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;;====================================;;

;; SA-1 32x32 Rotation Routine

;;====================================;;

;; How to Use:

;; 1. Put Graphics in !Source

;; 2. JSR to SUB_ROTATE

;; 3. Update contents of !DestBWRAM

;; to VRAM using CDMA Type #1, 4BPP,

;; 32 horizontal, 512 bytes.

;;====================================;;

;; Destination BW-RAM "Virtual RAM" & BW-RAM

!DestVRAM = $604000 ; Dest VRAM is same as BWRAM, but each byte is 4-bits only.

; i.e $40:0000 = $60:0000 | ($60:0001 << 4)

!DestBWRAM = $402000

;; RAM Definitions

!Degress = $6000 ; #$00 to #$FF ($00 = 0 degress)

!Scale = $6001 ; #$0000 to #$7FFF ($0100 = 100%)

;; Stracth RAM

!cosT = $04

!sinT = $06

!rowX = $08

!rowY = $0A

!X = $0C

!X = $00

!Y = $0E

!Pointer = $14

!Pointer2 = $17

;=====================

SUB_ROTATE:

PHP

PHD

REP #$30 ;| 16-bit AXY

LDA #$3100

TCD

LDA !Degress ;\ Calculate

AND #$00FF ;| Cos & Sin values

ASL ;|

TAX ;|

LDA.w CosTable,X ;|

STA !cosT ;|

TXA ;|

CLC ;|

ADC #$0180 ;|

AND #$01FE ;|

TAX ;|

LDA.w CosTable,X ;|

STA !sinT ;/

STZ $2250 ; scale cos/sin

LDA !Scale

STA $2251

LDA !cosT

STA $2253

NOP

LDY !sinT

LDA $2307

STA !cosT

STY $2253

NOP

BRA $00

LDA $2307

STA !sinT

LDA #$FFF0 ; center and correct starting X/Y position

STA $2251

LDA !cosT

STA $2253

NOP

LDY !sinT

LDA $2306

STA !rowX

STA !rowY

STY $2253

NOP

BRA $00

LDA $2306

CLC

ADC !rowX

CLC

ADC #$1000

SEC

SBC !cosT

STA !rowX

STA !X

LDA !rowY

SEC

SBC $2306

CLC

ADC #$1000

CLC

ADC !sinT

STA !rowY

STA !Y

TAY

STZ !Pointer ; Clear source bitmap pointer

SEP #$10 ; XY 8-bit

LDA #!DestVRAM

STA !Pointer

LDA #!DestVRAM>>8

STA !Pointer+1

PHB

LDX #$40

PEA $4040

PHX

PLB

STZ $02

LDA #$0030 ;high byte

STA !X+2

LDY #$1F

LDA #$001F

STA $1E

.Y_Loop

STY $1F

LDX #$001F

LDY #$1F

CLC

.X_Loop

LDA !X

CLC

ADC !cosT

STA !X

CMP #$2000

BCS .contX_Loop1

AND #$FF00

STA $00

LDA !Y

TYA

SEC

SBC !sinT

STA !Y

TAY

CMP #$2000

BCS .contX_Loop2

AND #$FF00

AND #$1F00

LSR

ADC $01

ADC !X+1

REP #$10

STA !Pointer2

TAX

SEP #$20

LDA $3000,x ;$403000

LDA (!Pointer2)

LDX !Pointer

STA [!Pointer]

STA !DestVRAM,X

REP #$21

SEP #$10

REP #$20

.contX_Loop2

INC !Pointer

DEY

DEX

BPL .X_Loop

LDY $1F

LDA !rowX

CLC

ADC !sinT

STA !rowX

STA !X

LDA !rowY

CLC

ADC !cosT

STA !rowY

STA !Y

TAY

DEY

DEC $1E

BPL .Y_Loop

SEP #$30

PLB

PLD

PLP

RTS

.contX_Loop1

LDA !Y

TYA

SBC !sinT

STA !Y

TAY

BRA .contX_Loop2

CosTable:

dw $0100,$0100,$0100,$00FF,$00FF,$00FE,$00FD,$00FC,$00FB,$00FA,$00F8,$00F7,$00F5,$00F3,$00F1,$00EF

dw $00ED,$00EA,$00E7,$00E5,$00E2,$00DF,$00DC,$00D8,$00D5,$00D1,$00CE,$00CA,$00C6,$00C2,$00BE,$00B9

dw $00B5,$00B1,$00AC,$00A7,$00A2,$009D,$0098,$0093,$008E,$0089,$0084,$007E,$0079,$0073,$006D,$0068

dw $0062,$005C,$0056,$0050,$004A,$0044,$003E,$0038,$0032,$002C,$0026,$001F,$0019,$0013,$000D,$0006

