Taskmaster
Account closed
Registered: May 2012
Posts: 12 |
Clearing bitmap screen quickly
I've begun tinkering with drawing software sprites to the bitmap screen and I'm already running into serious problem. Good ol' 64. Nice and challenging, just how I remember it.
At any rate, my thought was to take my PC mentality into the rendering here and clear the screen each frame and redraw all the graphics from scratch. This is proving a challenge because ... well, clearing the bitmap memory takes the entire screen refresh and THEN some. Makes for kind of a boring game.
Anyhoo, I tried several methods of loop unrolling and self modifying code but it's just too much. Always too slow.
So I started to think about maybe drawing back over the graphics I drew the last frame and turn those bits off before drawing the new frame. Essentially drawing the frame once so the player can see it, and then inverted to erase it when the time comes.
Is this the generally accepted method on the C=64? I'm running out of options here... |
