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63 lines
1.3 KiB
Plaintext
63 lines
1.3 KiB
Plaintext
;license:MIT
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;(c) 2021 by 4am
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!cpu 6502
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!to "build/FX.INDEXED/SHR.DIAGONAL",plain
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*=$A000
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shrlo = $301 ; $C8 bytes, indexed as shrlo-1,x
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shrhi = $201 ; $C8 bytes, indexed as shrhi-1,x
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!source "src/fx/macros.a"
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+COPY_TO_0 start, end
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+BUILD_SHR_LOOKUP_TABLES shrlo, shrhi
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;X=0
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+COPY_SCB_AND_PALETTES
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;WRITEAUXMEM active
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jmp colloop
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start
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!pseudopc 0 {
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colloop
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ldx #$C8
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startcollo=*+1
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ldy #$9F ; SMC
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startcolhi=*+1
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lda #$00
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sta <colhi
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rowloop
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colhi=*+1
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lda #$00
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bne +
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cpy #$A0
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bcs +
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lda shrlo-1, x
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sta <dst+1
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lda shrhi-1, x
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sta <dst+2
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lda (<dst+1), y
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dst sta $FDFD, y ; SMC
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+ iny
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bne +
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inc <colhi
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+ dex
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bne rowloop
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dec <startcollo
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lda <startcollo
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cmp #$FF
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bne +
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dec <startcolhi
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+ lda $C000
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bmi exit
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dec <counter
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bne colloop
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dec <counter+1
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bne colloop
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exit
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rts
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counter !word 200 + 160 + 256
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}
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end
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