How to keep the CPU usage down while running an SDL program?
- by budwiser
I've done a very basic window with SDL and want to keep it running until I press the X on window.
#include "SDL.h"
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
int main(int argc, char **argv)
{
SDL_Init( SDL_INIT_VIDEO );
SDL_Surface* screen = SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, 0,
SDL_HWSURFACE | SDL_DOUBLEBUF );
SDL_WM_SetCaption( "SDL Test", 0 );
SDL_Event event;
bool quit = false;
while (quit != false)
{
if (SDL_PollEvent(&event)) {
if (event.type == SDL_QUIT) {
quit = true;
}
}
SDL_Delay(80);
}
SDL_Quit();
return 0;
}
I tried adding SDL_Delay() at the end of the while-clause and it worked quite well.
However, 80 ms seemed to be the highest value I could use to keep the program running smoothly and even then the CPU usage is about 15-20%.
Is this the best way to do this and do I have to just live with the fact that it eats this much CPU already on this point?
