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shave some cycles

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4am 2020-11-20 23:33:59 -05:00
parent 5e05736197
commit bfe84c5128
1 changed files with 14 additions and 18 deletions
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32
src/fx/fx.dhgr.soft.diagonal.a
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@ -23,6 +23,14 @@ hgr1hi = $0300 ; [$C0 bytes, main memory only]
sta $3d
}
!macro COPY_BIT_BY .src1, .dest1, .copymask {
lda (.src1),y
eor (.dest1),y ; merge source and destination bits
and .copymask ; isolate the bits to replace, zero the rest
eor (.dest1),y ; unmerge source and destination bits, leaves 'to keep' destination bits intact
sta (.dest1),y ; write the result
}
!source "src/fx/macros.a"
!source "src/fx/fx.dhgr.common.a"
@ -69,12 +77,10 @@ PassLoop
+IS_Y_OFFSCREEN
+LBCS @block2
ldx #7
clc
!for i, 0, 7 {
+COPY_BIT $3c, $26, copymasks1
+COPY_BIT_BY $3c, $26, copymasks1+i
!if i < 7 {
dex
+HGR_INC_WITHIN_BLOCK
}
}
@ -84,12 +90,10 @@ PassLoop
+IS_Y_OFFSCREEN
+LBCS @block3
ldx #7
clc
!for i, 0, 7 {
+COPY_BIT $3c, $26, copymasks2
+COPY_BIT_BY $3c, $26, copymasks2+i
!if i < 7 {
dex
+HGR_INC_WITHIN_BLOCK
}
}
@ -99,12 +103,10 @@ PassLoop
+IS_Y_OFFSCREEN
+LBCS @block4
ldx #7
clc
!for i, 0, 7 {
+COPY_BIT $3c, $26, copymasks3
+COPY_BIT_BY $3c, $26, copymasks3+i
!if i < 7 {
dex
+HGR_INC_WITHIN_BLOCK
}
}
@ -114,12 +116,10 @@ PassLoop
+IS_Y_OFFSCREEN
+LBCS @block5
ldx #7
clc
!for i, 0, 7 {
+COPY_BIT $3c, $26, copymasks4
+COPY_BIT_BY $3c, $26, copymasks4+i
!if i < 7 {
dex
+HGR_INC_WITHIN_BLOCK
}
}
@ -129,12 +129,10 @@ PassLoop
+IS_Y_OFFSCREEN
+LBCS @block6
ldx #7
clc
!for i, 0, 7 {
+COPY_BIT $3c, $26, copymasks5
+COPY_BIT_BY $3c, $26, copymasks5+i
!if i < 7 {
dex
+HGR_INC_WITHIN_BLOCK
}
}
@ -144,12 +142,10 @@ PassLoop
+IS_Y_OFFSCREEN
+LBCS @block7
ldx #7
clc
!for i, 0, 7 {
+COPY_BIT $3c, $26, copymasks6
+COPY_BIT_BY $3c, $26, copymasks6+i
!if i < 7 {
dex
+HGR_INC_WITHIN_BLOCK
}
}