all void displayText()

void displayText(string text, double centerX, double centerY, double widthDiv2, double heightDiv2, string font, SDL_Color color)
{
    SDL_Surface *surface;
    if(texts.find(text) == texts.end())
    {
        //initializeText(text, text, font, color);
        //surface = TTF_RenderUTF8_Blended(fonts[font], text.c_str(), color);
        surface = TTF_RenderText_Blended(fonts[font], text.c_str(), color);
        //texts[text] = surface;
    }
    else
    {

        surface = texts[text];
    }
    surface = flipSurface(surface);
    GLuint textTexture;
    glGenTextures(1, &textTexture);
    glBindTexture(GL_TEXTURE_2D, textTexture);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    GLenum codagePixel;
    if(surface->format->Rmask == 0x000000ff)
        codagePixel = GL_RGBA;
    else
    {
        #ifndef GL_BGRA
            #define GL_BGRA 0x80E1
        #endif
        codagePixel = GL_BGRA;
    }
    if(widthDiv2 == -1) // Using by chat system
    {
        double textWidthDiv2 = surface->w / 4, textHeight = surface->h, textHeightDiv2 = textHeight / 2;
        centerX += textWidthDiv2;
        centerY += textHeightDiv2 + heightDiv2 * textHeight;
        widthDiv2 = textWidthDiv2;
        heightDiv2 = textHeightDiv2;
    }
    glTexImage2D(GL_TEXTURE_2D, 0, 4, surface->w, surface->h, 0, codagePixel, GL_UNSIGNED_BYTE, surface->pixels);
    double winW2 = getWindowWidthDiv2();
    double winH2 = getWindowHeightDiv2();
    float vertices[] = {(float)((centerX - widthDiv2) / winW2 - 1), (float)((centerY - heightDiv2) / winH2 - 1), 0,   (float)((centerX + widthDiv2) / winW2 - 1), (float)((centerY - heightDiv2) / winH2 - 1), 0,   (float)((centerX + widthDiv2) / winW2 - 1), (float)((centerY + heightDiv2) / winH2 - 1), 0,
                        (float)((centerX - widthDiv2) / winW2 - 1), (float)((centerY - heightDiv2) / winH2 - 1), 0,   (float)((centerX - widthDiv2) / winW2 - 1), (float)((centerY + heightDiv2) / winH2 - 1), 0,   (float)((centerX + widthDiv2) / winW2 - 1), (float)((centerY + heightDiv2) / winH2 - 1), 0};
    float texCoord[] = {0, 0,   1, 0,   1, 1,
                        0, 0,   0, 1,   1, 1};
    textShader.use();

    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, vertices);
    glEnableVertexAttribArray(0);

    glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0, texCoord);
    glEnableVertexAttribArray(1);

    //Set color
    textShader.setVec4("color", glm::vec4(color.r / 255.0f, color.g / 255.0f, color.b / 255.0f, color.a / 255.0f));

    glDrawArrays(GL_TRIANGLES, 0, 6);

    glBindTexture(GL_TEXTURE_2D, 0);
    glDisableVertexAttribArray(1);
    glDisableVertexAttribArray(0);
    glUseProgram(0);

    SDL_FreeSurface(surface);
    glDeleteTextures(1, &textTexture);
}

void displayText(unsigned char nb, double centerX, double centerY, double widthDiv2, double heightDiv2, string font, SDL_Color color)
{
    displayText(convertNbToStr(nb), centerX, centerY, widthDiv2, heightDiv2, font, color);
}

void displayText(GLuint textTexture, double centerX, double centerY, double widthDiv2, double heightDiv2, SDL_Color color)
{
    glBindTexture(GL_TEXTURE_2D, textTexture);

    if(widthDiv2 == -1)
    {
        GLint height, width;
        glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &height);
        glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &width);
        widthDiv2 = width / 2;
        heightDiv2 = height / 2;
    }

    double winW2 = getWindowWidthDiv2();
    double winH2 = getWindowHeightDiv2();
    float vertices[] = {(float)((centerX - widthDiv2) / winW2 - 1), (float)((centerY - heightDiv2) / winH2 - 1), 0,   (float)((centerX + widthDiv2) / winW2 - 1), (float)((centerY - heightDiv2) / winH2 - 1), 0,   (float)((centerX + widthDiv2) / winW2 - 1), (float)((centerY + heightDiv2) / winH2 - 1), 0,
                        (float)((centerX - widthDiv2) / winW2 - 1), (float)((centerY - heightDiv2) / winH2 - 1), 0,   (float)((centerX - widthDiv2) / winW2 - 1), (float)((centerY + heightDiv2) / winH2 - 1), 0,   (float)((centerX + widthDiv2) / winW2 - 1), (float)((centerY + heightDiv2) / winH2 - 1), 0};
    float texCoord[] = {0, 0,   1, 0,   1, 1,
                        0, 0,   0, 1,   1, 1};
    textShader.use();

    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, vertices);
    glEnableVertexAttribArray(0);

    glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0, texCoord);
    glEnableVertexAttribArray(1);

    //Set color
    textShader.setVec4("color", glm::vec4(color.r / 255.0f, color.g / 255.0f, color.b / 255.0f, color.a / 255.0f));

    glDrawArrays(GL_TRIANGLES, 0, 6);

    glBindTexture(GL_TEXTURE_2D, 0);
    glDisableVertexAttribArray(1);
    glDisableVertexAttribArray(0);
    glUseProgram(0);
}