text drawing

void draw_text(const char* txt, int x, int y, float scale, float spacing, bool is_precise, GLuint font){
    string s = txt;
    float tx = 0.0;
    float ty = 0.0;
    float letter_offset;
    if (is_precise){
        letter_offset = 0.0;
    }
    else {
        letter_offset = (s.size()/2)*(-spacing*scale);
    }
    glBindTexture(GL_TEXTURE_2D,font);
    glBegin(GL_QUADS);
    for (int i = 0; i < s.size(); i ++){
        if (s.substr(i,1).compare("A") == 0){
            tx = 0.0;
            ty = 0.0;
        }
        else if (s.substr(i,1).compare("B") == 0){
            tx = 1.0;
            ty = 0.0;
        }
        else if (s.substr(i,1).compare("C") == 0){
            tx = 2.0;
            ty = 0.0;
        }
        else if (s.substr(i,1).compare("D") == 0){
            tx = 3.0;
            ty = 0.0;
        }
        else if (s.substr(i,1).compare("E") == 0){
            tx = 4.0;
            ty = 0.0;
        }
        else if (s.substr(i,1).compare("F") == 0){
            tx = 5.0;
            ty = 0.0;
        }
        else if (s.substr(i,1).compare("G") == 0){
            tx = 6.0;
            ty = 0.0;
        }
        else if (s.substr(i,1).compare("H") == 0){
            tx = 7.0;
            ty = 0.0;
        }
        else if (s.substr(i,1).compare("I") == 0){
            tx = 8.0;
            ty = 0.0;
        }
        else if (s.substr(i,1).compare("J") == 0){
            tx = 9.0;
            ty = 0.0;
        }
        else if (s.substr(i,1).compare("K") == 0){
            tx = 10.0;
            ty = 0.0;
        }
        else if (s.substr(i,1).compare("L") == 0){
            tx = 11.0;
            ty = 0.0;
        }
        else if (s.substr(i,1).compare("M") == 0){
            tx = 12.0;
            ty = 0.0;
        }
        else if (s.substr(i,1).compare("N") == 0){
            tx = 13.0;
            ty = 0.0;
        }
        else if (s.substr(i,1).compare("O") == 0){
            tx = 14.0;
            ty = 0.0;
        }
        else if (s.substr(i,1).compare("P") == 0){
            tx = 15.0;
            ty = 0.0;
        }
        else if (s.substr(i,1).compare("Q") == 0){
            tx = 0.0;
            ty = 1.0;
        }
        else if (s.substr(i,1).compare("R") == 0){
            tx = 1.0;
            ty = 1.0;
        }
        else if (s.substr(i,1).compare("S") == 0){
            tx = 2.0;
            ty = 1.0;
        }
        else if (s.substr(i,1).compare("T") == 0){
            tx = 3.0;
            ty = 1.0;
        }
        else if (s.substr(i,1).compare("U") == 0){
            tx = 4.0;
            ty = 1.0;
        }
        else if (s.substr(i,1).compare("V") == 0){
            tx = 5.0;
            ty = 1.0;
        }
        else if (s.substr(i,1).compare("W") == 0){
            tx = 6.0;
            ty = 1.0;
        }
        else if (s.substr(i,1).compare("X") == 0){
            tx = 7.0;
            ty = 1.0;
        }
        else if (s.substr(i,1).compare("Y") == 0){
            tx = 8.0;
            ty = 1.0;
        }
        else if (s.substr(i,1).compare("Z") == 0){
            tx = 9.0;
            ty = 1.0;
        }
        else if (s.substr(i,1).compare("a") == 0){
            tx = 10.0;
            ty = 1.0;
        }
        else if (s.substr(i,1).compare("b") == 0){
            tx = 11.0;
            ty = 1.0;
        }