dw $0000,$FFFA,$FFF3,$FFED,$FFE7,$FFE1,$FFDA,$FFD4,$FFCE,$FFC8,$FFC2,$FFBC,$FFB6,$FFB0,$FFAA,$FFA4

dw $FF9E,$FF98,$FF93,$FF8D,$FF87,$FF82,$FF7C,$FF77,$FF72,$FF6D,$FF68,$FF63,$FF5E,$FF59,$FF54,$FF4F

dw $FF4B,$FF47,$FF42,$FF3E,$FF3A,$FF36,$FF32,$FF2F,$FF2B,$FF28,$FF24,$FF21,$FF1E,$FF1B,$FF19,$FF16

dw $FF13,$FF11,$FF0F,$FF0D,$FF0B,$FF09,$FF08,$FF06,$FF05,$FF04,$FF03,$FF02,$FF01,$FF01,$FF00,$FF00

dw $FF00,$FF00,$FF00,$FF01,$FF01,$FF02,$FF03,$FF04,$FF05,$FF06,$FF08,$FF09,$FF0B,$FF0D,$FF0F,$FF11

dw $FF13,$FF16,$FF19,$FF1B,$FF1E,$FF21,$FF24,$FF28,$FF2B,$FF2F,$FF32,$FF36,$FF3A,$FF3E,$FF42,$FF47

dw $FF4B,$FF4F,$FF54,$FF59,$FF5E,$FF63,$FF68,$FF6D,$FF72,$FF77,$FF7C,$FF82,$FF87,$FF8D,$FF93,$FF98

dw $FF9E,$FFA4,$FFAA,$FFB0,$FFB6,$FFBC,$FFC2,$FFC8,$FFCE,$FFD4,$FFDA,$FFE1,$FFE7,$FFED,$FFF3,$FFFA

dw $0000,$0006,$000D,$0013,$0019,$001F,$0026,$002C,$0032,$0038,$003E,$0044,$004A,$0050,$0056,$005C

dw $0062,$0068,$006D,$0073,$0079,$007E,$0084,$0089,$008E,$0093,$0098,$009D,$00A2,$00A7,$00AC,$00B1

dw $00B5,$00B9,$00BE,$00C2,$00C6,$00CA,$00CE,$00D1,$00D5,$00D8,$00DC,$00DF,$00E2,$00E5,$00E7,$00EA

dw $00ED,$00EF,$00F1,$00F3,$00F5,$00F7,$00F8,$00FA,$00FB,$00FC,$00FD,$00FE,$00FF,$00FF,$0100,$0100

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;;====================================;;
;; SA-1 32x32 Rotation Routine
;;====================================;;

;;====================================;;
;; How to Use:
;; 1. Put Graphics in !Source
;; 2. JSR to SUB_ROTATE
;; 3. Update contents of !DestBWRAM
;; to VRAM using CDMA Type #1, 4BPP,
;; 32 horizontal, 512 bytes.
;;====================================;;

;; Destination BW-RAM "Virtual RAM" & BW-RAM
!DestVRAM = $604000		; Dest VRAM is same as BWRAM, but each byte is 4-bits only.
				; i.e $40:0000 = $60:0000 | ($60:0001 << 4)
!DestBWRAM = $402000

;; RAM Definitions
!Degress = $6000 ; #$00 to #$FF ($00 = 0 degress)
!Scale = $6001 ; #$0000 to #$7FFF ($0100 = 100%)

;; Stracth RAM
!cosT = $04
!sinT = $06
!rowX = $08
!rowY = $0A
!X = $0C
!Y = $0E
!Pointer = $14

;=====================

SUB_ROTATE:
	PHP
	PHD
	REP #$30			;| 16-bit AXY
	LDA #$3100
	TCD

LDA !Degress			;\ Calculate
	AND #$00FF			;| Cos & Sin values
	ASL				;|
	TAX				;|
	LDA.w CosTable,X		;|
	STA !cosT			;|
	TXA				;|
	CLC				;|
	ADC #$0180			;|	
	AND #$01FE			;|
	TAX				;|
	LDA.w CosTable,X		;|
	STA !sinT			;/
	
