From d895290a8a3c602f92c7f57ebb929e141b045e34 Mon Sep 17 00:00:00 2001
From: alpine9000 <alex.g.brown@gmail.com>
Date: Sun, 13 Mar 2016 19:39:42 +1100
Subject: [PATCH] Updates for dual playfield example

---
 017.dual_playfield/Makefile                   |   4 +-
 017.dual_playfield/README.md                  |  56 +++++++++++++++++-
 017.dual_playfield/constants.i                |   2 +-
 017.dual_playfield/dual_playfield_mode.s      |  29 +++++----
 017.dual_playfield/init.s                     |   8 ++-
 017.dual_playfield/screenshots/screenshot.png | Bin 0 -> 5966 bytes
 .../screenshots/screenshot2.png               | Bin 0 -> 5796 bytes
 assets/playfield1_8.png                       | Bin 0 -> 4684 bytes
 assets/playfield2_8.png                       | Bin 0 -> 4574 bytes
 include/bplconbits.i                          |   3 +-
 10 files changed, 84 insertions(+), 18 deletions(-)
 create mode 100644 017.dual_playfield/screenshots/screenshot.png
 create mode 100644 017.dual_playfield/screenshots/screenshot2.png
 create mode 100644 assets/playfield1_8.png
 create mode 100644 assets/playfield2_8.png

diff --git a/017.dual_playfield/Makefile b/017.dual_playfield/Makefile
index e488a6e..1d8bd0d 100644
--- a/017.dual_playfield/Makefile
+++ b/017.dual_playfield/Makefile
@@ -1,8 +1,8 @@
 MODULE=dual_playfield_mode.s
 FLOPPY=bin/dual_playfield_mode.adf
 IMAGEDATA=out/playfield1-palette.s out/playfield2-palette.s out/playfield1.bin out/playfield2.bin
-PF1_FILE=../assets/playfield1.png
-PF2_FILE=../assets/playfield2.png
+PF1_FILE=../assets/playfield1_8.png
+PF2_FILE=../assets/playfield2_8.png
 
 EXTRA=$(IMAGEDATA) init.s utils.s constants.i Makefile
 BASE_ADDRESS=10000
diff --git a/017.dual_playfield/README.md b/017.dual_playfield/README.md
index ccd1f43..1728c25 100644
--- a/017.dual_playfield/README.md
+++ b/017.dual_playfield/README.md
@@ -1,7 +1,61 @@
 dual playfield
 ==============
 
-Work in progress
+We now try and set up a dual playfield screen with 3 bitplanes per playfield. This gives us 7 colors + transparent for each playfield.
+
+Set the number of bitplanes per playfield in [constants.i](constants.i]
+
+  ```
+  SCREEN_BIT_DEPTH	equ 3   ; 3 bitplanes per playfield
+```
+
+New copper list that assigns bitplanes to each playfield after poking in [dual_playfield_mode.s](dual_playfield_mod.s]
+
+  ```
+copper:
+pf1_bitplanepointers:
+	;; this is where bitplanes are assigned to playfields
+	;; http://amigadev.elowar.com/read/ADCD_2.1/Hardware_Manual_guide/node0079.html
+	;; for 3 bitplanes per playfield, playfield1 gets bitplanes 1,3,5
+	dc.w	BPL1PTL,0
+	dc.w	BPL1PTH,0
+	dc.w	BPL3PTL,0
+	dc.w	BPL3PTH,0
+	dc.w	BPL5PTL,0
+	dc.w	BPL5PTH,0
+pf2_bitplanepointers:
+	;; for 3 bitplanes per playfieldd, playfield2 gets bitplanes 2,4,6
+	dc.w	BPL2PTL,0
+	dc.w	BPL2PTH,0
+	dc.w	BPL4PTL,0
+	dc.w	BPL4PTH,0
+	dc.w	BPL6PTL,0
+	dc.w	BPL6PTH,0
+	dc.l	$fffffffe
+```
+
+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
+
+	;; poke playfield 2 bitplane pointers
+	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)
+	;; set playfield2 to have priority
+	move.w	#PF2PRI, BPLCON2(a6)
+```
 
 try it
 ------
diff --git a/017.dual_playfield/constants.i b/017.dual_playfield/constants.i
index 2f85b31..0929ed5 100644
--- a/017.dual_playfield/constants.i
+++ b/017.dual_playfield/constants.i
@@ -3,7 +3,7 @@ LVL3_INT_VECTOR		equ $6c
 SCREEN_WIDTH		equ 320
 SCREEN_HEIGHT		equ 256
 SCREEN_WIDTH_BYTES	equ (SCREEN_WIDTH/8)
-SCREEN_BIT_DEPTH	equ 1
+SCREEN_BIT_DEPTH	equ 3   ; 3 bitplanes per playfield
 SCREEN_RES		equ 8 	; 8=lo resolution, 4=hi resolution
 RASTER_X_START		equ $81	; hard coded coordinates from hardware manual
 RASTER_Y_START		equ $2c
diff --git a/017.dual_playfield/dual_playfield_mode.s b/017.dual_playfield/dual_playfield_mode.s
index c553969..18f63c5 100644
--- a/017.dual_playfield/dual_playfield_mode.s
+++ b/017.dual_playfield/dual_playfield_mode.s
@@ -1,23 +1,22 @@
 	include "../include/registers.i"
 	include "hardware/dmabits.i"
 	include "hardware/intbits.i"
-	
 	include "constants.i"
 	
 entry:
 	lea 	CUSTOM,a6	
 	bsr	init
-	bsr.s	installColorPalette
 .mainLoop:
 	bsr 	waitVerticalBlank
-
 	bra	.mainLoop
 	
 	include "init.s"
 	include "utils.s"
 