        else if (s.substr(i,1).compare("c") == 0){
            tx = 12.0;
            ty = 1.0;
        }
        else if (s.substr(i,1).compare("d") == 0){
            tx = 13.0;
            ty = 1.0;
        }
        else if (s.substr(i,1).compare("e") == 0){
            tx = 14.0;
            ty = 1.0;
        }
        else if (s.substr(i,1).compare("f") == 0){
            tx = 15.0;
            ty = 1.0;
        }
        else if (s.substr(i,1).compare("g") == 0){
            tx = 0.0;
            ty = 2.0;
        }
        else if (s.substr(i,1).compare("h") == 0){
            tx = 1.0;
            ty = 2.0;
        }
        else if (s.substr(i,1).compare("i") == 0){
            tx = 2.0;
            ty = 2.0;
        }
        else if (s.substr(i,1).compare("j") == 0){
            tx = 3.0;
            ty = 2.0;
        }
        else if (s.substr(i,1).compare("k") == 0){
            tx = 4.0;
            ty = 2.0;
        }
        else if (s.substr(i,1).compare("l") == 0){
            tx = 5.0;
            ty = 2.0;
        }
        else if (s.substr(i,1).compare("m") == 0){
            tx = 6.0;
            ty = 2.0;
        }
        else if (s.substr(i,1).compare("n") == 0){
            tx = 7.0;
            ty = 2.0;
        }
        else if (s.substr(i,1).compare("o") == 0){
            tx = 8.0;
            ty = 2.0;
        }
        else if (s.substr(i,1).compare("p") == 0){
            tx = 9.0;
            ty = 2.0;
        }
        else if (s.substr(i,1).compare("q") == 0){
            tx = 10.0;
            ty = 2.0;
        }
        else if (s.substr(i,1).compare("r") == 0){
            tx = 11.0;
            ty = 2.0;
        }
        else if (s.substr(i,1).compare("s") == 0){
            tx = 12.0;
            ty = 2.0;
        }
        else if (s.substr(i,1).compare("t") == 0){
            tx = 13.0;
            ty = 2.0;
        }
        else if (s.substr(i,1).compare("u") == 0){
            tx = 14.0;
            ty = 2.0;
        }
        else if (s.substr(i,1).compare("v") == 0){
            tx = 15.0;
            ty = 2.0;
        }
        else if (s.substr(i,1).compare("w") == 0){
            tx = 0.0;
            ty = 3.0;
        }
        else if (s.substr(i,1).compare("x") == 0){
            tx = 1.0;
            ty = 3.0;
        }
        else if (s.substr(i,1).compare("y") == 0){
            tx = 2.0;
            ty = 3.0;
        }
        else if (s.substr(i,1).compare("z") == 0){
            tx = 3.0;
            ty = 3.0;
        }
        else if (s.substr(i,1).compare("1") == 0){
            tx = 4.0;
            ty = 3.0;
        }
        else if (s.substr(i,1).compare("2") == 0){
            tx = 5.0;
            ty = 3.0;
        }
        else if (s.substr(i,1).compare("3") == 0){
            tx = 6.0;
            ty = 3.0;
        }
        else if (s.substr(i,1).compare("4") == 0){
            tx = 7.0;
            ty = 3.0;
        }
        else if (s.substr(i,1).compare("5") == 0){
            tx = 8.0;
            ty = 3.0;
        }
        else if (s.substr(i,1).compare("6") == 0){
            tx = 9.0;
            ty = 3.0;
        }
        else if (s.substr(i,1).compare("7") == 0){
            tx = 10.0;
            ty = 3.0;
        }
        else if (s.substr(i,1).compare("8") == 0){
            tx = 11.0;
            ty = 3.0;
        }
