Hello,
The search feature of this forum is currently broken on my end so I don't know if anybody already posted this request.
However, I found those issues:
When using SFML for an OpenGL program (so, without using sf::RenderWindow) the only way to switch to fullscreen mode is to recreate the window.
This may not be a problem when using sf::RenderWindow because this class probably saves the OpenGL state and is able to restore it when the window is recreated.
However, when using sf::Window, users will have to save the paramters sent to sf::Window::create() + the current OpenGL state (calls to glEnable/glDisable/glClearColor and probably other things).
This is a real problem because it causes obscure bugs, and imo it shouldn't be up to the users to deal with that.
What is your opinion on that matter?
EDIT: Minimal example for glClearColor:
#include <SFML/OpenGL.hpp>
#include <SFML/Window.hpp>
int main(int, char **) {
sf::ContextSettings settings;
settings.depthBits = 24;
settings.stencilBits = 8;
settings.antialiasingLevel = 0;
settings.majorVersion = 2;
settings.minorVersion = 1;
sf::Window window;
window.create(sf::VideoMode(800, 600), "OpenGL", sf::Style::Close, settings);
auto desktop = sf::VideoMode::getDesktopMode();
window.setPosition(sf::Vector2i(
desktop.width / 2 - window.getSize().x / 2,
desktop.height / 2 - window.getSize().y / 2
));
glClearColor(0.0f, 1.0f, 1.0f, 1.0f);
bool running = true;
bool fullscreen = false;
while (running) {
sf::Event event;
while (window.pollEvent(event)) {
if (event.type == sf::Event::Closed || (event.type == sf::Event::KeyPressed && event.key.code == sf::Keyboard::Escape)) {
running = false;
}
else if (event.type == sf::Event::KeyPressed && event.key.code == sf::Keyboard::A) {
window.create(sf::VideoMode(800, 600), "OpenGL", sf::Style::Close, settings);
}
else if (event.type == sf::Event::KeyPressed && event.key.code == sf::Keyboard::Z) {
window.create(sf::VideoMode(800, 600), "OpenGL", sf::Style::Close, settings);
auto desktop = sf::VideoMode::getDesktopMode();
window.setPosition(sf::Vector2i(
desktop.width / 2 - window.getSize().x / 2,
desktop.height / 2 - window.getSize().y / 2
));
glClearColor(0.0f, 1.0f, 1.0f, 1.0f);
}
}
glClear(GL_COLOR_BUFFER_BIT);
window.display();
}
window.close();
return 0;
}
When you press 'A', the window is recreated but nothing is setup, so it resets to its original position and the clear color goes back to black.
When you press 'Z', the window is recreated but both the position and the clear color are setup again so it's fine.
However, I don't think the user should have to store and re-setup all those things (position, video mode, caption, style, context settings, glEnable/Disable/ClearColor, etc...).
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