dos33fsprogs/graphics/hgr/xdraw/tiny_tiny_tiny.s
2021-05-03 14:24:28 -04:00

71 lines
1.1 KiB
ArmAsm

; Tiny Tiny
; zero page locations
HGR_SHAPE = $1A
HGR_BITS = $1C
GBASL = $27
GBASH = $28
A5H = $45
XREG = $46
YREG = $47
; C0-CF should be clear
; D0-DF?? D0-D5 = HGR scratch?
HGR_DX = $D0 ; HGLIN
HGR_DX2 = $D1 ; HGLIN
HGR_DY = $D2 ; HGLIN
HGR_QUADRANT = $D3
HGR_E = $D4
HGR_E2 = $D5
HGR_X = $E0
HGR_X2 = $E1
HGR_Y = $E2
HGR_COLOR = $E4
HGR_HORIZ = $E5
HGR_SCALE = $E7
HGR_SHAPE = $E8
HGR_SHAPE2 = $E9
HGR_COLLISIONS = $EA
HGR_ROTATION = $F9
FRAME = $FC
XPOS = $FD
YPOS = $FF
; ROM calls
HGR2 = $F3D8
HPOSN = $F411
XDRAW0 = $F65D
RESTORE = $FF3F
.zeropage
tiny_tiny:
jsr HGR2 ; Hi-res, full screen ; 3
; Y=0, A=0 after this call
; lda #40
; sta HGR_SCALE
tiny_loop:
; setup X and Y co-ords
ldy #0 ; Y always 0
ldx #140
lda #96
jsr HPOSN ; X= (y,x) Y=(a)
; saves Y/X/A to HGR_Y, HGR_X, HGR_X+1
; ldx #<shape_table ; point to our shape
; ldy #0
rot_smc:
lda #0 ; ROT=0
jsr XDRAW1 ; XDRAW 1 AT X,Y
; Both A and X are 0 at exit
inc rot_smc+1
jmp tiny_loop
shape_table:
.byte $2D,0 ; shape data
; RT RT is 00 101 101 = 2D