Messages

1

Audio / Panning audio

« on: January 28, 2009, 08:30:59 pm »

Is there a way to pan audio other than spatialization?

When using spatialization, the audio doesn't pan smoothly. For example, I have a sound whose position I'm moving from the left of the listener to the right of the listener.

The sound pans like this: first the sound starts getting louder in the left channel, then when it goes over the listeners position it suddenly jumps to the right channel and starts fading.

When panning from left to right, it should first play only on the left channel and then the sound on the right channel should start getting louder, and when the sound is in the middle both channels are at the same volume.

Here is a picture illustrating what I mean:



I'm using Windows XP and SFML 1.4.

2

Graphics / Hard borders and sprite anti-aliasing

« on: January 22, 2009, 12:12:47 pm »

In the A picture above, you can see that the left side of the sprite has a hard border. For example Gosu has an option to disable and enable this hard border. Maybe a similar option could be added to SFML? Altough it is not very important, because the hard border can be evaded by adding a one pixel margin around the sprite.

In the picture B, I have 8 levels of anti-aliasing enabled, but only the left side of sprite is anti-aliased (the same part that has the hard borded in picture A). Is it somehow possible to get anti-alisiang inside the sprite? I would like to use the crisp look of SetSmooth(false), but have the aliasing toned down. Maybe some other texture filtering mode would work for me, if AA is out of the question?

3

General discussions / How could I implement a fixed-timestep game loop?

« on: January 16, 2009, 11:05:46 pm »

Thanks for that XNA link, they've really nailed how to do fixed-timestep gameloop with independent drawing rate.

Here is also a good article for tips:
http://gafferongames.wordpress.com/game-physics/fix-your-timestep/

I'm using the latter article as a guide for a fixed-timestep loop. It has changeable physics rate and it limits maximum number of drawn frames to the physics rate. I haven't tested it thoroughly, but it seems to work ok. It currently looks like this:

Code: [Select]

float dt = 1.f/40.f; // Modify this to change physics rate.
float accumulator = 0.f;
bool drawn = false;

while (App.IsOpened())
{
    accumulator += clock.GetElapsedTime();
    clock.Reset();

    while (accumulator >= dt)
    {
        // Physics and gameplay updates.

        accumulator -= dt;
        drawn = false;
    }

    if (drawn)
    {
        sf::Sleep(0.01);
    }
    else
    {
        // Draw everything.

        drawn = true;
    }
}