2022-12-22 00:26:50 +00:00
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* AUXMEM.SHR.S
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* (c) Bobbi 2022 GPLv3
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*
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* Routines for drawing bitmapped text and graphics in SHR mode
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2022-12-22 18:44:40 +00:00
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* on Apple IIGS (640x200 4 colour, or 320x200 16 colour.)
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2022-12-22 00:26:50 +00:00
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*
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2022-12-23 01:58:38 +00:00
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SCB320 EQU $00 ; SCB for 320 mode
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SCB640 EQU $80 ; SCB for 640 mode
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2022-12-24 04:26:16 +00:00
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2022-12-23 03:37:46 +00:00
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* Colours in the following order.
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* For 16 colour modes ...
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* BLACK, RED, GREEN, YELLOW, BLUE, MAGENTA, CYAN, WHITE, ...
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* For 4 colour modes ...
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* BLACK, RED, YELLOW, WHITE
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PALETTE320 DB $00, $00 ; BLACK
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DB $00, $08 ; RED
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DB $80, $00 ; GREEN
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DB $80, $08 ; YELLOW
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DB $08, $00 ; BLUE
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DB $08, $08 ; MAGENTA
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DB $88, $00 ; CYAN
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2022-12-24 02:11:32 +00:00
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DB $88, $08 ; WHITE
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2022-12-23 03:37:46 +00:00
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DB $00, $00 ; BLACK
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DB $00, $08 ; RED
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DB $80, $00 ; GREEN
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DB $80, $08 ; YELLOW
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DB $08, $00 ; BLUE
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DB $08, $08 ; MAGENTA
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DB $88, $00 ; CYAN
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DB $88, $08 ; WHITE
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PALETTE640 DB $00, $00 ; BLACK
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DB $00, $08 ; RED
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DB $80, $08 ; YELLOW
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DB $88, $08 ; WHITE
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DB $00, $00 ; BLACK
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DB $00, $08 ; RED
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DB $80, $08 ; YELLOW
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DB $88, $08 ; WHITE
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DB $00, $00 ; BLACK
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DB $00, $08 ; RED
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DB $80, $08 ; YELLOW
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DB $88, $08 ; WHITE
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DB $00, $00 ; BLACK
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DB $00, $08 ; RED
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DB $80, $08 ; YELLOW
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DB $88, $08 ; WHITE
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2022-12-24 04:26:16 +00:00
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SHRCOLMASK DB $00 ; Colour mask
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2022-12-25 01:16:20 +00:00
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* Addresses of start of text rows in SHR
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* LS byte is always zero
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* Add $A0 to get to next row of pixels
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SHRTAB DB $20 ; Text row 0
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DB $25 ; Text row 1
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DB $2a ; Text row 2
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DB $2f ; Text row 3
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DB $34 ; Text row 4
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DB $39 ; Text row 5
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DB $3e ; Text row 6
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DB $43 ; Text row 7
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DB $48 ; Text row 8
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DB $4d ; Text row 9
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DB $52 ; Text row 10
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DB $57 ; Text row 11
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DB $5c ; Text row 12
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DB $61 ; Text row 13
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DB $66 ; Text row 14
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DB $6b ; Text row 15
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DB $70 ; Text row 16
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DB $75 ; Text row 17
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DB $7a ; Text row 18
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DB $7f ; Text row 19
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DB $84 ; Text row 20
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DB $89 ; Text row 21
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DB $8e ; Text row 22
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DB $93 ; Text row 23
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2022-12-22 18:44:40 +00:00
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* Enable SHR mode
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2022-12-26 06:54:45 +00:00
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SHRVDU22 LDA #$18 ; Inhibit SHR & aux HGR shadowing
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2022-12-25 04:18:03 +00:00
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TSB SHADOW
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2022-12-22 18:44:40 +00:00
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LDA #$80 ; Most significant bit
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TSB NEWVIDEO ; Enable SHR mode
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2022-12-23 03:37:46 +00:00
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LDA VDUPIXELS ; Pixels per byte
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CMP #$02 ; 2 is 320-mode (MODE 1)
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BNE :MODE0
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2022-12-24 02:11:32 +00:00
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LDA #SCB320 ; SCB for 320-mode
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2022-12-23 03:37:46 +00:00
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LDY #00 ; Palette offset
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2022-12-25 19:40:50 +00:00
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STZ CLR80VID ; 40 column text mode
