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VDU24 (define gfx window) sorta working.

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Bobbi Webber-Manners 2023-01-05 20:26:44 -05:00
parent 837e42e101
commit 62aa305c96
3 changed files with 103 additions and 13 deletions
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BIN
applecorn.po
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20
auxmem.vdu.s
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@ -1089,12 +1089,20 @@ VDU28C LDY #TXTWINLFT+3-VDUVARS ; Copy to txt window params
VDU28D RTS
* VDU 24,left;bottom;right;top; - define graphics window
VDU24 RTS
* If right<left, exit
* If right>width, exit
* If top<bottom, exit
* If top>height, exit
* scale parameters
VDU24 BIT VDUBANK ; Check if this is a GS
BMI :GS
RTS ; If not, hasta la vista
:GS LDX #$08
>>> WRTMAIN
:L1 LDA VDUQGFXWIND,X ; Copy to main mem for SHR
STA SHRVDUQ,X
DEX
BNE :L1
>>> WRTAUX
>>> XF2MAIN,SHRVDU24
VDU24RETBAD >>> ENTAUX
RTS ; Validation failure
VDU24RET >>> ENTAUX
LDY #GFXWINLFT+7-VDUVARS ; Copy to gfx window params
LDA #$08
BNE COPYVDUQ

96
mainmem.shr.s
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@ -15,7 +15,7 @@ SHRFONTXPLD EQU $A000 ; Explode SHR font to $E1:A000
******************************************************************************
* 25 bytes of persistent storage
* 33 bytes of persistent storage
* TODO: Move to SHRZP maybe
SHRPIXELS DB $00 ; Main memory copy of VDUPIXELS
SHRVDUQ DS 16 ; Main memory copy of VDUQ
@ -25,6 +25,10 @@ SHRGFXBGMASK DB $00 ; Background colour mask
SHRGFXACTION DB $00 ; GCOL action for point plotting
SHRXPIXEL DW $0000 ; Previous point in screen coords
SHRYPIXEL DW $0000 ; Previous point in screen coords
SHRWINLFT DW 0 ; Graphics window - left
SHRWINRGT DW 639 ; Graphics window - right
SHRWINTOP DW 0 ; Graphics window - top
SHRWINBTM DW 199 ; Graphics window - bottom
* Explode font to generate SHRFONTXPLD table
@ -302,15 +306,15 @@ SHRPLOTCOL LDA SHRGFXFGMASK ; Preserve FG colour
* Called in 65816 native mode, 8 bit M & X
SHRPOINT REP #$30 ; 16 bit M & X
MX %00 ; Tell Merlin
LDA A2L
CMP #000 ; TODO: Top of window
LDA A2L ; y coordinate
CMP SHRWINTOP
BMI :OUT
CMP #200 ; TODO: Bottom of window
CMP SHRWINBTM
BPL :OUT
LDA A1L
CMP #000 ; TODO: Left of window
LDA A1L ; x coordinate
CMP SHRWINLFT
BMI :OUT
CMP #640 ; TODO: Right of window
CMP SHRWINRGT
BPL :OUT
SEP #$30 ; 8 bit M & X
MX %11 ; Tell Merlin
@ -748,6 +752,84 @@ SHRCOORD PHP ; Disable interrupts
RTS
* Another coordinate transform, used by VDU25
* Same as SHRCOORD above, except it is entered in native, 16 bit M & X mode
* Assumes positive coordinates.
* On entry: X is offset into SHRVDUQ to find coordinate
* On return: Coverted coordinats in A1L/H, A2L/H
SHRCOORD2 MX $00 ; Tell Merlin it's 16 bit
* X-coordinate in SHRVDUQ+5,+6 1280/2=640
LDA SHRVDUQ,X
ASL ; Sign bit -> C
ROR SHRVDUQ,X ; Signed divide /2
LDA SHRVDUQ,X
STA A1L ; Result in A1L/H
* Y-coordinate in SHRVDUQ+7,+8 1024*25/128=200
LDA SHRVDUQ+2,X
BMI :MINUS
ASL ; *2
ADC SHRVDUQ+2,X ; *3
ASL ; *6
ASL ; *12
ASL ; *24
ADC SHRVDUQ+2,X ; *25
ASL ;
AND #$FF00 ; Mask bits
ADC #0 ; Add in carry (9th bit)
XBA ; Clever trick: fewer shifts
STA A2L ; Into A2L/H
RTS
MX %11 ; Following code is 8 bit again
* Validate graphics window parms & store if okay
* First 8 bytes of SHRVDUQ: left, bottom, right, top
SHRVDU24 >>> ENTMAIN
PHP ; Disable interrupts
SEI
CLC ; 65816 native mode
XCE
REP #$30 ; 16 bit M & X
MX %00 ; Tell Merlin
LDA SHRVDUQ+4 ; Right
CMP SHRVDUQ+0 ; Left
BCC :BAD ; right<left
CMP #1280 ; width
BCS :BAD ; right>=width
LDA SHRVDUQ+6 ; Top
CMP SHRVDUQ+2 ; Bottom
BCC :BAD ; top<bottom
CMP #1024 ; height
BCS :BAD ; top>=height
LDX #$00 ; Start of SHRVDUQ
JSR SHRCOORD2 ; Convert left, bottom
LDA A1L ; left converted
STA SHRWINLFT
LDA A2L ; bottom converted
STA SHRWINBTM
LDX #$04 ; 4 byte offset
JSR SHRCOORD2 ; Convert right, top
LDA A1L ; right converted
STA SHRWINRGT
LDA A2L ; top converted
STA SHRWINBTM
SEC ; 65816 emulation mode
XCE
PLP
>>> XF2AUX,VDU24RET
:BAD SEC ; 65816 emulation mode
XCE
PLP
>>> XF2AUX,VDU24RETBAD
* Table of addresses of SHR rows (in reverse order)
SHRROWSL DB <$9c60
DB <$9bc0