Hi!
A little while ago i started using SDL for my OpenGL based CRPG. So far i
have’nt done much but i already got into some truble…
THe problem i have is that when i use SDL_PollEvent in my game loop my
mousecursor moves slowly and with a delay (compared to the SDL pointer).
First i thought it might take time to draw the cursor but i changed it to be
a single point so that cant be the problem.
the game loop looks like this:
while(!quit){
if((SDL_PollEvent(&event)) != 0){
switch(event.type){
case SDL_KEYDOWN:
if(event.key.keysym.sym == SDLK_ESCAPE)
quit = true;
break;
case SDL_MOUSEMOTION:
setcursorxy(somex,somey) //whatever
break;
default:
break;
}
}
//clear opengl stuff
//draw the cursor
//swapbuffers
} //end game loop
any body has any idea what might be the problem??
ANother problem i have is that when i set
SDL_ShowCurasor(0) the mouse jumps tp the lower right corner of the screen
and stays there…no matter what i do…what can i be?
anyway…thanx in advance
–Anders Folkesson
I think I know the prob here, but I’m new to SDL. 
During each iteration of your main loop there, you are only processing one
event. Your loop might run a few times before it gets to the mouse event.
Replace the if statement with something like this:
while (SDL_PollEvent (&event))
This will process all events every iteration, instead of just 1.
Anders Folkesson wrote:> Hi!
A little while ago i started using SDL for my OpenGL based CRPG. So far i
have’nt done much but i already got into some truble…
THe problem i have is that when i use SDL_PollEvent in my game loop my
mousecursor moves slowly and with a delay (compared to the SDL pointer).
First i thought it might take time to draw the cursor but i changed it to
be a single point so that cant be the problem.
the game loop looks like this:
while(!quit){
if((SDL_PollEvent(&event)) != 0){
switch(event.type){
case SDL_KEYDOWN:
if(event.key.keysym.sym == SDLK_ESCAPE)
quit = true;
break;
case SDL_MOUSEMOTION:
setcursorxy(somex,somey) //whatever
break;
default:
break;
}
}
//clear opengl stuff
//draw the cursor
//swapbuffers
} //end game loop
any body has any idea what might be the problem??
ANother problem i have is that when i set
SDL_ShowCurasor(0) the mouse jumps tp the lower right corner of the screen
and stays there…no matter what i do…what can i be?
anyway…thanx in advance
–Anders Folkesson
I have already tried that ine…without success unfortunately.
The problem with doing it that way as i see it is:
-
if i use while instead of if in my game loop i will miss some screen
updates…which leads to “jumps” with the mouse cursor
-
i put a “cout” in the default section of the switch statement to see if i
got any unhandeled events, but i dont.
can this have anything to do with the fact that i write the mouse cursor to
the backbuffert?? I am using OpenGL, so if anyone knows how to force writing
to the screenbuffer directly with dept_test turned on, please let me know
how…
anyway…thanks a bunch Mik 
–Anders> I think I know the prob here, but I’m new to SDL.
During each iteration of your main loop there, you are only processing one
event. Your loop might run a few times before it gets to the mouse event.
Replace the if statement with something like this:
while (SDL_PollEvent (&event))
This will process all events every iteration, instead of just 1.
Anders Folkesson wrote:
Hi!
A little while ago i started using SDL for my OpenGL based CRPG. So far i
have’nt done much but i already got into some truble…
THe problem i have is that when i use SDL_PollEvent in my game loop my
mousecursor moves slowly and with a delay (compared to the SDL pointer).
First i thought it might take time to draw the cursor but i changed it to
be a single point so that cant be the problem.
the game loop looks like this:
while(!quit){
if((SDL_PollEvent(&event)) != 0){
switch(event.type){
case SDL_KEYDOWN:
if(event.key.keysym.sym == SDLK_ESCAPE)
quit = true;
break;
case SDL_MOUSEMOTION:
setcursorxy(somex,somey) //whatever
break;
default:
break;
}
}
//clear opengl stuff
//draw the cursor
//swapbuffers
} //end game loop
any body has any idea what might be the problem??
ANother problem i have is that when i set
SDL_ShowCurasor(0) the mouse jumps tp the lower right corner of the
screen and stays there…no matter what i do…what can i be?
anyway…thanx in advance
–Anders Folkesson