int advance_width = 0, left_side_bearing = 0, kerning = 0;
stbtt_GetCodepointHMetrics(&m_font, text[i], &advance_width, &left_side_bearing);
int advance_width = 0, left_side_bearing = 0, kerning = 0;
stbtt_GetCodepointHMetrics(&m_font, text[i], &advance_width, &left_side_bearing);