Messages

1

General / Re: Displaying more-and-more (sf::)texts slows the program down rapidly.

« on: October 29, 2014, 08:18:50 am »

Thanks guys for the replies. Didn't know that creating objects on the fly would have *this* much impact on performance. Also thanks, Ixrec, on the #pragma-ing. 

2

General / Displaying more-and-more (sf::)texts slows the program down rapidly.

« on: October 28, 2014, 07:23:39 pm »

Hello.

I'am trying to make a roguelike game, and i'll need quite a few sf::Texts to display messages, the interface, the dungeon, etc. When i tried to add more string to display the game dropped from ~400 fps to ~100 after 5-6 extra texts. Adding ten or so slowed the game down to 30-40 fps. I made a "small" example program in the vein of what iam doing in my main program. Here i start with 4000 or so fps and adding 20 sf::Texts to display slows it down to ~200. I tried appending text to a single string to display with one sf::Text, but the resoult was the same.  Is displaying text this costly? Or iam doing something wrong?

Test Code Below.

(click to show/hide)

#define SFML_STATIC
#include <SFML/Graphics.hpp>
#include <SFML/System.hpp>
#include <SFML/Window.hpp>
#pragma comment(lib, "sfml-graphics-s-d.lib")
#pragma comment(lib, "sfml-window-s-d.lib")
#pragma comment(lib, "sfml-system-s-d.lib")

#include <string>
#include <vector>
using namespace std;

void drawFps(sf::RenderWindow &wnd, sf::Clock &clock, sf::Font &font){
        float currentTime = clock.restart().asSeconds();
    float fps = 1.f / currentTime;
        sf::Text tx;
        tx.setString(to_string((int)fps).c_str());
        tx.setPosition(600.0f,500.0f);
        tx.setFont(font);
        tx.setCharacterSize(16);
        wnd.draw(tx);
}

class Messages{
public:
        static sf::Vector2i position;
        static vector<string> messages;
        static void AddDummyMessage(){
                messages.push_back("This is a test message, because test.");
        }
};

sf::Vector2i position = sf::Vector2i(0,0);
vector<string> Messages::messages;

void DisplayMessages(sf::RenderWindow &wnd, sf::Font &font){
        sf::Text tx;
        tx.setFont(font);
        tx.setCharacterSize(16);               
        int offset = 0;
        for(auto e : Messages::messages){
                tx.setPosition(position.x * 16, position.y * 16 + offset++*16);
                tx.setString(e);
                wnd.draw(tx);
        }
}

int main()
{
        sf::RenderWindow wnd(sf::VideoMode(800,600,32), "Test");
        sf::Event evt;
        sf::Font font;
        font.loadFromFile("arial.ttf");
        sf::Clock clock;

        while(wnd.isOpen()){
                wnd.clear();
                while(wnd.pollEvent(evt)){
                        if(evt.type == sf::Event::KeyPressed && evt.key.code == sf::Keyboard::Space){
                                Messages::AddDummyMessage();
                        }
                }
                DisplayMessages(wnd, font);
                drawFps(wnd, clock, font);
                wnd.display();
        }  
}