SFML community forums
Help => Graphics => Topic started by: Uzaku on April 22, 2011, 08:44:30 pm
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Hi,
after hours of searching within my code I decided to make a minimal sample to find the Error. And I think I found a Bug.
When I run this code, and press the A-Key, my Window starts flickering between black and the choosen color.
And here is a DownloadLink to a zip archiv with all files: https://rapidshare.com/files/458689578/SFMLBug.zip
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <SFML/Graphics.hpp>
#include <list>
int WINAPI WinMain(HINSTANCE d1, HINSTANCE d2, LPSTR d3, int d4)
{
sf::RenderWindow *W = new sf::RenderWindow(sf::VideoMode(1024, 768, 32), "Test Window");
sf::Image I1, I2, I3, I4;
I1.LoadFromFile("Images\\CreateNetGame.png");
I2.LoadFromFile("Images\\Exit.png");
I3.LoadFromFile("Images\\JoinNetgame.png");
I4.LoadFromFile("Images\\Start.png");
sf::Sprite S1(I1, sf::Vector2f(0, 0)), S2(I2, sf::Vector2f(0, 200)), S3(I3, sf::Vector2f(0, 400)), S4(I4, sf::Vector2f(0, 600));
while (W->IsOpened())
{
// Process events
sf::Event Event;
while (W->GetEvent(Event))
{
// Close window : exit
if (Event.Type == sf::Event::Closed)
W->Close();
if(Event.Type == sf::Event::KeyPressed && Event.Key.Code == sf::Key::A)
W->Clear(sf::Color(255, 0, 255));
}
W->Draw(S1);
W->Draw(S2);
W->Draw(S3);
W->Draw(S4);
W->Display();
}
return 0;
}
greetings Uzaku
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That's because SFML uses double-buffering. So if you clear once instead of every frame, only one of the two internal buffers will have the chosen color, and the other will keep the default one (black, in your case). And everytime you call Display() the buffers are switched, that's why you see it flickering.
So you must call Clear() everytime.
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Oh, Im sorry for thinking it was a bug.
Ty for the quick support :)