	STZ $2250			; scale cos/sin
	LDA !Scale
	STA $2251
	LDA !cosT
	STA $2253
	NOP
	LDY !sinT
	LDA $2307
	STA !cosT
	STY $2253
	NOP
	BRA $00
	LDA $2307
	STA !sinT
	
	LDA #$FFF0			; center and correct starting X/Y position
	STA $2251
	LDA !cosT
	STA $2253
	NOP
	LDY !sinT
	LDA $2306
	STA !rowX
	STA !rowY
	STY $2253
	NOP
	BRA $00
	LDA $2306
	CLC
	ADC !rowX
	CLC
	ADC #$1000
	SEC
	SBC !cosT
	STA !rowX
	STA !X
	LDA !rowY
	SEC
	SBC $2306
	CLC
	ADC #$1000
	CLC
	ADC !sinT
	STA !rowY
	STA !Y
	
	STZ !Pointer			; Clear source bitmap pointer
	
	SEP #$10			; XY 8-bit
	
	PHB
	LDX #$40
	PHX
	PLB
	
	STZ $02
	
	LDY #$1F
.Y_Loop
	STY $1F
	LDY #$1F
.X_Loop
	LDA !X
	CLC
	ADC !cosT
	STA !X
	
	CMP #$2000
	BCS .contX_Loop1
	AND #$FF00
	STA $00

LDA !Y
	SEC
	SBC !sinT
	STA !Y
	
	CMP #$2000
	BCS .contX_Loop2
	AND #$FF00
	LSR
	LSR
	LSR
	ADC $01
	REP #$10
	TAX
	SEP #$20
	LDA $3000,x ;$403000
	LDX !Pointer
	STA !DestVRAM,X
	SEP #$10
	REP #$20

.contX_Loop2
	INC !Pointer
	DEY
	BPL .X_Loop
	LDY $1F
	
	LDA !rowX
	CLC
	ADC !sinT
	STA !rowX
	STA !X
	
	LDA !rowY
	CLC
	ADC !cosT
	STA !rowY
	STA !Y
	
	DEY
	BPL .Y_Loop
	
	SEP #$30
	
	PLB
	PLD
	PLP
	RTS

.contX_Loop1
	LDA !Y
	SBC !sinT
	STA !Y
	BRA .contX_Loop2

CosTable:
dw $0100,$0100,$0100,$00FF,$00FF,$00FE,$00FD,$00FC,$00FB,$00FA,$00F8,$00F7,$00F5,$00F3,$00F1,$00EF
dw $00ED,$00EA,$00E7,$00E5,$00E2,$00DF,$00DC,$00D8,$00D5,$00D1,$00CE,$00CA,$00C6,$00C2,$00BE,$00B9
dw $00B5,$00B1,$00AC,$00A7,$00A2,$009D,$0098,$0093,$008E,$0089,$0084,$007E,$0079,$0073,$006D,$0068
dw $0062,$005C,$0056,$0050,$004A,$0044,$003E,$0038,$0032,$002C,$0026,$001F,$0019,$0013,$000D,$0006
dw $0000,$FFFA,$FFF3,$FFED,$FFE7,$FFE1,$FFDA,$FFD4,$FFCE,$FFC8,$FFC2,$FFBC,$FFB6,$FFB0,$FFAA,$FFA4
dw $FF9E,$FF98,$FF93,$FF8D,$FF87,$FF82,$FF7C,$FF77,$FF72,$FF6D,$FF68,$FF63,$FF5E,$FF59,$FF54,$FF4F
dw $FF4B,$FF47,$FF42,$FF3E,$FF3A,$FF36,$FF32,$FF2F,$FF2B,$FF28,$FF24,$FF21,$FF1E,$FF1B,$FF19,$FF16
dw $FF13,$FF11,$FF0F,$FF0D,$FF0B,$FF09,$FF08,$FF06,$FF05,$FF04,$FF03,$FF02,$FF01,$FF01,$FF00,$FF00
dw $FF00,$FF00,$FF00,$FF01,$FF01,$FF02,$FF03,$FF04,$FF05,$FF06,$FF08,$FF09,$FF0B,$FF0D,$FF0F,$FF11
dw $FF13,$FF16,$FF19,$FF1B,$FF1E,$FF21,$FF24,$FF28,$FF2B,$FF2F,$FF32,$FF36,$FF3A,$FF3E,$FF42,$FF47
dw $FF4B,$FF4F,$FF54,$FF59,$FF5E,$FF63,$FF68,$FF6D,$FF72,$FF77,$FF7C,$FF82,$FF87,$FF8D,$FF93,$FF98
dw $FF9E,$FFA4,$FFAA,$FFB0,$FFB6,$FFBC,$FFC2,$FFC8,$FFCE,$FFD4,$FFDA,$FFE1,$FFE7,$FFED,$FFF3,$FFFA
dw $0000,$0006,$000D,$0013,$0019,$001F,$0026,$002C,$0032,$0038,$003E,$0044,$004A,$0050,$0056,$005C
dw $0062,$0068,$006D,$0073,$0079,$007E,$0084,$0089,$008E,$0093,$0098,$009D,$00A2,$00A7,$00AC,$00B1
dw $00B5,$00B9,$00BE,$00C2,$00C6,$00CA,$00CE,$00D1,$00D5,$00D8,$00DC,$00DF,$00E2,$00E5,$00E7,$00EA
dw $00ED,$00EF,$00F1,$00F3,$00F5,$00F7,$00F8,$00FA,$00FB,$00FC,$00FD,$00FE,$00FF,$00FF,$0100,$0100

