Hi,
Going directly to the point, I wanted to try a rendering thread to decrease my the FPS count.
It ended up giving me strange results and unstable behavior. Sometimes I get:
XIO: fatal IO error 11 (Resource temporarily unavailable) on X server ":0"
after 104 requests (104 known processed) with 0 events remaining.
Sometimes, it almost work but I cannot change the window. If I do, I can not get back again.
By the error you should already know I am running Linux. I am using the 2.0 SFML version from the Gentoo ebuild.
My makefile is:
g++ -o o main.cpp -lsfml-graphics -lsfml-window -lsfml-system -std=c++0x -pthread
Below is my simple code:
#include<SFML/Graphics.hpp>
#include<SFML/System.hpp>
#include<iostream>
#include <thread>
using namespace std;
#define DIR_MEDIA_TEXTURES "media/textures/"
sf::Sprite sprite;
//return if the number of frames should be reset
bool frameTiming(float number_of_frames, float accum_elapsed_seconds)
{
if(accum_elapsed_seconds > 5.0)
{
cout << "FPS: " << number_of_frames/accum_elapsed_seconds << endl;
return true;
}
return false;
}
void renderingThread(sf::Window* window)
{
// activate the window's context
window->setActive(true);
sf::RenderWindow* render_window= (sf::RenderWindow*) window;
// the rendering loop
while (window->isOpen())
{
// draw...
render_window->clear();
//window.draw(shape);
render_window->draw(sprite);
//render_window->draw(sprite);
// end the current frame -- this is a rendering function (it requires the context to be active)
window->display();
}
}
int main()
{
sf::RenderWindow window(sf::VideoMode(1024, 800), "Triturus Project", sf::Style::Default);
//sf::RenderWindow window(sf::VideoMode::getDesktopMode(), "Triturus Project", sf::Style::Fullscreen);
window.setVerticalSyncEnabled(true);
sf::CircleShape shape(100.f);
shape.setFillColor(sf::Color::Green);
sf::Texture texture;
if (!texture.loadFromFile(DIR_MEDIA_TEXTURES"grass94.tga"))
//if (!texture.loadFromFile("test.png"))
//if (!texture.loadFromFile(DIR_MEDIA_TEXTURES"plant142.tga"))
//if (!texture.loadFromFile(DIR_MEDIA_TEXTURES"stone240.tga"))
{
// error...
cout << "Error: Failed loading texture" << endl;
}
texture.setRepeated(true);
//texture.setSmooth(true);
sprite.setTexture(texture);
sprite.setScale(1,1);
sf::IntRect rect(0,0,1000,1000);
sprite.setTextureRect(rect);
// deactivate its OpenGL context
window.setActive(false);
// launch the rendering thread
sf::Thread thread(&renderingThread, &window);
//std::thread render_thread( renderingThread, &window);
//render_thread.join();
thread.launch();
sf::Clock clock;
sf::Time accum_time;
float number_of_frames;
while (window.isOpen())
{
//------------- Event Handling -------------
sf::Event event;
while (window.pollEvent(event))
{
if (event.type == sf::Event::Closed)
window.close();
}
//------------- Time -------------
//get the time elapsed
sf::Time elapsed = clock.restart();
//updateGame(elapsed);
//cout << elapsed.asSeconds() << endl;
//frame counter
accum_time+= elapsed;
number_of_frames++;
bool reset_frame_counter= frameTiming(number_of_frames, accum_time.asSeconds());
if(reset_frame_counter==true)
{
number_of_frames=0.0f;
accum_time= sf::seconds(0.0f);
}
}
return 0;
}
