A2osX/DRV/DHGR.DRV.S.BLT.txt

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NEW
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AUTO 3,1
*--------------------------------------
* BitBlt
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* S.CB.X1 : Destination X (screen)
* S.CB.Y1 : Destination Y (screen)
* S.CB.DstX : X1 in bitmap/mask
* S.CB.DstY : Y1 in bitmap/mask
* S.CB.SrcW : width in bitmap/mask
* S.CB.SrcH : height in bitmap/mask
* S.CB.SrcPtr : pointer to S.BM
* S.CB.SrcPtr+1 = 0, hMem in S.CB.SrcPtr
* S.CB.DstPtr : pointer to Save Buffer
*--------------------------------------
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BITBLT ldy CB.Cache+S.CB.SrcPtr
lda CB.Cache+S.CB.SrcPtr+1
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bne .1
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sta SETREADAUX SrcPtr is AUX hMem
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tya
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>SYSCALL2 GetMemPtr
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.1 >STYA ZPBMDataPtr
lda CB.Cache+S.CB.OP
bit #S.CB.OP.SAVE+S.CB.OP.RESTORE
beq .3
ldy CB.Cache+S.CB.DstPtr
lda CB.Cache+S.CB.DstPtr+1
bne .2
sta SETWRITEAUX DstPtr is AUX hMem
tya
>SYSCALL2 GetMemPtr
.2 >STYA ZPBMSavePtr
.3 jsr BITBLT.1
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sta CLRREADAUX
sta CLRWRITEAUX
rts
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BITBLT.1 ldy #S.BM-1
.1 lda (ZPBMDataPtr),y
sta BM.Cache,y
dey
bpl .1
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ldx #0
lda BM.Cache+S.BM.F
cmp #S.BM.F.BBP1
beq .11
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ldx #$80
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.11 stx BLT.CMASK
lda ZPBMDataPtr
clc
adc BM.Cache+S.BM.MASK.OFS
sta ZPBMMaskPtr
lda ZPBMDataPtr+1
adc BM.Cache+S.BM.MASK.OFS+1
sta ZPBMMaskPtr+1
lda ZPBMDataPtr
clc
adc #S.BM
sta ZPBMDataPtr
bcc .2
inc ZPBMDataPtr+1
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.2 >LDYA CB.Cache+S.CB.SrcY
ldx BM.Cache+S.BM.RowBytes
jsr YAMultX
pha
tya
clc
adc ZPBMDataPtr
sta BLT.BMDataPtr
pla
pha
adc ZPBMDataPtr+1
sta BLT.BMDataPtr+1
tya
adc ZPBMMaskPtr
sta BLT.BMMaskPtr
pla
adc ZPBMMaskPtr+1
sta BLT.BMMaskPtr+1
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lda CB.Cache+S.CB.SrcX
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pha
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and #7
sta BLT.BMBitOfs
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pla
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lsr CB.Cache+S.CB.SrcX+1
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ror
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lsr CB.Cache+S.CB.SrcX+1
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ror
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lsr CB.Cache+S.CB.SrcX+1
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ror
pha
clc
adc BLT.BMDataPtr
sta BLT.BMDataPtr
bcc .3
inc BLT.BMDataPtr+1
clc
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.3 pla
adc BLT.BMMaskPtr
sta BLT.BMMaskPtr
bcc .4
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inc BLT.BMMaskPtr+1
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.4 >LDYA CB.Cache+S.CB.X1
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jsr LBUF.SetBounds1YA
