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Update README.md

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alpine9000
2016-03-13 19:47:56 +11:00
parent 69691d2984
commit f93b097849
1 changed files with 18 additions and 10 deletions
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017.dual_playfield/README.md
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@ -38,23 +38,23 @@ Poke the copper list with the bitplane pointer addresses:
```
;; poke playfield 1 bitplane pointers
lea pf1_bitplanepointers(pc),a0
lea pf1_bitplanes(pc),a1
bsr.s pokeBitplanePointers
lea pf1_bitplanepointers(pc),a0
lea pf1_bitplanes(pc),a1
bsr.s pokeBitplanePointers
;; poke playfield 2 bitplane pointers
lea pf2_bitplanepointers(pc),a0
lea pf2_bitplanes(pc),a1
bsr.s pokeBitplanePointers
lea pf2_bitplanepointers(pc),a0
lea pf2_bitplanes(pc),a1
bsr.s pokeBitplanePointers
```
Enable 2x the bitplanes, and optionally re-order the bitplanes:
```
;; enable 2x the bitplanes as 2x playfields
move.w #((SCREEN_BIT_DEPTH*2)<<12)|COLOR_ON|DBLPF,BPLCON0(a6)
move.w #((SCREEN_BIT_DEPTH*2)<<12)|COLOR_ON|DBLPF,BPLCON0(a6)
;; set playfield2 to have priority
move.w #PF2PRI, BPLCON2(a6)
move.w #PF2PRI, BPLCON2(a6)
```
try it
@ -70,11 +70,19 @@ playfield 2
-----------
![playfield 2](../assets/playfield2_8.png?raw=true)
dual playfields, playfield 2 in front
-------------------------------------
![dual playfields, playfield 2 in front](screenshots/screenshot.png?raw=true)
```
move.w #PF2PRI, BPLCON2(a6)
```
![dual playfields, playfield 2 in front](screenshots/screenshot.png?raw=true)
dual playfields, playfield 1 in front
-------------------------------------
```
move.w #0, BPLCON2(a6)
```
![dual playfields, playfield 1 in front](screenshots/screenshot2.png?raw=true)