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rotozoom: minor optimization
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parent
18892d4804
commit
74ea0a13b9
@ -1,10 +1,16 @@
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c00_scrn_offsets_l:
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common_offsets_l:
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.byte <$c00,<$c80,<$d00,<$d80,<$e00,<$e80,<$f00,<$f80
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.byte <$c00,<$c80,<$d00,<$d80,<$e00,<$e80,<$f00,<$f80
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.byte <$c28,<$ca8,<$d28,<$da8,<$e28,<$ea8,<$f28,<$fa8
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.byte <$c28,<$ca8,<$d28,<$da8,<$e28,<$ea8,<$f28,<$fa8
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.byte <$c50,<$cd0,<$d50,<$dd0,<$e50,<$ed0,<$f50,<$fd0
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.byte <$c50,<$cd0,<$d50,<$dd0,<$e50,<$ed0,<$f50,<$fd0
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c00_scrn_offsets_h:
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scrn_c00_offsets_h:
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.byte >$c00,>$c80,>$d00,>$d80,>$e00,>$e80,>$f00,>$f80
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.byte >$c00,>$c80,>$d00,>$d80,>$e00,>$e80,>$f00,>$f80
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.byte >$c28,>$ca8,>$d28,>$da8,>$e28,>$ea8,>$f28,>$fa8
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.byte >$c28,>$ca8,>$d28,>$da8,>$e28,>$ea8,>$f28,>$fa8
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.byte >$c50,>$cd0,>$d50,>$dd0,>$e50,>$ed0,>$f50,>$fd0
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.byte >$c50,>$cd0,>$d50,>$dd0,>$e50,>$ed0,>$f50,>$fd0
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gr_400_offsets_h:
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.byte >$400,>$480,>$500,>$580,>$600,>$680,>$700,>$780
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.byte >$428,>$4a8,>$528,>$5a8,>$628,>$6a8,>$728,>$7a8
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.byte >$450,>$4d0,>$550,>$5d0,>$650,>$6d0,>$750,>$7d0
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@ -12,6 +12,8 @@
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; $39e3e=237,118=4.22fps add scrn address lookup table
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; $39e3e=237,118=4.22fps add scrn address lookup table
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; $39fdf=237,535 add two scale multiplies
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; $39fdf=237,535 add two scale multiplies
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; $39e17=237,079=4.22fps change the init to also use multiply
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; $39e17=237,079=4.22fps change the init to also use multiply
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; $39dc9=237,001= change to use common lookup table (outside inner loop)
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CAL = $B0
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CAL = $B0
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CAH = $B1
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CAH = $B1
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@ -177,16 +179,15 @@ smc_even:
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ldy #$4c ; jmp ; 2
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ldy #$4c ; jmp ; 2
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smc_write:
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smc_write:
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sty rplot3_smc ; 4
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sty rplot3_smc ; 4
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asl ; now even ; 2
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tay ; 2
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tay ; 2
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lda gr_offsets,Y ; lookup low-res memory address ; 4
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lda common_offsets_l,Y ; lookup low-res memory address ; 4
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sta rplot1_smc+1 ; 4
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sta rplot1_smc+1 ; 4
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sta rplot2_smc+1 ; 4
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sta rplot2_smc+1 ; 4
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clc ; 2
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clc ; 2
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lda gr_offsets+1,Y ; 4
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lda gr_400_offsets_h,Y ; 4
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adc DRAW_PAGE ; add in draw page offset ; 3
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adc DRAW_PAGE ; add in draw page offset ; 3
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sta rplot1_smc+2 ; 4
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sta rplot1_smc+2 ; 4
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sta rplot2_smc+2 ; 4
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sta rplot2_smc+2 ; 4
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@ -235,9 +236,9 @@ rotozoom_xloop:
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; TODO: put these in zero page?
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; TODO: put these in zero page?
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; also we can share low bytes with other lookup
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; also we can share low bytes with other lookup
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lda c00_scrn_offsets_l,Y ; lookup low-res memory address ; 4
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lda common_offsets_l,Y ; lookup low-res memory address ; 4
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sta BASL ; 3
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sta BASL ; 3
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lda c00_scrn_offsets_h,Y ; 4
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lda scrn_c00_offsets_h,Y ; 4
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sta BASH ; 3
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sta BASH ; 3
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; carry was set a bit before to low bit of YPH
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; carry was set a bit before to low bit of YPH
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