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stx BLT.ScrBitOfs
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lda CB.Cache+S.CB.X1
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clc
adc CB.Cache+S.CB.SrcW
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tay
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lda CB.Cache+S.CB.X1+1
adc CB.Cache+S.CB.SrcW+1
pha
tya
sbc #0
tay
pla
sbc #0
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jsr LBUF.SetBounds2YA
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ldx BLT.ScrBitOfs
beq BITBLT.LOOP0
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ldy Shift.L.LO-1,x X = 1->6
sty ZPScrShiftPtr
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ldy Shift.L.HI-1,x X = 1->6
sty ZPScrShiftPtr+1
lda Shift7BitsCol1,x get #%00001111, BM bits that go in Col1
sta BITBLT.LOOPx.2+1
sta BITBLT.LOOPx.6+1
lda Shift7BitsCol2,x get #%01110000, BM bits that go in Col2
sta BITBLT.LOOPx.3+1
sta BITBLT.LOOPx.7+1
jmp BITBLT.LOOPx
*------------ Shift 0
BITBLT.LOOP0 lda CB.Cache+S.CB.OP
bit #S.CB.OP.MASK
beq .2
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>LDYA BLT.BMMaskPtr
>STYA ZPBMDataPtr
lda BLT.BMBitOfs
sta BLT.BMBitOfsL
ldx LBUF.C1
stx BLT.ScrColIdx
.1 jsr BLT.Get7BMBits we have 0xxxxxxxx in A
ldx BLT.ScrColIdx
sta LBUF.MASK,x
inc BLT.ScrColIdx
cpx LBUF.C2
bne .1
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.2 >LDYA BLT.BMDataPtr
>STYA ZPBMDataPtr
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lda BLT.BMBitOfs
sta BLT.BMBitOfsL
ldx LBUF.C1
stx BLT.ScrColIdx
.3 jsr BLT.Get7BMBits we have 0xxxxxxxx in A
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ora BLT.CMASK
ldx BLT.ScrColIdx
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sta LBUF.DATA,x
inc BLT.ScrColIdx
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cpx LBUF.C2
bne .3
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ldy CB.Cache+S.CB.Y1
jsr LBUF.DrawAtY
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inc CB.Cache+S.CB.Y1
dec CB.Cache+S.CB.SrcH
beq .8
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lda CB.Cache+S.CB.OP
bit #S.CB.OP.MASK
beq .4
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lda BLT.BMMaskPtr
clc
adc BM.Cache+S.BM.RowBytes
sta BLT.BMMaskPtr
bcc .4
inc BLT.BMMaskPtr+1
.4 lda BLT.BMDataPtr
clc
adc BM.Cache+S.BM.RowBytes
sta BLT.BMDataPtr
bcc .5
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inc BLT.BMDataPtr+1
.5 jmp BITBLT.LOOP0
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.8 clc
rts
*------------ Shift 1->6 Comment : SCRBitOfs=X=3
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BITBLT.LOOPx lda CB.Cache+S.CB.OP X = BLT.ScrBitOfs
bit #S.CB.OP.MASK
beq BITBLT.LOOPx.4
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>LDYA BLT.BMMaskPtr
>STYA ZPBMDataPtr
lda BLT.BMBitOfs
sta BLT.BMBitOfsL
ldx LBUF.C1
stx BLT.ScrColIdx
stz LBUF.MASK,x make sure C1 not ORed with trash in "ora LBUF.DATA,x"
BITBLT.LOOPx.1 jsr BLT.Get7BMBits we have c6543210 in A, destination : COL=3210xxx, COL+1=xxxx654
pha save BM byte for 2nd col
BITBLT.LOOPx.2 and #$ff SELF MODIFIED : MASK WITH #%00001111, keep col1 bits only
tay
lda (ZPScrShiftPtr),y make 0000dddd Shift left 3 : 0dddd000
ldx BLT.ScrColIdx Get actual COL index
ora LBUF.MASK,x Light proper bits : 0dddd???
sta LBUF.MASK,x store 0xdddd???
