mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-06-09 22:29:36 +00:00
295 lines
5.1 KiB
ArmAsm
295 lines
5.1 KiB
ArmAsm
; Not quite a raster-bar, but why not
|
|
|
|
.include "zp.inc"
|
|
|
|
;===========
|
|
; CONSTANTS
|
|
;===========
|
|
|
|
ELEMENTS EQU 64
|
|
NUM_ROWS EQU 20
|
|
|
|
;=====================
|
|
; Rasterbars
|
|
;=====================
|
|
|
|
;================================
|
|
; Clear screen and setup graphics
|
|
;================================
|
|
|
|
jsr clear_screens ; clear top/bottom of page 0/1
|
|
jsr set_gr_page0
|
|
|
|
|
|
;===============
|
|
; Init Variables
|
|
;===============
|
|
lda #0 ; 2
|
|
sta DRAW_PAGE ; 3
|
|
sta SCREEN_Y ; 3
|
|
|
|
;===========================
|
|
;===========================
|
|
; Main Loop
|
|
;===========================
|
|
;===========================
|
|
raster_loop:
|
|
|
|
jsr clear_top ; clear screen
|
|
|
|
; clear rows
|
|
|
|
ldy #(NUM_ROWS-1) ; 2
|
|
lda #0 ; 2
|
|
|
|
init_rows:
|
|
sta row_color,Y ; 5
|
|
dey ; 2
|
|
bpl init_rows ; 2nt/3
|
|
|
|
;================
|
|
; set colors
|
|
|
|
lda #COLOR_BOTH_AQUA ; aqua
|
|
ldy SCREEN_Y
|
|
jsr set_row_color
|
|
|
|
lda #COLOR_BOTH_MEDIUMBLUE ; medium blue
|
|
jsr set_row_color
|
|
|
|
lda #COLOR_BOTH_LIGHTGREEN ; light green
|
|
jsr set_row_color
|
|
|
|
lda #COLOR_BOTH_DARKGREEN ; green
|
|
jsr set_row_color
|
|
|
|
lda #COLOR_BOTH_YELLOW ; yellow
|
|
jsr set_row_color
|
|
|
|
lda #COLOR_BOTH_ORANGE ; orange
|
|
jsr set_row_color
|
|
|
|
lda #COLOR_BOTH_PINK ; pink
|
|
jsr set_row_color
|
|
|
|
lda #COLOR_BOTH_RED ; red
|
|
jsr set_row_color
|
|
|
|
;=================
|
|
; draw rows
|
|
|
|
ldy #(NUM_ROWS-1) ; 2
|
|
draw_rows_loop:
|
|
lda row_color,Y ; 5
|
|
beq draw_rows_skip ; skip if black ; 2nt/3
|
|
|
|
sta COLOR ; 3
|
|
|
|
|
|
tya ; 2
|
|
pha ; 3
|
|
asl ; 2
|
|
|
|
ldy #39 ; 2
|
|
sty V2 ; 3
|
|
ldy #0 ; 2
|
|
jsr hlin_double ; hlin y,V2 at A ; 63+(X*16)
|
|
pla ; 4
|
|
tay ; 2
|
|
draw_rows_skip:
|
|
dey ; 2
|
|
bpl draw_rows_loop ; 2
|
|
|
|
|
|
;==================
|
|
; flip pages
|
|
;==================
|
|
|
|
jsr page_flip ; 6
|
|
|
|
|
|
;==================
|
|
; delay?
