172 lines
2.1 KiB
ArmAsm
172 lines
2.1 KiB
ArmAsm
texture = $1000
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high_lookup = $1100
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low_lookup = $1200
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;col = ( 8.0 + (sintable[xx&0xf])
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; + 8.0 + (sintable[yy&0xf])
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; ) / 2;
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init_plasma_texture:
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ldy #15
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plasma_create_yloop:
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ldx #15
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plasma_create_xloop:
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clc
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lda #15
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adc sinetable,X
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adc sinetable,Y
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lsr
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plasma_lookup_smc:
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sta texture ; always starts at $d00
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inc plasma_lookup_smc+1
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dex
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bpl plasma_create_xloop
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dey
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bpl plasma_create_yloop
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rts
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;==============================
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; update plasma
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update_plasma:
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plasma_cycle_colors:
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; cycle colors
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ldx #0
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cycle_texture_loop:
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inc texture,X
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lda texture,X ; slow here but faster than doing it
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and #$f ; in the draw routine
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sta texture,X
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inx
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bne cycle_texture_loop
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; make lookup
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ldx #0
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cycle_lookup_loop:
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lda texture,X
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lsr
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tay
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color_lookup_smc:
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lda green_lookup,Y
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pha
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and #$f0
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sta high_lookup,X
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pla
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and #$0f
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sta low_lookup,X
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inx
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bne cycle_lookup_loop
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rts
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.if 0
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plot_frame:
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; plot frame
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ldx #47 ; YY=0
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plot_yloop:
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txa ; get (y&0xf)<<4
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pha ; save YY
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asl
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asl
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asl
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asl
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sta CTEMP
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txa
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lsr
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ldy #$0f ; setup mask
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bcc plot_mask
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ldy #$f0
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plot_mask:
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sty MASK
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jsr GBASCALC ; point GBASL/H to address in A
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; after, A trashed, C is clear
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;==========
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ldy #39 ; XX = 39 (countdown)
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plot_xloop:
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tya ; get x&0xf
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and #$f
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ora CTEMP ; get ((y&0xf)*16)+x
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tax
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plot_lookup:
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; sta plot_lookup_smc+1
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plot_lookup_smc:
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lda lookup,X ; load lookup, (y*16)+x
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; lda lookup ; load lookup, (y*16)+x
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and #$f
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lsr
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tax
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lda colorlookup,X
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sta COLOR
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jsr PLOT1 ; plot at GBASL,Y (x co-ord in Y)
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dey
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bpl plot_xloop
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pla
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tax ; restore YY
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dex
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bpl plot_yloop
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bmi forever_loop
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.endif
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which_color: .byte $0
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colorlookup:
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.word green_lookup,yellow_lookup,blue_lookup,red_lookup
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; blue
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blue_lookup:
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.byte $55,$22,$66,$77,$ff,$77,$55,$00
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; red
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red_lookup:
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.byte $55,$11,$33,$bb,$ff,$bb,$55,$00
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; green
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green_lookup:
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.byte $55,$44,$cc,$ee,$ff,$ee,$55,$00
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; yellow
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yellow_lookup:
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.byte $55,$88,$99,$dd,$ff,$dd,$55,$00
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sinetable:
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.byte $00,$03,$05,$07,$08,$07,$05,$03
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.byte $00,$FD,$FB,$F9,$F8,$F9,$FB,$FD
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