pla Get back BM Byte
BITBLT.LOOPx.3 and #$ff SELF MODIFIED : #%01110000 get only col2 bites
tay
lda (ZPScrShiftPtr),y shift right 4 (=shift left 3!!!) : 00000ddd
sta LBUF.MASK+1,x
inc BLT.ScrColIdx
cpx LBUF.C2
bne BITBLT.LOOPx.1
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BITBLT.LOOPx.4 >LDYA BLT.BMDataPtr
>STYA ZPBMDataPtr
lda BLT.BMBitOfs
sta BLT.BMBitOfsL
ldx LBUF.C1
stx BLT.ScrColIdx
stz LBUF.DATA,x make sure C1 not ORed with trash in "ora LBUF.DATA,x"
BITBLT.LOOPx.5 jsr BLT.Get7BMBits we have c6543210 in A, destination : COL=3210xxx, COL+1=xxxx654
pha save BM byte for 2nd col
BITBLT.LOOPx.6 and #$ff SELF MODIFIED : MASK WITH #%00001111, keep col1 bits only
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tay
lda (ZPScrShiftPtr),y make 0000dddd Shift left 3 : 0dddd000
ora BLT.CMASK
ldx BLT.ScrColIdx Get actual COL index
ora LBUF.DATA,x Light proper bits : 0dddd???
sta LBUF.DATA,x store 0xdddd???
pla Get back BM Byte
BITBLT.LOOPx.7 and #$ff SELF MODIFIED : #%01110000 get only col2 bites
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tay
lda (ZPScrShiftPtr),y shift right 4 (=shift left 3!!!) : 00000ddd
ora BLT.CMASK
sta LBUF.DATA+1,x
inc BLT.ScrColIdx
cpx LBUF.C2
bne BITBLT.LOOPx.5
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ldy CB.Cache+S.CB.Y1
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jsr LBUF.DrawAtY
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inc CB.Cache+S.CB.Y1
dec CB.Cache+S.CB.SrcH
beq .8
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lda CB.Cache+S.CB.OP
bit #S.CB.OP.MASK
beq .1
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lda BLT.BMMaskPtr
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clc
adc BM.Cache+S.BM.RowBytes
sta BLT.BMMaskPtr
bcc .1
inc BLT.BMMaskPtr+1
.1 lda BLT.BMDataPtr
clc
adc BM.Cache+S.BM.RowBytes
sta BLT.BMDataPtr
bcc .2
inc BLT.BMDataPtr+1
.2 jmp BITBLT.LOOPx
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.8 clc
rts
*--------------------------------------
* BM Data/Mask bits :
* 76543210 76543210
* ^
* BMBitOfsL (0->7)
* LBUF DATA/MASK Bits
* c6543210 c6543210
* ^
*--------------------------------------
BLT.Get7BMBits ldx BLT.BMBitOfsL
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beq BLT.Get7BMBits0 OFS=0, done! and no need to advance ZPBMDataPtr
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dex OFS 0->6
beq BLT.Get7BMBits1 OFS was 1....done and go to next byte, OFS=0
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lda Shift.R.LO-1,x X = 1->6
sta ZPBMShiftPtr
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lda Shift.R.HI-1,x X = 1->6
sta ZPBMShiftPtr+1
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lda (ZPBMDataPtr)
lsr OFS=1->7, shift one (Range 0->127)
and Mask7BitsH,x Get only left upper X bits
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tay xxxxx000
lda (ZPBMShiftPtr),y shift'em RIGHT 000xxxxx
pha
inc ZPBMDataPtr Next BM data byte
bne .1
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inc ZPBMDataPtr+1
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.1 lda (ZPBMDataPtr) get next byte
and Mask7BitsL,x only first Y bits 000000yy
tay
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pla get back right part bits 000xxxxx
ora (ZPBMShiftPtr),y shift right 000000yy and ORA with 000xxxxx=0yyxxxxx
dec BLT.BMBitOfsL X = 1->6, ADD 7 MOD 8.....
rts
BLT.Get7BMBits0 lda #7
sta BLT.BMBitOfsL Was 0, add 7 bits
lda (ZPBMDataPtr)
and #%01111111 Get only 7 needed bits
rts
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BLT.Get7BMBits1 lda (ZPBMDataPtr)
lsr OFS=1->7, shift one (Range 0->127)
stz BLT.BMBitOfsL LSR did already 0xxxxxxx, Was 1, add 7 bits, MOD 8=0
inc ZPBMDataPtr go to next byte in BM line
bne .8
inc ZPBMDataPtr+1
.8 rts
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*--------------------------------------
MAN
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SAVE usr/src/drv/dhgr.drv.s.blt
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LOAD usr/src/drv/dhgr.drv.s
ASM