mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-13 04:05:15 +00:00
300 lines
6.3 KiB
ArmAsm
300 lines
6.3 KiB
ArmAsm
; Not quite a raster-bar, but why not
|
|
|
|
|
|
; OPTIMIZATION (as originally it was 16,200 instructions, a bit much
|
|
; for a max 20,000 cycle interrupt handler)
|
|
|
|
; -120 : Unroll the zero loop, saved 120 cycles
|
|
; -5000 : Inline the vlin_double code
|
|
|
|
;===========
|
|
; CONSTANTS
|
|
;===========
|
|
|
|
ELEMENTS EQU 64
|
|
NUM_ROWS EQU 20
|
|
|
|
;=====================
|
|
; Rasterbars
|
|
;=====================
|
|
|
|
;===========================
|
|
;===========================
|
|
; Main Loop
|
|
;===========================
|
|
;===========================
|
|
draw_rasters:
|
|
|
|
; clear rows
|
|
|
|
; ldy #(NUM_ROWS-1) ; 2
|
|
lda #0 ; 2
|
|
init_rows:
|
|
sta row_color+0 ; 4
|
|
sta row_color+1
|
|
sta row_color+2
|
|
sta row_color+3
|
|
sta row_color+4
|
|
sta row_color+5
|
|
sta row_color+6
|
|
sta row_color+7
|
|
sta row_color+8
|
|
sta row_color+9
|
|
sta row_color+10
|
|
sta row_color+11
|
|
sta row_color+12
|
|
sta row_color+13
|
|
sta row_color+14
|
|
sta row_color+15
|
|
sta row_color+16
|
|
sta row_color+17
|
|
sta row_color+18
|
|
sta row_color+19
|
|
|
|
|
|
|
|
|
|
; sta row_color,Y ; 5
|
|
; dey ; 2
|
|
; bpl init_rows ; 2nt/3
|
|
;==============
|
|
; Originally 4+20*10 = 204 cyles / 10 bytes
|
|
; now 2+4*20 = 82 cycles / 62 bytes
|
|
|
|
;================
|
|
; set colors
|
|
|
|
ldy SCREEN_Y ; 3
|
|
|
|
lda #COLOR_BOTH_DARKBLUE ; d. blue ; 2
|
|
jsr set_row_color ; 6+136
|
|
|
|
lda #COLOR_BOTH_MEDIUMBLUE ; m.blue ; 2
|
|
jsr set_row_color ; 6+136
|
|
|
|
lda #COLOR_BOTH_AQUA ; aqua ; 2
|
|
jsr set_row_color ; 6+136
|
|
|
|
lda #COLOR_BOTH_PINK ; pink ; 2
|
|
jsr set_row_color ; 6+136
|
|
|
|
lda #COLOR_BOTH_RED ; red ; 2
|
|
jsr set_row_color ; 6+136
|
|
|
|
;==============
|
|
; new = 5 * 142 = 710
|
|
; original = 1152
|
|
|
|
;=================
|
|
; 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
|
|
|
|
sty TEMPY ; 3
|
|
tya ; y*2 ; 2
|
|
asl ; 2
|
|
tay ; 2
|
|
|
|
; hlin_setup inlined
|
|
|
|
lda gr_offsets,Y ; lookup low-res memory address ; 4
|
|
sta GBASL ; 3
|
|
iny ; 2
|
|
lda gr_offsets,Y ; 4
|
|
clc ; 2
|
|
adc DRAW_PAGE ; add in draw page offset ; 3
|
|
sta GBASH ; 3
|
|
|
|
ldy #39 ; 2
|
|
lda COLOR ; 3
|
|
double_loop:
|
|
sta (GBASL),Y ; 6
|
|
dey ; 2
|
|
bpl double_loop ; 2nt/3
|
|
|
|
ldy TEMPY ; 3
|
|
|
|
draw_rows_skip:
|
|
dey ; 2
|
|
bpl draw_rows_loop ; 3/2nt
|
|
|
|
;==============================
|
|
; Original: 20 * 741 = 14,820
|
|
; new = 2+ 20*(53+11*40)=9862
|
|
; (note, worst case)
|
|
;==================
|
|
; update y pointer
|
|
;==================
|
|
ldy SCREEN_Y ; 3
|
|
iny ; 2
|
|
cpy #ELEMENTS ; 2
|
|
bne not_there ; 3/2nt
|
|
ldy #0 ; 2
|
|
not_there:
|
|
sty SCREEN_Y ; 3
|
|
|
|
rts ; 6
|
|
|
|
;===========
|
|
; 24
|
|
|
|
;=====================================
|
|
; original total= 16,200
|
|
; new total (worst case)= 10,678
|
|
; (realistic) = 5,748
|
|
|
|
;===================
|
|
;===================
|
|
; set_row_color
|
|
;===================
|
|
;===================
|
|
; color in A
|
|
; Y=offset
|
|
; Y incremented
|
|
; A, X trashed
|
|
|
|
set_row_color:
|
|
sta COLOR ; 3
|
|
tya ; wrap y offset ; 2
|
|
and #(ELEMENTS-1) ; 2
|
|
tax ; 2
|
|
|
|
lda fine_sine,X ; lookup sine value ; 4
