A.D.A. Amiga Demoscene Archive

  Welcome guest! Please register a new account or log in

  

  

  

log in with SceneID

  

Demos Amiga Demoscene Archive Forum / Coding / Memory copy algorithm comments please...

 

Author Message
NovaCoder
Member
#1 - Posted: 14 Jan 2010 00:22 - Edited
Reply Quote
Hi,

In this game-port that I'm working on there is some code that copies dirty rectangles to a chunky buffer and sometimes to update the entire screen (it's not my code BTW). Can anyone give me a faster assembly based version or any general speed-up comments (for plain C), it's for 030+ and AGA only 320x200 8 bit display.


static byte *backBuffer;
backBuffer = (byte*)AllocMem(64000, MEMF_FAST);



void updateBackBuffer(byte *src, int x, int y, int w, int h) {

byte *dst;


// Addresse du pixel en dst
dst = (byte*)backBuffer + y*320 + x;

do {
CopyMem(src, dst, w);
dst += 320;
src += 320;
} while (--h);
}
Azure
Member
#2 - Posted: 14 Jan 2010 23:58
Reply Quote
Just copy larger chunks of data at once?
NovaCoder
Member
#3 - Posted: 15 Jan 2010 04:10 - Edited
Reply Quote
Hiya,

Can you give me an example please?

Also, would an assembler version give me a good performance boost (I'm using a very old version of gcc that came with StormC V4).

Thanx

 

  Please register a new account or log in to comment

  

  

  

 

A.D.A. Amiga Demoscene Archive, Version 3.0