From CPCWiki - THE Amstrad CPC encyclopedia!
|
|
| Line 1: |
Line 1: |
| − | If you have enough memory, the fastest way to plot sprites is to use the "direct addressing" methode:
| |
| − | Here is a small example:
| |
| | | | |
| − | <pre>
| |
| − | LD HL,screen address
| |
| − | LD BC,#800+[most used byte]
| |
| − | LD DE,#C050
| |
| − | LD (HL),byte1:INC HL ;plot line 1
| |
| − | LD (HL),byte2:INC HL
| |
| − | LD (HL),C
| |
| − | LD A,H:ADD B:LD H,A
| |
| − | JR NC,line2
| |
| − | ADD HL,DE
| |
| − | .line2
| |
| − | LD (HL),byte6:DEC HL ;plot line 2
| |
| − | LD (HL),C :DEC HL
| |
| − | LD (HL),byte4
| |
| − | LD A,H:ADD B:LD H,A
| |
| − | JR NC,line3
| |
| − | ADD HL,DE
| |
| − | .line3
| |
| − | LD A,(HL):AND #55:OR byte7:LD (HL),A:INC HL ;plot line 3 (contains transparent areas)
| |
| − | LD (HL),byte8:INC HL
| |
| − | LD A,(HL):AND #AA:OR byte9:LD (HL),A
| |
| − | RET
| |
| − | </pre>
| |
| − |
| |
| − | In mode 0 you will need two routines for every sprite, but I think there is no faster way to plot sprites on the CPC.
| |
Revision as of 09:26, 5 May 2007
