LÖVE

Luke100000 wrote:How important is vsync? Can I disable it for all my games?

function love.load()
    love.window.setMode(640, 480, { vsync = true });
end

local x = 0;
function love.update(dt)
    x = x + 1;
end

function love.draw()
    love.graphics.circle('fill', x, 20, 5, 20);

    love.graphics.print(string.format("FT: %.3f ms", 1000 * love.timer.getAverageDelta()), 10, love.window.getHeight() - 60);
    love.graphics.print(string.format("FPS: %.3f fps", love.timer.getFPS()), 10, love.window.getHeight() - 40);
end

function love.load()
    love.window.setMode(640, 480, { vsync = true });
end

local x = 0;
local speed = 10;
function love.update(dt)
    x = x + speed * dt;
end

function love.draw()
    love.graphics.circle('fill', x, 20, 5, 20);

    love.graphics.print(string.format("FT: %.3f ms", 1000 * love.timer.getAverageDelta()), 10, love.window.getHeight() - 60);
    love.graphics.print(string.format("FPS: %.3f fps", love.timer.getFPS()), 10, love.window.getHeight() - 40);
end

function love.load()
    love.window.setMode(640, 480, { vsync = true });
end

local x = 0;
local speed = 10;
function love.update(dt)
    x = x + speed * dt;

    -- Lower framerate manually
    local foo = "";
    for i = 1, 10000000 do
        foo = foo .. "";
    end
end

function love.draw()
    love.graphics.circle('fill', x, 20, 5, 20);

    love.graphics.print(string.format("FT: %.3f ms", 1000 * love.timer.getAverageDelta()), 10, love.window.getHeight() - 60);
    love.graphics.print(string.format("FPS: %.3f fps", love.timer.getFPS()), 10, love.window.getHeight() - 40);
end

bizziboi wrote:If I'm not mistaking there's another side effect to turning off vsync, screen tearing. IMO you're better off keeping vsync enabled and still using dt to get constant motion - that way the lag spikes won't show up as hiccups in perceived movement.

T-Bone wrote:Even with vsync activated, you cannot assume that the game will run at a constant frame rate, because the computer may have poor graphics drivers or may not even support vsync at all, or might be too slow to reach a steady frame rate. In other words, you need to use dt properly no matter what.

And yes, you can just disable vsync if it causes problems for you. For bigger games, I would suggest including an in-game option for enabling/disabling vsync, as different computers behave differently.

BOT-Brad wrote:

T-Bone wrote:Even with vsync activated, you cannot assume that the game will run at a constant frame rate, because the computer may have poor graphics drivers or may not even support vsync at all, or might be too slow to reach a steady frame rate. In other words, you need to use dt properly no matter what.

And yes, you can just disable vsync if it causes problems for you. For bigger games, I would suggest including an in-game option for enabling/disabling vsync, as different computers behave differently.

Just to add to this, is there anyway to enabled/disable vsync during run-time? Or do I need the user to restart the application/game and change it in conf.lua?

S0lll0s wrote:

BOT-Brad wrote:

T-Bone wrote:Even with vsync activated, you cannot assume that the game will run at a constant frame rate, because the computer may have poor graphics drivers or may not even support vsync at all, or might be too slow to reach a steady frame rate. In other words, you need to use dt properly no matter what.

And yes, you can just disable vsync if it causes problems for you. For bigger games, I would suggest including an in-game option for enabling/disabling vsync, as different computers behave differently.

Just to add to this, is there anyway to enabled/disable vsync during run-time? Or do I need the user to restart the application/game and change it in conf.lua?

https://love2d.org/wiki/love.window.setMode

there is a "vsync" attribute in the flags option.