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SHR: inline coord conversion using macro

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Bobbi Webber-Manners 2023-01-07 21:38:10 -05:00
parent e18df1d337
commit f6f6c20c37
2 changed files with 15 additions and 13 deletions
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applecorn.po
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mainmem.shr.s
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@ -24,13 +24,15 @@ SHRGFXFGMSK2 DB $00 ; Copy of foreground colour mask
SHRGFXBGMASK DB $00 ; Background colour mask
SHRGFXACTION DB $00 ; GCOL action for point plotting
* These are all persistent locals
* These are all persistent locals (14 bytes of ZP)
SHRXPIXEL EQU SHRZP+0 ; Prev point in screen coords (word)
SHRYPIXEL EQU SHRZP+2 ; Prev point in screen coords (word)
SHRWINLFT EQU SHRZP+4 ; Gfx window - left (0-639) (word)
SHRWINRGT EQU SHRZP+6 ; Gfx window - right (0-639) (word)
SHRWINTOP EQU SHRZP+8 ; Gfx window - top (0-199) (word)
SHRWINBTM EQU SHRZP+10 ; Gfx window - bottom (0-199) (word)
SHRWINLFT EQU SHRZP+4 ; Gfx win - left (0-639) (word)
SHRWINRGT EQU SHRZP+6 ; Gfx win - right (0-639) (word)
SHRWINTOP EQU SHRZP+8 ; Gfx win - top (0-199) (word)
SHRWINBTM EQU SHRZP+10 ; Gfx win - bottom (0-199) (word)
SHRCURROUT EQU SHRZP+12 ; Curr pt in/out gfx win (byte)
SHRPREVOUT EQU SHRZP+13 ; Prev pt in/out gfx win (byte)
* Explode font to generate SHRFONTXPLD table
@ -231,7 +233,7 @@ SHRCHAR640 PHY ; Preserve Y
* Note: abs/rel handled in auxmem.vdu.s
* TODO: No triangle filling or other fancy ops yet
SHRPLOT >>> ENTMAIN
JSR SHRCOORD ; Convert coordinates
>>> SHRCOORD ; Convert coordinates
LDA A1L ; Preserve converted x
PHA
LDA A1H
@ -676,10 +678,11 @@ SHRLINEHI MX %00 ; Tell Merlin 16 bit M & X
:LIM EQU TMPZP+10 ; x1 gets stashed here
* Convert high-resolution screen coordinates
* Macro to convert high-resolution screen coordinates
* from 1280x1024 to 640x200 or 320x200
* On return: X-coordinate in A1L/H, Y-coordinate in A2L (A2H=0)
SHRCOORD PHP ; Disable interrupts
SHRCOORD MAC
PHP ; Disable interrupts
SEI
CLC ; 65816 native mode
XCE
@ -695,7 +698,7 @@ SHRCOORD PHP ; Disable interrupts
* Y-coordinate in SHRVDUQ+7,+8 1024*25/128=200
LDA SHRVDUQ+7
BMI :MINUS
BMI SHRCOORDNEG
ASL ; *2
ADC SHRVDUQ+7 ; *3
ASL ; *6
@ -721,9 +724,9 @@ SHRCOORD PHP ; Disable interrupts
XCE
MX %11 ; Tell Merlin
PLP ; Normal service resumed
RTS
BRA SHRCOORDEND
:MINUS MX %00 ; Tell Merlin we are 16 bit
SHRCOORDNEG MX %00 ; Tell Merlin we are 16 bit
EOR #$FFFF ; Negate
INC A
ASL ; *2
@ -753,7 +756,7 @@ SHRCOORD PHP ; Disable interrupts
XCE
MX %11 ; Tell Merlin
PLP ; Normal service resumed
RTS
SHRCOORDEND EOM
* Another coordinate transform, used by VDU25
@ -772,7 +775,6 @@ SHRCOORD2 MX $00 ; Tell Merlin it's 16 bit
* 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