mirror of https://github.com/a2-4am/4cade.git
198 lines
3.8 KiB
Plaintext
198 lines
3.8 KiB
Plaintext
;license:MIT
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;(c) 2019 by 4am
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;
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!cpu 6502
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!to "build/FX.INDEXED/SOFT.L",plain
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*=$6000
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y = $fc
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row = $fd
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col = $fe
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counter = $ff
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!source "src/fx/macros.a"
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!source "src/constants.a"
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lda #(40+7-1) ; columns + blocks per row - 1
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sta counter
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lda #39
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sta col
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ColLoop
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lda #23
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sta row
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RowLoop
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; [speedopt] calculate HGR base addresses once per row
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lda row
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asl
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asl
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asl
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+HGR_CALC
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ldy col
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+IS_Y_OFFSCREEN
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bcs @block2
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; [speedopt] HGRBlockCopyWithMask but hardcoded for this block's masks
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ldx #7
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clc
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-
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+COPY_BIT $3c, $26, copymasks1
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+HGR_INC_WITHIN_BLOCK
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dex
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bpl -
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; [speedopt] reset HGR base addresses instead of recalculating them from scratch
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+RESET_HGR_CALC
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@block2
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iny
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+IS_Y_OFFSCREEN
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bcs @block3
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ldx #7
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clc
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-
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+COPY_BIT $3c, $26, copymasks2
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+HGR_INC_WITHIN_BLOCK
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dex
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bpl -
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+RESET_HGR_CALC
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@block3
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iny
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+IS_Y_OFFSCREEN
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bcs @block4
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ldx #7
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clc
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-
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+COPY_BIT $3c, $26, copymasks3
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+HGR_INC_WITHIN_BLOCK
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dex
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bpl -
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+RESET_HGR_CALC
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@block4
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iny
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+IS_Y_OFFSCREEN
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bcs @block5
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ldx #7
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clc
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-
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+COPY_BIT $3c, $26, copymasks4
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+HGR_INC_WITHIN_BLOCK
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dex
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bpl -
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+RESET_HGR_CALC
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@block5
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iny
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+IS_Y_OFFSCREEN
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bcs @block6
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ldx #7
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clc
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-
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+COPY_BIT $3c, $26, copymasks5
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+HGR_INC_WITHIN_BLOCK
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dex
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bpl -
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+RESET_HGR_CALC
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@block6
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iny
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+IS_Y_OFFSCREEN
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bcs @block7
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ldx #7
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clc
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-
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+COPY_BIT $3c, $26, copymasks6
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+HGR_INC_WITHIN_BLOCK
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dex
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bpl -
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+RESET_HGR_CALC
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@block7
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iny
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+IS_Y_OFFSCREEN
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bcs @nextrow
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; [speedopt] HGRBlockCopy but inlined
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ldx #7
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clc
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- lda ($3c),y
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sta ($26),y
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+HGR_INC_WITHIN_BLOCK
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dex
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bpl -
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; don't need RESET_HGR_CALC here because we're done with this row
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@nextrow
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dec row
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+LBPL RowLoop
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lda $c000
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bmi @exit
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dec col
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dec counter
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+LBNE ColLoop
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@exit rts
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copymasks1
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!byte %10000000
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!byte %10000000
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!byte %10000000
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!byte %10001000
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!byte %10001000
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!byte %10000000
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!byte %10000000
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!byte %10000000
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copymasks2
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!byte %10000000
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!byte %10000000
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!byte %10010100
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!byte %10001000
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!byte %10001000
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!byte %10010100
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!byte %10000000
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!byte %10000000
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copymasks3
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!byte %10000000
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!byte %10000000
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!byte %10011100
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!byte %10011100
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!byte %10011100
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!byte %10011100
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!byte %10000000
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!byte %10000000
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copymasks4
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!byte %10000000
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!byte %10101010
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!byte %10011100
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!byte %10111110
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!byte %10011100
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!byte %10011100
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!byte %10101010
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!byte %10000000
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copymasks5
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!byte %10000000
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!byte %10111110
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!byte %10111110
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!byte %10111110
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!byte %10111110
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!byte %10111110
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!byte %10111110
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!byte %10000000
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copymasks6
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!byte %11010101
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!byte %10111110
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!byte %11111111
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!byte %10111110
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!byte %11111111
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!byte %10111110
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!byte %10111110
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!byte %11010101
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!source "src/wait.a"
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