[SDL] Delta time?

[L-28C]

Yep, I can't seem to figure out a way to "tweak" the slowdown... :/

Justin Coleman wrote:
> Multiply your framerate (60/sec?) by each of those numbers to get the
> total change per second, then multiply the per-second value by however
> much (fractional seconds) time between frames. The 1% deceleration may
> need to be tweaked, since it's dependent on the current speed and not
> a fixed value.
> 
> On 10/12/07, L-28C <kixdemp at gmail.com> wrote:
>> Hello people of SDL!
>>
>> I've been capping the framerate in my games the last few times, but I
>> want to give delta time a try... Here's the code I have modified to work
>> with DT:
>>
>> -----------------------
>>         oldTime = SDL_GetTicks();
>>
>>         while (1)
>>         {
>>                 newTime = SDL_GetTicks();
>>                 delta = newTime - oldTime;
>>
>>                 /* Update control status */
>>                 handleControls(controls);
>>
>>                 /* TODO: Pause, not exit */
>>                 if (controls[K_PAUSE]) exit(0);
>>
>>                 /* Process game logic */
>>                 doLogic(delta);
>>
>>                 /* Render our scene */
>>                 renderBackground();
>>                 render(0);
>>
>>                 /* So we don't use 100% CPU */
>>                 SDL_Delay(1);
>>
>>                 oldTime = newTime;
>>         }
>> -----------------------
>>
>> In doLogic(), what I had done while capping FPS was add 0.05f to the
>> ball's speed (acceleration) and multiply by 0.99f (deceleration).
>>
>> But how would I modify those values to work with my delta?
>>
>> Thanks!
>>
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