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frame sync

Started by sprinter_trueno Apr 25, 2003 at 5:56 AM 0 replies 550+ views

Original Post

Apr 25, 2003 at 5:56 AM

Hi ppl, I got a question that is bothering me for some time now. Here it goes: How is it done that if I wanna use a fixed frame rate while the refresh rate of the video card is not. For example, my app shows 50 frames a second but my refresh rate is set to 60Hz. As far as I know it is a good method to wait for the vertical blank but then my app would of course always run at a different speed. The only idea I can think of is that I skip some blanks for redraw to maintain the speed, so that in the end I draw 50 frames while I have 60 redraws which means that every 6th redraw just shows the 5th. Is this correct or is there another method ? Thanks for any comment. Lorenz

RhoneRanger

Apr 25, 2003 at 6:10 AM

YOu could set your timer to render at 50 fps. Just an idea of how you could accomplish this. Maybe someone has something better?


int fps=50; //change this to whatever you want your fps to be
    //if you want your game to run at 40 fps etc.

float RenderTimer=1/fps; 

float TimeToRender=0.00f;
Just use your Elapsed time in this manner in the game loop



TimeToRender+=Elapsed;

Do non graphic stuff;

if(TimeToRender>=RenderTimer)
{
renderScene;
TimeToRender=0.00f;
}

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