|
|
;==================
|
|
|
|
lda #100
|
|
jsr WAIT
|
|
|
|
|
|
;==================
|
|
; update y pointer
|
|
;==================
|
|
ldy SCREEN_Y
|
|
iny
|
|
cpy #ELEMENTS
|
|
bne not_there
|
|
ldy #0
|
|
not_there:
|
|
sty SCREEN_Y
|
|
|
|
|
|
;==================
|
|
; loop forever
|
|
;==================
|
|
|
|
jmp raster_loop ; 3
|
|
|
|
|
|
;===================
|
|
;===================
|
|
; set_row_color
|
|
;===================
|
|
;===================
|
|
; color in A
|
|
; Y=offset
|
|
; Y incremented
|
|
; A, X trashed
|
|
|
|
set_row_color:
|
|
sta COLOR
|
|
tya ; wrap y offset
|
|
and #(ELEMENTS-1)
|
|
tax
|
|
|
|
lda fine_sine,X ; lookup sine value
|
|
; pre-shifted right by 4, sign-extended
|
|
|
|
clc
|
|
adc #18 ; add in 18 to center on screen
|
|
|
|
sin_no_more:
|
|
|
|
pha ; save row value
|
|
jsr put_color ; put color at row
|
|
pla ; restore row value
|
|
|
|
clc ; increment row value
|
|
adc #1
|
|
|
|
jsr put_color ; put color at row
|
|
|
|
iny ; increment for next time
|
|
|
|
rts
|
|
|
|
;==================
|
|
; put_color
|
|
;==================
|
|
; A = row to set color of
|
|
; A trashed
|
|
put_color:
|
|
clc
|
|
ror ; row/2, with even/odd in carry
|
|
tax ; put row/2 in X
|
|
|
|
bcc even_line ; if even, skip to even
|
|
odd_line:
|
|
lda #$f0 ; load mask for odd
|
|
bcs finish_line
|
|
even_line:
|
|
lda #$0f ; load mask for even
|
|
finish_line:
|
|
sta MASK
|
|
|
|
and COLOR ; mask off color
|
|
sta COLOR2 ; store for later
|
|
|
|
lda MASK
|
|
eor #$ff ; invert mask
|
|
and row_color,X ; load existing color
|
|
|
|
ora COLOR2 ; combine
|
|
sta row_color,X ; store back
|
|
|
|
rts
|
|
|
|
;===============================================
|
|
; External modules
|
|
;===============================================
|
|
|
|
.include "../asm_routines/pageflip.s"
|
|
.include "../asm_routines/gr_setpage.s"
|
|
.include "../asm_routines/gr_offsets.s"
|
|
.include "../asm_routines/gr_fast_clear.s"
|
|
.include "../asm_routines/gr_hlin.s"
|
|
|
|
;======================
|
|
; some arrays
|
|
;======================
|
|
|
|
row_color:
|
|
.byte $00,$00,$00,$00,$00, $00,$00,$00,$00,$00
|
|
.byte $00,$00,$00,$00,$00, $00,$00,$00,$00,$00
|
|
|
|
; arithmatically shifted right by 4
|
|
|
|
; FIXME: exploit symmetry and get rid of 3/4 of this table
|
|
; possibly not worth the extra code
|
|
fine_sine:
|
|
.byte $00 ; 0.000000
|
|
.byte $01 ; 0.098017
|
|
.byte $03 ; 0.195090
|
|
.byte $04 ; 0.290285
|
|
.byte $06 ; 0.382683
|
|
.byte $07 ; 0.471397
|
|
.byte $08 ; 0.555570
|
|
.byte $0A ; 0.634393
|
|
.byte $0B ; 0.707107
|
|
.byte $0C ; 0.773010
|
|
.byte $0D ; 0.831470
|
|
.byte $0E ; 0.881921
|
|
.byte $0E ; 0.923880
|
|
.byte $0F ; 0.956940
|
|
.byte $0F ; 0.980785
|
|
.byte $0F ; 0.995185
|
|
.byte $0F ; 1.000000
|
|
.byte $0F ; 0.995185
|
|
.byte $0F ; 0.980785
|
|
.byte $0F ; 0.956940
|
|
.byte $0E ; 0.923880
|
|
.byte $0E ; 0.881921
|
|
.byte $0D ; 0.831470
|
|
.byte $0C ; 0.773010
|
|
.byte $0B ; 0.707107
|
|
.byte $0A ; 0.634393
|
|
.byte $08 ; 0.555570
|
|
.byte $07 ; 0.471397
|
|
.byte $06 ; 0.382683
|
|
.byte $04 ; 0.290285
|
|
.byte $03 ; 0.195090
|
|
.byte $01 ; 0.098017
|
|
.byte $00 ; 0.000000
|
|
|
|
.byte $FE ; -0.098017
|
|
.byte $FC ; -0.195090
|
|
.byte $FB ; -0.290285
|
|
.byte $F9 ; -0.382683
|
|
.byte $F8 ; -0.471397
|
|
.byte $F7 ; -0.555570
|
|
.byte $F5 ; -0.634393
|
|
.byte $F4 ; -0.707107
|
|
.byte $F3 ; -0.773010
|
|
.byte $F2 ; -0.831470
|
|
.byte $F1 ; -0.881921
|
|
.byte $F1 ; -0.923880
|
|
.byte $F0 ; -0.956940
|
|
.byte $F0 ; -0.980785
|
|
.byte $F0 ; -0.995185
|
|
.byte $F0 ; -1.000000
|
|
.byte $F0 ; -0.995185
|
|
.byte $F0 ; -0.980785
|
|
.byte $F0 ; -0.956940
|
|
.byte $F1 ; -0.923880
|
|
.byte $F1 ; -0.881921
|
|
.byte $F2 ; -0.831470
|
|
.byte $F3 ; -0.773010
|
|
.byte $F4 ; -0.707107
|
|
.byte $F5 ; -0.634393
|
|
.byte $F7 ; -0.555570
|
|
.byte $F8 ; -0.471397
|
|
.byte $F9 ; -0.382683
|
|
.byte $FB ; -0.290285
|
|
.byte $FC ; -0.195090
|
|
.byte $FE ; -0.098017
|
|
|