Controlling Game Loop

Nick

Sage

Posts: 1,066
Joined: 2004.07

Post: #1

Jul 21, 2007 — 04:45 PM

So I'm back

. And I'm trying to create a game loop in SDL. I'm trying to used a fixed step to control my loop along with vsync, but it doesn't seem to be working. Anyone have any ideas for me? Thanks.

Code:

void Game::gameLoop()

{

    SDL_Event event;

    int lastUpdateTickCount = SDL_GetTicks();

    int lastTickCount = SDL_GetTicks();

    int tickCount = SDL_GetTicks();

    while (!quit)

    {

        while (tickCount <= lastTickCount + (1000 / parameters.desiredFPS))

        {

            while (SDL_PollEvent(&event))

            {

                switch (event.type)

                {

                    case SDL_QUIT:

                        quit = true;

                    case SDL_KEYDOWN:

                    case SDL_KEYUP:

                        handleKeyboard(event.key);

                        break;

                    case SDL_MOUSEMOTION:

                        handleMouseMotion(event.motion);

                        break;

                    case SDL_MOUSEBUTTONDOWN:

                    case SDL_MOUSEBUTTONUP:

                        handleMouseButton(event.button);

                        break;

                    case SDL_USEREVENT:

                        HandleUserEvent(event.user);

                        break;

                }

            }

            int elapsedTicks = tickCount - lastUpdateTickCount;

            float elapsedTime = (float)elapsedTicks / 1000.0f;

            Update(elapsedTime);

            lastUpdateTickCount = tickCount;

            tickCount = SDL_GetTicks();

        }

        beginDraw();

        Draw();

        endDraw();

        lastTickCount = tickCount;

    }

}

OneSadCookie

Luminary

Posts: 5,125
Joined: 2002.04

Post: #2

Jul 21, 2007 — 06:13 PM

http://sacredsoftware.net/tutorials/Anim...tion.xhtml

Nick

Sage

Posts: 1,066
Joined: 2004.07

Post: #3

Jul 21, 2007 — 07:12 PM

Thanks. That seemed to do just the trick.

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