mirror of
https://github.com/deater/dos33fsprogs.git
synced 2025-03-13 03:38:14 +00:00
autumn: comment code
This commit is contained in:
Vince Weaver
parent
275a8a622e
commit
02fe35ae9e
278
autumn/autumn.s
278
autumn/autumn.s
@ -1,12 +1,7 @@
|
||||
; Autumn, based on the code in Hellmood's Autumn
|
||||
|
||||
; by deater (Vince Weaver) <vince@deater.net>
|
||||
|
||||
; Zero Page
|
||||
BASL = $28
|
||||
BASH = $29
|
||||
H2 = $2C
|
||||
;COLOR = $30
|
||||
; Zero Page Addresses
|
||||
|
||||
XCOORDL = $F0
|
||||
XCOORDH = $F1
|
||||
@ -19,155 +14,194 @@ EBP4 = $F7
|
||||
COLORL = $F8
|
||||
COLORH = $F9
|
||||
|
||||
TEMP = $FA
|
||||
TEMPY = $FB
|
||||
FRAME = $FC
|
||||
TEMPX = $FD
|
||||
|
||||
|
||||
; Soft Switches
|
||||
KEYPRESS= $C000
|
||||
KEYRESET= $C010
|
||||
SET_GR = $C050 ; Enable graphics
|
||||
FULLGR = $C052 ; Full screen, no text
|
||||
PAGE0 = $C054 ; Page0
|
||||
PAGE1 = $C055 ; Page1
|
||||
LORES = $C056 ; Enable LORES graphics
|
||||
|
||||
; ROM routines
|
||||
; Some of these are in the Applesoft ROMs so need at least an Apple II+
|
||||
; or later to run
|
||||
|
||||
PLOT = $F800 ; plot, horiz=y, vert=A (A trashed, XY Saved)
|
||||
SETCOL = $F864
|
||||
TEXT = $FB36 ;; Set text mode
|
||||
BASCALC = $FBC1
|
||||
SETGR = $FB40
|
||||
HOME = $FC58 ;; Clear the text screen
|
||||
WAIT = $FCA8 ;; delay 1/2(26+27A+5A^2) us
|
||||
HLINE = $F819
|
||||
TEXT = $FB36 ; Set text mode
|
||||
HGR2 = $F3D8 ; Set full-screen hi-res mode using page 2 ($4000)
|
||||
; 280x192 6-colors
|
||||
HPLOT0 = $F457 ; Plot point, (Y,X) = Horizontal, (A=Vertical)
|
||||
HCOLOR = $F6EC ; Set color in X, must be 0..7
|
||||
|
||||
HGR2 = $F3D8
|
||||
HPLOT0 = $F457 ; (Y,X) = Horizontal, (A=Vertical)
|
||||
HCOLOR = $F6EC ; color in x, must be 0..7
|
||||
|
||||
autumn:
|
||||
|
||||
;===================
|
||||
; init screen
|
||||
jsr HGR2 ; 3
|
||||
ldx #0
|
||||
stx XCOORDL
|
||||
stx YCOORDL
|
||||
stx XCOORDH
|
||||
stx YCOORDH
|
||||
stx EBP1
|
||||
stx EBP2
|
||||
stx EBP3
|
||||
stx EBP4
|
||||
stx COLORH
|
||||
; init screen ; Instruction Length
|
||||
jsr HGR2 ; 3
|
||||
|
||||
lda #$4f
|
||||
sta COLORL
|
||||
; init vars to zero. Apple II doesn't clear RAM
|
||||
; some of these might not be necessary
|
||||
; should make this a loop
|
||||
ldx #0 ; 2
|
||||
stx XCOORDL ; 2
|
||||
stx YCOORDL ; 2
|
||||
stx XCOORDH ; 2
|
||||
stx YCOORDH ; 2
|
||||
stx EBP1 ; 2
|
||||
stx EBP2 ; 2
|
||||
stx EBP3 ; 2
|
||||
stx EBP4 ; 2
|
||||
stx COLORH ; 2
|
||||
|
||||
; not necessary? on x86 is probably the
|
||||
; result of the VESA BIOS call
|
||||
; lda #$4f
|
||||
; sta COLORL
|
||||
|
||||
autumn_forever:
|
||||
|
||||
clc
|
||||
rol COLORL ; shl %ax
|
||||
