;
}
FT_Face face;
if (FT_New_Face(ft, filepath.data(), 0, &face))
{
std::cout << "ERROR::FREETYPE: Failed to load font" << std::endl;
}
FT_Set_Pixel_Sizes(face, 0, 48);
glPixelStorei(GL_UNPACK_ALIGNMENT, 1); // disable byte-alignment restriction
for (unsigned char c = 0; c < 128; c++)
{
createGlyphTexture(c, face);
}
glPixelStorei(GL_UNPACK_ALIGNMENT, 4); // Back to default value
FT_Done_Face(face);
FT_Done_FreeType(ft);
}
Font::~Font(){
}
void Font::createGlyphTexture(unsigned char c, FT_Face &face){
if (FT_Load_Char(face, c, FT_LOAD_RENDER))
{
std::cout << "ERROR::FREETYTPE: Failed to load Glyph" << std::endl;
return;
}
// generate texture
unsigned int texture;
glGenTextures(1, &texture);
glBindTexture(GL_TEXTURE_2D, texture);
glTexImage2D(
GL_TEXTURE_2D,
0,
GL_RED,
face->glyph->bitmap.width,
face->glyph->bitmap.rows,
0,
GL_RED,
GL_UNSIGNED_BYTE,
face->glyph->bitmap.buffer
);
// set texture options
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
// now store character for later use
unsigned int advance = static_cast<unsigned int>(face->glyph->advance.x);
Character character = {
texture,
glm::ivec2(face->glyph->bitmap.width, face->glyph->bitmap.rows),
glm::ivec2(face->glyph->bitmap_left, face->glyph->bitmap_top),
advance
};
m_characters.insert(std::pair<char, Character>(c, character));
}
Character& Font::getCharacter(char c){
return m_characters[c];
}
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