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2022-12-23 03:37:46 +00:00
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BRA :S1
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2022-12-24 02:11:32 +00:00
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:MODE0 LDA #SCB640 ; SCB for 640-mode
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2022-12-23 03:37:46 +00:00
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LDY #32 ; Palette offset
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2022-12-25 19:40:50 +00:00
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STZ SET80VID ; 80 column text mode
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2022-12-23 03:37:46 +00:00
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:S1 LDX #$00
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:L1 STAL $E19D00,X ; SCBs begin at $9D00 in $E1
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INX
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CPX #200 ; 200 lines so 200 SCBs
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BNE :L1
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LDX #$00
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2022-12-24 02:11:32 +00:00
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:L2 LDA PALETTE320,Y ; Offset in Y computed above
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2022-12-23 03:44:06 +00:00
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STAL $E19E00,X ; Palettes begin at $9E00 in $E1
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2022-12-23 03:37:46 +00:00
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INX
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INY
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2022-12-23 03:44:06 +00:00
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CPX #32 ; 32 bytes in palette
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2022-12-23 03:37:46 +00:00
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BNE :L2
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2022-12-26 06:54:45 +00:00
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JSR SHRXPLDFONT ; Explode font -> SHRFONTXPLD table
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2022-12-25 19:40:50 +00:00
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JSR VDU12 ; Clear text and SHR screen
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2022-12-22 18:44:40 +00:00
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RTS
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2022-12-22 00:26:50 +00:00
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2022-12-23 01:58:38 +00:00
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2022-12-26 06:54:45 +00:00
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SHRFONTXPLD EQU $A000 ; Explode SHR font to $E1:A000
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* Explode font to generate SHRFONTXPLD table
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* This is 2 bytes x 8 rows for each character in 640 mode
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* or 4 bytes x 8 rows for each character in 320 mode
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SHRXPLDFONT LDA #<SHRFONTXPLD ; Use VDUADDR to point to ..
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STA VDUADDR+0 ; .. start of table to write
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LDA #>SHRFONTXPLD
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STA VDUADDR+1
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LDA #$E1
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STA VDUBANK
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LDA #32 ; First char number
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:L1 JSR SHRXPLDCHAR ; Explode char A
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INC A
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CMP #128 ; 96 chars in FONT8
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BNE :L1
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RTS
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* Explode one character to location pointed to by VDUADDR
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* On entry: A - character to explode
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SHRXPLDCHAR PHA
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SEC
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2022-12-24 02:11:32 +00:00
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SBC #32
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STA ZP1+0 ; A*8 -> ZP1
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STZ ZP1+1
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ASL ZP1+0
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ROL ZP1+1
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ASL ZP1+0
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ROL ZP1+1
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ASL ZP1+0
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ROL ZP1+1
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CLC ; FONT8+A*8 -> ZP1
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LDA ZP1+0
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ADC #<FONT8
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STA ZP1+0
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LDA ZP1+1
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ADC #>FONT8
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STA ZP1+1
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LDY #$00 ; First row of char
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:L1 >>> RDMAIN
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LDA (ZP1),Y ; Load row of font
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>>> RDAUX
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LDX VDUPIXELS ; Pixels per byte
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CPX #$02 ; 2 is 320-mode (MODE 1)
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BNE :S1
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JSR SHRCHAR320
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BRA :S2
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:S1 JSR SHRCHAR640
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2022-12-26 06:54:45 +00:00
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:S2 LDX VDUPIXELS ; Pixels per byte
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CPX #$02 ; 2 is 320-mode (MODE 1)
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BNE :S3
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CLC ; 320 mode: add 4 to VDUADDR
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LDA VDUADDR+0
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ADC #$04
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STA VDUADDR+0
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LDA VDUADDR+1
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ADC #$00
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STA VDUADDR+1
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BRA :S4
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:S3 CLC ; 640 mode: add 2 to VDUADDR
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LDA VDUADDR+0
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ADC #$02
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STA VDUADDR+0
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LDA VDUADDR+1
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ADC #$00
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STA VDUADDR+1
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:S4 INY ; Next row of font
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2022-12-24 02:11:32 +00:00
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CPY #$08 ; Last row?