rol COLORH
|
||||
; 16-bit shift of color
|
||||
; 2nd is a rotate as asl doesn't shift in cary
|
||||
asl COLORL ; 2 ; shl %ax
|
||||
rol COLORH ; 2
|
||||
|
||||
ldx XCOORDL
|
||||
ldy XCOORDH ; save old X
|
||||
; put old X value to X/Y
|
||||
; push/pop is 1 byte each but have to get
|
||||
; value into accumulator first
|
||||
ldx XCOORDL ; 2
|
||||
ldy XCOORDH ; 2
|
||||
|
||||
sec
|
||||
lda XCOORDL
|
||||
sbc YCOORDL ; X=X-Y
|
||||
sta XCOORDL
|
||||
lda XCOORDH
|
||||
sbc YCOORDH
|
||||
sta XCOORDH
|
||||
; 16-bit subtraction x=x-y
|
||||
; need to set carry before subtraction on 6502
|
||||
sec ; 1
|
||||
lda XCOORDL ; 2
|
||||
sbc YCOORDL ; 2
|
||||
sta XCOORDL ; 2
|
||||
lda XCOORDH ; 2
|
||||
sbc YCOORDH ; 2
|
||||
sta XCOORDH ; 2
|
||||
|
||||
cmp #$80
|
||||
ror XCOORDH ; asr X
|
||||
ror XCOORDL
|
||||
; 16-bit arithmatic shift right of X
|
||||
; 6502 has no asr instruction
|
||||
; cmp #$80 sets carry if high bit set
|
||||
cmp #$80 ; 2
|
||||
ror XCOORDH ; 2
|
||||
ror XCOORDL ; 2
|
||||
|
||||
clc
|
||||
txa
|
||||
adc YCOORDL ; y=y+oldx
|
||||
sta YCOORDL
|
||||
tya
|
||||
adc YCOORDH
|
||||
sta YCOORDH
|
||||
; 16-bit add, y=y+oldx
|
||||
clc ; 1
|
||||
txa ; 1
|
||||
adc YCOORDL ; 2
|
||||
sta YCOORDL ; 2
|
||||
tya ; 2
|
||||
adc YCOORDH ; 2
|
||||
sta YCOORDH ; 2
|
||||
|
||||
cmp #$80
|
||||
ror YCOORDH ; asr Y
|
||||
ror YCOORDL
|
||||
; 16-bit arithmatic shift right of y-coord
|
||||
cmp #$80 ; 2
|
||||
ror YCOORDH ; 2
|
||||
ror YCOORDL ; 2
|
||||
|
||||
; 32 bit rotate of low bit of Y
|
||||
ror EBP1
|
||||
ror EBP2
|
||||
ror EBP3
|
||||
ror EBP4 ; ror bottom bit of Y through 32 bits
|
||||
; 32 bit rotate of low bit shifted out of Y-coordinate
|
||||
ror EBP1 ; 2
|
||||
ror EBP2 ; 2
|
||||
ror EBP3 ; 2
|
||||
ror EBP4 ; 2
|
||||
|
||||
bcs label_11f
|
||||
; branch if carry set
|
||||
bcs label_11f ; 2
|
||||
|
||||
clc
|
||||
lda COLORL
|
||||
adc #1
|
||||
sta COLORL
|
||||
lda COLORH
|
||||
adc #0
|
||||
sta COLORH
|
||||
; 16-bit increment of color
|
||||
; no need to clear carry as we wouldn't be
|
||||
; here if it wasn't
|
||||
inc COLORL ; 2
|
||||
bne no_oflo ; 2
|
||||
inc COLORH ; 2
|
||||
no_oflo:
|
||||
|
||||
clc
|
||||
lda XCOORDL
|
||||
adc #$80
|
||||
sta XCOORDL ; X+=0x80
|
||||
lda XCOORDH
|
||||
adc #$0
|
||||
sta XCOORDH
|
||||
; 16-bit add of X-coord by 0x80
|
||||
; this keeps the drawing roughly to the 280x192 screen
|
||||
; carry should still be clear (inc doesn't set it)
|
||||
lda XCOORDL ; 2
|
||||
adc #$80 ; 2
|
||||
sta XCOORDL ; 2
|
||||
lda XCOORDH ; 2
|
||||
adc #$0 ; 2
|
||||
sta XCOORDH ; 2
|
||||
|
||||
sec
|
||||
lda YCOORDL
|
||||
eor #$FF
|
||||
adc #$0 ; Y=-Y
|
||||
sta YCOORDL
|
||||
lda YCOORDH
