dos33fsprogs/demos/second/part12_plasma/do_plasma.s

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ArmAsm
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do_plasma:
; init
BP3:
; ============================================================================
; Precalculate some values (inlined)
; ROUTINES PRE CALCUL
; ============================================================================
;
; cycles = 30 + (40*53) -1 + 25 = 2174 cycles
precalc:
; 0
lda PARAM1 ; self modify various parts ; 3
sta pc_off1+1 ; 4
lda PARAM2 ; 3
sta pc_off2+1 ; 4
lda PARAM3 ; 3
sta pc_off3+1 ; 4
lda PARAM4 ; 3
sta pc_off4+1 ; 4
; 28
; Table1(X) = sin1(PARAM1+X)+sin2(PARAM1+X)
; Table2(X) = sin3(PARAM3+X)+sin1(PARAM4+X)
ldx #$28 ; 40 ; 2
; 30
precalc_loop:
pc_off1:
lda sin1 ; 4
pc_off2:
adc sin2 ; 4
sta Table1,X ; 4
; 12
pc_off3:
lda sin3 ; 4
pc_off4:
adc sin1 ; 4
sta Table2,X ; 4
; 24
inc pc_off1+1 ; 6
inc pc_off2+1 ; 6
inc pc_off3+1 ; 6
inc pc_off4+1 ; 6
; 48
dex ; 2
bpl precalc_loop ; 2/3
; 53
inc PARAM1 ; 5
inc PARAM1 ; 5
dec PARAM2 ; 5
inc PARAM3 ; 5
dec PARAM4 ; 5
; 25
; ============================================================================
; Display Routines
; ROUTINES AFFICHAGES
; ============================================================================
; 26+( 24*(11+(40*(39+(38*2))) = 110,690
; 26+( 24*(11+(40*(39+(38*4))) = 183,650
; 26+( 24*(11+(40*(39+(38*8))) = 329,570
; Display "Normal"
; AFFICHAGE "NORMAL"
display_normal:
ldx #23 ; lines 0-23 lignes 0-23 ; 2
display_line_loop:
; 0
lda hposn_low_div8,X ; setup line pointer ; 4
sta GBASL ; 3
; 7
ldy #39 ; col 0-39 ; 2
lda Table2,X ; setup base sine value for row ; 4
sta display_row_sin_smc+1 ; 4
; 17
display_col_loop:
lda Table1,Y ; load in column sine value ; 4
display_row_sin_smc:
adc #00 ; add in row value ; 2
sta display_lookup_smc+1 ; patch in low byte of lookup ; 4
; 8
; pick 0/1 for odd even
lda display_lookup_smc+2 ; 4
eor #$01 ; 2
sta display_lookup_smc+2 ; 4
; 18
; lda hires_colors_even_l0 ; attention: must be aligned
; sta color_smc+1
lda hposn_high_div8,X ; 4
clc ; 2
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adc DRAW_PAGE ; 3
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sta GBASH ; 3
; 30
lda #1 ; 2
sta COUNT ; 3
; 35
store_loop:
color_smc:
lda display_lookup_smc+2 ; 4
eor #$02 ; 2
sta display_lookup_smc+2 ; 4
; 10
display_lookup_smc:
lda hires_colors_even_l0 ; attention: must be aligned ; 4
; lda #$fe
sta (GBASL),Y ; 6
clc ; 2
lda #$10 ; 2
adc GBASH ; 3
sta GBASH ; 3
dec COUNT ; 5
bpl store_loop ; 2/3
; 38
dey ; 2
bpl display_col_loop ; 2/3
dex ; 2
bpl display_line_loop ; 2/3
; ============================================================================
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lda DRAW_PAGE ; 3
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beq was_page1 ; 2/3
was_page2:
bit PAGE2 ; 4
lda #0 ; 2
beq done_pageflip ; 2/3
was_page1:
bit PAGE1 ; 4
lda #$20 ; 2
done_pageflip:
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sta DRAW_PAGE ; 3
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plasma_end_smc:
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lda #52
jsr wait_for_pattern
bcc wasnt_keypress
jmp done_plasma
wasnt_keypress:
; 15?
inc COMPT1 ; 6
beq display_done2 ; 2/3
; bne BP3
jmp BP3 ; 3
display_done2:
dec COMPT2 ; 6
beq display_done ; 2/3
; bne BP3
jmp BP3 ; 3
display_done:
jmp do_plasma
; beq do_plasma ; bra
done_plasma:
bit KEYRESET
rts