-	
-pokeBitplanePointers: 		; d0 = frame offset in bytes, a0 = BPLP copper list address
+
+pokeBitplanePointers:
+ 	;; a0 = BPLP copper list address
+	;; a1 = address of playfield's interleaved bitplane data
 	movem.l	d0-a6,-(sp)
 	moveq	#SCREEN_BIT_DEPTH-1,d0
 .bitplaneloop:
@@ -33,24 +32,30 @@ pokeBitplanePointers: 		; d0 = frame offset in bytes, a0 = BPLP copper list addr
 
 	
 installColorPalette:
+	;; these palette files set the correct colors for each playfield
+	;; playfield1 uses COLOR00 -> COLOR07
 	include "out/playfield1-palette.s"
+	;; playfield2 uses COLOR08 -> COLOR15
 	include "out/playfield2-palette.s"
 	rts
 	
 copper:
-	;; bitplane pointers must be first else poking addresses will be incorrect
-pf1_bitplanepointers:	
+pf1_bitplanepointers:
+	;; this is where bitplanes are assigned to playfields
+	;; http://amigadev.elowar.com/read/ADCD_2.1/Hardware_Manual_guide/node0079.html
+	;; for 3 bitplanes per playfield, playfield1 gets bitplanes 1,3,5
 	dc.w	BPL1PTL,0
 	dc.w	BPL1PTH,0
-pf2_bitplanepointers:	
-	dc.w	BPL2PTL,0
-	dc.w	BPL2PTH,0
 	dc.w	BPL3PTL,0
 	dc.w	BPL3PTH,0
-	dc.w	BPL4PTL,0
-	dc.w	BPL4PTH,0
 	dc.w	BPL5PTL,0
 	dc.w	BPL5PTH,0
+pf2_bitplanepointers:
+	;; for 3 bitplanes per playfield, playfield2 gets bitplanes 2,4,6
+	dc.w	BPL2PTL,0
+	dc.w	BPL2PTH,0
+	dc.w	BPL4PTL,0
+	dc.w	BPL4PTH,0
 	dc.w	BPL6PTL,0
 	dc.w	BPL6PTH,0
 
diff --git a/017.dual_playfield/init.s b/017.dual_playfield/init.s
index 140a440..76ca918 100644
--- a/017.dual_playfield/init.s
+++ b/017.dual_playfield/init.s
@@ -8,10 +8,12 @@ init:
 	;; set up default palette
 	bsr.s	installColorPalette
 
+	;; poke playfield 1 bitplane pointers
 	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	
@@ -19,13 +21,17 @@ init:
 	;; set up playfield
 	move.w  #(RASTER_Y_START<<8)|RASTER_X_START,DIWSTRT(a6)
 	move.w	#((RASTER_Y_STOP-256)<<8)|(RASTER_X_STOP-256),DIWSTOP(a6)
-
+	
 	move.w	#(RASTER_X_START/2-SCREEN_RES),DDFSTRT(a6)
 	move.w	#(RASTER_X_START/2-SCREEN_RES)+(8*((SCREEN_WIDTH/16)-1)),DDFSTOP(a6)
 
+	;; enabled 2x the bitplanes as 2x playfields
 	move.w	#((SCREEN_BIT_DEPTH*2)<<12)|COLOR_ON|DBLPF,BPLCON0(a6)
+	;; set playfield2 to have priority
+	move.w	#PF2PRI, BPLCON2(a6)
 	move.w	#SCREEN_WIDTH_BYTES*SCREEN_BIT_DEPTH-SCREEN_WIDTH_BYTES,BPL1MOD(a6)
 	move.w	#SCREEN_WIDTH_BYTES*SCREEN_BIT_DEPTH-SCREEN_WIDTH_BYTES,BPL2MOD(a6)
+
 	
 
 	;; install copper list, then enable dma and selected interrupts
diff --git a/017.dual_playfield/screenshots/screenshot.png b/017.dual_playfield/screenshots/screenshot.png
new file mode 100644
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literal 0
HcmV?d00001

diff --git a/assets/playfield2_8.png b/assets/playfield2_8.png
new file mode 100644
index 0000000000000000000000000000000000000000..c8774eca6aa89cbf979a7e86934c55ac2641f9f0
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literal 0
HcmV?d00001

diff --git a/include/bplconbits.i b/include/bplconbits.i
index cda50b0..816b667 100644
--- a/include/bplconbits.i
+++ b/include/bplconbits.i
@@ -1,4 +1,5 @@
 COLOR_ON	equ $200
 LACE		equ $004
 HOMOD		equ $800
-DBLPF		equ $400
\ No newline at end of file
+DBLPF		equ $400
+PF2PRI	    	equ $040
\ No newline at end of file