Talk:Programming:Fast Sprites - Revision history

Prodatron: Reverted edits by Prodatron (Talk); changed back to last version by Gryzor

2007-05-07T09:59:10Z

Reverted edits by Prodatron (Talk); changed back to last version by Gryzor

Prodatron: Reverted edits by Gryzor (Talk); changed back to last version by Prodatron

2007-05-07T09:57:42Z

Reverted edits by Gryzor (Talk); changed back to last version by Prodatron

Gryzor: Removing all content from page

2007-05-05T14:26:46Z

Removing all content from page

Prodatron at 17:41, 4 August 2006

2006-08-04T17:41:58Z

New page

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.

← Older revision		Revision as of 09:59, 7 May 2007
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.~~

← Older revision		Revision as of 14:26, 5 May 2007
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.~~

← Older revision	Revision as of 09:57, 7 May 2007
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.