Texte modifié

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;;====================================;;
;; SA-1 32x32 Rotation Routine
;;====================================;;

;; Destination BW-RAM "Virtual RAM" & BW-RAM
!DestVRAM = $604000		; Dest VRAM is same as BWRAM, but each byte is 4-bits only.
				; i.e $40:0000 = $60:0000 | ($60:0001 << 4)
!DestBWRAM = $402000

;; RAM Definitions
!Degress = $6000 ; #$00 to #$FF ($00 = 0 degress)
!Scale = $6001 ; #$0000 to #$7FFF ($0100 = 100%)

;; Stracth RAM
!cosT = $04
!sinT = $06
!rowX = $08
!rowY = $0A
!X = $00
!Y = $0E
!Pointer = $14
!Pointer2 = $17

;=====================

SUB_ROTATE:
	PHP
	PHD
	REP #$30			;| 16-bit AXY
	LDA #$3100
	TCD

LDA !Degress			;\ Calculate
	AND #$00FF			;| Cos & Sin values
	ASL				;|
	TAX				;|
	LDA.w CosTable,X		;|
	STA !cosT			;|
	TXA				;|
	CLC				;|
	ADC #$0180			;|	
	AND #$01FE			;|
	TAX				;|
	LDA.w CosTable,X		;|
	STA !sinT			;/
	
	STZ $2250			; scale cos/sin
	LDA !Scale
	STA $2251
	LDA !cosT
	STA $2253
	NOP
	LDY !sinT
	LDA $2307
	STA !cosT
	STY $2253
	NOP
	BRA $00
	LDA $2307
	STA !sinT
	
	LDA #$FFF0			; center and correct starting X/Y position
	STA $2251
	LDA !cosT
	STA $2253
	NOP
	LDY !sinT
	LDA $2306
	STA !rowX
	STA !rowY
	STY $2253
	NOP
	BRA $00
	LDA $2306
	CLC
	ADC !rowX
	CLC
	ADC #$1000
	SEC
	SBC !cosT
	STA !rowX
	STA !X
	LDA !rowY
	SEC
	SBC $2306
	CLC
	ADC #$1000
	CLC
	ADC !sinT
	STA !rowY
	TAY
	
	LDA #!DestVRAM
	STA !Pointer
	LDA #!DestVRAM>>8
	STA !Pointer+1
	
	PHB
	PEA $4040
	PLB
	PLB
	
	LDA #$0030 ;high byte
	STA !X+2
	
	LDA #$001F
	STA $1E
	
.Y_Loop
	LDX #$001F
	CLC
.X_Loop
	LDA !X
	ADC !cosT
	STA !X
	
	CMP #$2000
	BCS .contX_Loop1

TYA
	SEC
	SBC !sinT
	TAY
	
	CMP #$2000
	BCS .contX_Loop2
	AND #$1F00
	LSR
	LSR
	LSR
	ADC !X+1
	STA !Pointer2
	SEP #$20
	LDA (!Pointer2)
	STA [!Pointer]
	REP #$21

.contX_Loop2
	INC !Pointer
	DEX
	BPL .X_Loop
	
	LDA !rowX
	CLC
	ADC !sinT
	STA !rowX
	STA !X
	
	LDA !rowY
	CLC
	ADC !cosT
	STA !rowY
	TAY
	
	DEC $1E
	BPL .Y_Loop
	
	SEP #$30
	
	PLB
	PLD
	PLP
	RTS

.contX_Loop1
	TYA
	SBC !sinT
	TAY
	BRA .contX_Loop2