Apple-2-SW
/
Applecorn
mirror of https://github.com/bobbimanners/Applecorn.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Unrolled loop for faster SHR mode plotting. Thx John Brooks :)

This commit is contained in:
Bobbi Webber-Manners 2022-12-26 21:22:32 -05:00
parent 986d8aa1fc
commit 633b13175b
2 changed files with 24 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

BIN
applecorn.po
View File

Binary file not shown.

43
auxmem.shr.s
View File

@ -265,25 +265,30 @@ SHRPRCHAR SEC
LDA #$E1
STA VDUBANK2
JSR SHRCHARADDR ; Screen addr in VDUADDR
LDX #$00 ; First row of char
:L1 LDY #$00
LDA [VDUADDR2] ; Load exploded font data 1st byte
JSR SHRCOLBYTE
STA [VDUADDR] ; Store on screen
INY
INC VDUADDR2+0 ; Increment exploded font ptr
BNE :S1
INC VDUADDR2+1
:S1 LDA [VDUADDR2] ; Load exploded font data 2nd byte
JSR SHRCOLBYTE
STA [VDUADDR],Y ; Store on screen
INC VDUADDR2+0 ; Increment exploded font ptr
BNE :S2
INC VDUADDR2+1
:S2 JSR SHRNEXTROW ; Add 160 to VDUADDR
INX ; Next row of font
CPX #$08 ; Last row?
BNE :L1
* 65816 code contributed by John Brooks follows ...
PHB ; Save data bank
LDA VDUADDR2+2 ; Push font Bank onto stack
PHA
PLB ; Set data bank to font bank
CLC
XCE
REP #$30
LDY VDUADDR2 ; Font src ptr
LDX VDUADDR ; SHR dst ptr
SrcFont = $000000
DstShr = $E10000
LUP 8
LDA !SrcFont,Y
STAL DstShr,X
SrcFont = SrcFont+2
DstShr = DstShr+160
--^
PLB
SEC
XCE
MX %11
RTS