Topics

1

General / Fixed timestep CPU usage

« on: February 12, 2016, 11:34:16 pm »

Hello. I have implemented a fixed timestep. The problem with this is that my CPU usually goes to about 30-40% and I don't understand why. A solution would be to just use the setFramerateLimit method or vsync, but I don't understand why would I need a fixed timestep if I use one of those. If someone can shed some light here that would be much appreciated.

const sf::Time m_frameTime = sf::seconds(1.f/60.f);
sf::Clock clock;
sf::Time passedTime = sf::Time::Zero;

while (window.isOpen())
{
        sf::Time elapsedTime = clock.restart();
        passedTime += elapsedTime;

        while (passedTime > m_frameTime)
        {
                passedTime -= m_frameTime;

                sf::Event event;
                while (window.pollEvent(event))
                {
                        if (event.type == sf::Event::Closed)
                                window.close();
                }
                update(m_frameTime);
        }
               
        window.clear()
        window.display();

}

2

General / Memory management

« on: August 21, 2015, 05:36:08 pm »

This is not really a SFML-related post but I would really appreciate your help.

At the moment, I'm using a std::vector of std::unique_ptr.
I push state objects created with std::make_unique using std::move when I want to change state and then I erase the stack.

I'm testing things out using 2 states: one has some textures in it and the other one is empty.
What happens when I repeatedly switch between states is that memory usage increases per switch.

I also tried making the textures raw pointers. When I manually delete them before switching states there is no increase in memory. But if I try to make them shared pointers or unique pointers the memory will still increase.
I'm curious how should I handle these states and pointers.

I change states using this method:

void StateManager::changeState(std::unique_ptr<State> state)
{
    //If the vector isn't empty destroy the current states
    //Clear the vector
    if (states.empty() == false)
    {
        for (auto i = 0; i < states.size(); i++)
        {
            states[i]->destroy(*window);
        }
        states.clear();
    }

    //Move the new state inside the vector
    states.push_back(std::move(state));

    //Initiate the state
    if (states.empty() == false)
    {
        states[MAINSTATE]->init(*window); //MAINSTATE = 0
    }
}

3

Graphics / getLocalBounds and getGlobalBounds

« on: August 09, 2015, 03:55:42 pm »

So I'm trying to make a button but I can't resize and center the text because both getLocalBounds and getGlobalBounds are returning 0. Here is the code:

       
void Button::setString(sf::String string)
        {
                m_string = string;
                m_text.setString(m_string);
                std::cout << m_text.getGlobalBounds().width; //This returns  0
    }
 

m_text is a private sf::Text variable.
The text is drawn on the screen, the setChar size method works as well. The only thing that isn't right here is that getGlobalBounds().width/height and getLocalBounds().width/height always return 0.

4

General / TGUI question

« on: June 21, 2015, 12:22:07 pm »

I have a header file in which there are extern variables.
Should I declare :

extern tgui::Gui gui;
//and use it once in main:
gui.setWindow(window);
 

Or should i just declare it once in every class I have?

I'm asking because in SFGUI you shouldn't declare it globally.

5

Window / Transparent window

« on: May 22, 2015, 01:13:03 pm »

Is there any way i could make a transparent splashscreen?

Transparent window with a rendered image, like the one photoshop uses.

http://www.optimiced.com/wp-uploads/2010/07/photoshop-cs5-white-rabbit-splash-screen.jpg

6

System / [SOLVED] Event text unicode

« on: May 20, 2015, 10:37:20 pm »

So i have this code:

case sf::Event::TextEntered:
c = static_cast<char>(event.text.unicode);
break;
 

My question is, how do I make this ignore keys that are not letters?

edit: bad englando

For anyone interested this is the solution:

if (((event.text.unicode > 64) && (event.text.unicode < 91)) || ((event.text.unicode > 96) && (event.text.unicode < 123)))

7

Window / Window crashes

« on: May 19, 2015, 04:43:37 pm »

The program works just fine, the code is not the problem.
But I get this error when trying to close the window from the X button.

http://imgur.com/a/YNnhi

plz halp