        else if (s.substr(i,1).compare("9") == 0){
            tx = 12.0;
            ty = 3.0;
        }
        else if (s.substr(i,1).compare("0") == 0){
            tx = 13.0;
            ty = 3.0;
        }
        else if (s.substr(i,1).compare(" ") == 0){
            tx = 14.0;
            ty = 3.0;
        }
        else if (s.substr(i,1).compare(".") == 0){
            tx = 15.0;
            ty = 3.0;
        }
        else if (s.substr(i,1).compare(",") == 0){
            tx = 0.0;
            ty = 4.0;
        }
        else if (s.substr(i,1).compare("!") == 0){
            tx = 1.0;
            ty = 4.0;
        }
        else if (s.substr(i,1).compare("?") == 0){
            tx = 2.0;
            ty = 4.0;
        }
        else if (s.substr(i,1).compare("(") == 0){
            tx = 3.0;
            ty = 4.0;
        }
        else if (s.substr(i,1).compare(")") == 0){
            tx = 4.0;
            ty = 4.0;
        }
        else if (s.substr(i,1).compare("[") == 0){
            tx = 5.0;
            ty = 4.0;
        }
        else if (s.substr(i,1).compare("]") == 0){
            tx = 6.0;
            ty = 4.0;
        }
        else if (s.substr(i,1).compare("-") == 0){
            tx = 7.0;
            ty = 4.0;
        }
        else if (s.substr(i,1).compare("_") == 0){
            tx = 8.0;
            ty = 4.0;
        }
        else if (s.substr(i,1).compare("/") == 0){
            tx = 9.0;
            ty = 4.0;
        }
        else if (s.substr(i,1).compare("\\") == 0){
            tx = 10.0;
            ty = 4.0;
        }
        else if (s.substr(i,1).compare("|") == 0){
            tx = 11.0;
            ty = 4.0;
        }
        else if (s.substr(i,1).compare(":") == 0){
            tx = 12.0;
            ty = 4.0;
        }
        else if (s.substr(i,1).compare(";") == 0){
            tx = 13.0;
            ty = 4.0;
        }
        else if (s.substr(i,1).compare("=") == 0){
            tx = 14.0;
            ty = 4.0;
        }
        else if (s.substr(i,1).compare("%") == 0){
            tx = 15.0;
            ty = 4.0;
        }
        /*glTexCoord2f(((tx+1)/74.0),0.0); glVertex2f(x+letter_offset,y);
        glTexCoord2f(((tx+1)/74.0),1.0/64.0); glVertex2f(x+8+letter_offset,y);
        glTexCoord2f(((tx+2)/74.0),1.0/64.0); glVertex2f(x+8+letter_offset,y+8);
        glTexCoord2f(((tx+2)/74.0),0.0); glVertex2f(x+letter_offset,y+8);*/
        /*v2 lettertex = _v2(((int)tx) % 16,(int)round(tx/16));
        glTexCoord2f(lettertex.y/16.0,lettertex.x/16.0); glVertex2f(x+letter_offset,y);
        glTexCoord2f((lettertex.y+1)/16.0,(lettertex.x+1)/16.0); glVertex2f(x+8+letter_offset,y);
        glTexCoord2f((lettertex.y+1)/16.0,(lettertex.x+1)/16.0); glVertex2f(x+8+letter_offset,y+8);
        glTexCoord2f(lettertex.y/16.0,lettertex.x/16.0); glVertex2f(x+letter_offset,y+8);*/

        glTexCoord2f((ty)/16.0,(tx-(int)floor(tx/16.0))/16.0); glVertex2f(x+letter_offset,y);
        glTexCoord2f((ty+1.0)/16.0,(tx-(int)floor(tx/16.0))/16.0); glVertex2f(x+letter_offset,y+(8*scale));
        glTexCoord2f((ty+1.0)/16.0,((tx-(int)floor(tx/16.0))+1.0)/16.0); glVertex2f(x+(8*scale)+letter_offset,y+(8*scale));
        glTexCoord2f((ty)/16.0,((tx-(int)floor(tx/16.0))+1.0)/16.0); glVertex2f(x+(8*scale)+letter_offset,y);
        letter_offset += spacing*scale;
    }
    glEnd();
    glBindTexture(GL_TEXTURE_2D,0);
}