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BNE :L1
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2022-12-26 06:54:45 +00:00
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PLA
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2022-12-24 02:11:32 +00:00
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RTS
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* Draw one pixel row of font in 320 mode
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* 4 bytes per char, 4 bits per pixel
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2022-12-25 04:18:03 +00:00
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* TODO: Implement this
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2022-12-24 02:11:32 +00:00
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SHRCHAR320 PHY
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LDA #$FF
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LDY #$00
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STA [VDUADDR],Y
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INY
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STA [VDUADDR],Y
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INY
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STA [VDUADDR],Y
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INY
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STA [VDUADDR],Y
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PLY
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2022-12-23 01:58:38 +00:00
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RTS
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2022-12-24 02:11:32 +00:00
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* Draw one pixel row of font in 640 mode
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* 2 bytes per char, 2 bits per pixel
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SHRCHAR640 PHY
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2022-12-25 04:27:08 +00:00
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STZ ZP2
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2022-12-24 02:11:32 +00:00
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LDX #$00 ; Source bit index
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:L1 ASL ; MS bit -> C
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PHP ; Preserve C
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2022-12-25 04:27:08 +00:00
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ROL ZP2 ; C -> LS bit
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2022-12-24 02:11:32 +00:00
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PLP ; Recover C
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2022-12-25 04:27:08 +00:00
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ROL ZP2 ; C -> LS bit
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2022-12-24 02:11:32 +00:00
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INX
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2022-12-25 04:27:08 +00:00
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CPX #$04
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BNE :L1
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2022-12-24 02:11:32 +00:00
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PHA
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2022-12-25 04:27:08 +00:00
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LDA ZP2
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AND SHRCOLMASK ; Mask to set colour
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STA [VDUADDR]
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2022-12-24 02:11:32 +00:00
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PLA
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2022-12-25 04:27:08 +00:00
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STZ ZP2
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LDX #$00
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2022-12-24 02:11:32 +00:00
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:L2 ASL ; MS bit -> C
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PHP ; Preserve C
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2022-12-25 04:27:08 +00:00
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ROL ZP2 ; C -> LS bit
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2022-12-24 02:11:32 +00:00
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PLP ; Recover C
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2022-12-25 04:27:08 +00:00
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ROL ZP2 ; C -> LS bit
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2022-12-24 02:11:32 +00:00
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INX
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2022-12-25 04:27:08 +00:00
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CPX #$04
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BNE :L2
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LDA ZP2
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LDY #$01
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AND SHRCOLMASK ; Mask to set colour
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STA [VDUADDR],Y
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2022-12-24 02:11:32 +00:00
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PLY
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RTS
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2022-12-26 06:54:45 +00:00
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* Write character to SHR screen
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* On entry: A - character to write
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* TODO: This is for 640 mode only at the moment
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SHRPRCHAR SEC
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SBC #32
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STA VDUADDR2+0 ; A*16 -> VDUADDR2
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STZ VDUADDR2+1
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ASL VDUADDR2+0
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ROL VDUADDR2+1
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ASL VDUADDR2+0
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ROL VDUADDR2+1
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ASL VDUADDR2+0
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ROL VDUADDR2+1
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ASL VDUADDR2+0
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ROL VDUADDR2+1
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CLC ; SHRFONTXPLD+A*16 -> VDUADDR2
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LDA VDUADDR2+0
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ADC #<SHRFONTXPLD
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STA VDUADDR2+0
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LDA VDUADDR2+1
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ADC #>SHRFONTXPLD
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STA VDUADDR2+1
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LDA #$E1
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STA VDUBANK2
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JSR SHRCHARADDR ; Screen addr in VDUADDR
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LDX #$00 ; First row of char
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:L1 LDY #$00
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LDA [VDUADDR2] ; Load exploded font data 1st byte
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STA [VDUADDR] ; Store on screen
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INY
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INC VDUADDR2+0 ; Increment exploded font ptr
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BNE :S1
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INC VDUADDR2+1
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:S1 LDA [VDUADDR2] ; Load exploded font data 2nd byte
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STA [VDUADDR],Y ; Store on screen
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INC VDUADDR2+0 ; Increment exploded font ptr
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BNE :S2
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INC VDUADDR2+1
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:S2 JSR SHRNEXTROW ; Add 160 to VDUADDR
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INX ; Next row of font
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CPX #$08 ; Last row?
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BNE :L1
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RTS
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2022-12-23 01:58:38 +00:00
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* Calculate character address in SHR screen memory
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2022-12-24 02:11:32 +00:00
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* This is the address of the first pixel row of the char
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* Add $00A0 for each subsequent row
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2022-12-25 01:16:20 +00:00
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SHRCHARADDR LDY VDUTEXTY
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LDA SHRTAB,Y ; MSB
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STA VDUADDR+1
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2022-12-24 02:11:32 +00:00
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LDA VDUTEXTX
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ASL ; Mult x 2 (4 pixels/byte)
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LDY VDUPIXELS ; Pixels per byte
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CPY #$02 ; 2 pixels per byte in 320 mode
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2022-12-25 01:16:20 +00:00
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BNE :S1
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2022-12-24 02:11:32 +00:00
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ASL ; Mult x 2 (2 pixels/byte)
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2022-12-25 01:16:20 +00:00
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:S1 STA VDUADDR+0 ; LSB of address
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2022-12-24 02:11:32 +00:00
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LDA #$E1 ; Bank $E1
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STA VDUBANK
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2022-12-23 01:58:38 +00:00