|
||||
eor #$FF
|
||||
adc #$0
|
||||
sta YCOORDH
|
||||
; 16-bit negate of Y-coord
|
||||
sec ; 1
|
||||
lda YCOORDL ; 2
|
||||
eor #$FF ; 2
|
||||
adc #$0 ; 2
|
||||
sta YCOORDL ; 2
|
||||
lda YCOORDH ; 2
|
||||
eor #$FF ; 2
|
||||
adc #$0 ; 2
|
||||
sta YCOORDH ; 2
|
||||
|
||||
label_11f:
|
||||
|
||||
; lda COLOR
|
||||
; and #$fc
|
||||
; eor #$12
|
||||
; sta COLOR
|
||||
; skipping the color manipulation done here by original
|
||||
|
||||
lda YCOORDH
|
||||
bmi autumn_forever ; if negative, loop
|
||||
; if ycoord negative, loop
|
||||
lda YCOORDH ; 2
|
||||
bmi autumn_forever ; 2
|
||||
|
||||
; if top bits of xcoord, loop
|
||||
lda XCOORDH ; 2
|
||||
and #$f0 ; 2
|
||||
bne autumn_forever ; 2
|
||||
|
||||
lda XCOORDH
|
||||
and #$f0
|
||||
bne autumn_forever
|
||||
|
||||
put_pixel:
|
||||
lda COLORL
|
||||
and #$7
|
||||
beq black1
|
||||
cmp #$4
|
||||
bne not_black2
|
||||
lda #$5
|
||||
bne not_black2
|
||||
black1:
|
||||
lda #$1
|
||||
; get color mapping
|
||||
; using lookup table for now whil trying to find best
|
||||
lda COLORL ; 2
|
||||
and #$7 ; 2
|
||||
tay ; 1
|
||||
ldx color_lookup,Y ; 3 (could be 2 if we had in zero page)
|
||||
|
||||
not_black2:
|
||||
tax
|
||||
jsr HCOLOR
|
||||
; actually set the color
|
||||
jsr HCOLOR ; 3
|
||||
|
||||
ldx XCOORDL
|
||||
ldy XCOORDH
|
||||
lda YCOORDL
|
||||
jsr HPLOT0
|
||||
; set up paramaters for HPLOT call
|
||||
ldx XCOORDL ; 2
|
||||
ldy XCOORDH ; 2
|
||||
lda YCOORDL ; 2
|
||||
jsr HPLOT0 ; 3
|
||||
|
||||
jmp autumn_forever ; 3
|
||||
lda KEYPRESS ; 3 ; see if key pressed
|
||||
; bpl autumn_forever ; loop if not
|
||||
|
||||
bmi exit_to_prompt ; 2 ; jump target too far away
|
||||
jmp autumn_forever ; 3 ; if we get under 128 bytes
|
||||
; can use the smaller jump
|
||||
|
||||
exit_to_prompt:
|
||||
jsr TEXT ; 3 ; return to text mode
|
||||
jmp $3D0 ; 3 ; return to Applesoft prompt
|
||||
|
||||
|
||||
; Apple II Hi-Res Colors
|
||||
; It's all NTSC artifacting and complex
|
||||
; There can be color-class at a 3.5 pixel level
|
||||
; And adjacent on pixels make white, adjacent off make black
|
||||
; Simplistic summary, you can have these 8 colors (6 unique)
|
||||
; 0 = Black0
|
||||
; 1 = Green
|
||||
; 2 = Purple
|
||||
; 3 = White0
|
||||
; 4 = Black1
|
||||
; 5 = Orange
|
||||
; 6 = Blue
|
||||
; 7 = White2
|
||||
|
||||
color_lookup:
|
||||
|
||||
; my default, colorful palette
|
||||
; .byte $01,$01,$02,$03, $05,$05,$06,$07
|
||||
|
||||
|
||||
; orange and gren palette
|
||||
.byte $01,$01,$03,$05, $05,$05,$01,$07
|
||||
|
||||
|
||||
; "Leaves"
|
||||
; TOP-LEFT ?? CENTER-TOP TOP-RIGHT LEFT ?? CENTER-BOTTOM ??
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user