Topics

1

General / Spike lag

« on: August 06, 2016, 07:28:08 am »

I keep having this spike lag on my pong game

here is the code

while (window.isOpen())
        {
                window.setFramerateLimit(60);
                sf::Event event;
                dt = deltatime.getElapsedTime().asSeconds();
               
                update(event,dt);
                while (window.pollEvent(event))
                {
                        if (event.type == sf::Event::Closed || sf::Keyboard::isKeyPressed(sf::Keyboard::Escape))
                                window.close();
                }
                if (mClock.getElapsedTime().asSeconds() >= 1.f)
                {
                        mFps = mFrame;
                        mFrame = 0;
                        mClock.restart();
                       
                }

                ++mFrame;
                //std::cout << mFps << std::endl;

                this->deltatime.restart();
                window.clear(color);
                player->Render(window);
                ball->Render(window);
                window.display();
       

        }

IM guessing its the deltatime. But I dont see the connection. My computer is a medium gaming rig so I shouldnt have this lag spike.

2

General / Questions about SF::Clock

« on: July 11, 2016, 03:58:24 pm »

So I bought the SFML GameDev by example.

I was just curious if why is the clock keeps getting called without being called in the game loop

        sf::Clock clock;
        while (window.isOpen())
        {
                sf::Event event;
                while (window.pollEvent(event))
                {
                        if (event.type == sf::Event::Closed)
                                window.close();
                }

                window.clear();
                window.draw(shape);
                window.display();
               
                sf::Time a = clock.restart();
                std::cout << a.asSeconds() << std::endl;

        }

The restart function puts the time counter back to zero so it should be the the output I will get is 0 up until the end. Does that mean the the clock has its own game loop under the hood?

3

General / How do you get the 60 value fps

« on: July 07, 2016, 02:43:27 pm »

Ive been searching how to get the framerate to display as 60fps in the windows screen

this code

 float Framerate = 1.f / Clock.GetElapsedTime();
    Clock.Reset();

is not suited for that kind of thing.
I saw on some previos post here made by laurent
He said

There are two ways to compute the FPS:
1. counting how many frames you have in one second (that's your code)
2. counting how many seconds you have in one frame, and inverting the result (that's my code)

Basically I just wanna count how many frames is called in one second?

4

General / Having some issues with SFML

« on: January 26, 2016, 11:55:07 am »

I was following this http://www.gamefromscratch.com/post/2015/06/02/Creating-an-SFML-project-on-Mac-OS-using-CLion-and-CMake.aspx tutorial on setting up SFML with Clion.  I have the correct working directory but I got an error  saying

Error:Could NOT find SFML (missing: SFML_GRAPHICS_LIBRARY SFML_WINDOW_LIBRARY SFML_SYSTEM_LIBRARY)

This is my cmake

cmake_minimum_required(VERSION 3.2)
project(SFMLTest)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")

set(SOURCE_FILES main.cpp)
add_executable(SFMLTest ${SOURCE_FILES})

set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "/SFML-2.3.2/cmake/Modules/")
find_package(SFML REQUIRED graphics window system)
if (SFML_FOUND)
    include_directories(${SFML_INCLUDE_DIR})
    target_link_libraries(SFMLTest ${SFML_LIBRARIES})
endif(SFML_FOUND)

Please help..

5

General / Additional question about the official code on the book

« on: October 28, 2014, 02:32:27 pm »

Since this is not included on the book..
Just wanna know whats the purpose of this and what does it do

const sf::Time Game::TimePerFrame = sf::seconds(1.f/60.f);

Its on the very top of game.cpp before the declaration of constructor

6

General / Some errors on official SFML book code in github

« on: October 22, 2014, 07:03:44 pm »

Have not read the book yet. I just want to try if every code is working before reading the book.

Turns out i got 2 unresolved externals.

Here are they

Error   2       error LNK2019: unresolved external symbol "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __cdecl toString<__int64>(__int64 const &)" (??$toString@_J@@YA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@AB_J@Z) referenced in function "private: void __thiscall Game::updateStatistics(class sf::Time)"

Error   1       error LNK2019: unresolved external symbol "class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > __cdecl toString<unsigned int>(unsigned int const &)" (??$toString@I@@YA?AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@ABI@Z) referenced in function "private: void __thiscall Game::updateStatistics(class sf::Time)"      

7

General / Help VS 2013 cannot open file

« on: October 20, 2014, 07:16:38 pm »

Hi. I followed the instructions here clearly but i still get an error

Error   1       error LNK1104: cannot open file 'sfml-graphics-d.lib'

Is this compatible on VS 2013?