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RTS
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2022-12-24 02:11:32 +00:00
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* (VDUADDR)=>character address, X=preserved
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2022-12-23 01:58:38 +00:00
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2022-12-24 06:06:40 +00:00
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* Advance VDUADDR to the next row of pixels
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SHRNEXTROW LDA VDUADDR+0 ; Add 160 to VDUADDR
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CLC
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ADC #160
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STA VDUADDR+0
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LDA VDUADDR+1
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ADC #$00
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STA VDUADDR+1
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RTS
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2022-12-23 01:58:38 +00:00
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* Forwards scroll one line
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2022-12-25 01:16:20 +00:00
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* Copy text line A+1 to line A
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* TODO: This is only for 640 mode at present
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SHRSCR1LINE TAY
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LDA SHRTAB,Y ; MSB of address of line A
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STA VDUADDR+1
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STZ VDUADDR+0 ; Addr of start of line
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INY
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LDA SHRTAB,Y ; MSB of address of line A+1
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STA VDUADDR2+1
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STZ VDUADDR2+0 ; Addr of start of line
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LDA #$E1 ; Bank $E1
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STA VDUBANK
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STA VDUBANK2
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LDA #$08 ; Eight rows of pixels
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STA :CTR
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INC TXTWINRGT
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:L0 LDA TXTWINLFT
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TAX
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ASL ; 2 bytes / char
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TAY
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:L1 CPX TXTWINRGT
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BCS :S1
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LDA [VDUADDR2],Y
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STA [VDUADDR],Y
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INY
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LDA [VDUADDR2],Y
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STA [VDUADDR],Y
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INY
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INX
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BRA :L1
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:S1 JSR SHRNEXTROW ; Add 160 to VDUADDR
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LDA VDUADDR2+0 ; Add 160 to VDUADDR2
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CLC
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ADC #160
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STA VDUADDR2+0
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LDA VDUADDR2+1
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ADC #$00
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STA VDUADDR2+1
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DEC :CTR
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BNE :L0
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DEC TXTWINRGT
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2022-12-23 01:58:38 +00:00
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RTS
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* Reverse scroll one line
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2022-12-25 01:16:20 +00:00
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* Copy text line A to line A+1
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2022-12-25 04:18:03 +00:00
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* TODO: Implement this
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2022-12-23 01:58:38 +00:00
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SHRRSCR1LINE
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RTS
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* Clear from current location to EOL
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2022-12-24 06:06:40 +00:00
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* TODO: This is only for 640 mode at present
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SHRCLREOL JSR SHRCHARADDR
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STZ VDUADDR+0 ; Addr of start of line
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2022-12-25 01:16:20 +00:00
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LDA #$08 ; Eight rows of pixels
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2022-12-24 06:06:40 +00:00
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STA :CTR
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2022-12-24 06:11:15 +00:00
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INC TXTWINRGT
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2022-12-24 06:06:40 +00:00
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:L0 LDA VDUTEXTX
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TAX
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ASL ; 2 bytes / char
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TAY
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LDA #$00
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:L1 CPX TXTWINRGT
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BCS :S1
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STA [VDUADDR],Y
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INY
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STA [VDUADDR],Y
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INY
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INX
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BRA :L1
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:S1 JSR SHRNEXTROW
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DEC :CTR
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BNE :L0
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2022-12-24 06:11:15 +00:00
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DEC TXTWINRGT
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2022-12-23 01:58:38 +00:00
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RTS
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2022-12-24 06:06:40 +00:00
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:CTR DB $00
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2022-12-23 01:58:38 +00:00
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* VDU16 (CLG) clears the whole SHR screen right now
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2022-12-23 04:16:39 +00:00
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SHRCLEAR PHP ; Disable interrupts
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SEI
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CLC ; 816 native mode
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2022-12-23 03:37:46 +00:00
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XCE
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2022-12-24 06:11:15 +00:00
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REP #$10 ; 16 bit index
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MX %10 ; Tell Merlin
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LDX #$0000
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LDA #$00
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:L1 STAL $E12000,X ; SHR screen @ E1:2000
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2022-12-23 03:37:46 +00:00
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INX
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2022-12-24 06:11:15 +00:00
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CPX #$7D00
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BNE :L1
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SEP #$10 ; Back to 8 bit index
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MX %11 ; Tell Merlin
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2022-12-23 03:37:46 +00:00
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SEC ; Back to 6502 emu mode
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XCE
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2022-12-23 04:16:39 +00:00
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PLP ; Normal service resumed
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2022-12-23 01:58:38 +00:00
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RTS
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2022-12-24 04:26:16 +00:00
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* Set text colour
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* A=txt colour
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2022-12-25 04:18:03 +00:00
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* TODO: Need to add support for 320 mode also
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2022-12-25 19:40:50 +00:00
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SHRSETTCOL AND #$03
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TAX
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2022-12-24 04:26:16 +00:00
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LDA :MASKS640,X ; Lookup mask in table
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STA SHRCOLMASK ; Set colour mask
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RTS
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:MASKS640 DB %00000000
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DB %01010101
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DB %10101010
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DB %11111111
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