|
|
; pre-shifted right by 4, sign-extended
|
|
; 18 added to center
|
|
|
|
sin_no_more:
|
|
|
|
pha ; save row value ; 3
|
|
jsr put_color ; put color at row ; 6+44
|
|
pla ; restore row value ; 4
|
|
|
|
clc ; increment row value ; 2
|
|
adc #1 ; 2
|
|
|
|
jsr put_color ; put color at row ; 6+44
|
|
|
|
iny ; increment for next time ; 2
|
|
|
|
rts ; 6
|
|
;=============
|
|
; 132
|
|
|
|
;==================
|
|
; put_color
|
|
;==================
|
|
; A = row to set color of
|
|
; A trashed
|
|
put_color:
|
|
clc ; 2
|
|
ror ; row/2, with even/odd in carry ; 2
|
|
tax ; put row/2 in X ; 2
|
|
|
|
bcc even_line ; if even, skip to even ; 2nt/3
|
|
odd_line:
|
|
lda #$f0 ; load mask for odd ; 2
|
|
bcs finish_line ; 2nt/3
|
|
even_line:
|
|
lda #$0f ; load mask for even ; 2
|
|
finish_line:
|
|
sta MASK ; 3
|
|
|
|
and COLOR ; mask off color ; 3
|
|
sta COLOR2 ; store for later ; 3
|
|
|
|
lda MASK ; 3
|
|
eor #$ff ; invert mask ; 2
|
|
and row_color,X ; load existing color ; 4
|
|
|
|
ora COLOR2 ; combine ; 3
|
|
sta row_color,X ; store back ; 5
|
|
|
|
rts ; 6
|
|
|
|
;===========
|
|
; 44
|
|
;======================
|
|
; 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, sign extended, added 18 to center
|
|
|
|
; FIXME: exploit symmetry and get rid of 3/4 of this table
|
|
; possibly not worth the extra code
|
|
fine_sine:
|
|
.byte $00+18 ; 0.000000
|
|
.byte $01+18 ; 0.098017
|
|
.byte $03+18 ; 0.195090
|
|
.byte $04+18 ; 0.290285
|
|
.byte $06+18 ; 0.382683
|
|
.byte $07+18 ; 0.471397
|
|
.byte $08+18 ; 0.555570
|
|
.byte $0A+18 ; 0.634393
|
|
.byte $0B+18 ; 0.707107
|
|
.byte $0C+18 ; 0.773010
|
|
.byte $0D+18 ; 0.831470
|
|
.byte $0E+18 ; 0.881921
|
|
.byte $0E+18 ; 0.923880
|
|
.byte $0F+18 ; 0.956940
|
|
.byte $0F+18 ; 0.980785
|
|
.byte $0F+18 ; 0.995185
|
|
.byte $0F+18 ; 1.000000
|
|
.byte $0F+18 ; 0.995185
|
|
.byte $0F+18 ; 0.980785
|
|
.byte $0F+18 ; 0.956940
|
|
.byte $0E+18 ; 0.923880
|
|
.byte $0E+18 ; 0.881921
|
|
.byte $0D+18 ; 0.831470
|
|
.byte $0C+18 ; 0.773010
|
|
.byte $0B+18 ; 0.707107
|
|
.byte $0A+18 ; 0.634393
|
|
.byte $08+18 ; 0.555570
|
|
.byte $07+18 ; 0.471397
|
|
.byte $06+18 ; 0.382683
|
|
.byte $04+18 ; 0.290285
|
|
.byte $03+18 ; 0.195090
|
|
.byte $01+18 ; 0.098017
|
|
.byte $00+18 ; 0.000000
|
|
|
|
.byte ($FE+18)&$ff ; -0.098017
|
|
.byte ($FC+18)&$ff ; -0.195090
|
|
.byte ($FB+18)&$ff ; -0.290285
|
|
.byte ($F9+18)&$ff ; -0.382683
|
|
.byte ($F8+18)&$ff ; -0.471397
|
|
.byte ($F7+18)&$ff ; -0.555570
|
|
.byte ($F5+18)&$ff ; -0.634393
|
|
.byte ($F4+18)&$ff ; -0.707107
|
|
.byte ($F3+18)&$ff ; -0.773010
|
|
.byte ($F2+18)&$ff ; -0.831470
|
|
.byte ($F1+18)&$ff ; -0.881921
|
|
.byte ($F1+18)&$ff ; -0.923880
|
|
.byte ($F0+18)&$ff ; -0.956940
|
|
.byte ($F0+18)&$ff ; -0.980785
|
|
.byte ($F0+18)&$ff ; -0.995185
|
|
.byte ($F0+18)&$ff ; -1.000000
|
|
.byte ($F0+18)&$ff ; -0.995185
|
|
.byte ($F0+18)&$ff ; -0.980785
|
|
.byte ($F0+18)&$ff ; -0.956940
|
|
.byte ($F1+18)&$ff ; -0.923880
|
|
.byte ($F1+18)&$ff ; -0.881921
|
|
.byte ($F2+18)&$ff ; -0.831470
|
|
.byte ($F3+18)&$ff ; -0.773010
|
|
.byte ($F4+18)&$ff ; -0.707107
|
|
.byte ($F5+18)&$ff ; -0.634393
|
|
.byte ($F7+18)&$ff ; -0.555570
|
|
.byte ($F8+18)&$ff ; -0.471397
|
|
.byte ($F9+18)&$ff ; -0.382683
|
|
.byte ($FB+18)&$ff ; -0.290285
|
|
.byte ($FC+18)&$ff ; -0.195090
|
|
.byte ($FE+18)&$ff ; -0.098017
|
|
|