Fast 2d rendering - CopyBits
Post: #1
My game is a 2d top down game that uses Copybits to do it's drawing. I'm having a problem making it run real fast, I know that the code is slow, I just don't know how to make it any better 
I have an event loop timer that fires every millisecond(too much, every 1/10 of a second?) that does the animation and drawing and such. The animation and drawing handler is pretty slow, basically because I have a constantly scrolling map that keeps the player centered until the map can't move any further, and redraw the map to the screen from the offscreen buffer each time. I don't know if it would make sense to check to see how much of the map needs to be redrawn to the screen, since it's moving all of the time.
While I'm testing it, I have all the animations and the players and such movign at the same time, which would never really happen, but it might, so might as well test it this way.
The function:
Any help speeding this up would be appreciated
I have an event loop timer that fires every millisecond(too much, every 1/10 of a second?) that does the animation and drawing and such. The animation and drawing handler is pretty slow, basically because I have a constantly scrolling map that keeps the player centered until the map can't move any further, and redraw the map to the screen from the offscreen buffer each time. I don't know if it would make sense to check to see how much of the map needs to be redrawn to the screen, since it's moving all of the time.
While I'm testing it, I have all the animations and the players and such movign at the same time, which would never really happen, but it might, so might as well test it this way.
The function:
Code:
static pascal void AnimateAndRender (EventLoopTimerRef theTimer, void* userData)
{
MightyMan* blah = (MightyMan*) userData;
MonsterGenerator* mGen = blah->theLevel.monsterGenerators;
SpritePtr sprite;
Rect dirty;
/*Animation*/
//Monster generators
while(mGen != NULL)
{
sprite = mGen->GetSprite();
sprite->GetRect(&dirty);
blah->DirtyRectangle(&dirty);
mGen->UpdateGenerator(mGen);
mGen = mGen->next;
}
mGen = blah->theLevel.monsterGenerators; //reset to draw
//Player
sprite = blah->thePlayer.GetSprite();
sprite->GetRect(&dirty);
blah->DirtyRectangle(&dirty);
sprite->Animate();
// Monsters - needs to be done.
/*Dirty Rect fix*/
blah->theLevel.FixDirty();
/*Drawing*/
while(mGen!=NULL)
{
sprite = mGen->GetSprite();
sprite->Draw(blah->theLevel.mapStorage);
mGen = mGen->next;
}
sprite = blah->thePlayer.GetSprite();
sprite->Draw(blah->theLevel.mapStorage);
/*Copy buffer*/
blah->DrawMap();
}Any help speeding this up would be appreciated
Post: #2
First, the quick answer: don't bother implementing your own double-buffering, Quartz is already doing that for you and you may be doing an unnecessary extra copybits. (I don't know if this really applies to you, since I don't know what blah->DrawMap(); does.)
Secondly, the long answer: You'll get far better performance by using OpenGL, but it's very different from Mac OS-native graphics so it would be a good bit of work to switch :/
Secondly, the long answer: You'll get far better performance by using OpenGL, but it's very different from Mac OS-native graphics so it would be a good bit of work to switch :/
Post: #3
Well, DrawMap puts the offscreen map into the backbuffer of the window, then flushes it.
I was considering OpenGL but figured I'd save that for another project, although I've used it before I want to do one game like this
I was considering OpenGL but figured I'd save that for another project, although I've used it before I want to do one game like this
Post: #5
Well, now that I think about it... is there a toolbox function to draw directly to the screen, or am I going to have write it myself?
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