A2osX/DRV/DHGR.DRV.S.BLT.txt
2021-06-05 17:48:54 +02:00

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NEW
AUTO 3,1
*--------------------------------------
* BitBlt
* 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, Aux hMem in S.CB.SrcPtr
* S.CB.DstPtr : pointer to Save/restore Buffer
*--------------------------------------
BITBLT >LDYA CB.Cache+S.CB.X1
jsr LBUF.SetBounds1YA
stx BLT.ScrBitOfs
lda CB.Cache+S.CB.X1
clc
adc CB.Cache+S.CB.SrcW
pha
lda CB.Cache+S.CB.X1+1
adc CB.Cache+S.CB.SrcW+1
ply
bne .10
dec
.10 dey
jsr LBUF.SetBounds2YA
lda CB.Cache+S.CB.SrcH
sta ZPTmpByte
*--------------------------------------
lda CB.Cache+S.CB.OP
bit #S.CB.OP.RESTORE
beq BITBLT.0
ldy CB.Cache+S.CB.DstPtr
lda CB.Cache+S.CB.DstPtr+1
bne .1
sta SETREADAUX DstPtr is AUX hMem
tya
>SYSCALL2 GetMemPtr
.1 >STYA ZPBMSavePtr
ldy CB.Cache+S.CB.Y1
.2 lda BASEL,y setup line Base Ptr
sta ZPBasePtr
lda BASEH,y
sta ZPBasePtr+1
iny
phy
ldx LBUF.C1
.3 >X2PageY
lda (ZPBMSavePtr)
sta (ZPBasePtr),y
inc ZPBMSavePtr
bne .4
inc ZPBMSavePtr+1
.4 cpx LBUF.C2
inx
bcc .3
ply
dec ZPTmpByte
bne .2
sta CLRREADAUX
BITBLT.RTS rts
*--------------------------------------
BITBLT.0 bit #S.CB.OP.SAVE
beq BITBLT.1
ldy CB.Cache+S.CB.DstPtr
lda CB.Cache+S.CB.DstPtr+1
bne .1
tya DstPtr is AUX hMem
>SYSCALL2 GetStkObjPtr
sta SETWRITEAUX
.1 >STYA ZPBMSavePtr
ldy CB.Cache+S.CB.Y1
.2 lda BASEL,y setup line Base Ptr
sta ZPBasePtr
lda BASEH,y
sta ZPBasePtr+1
iny
phy
ldx LBUF.C1
.3 >X2PageY
lda (ZPBasePtr),y
sta (ZPBMSavePtr)
inc ZPBMSavePtr
bne .4
inc ZPBMSavePtr+1
.4 cpx LBUF.C2
inx
bcc .3
ply
dec ZPTmpByte
bne .2
sta CLRWRITEAUX
lda CB.Cache+S.CB.OP
*--------------------------------------
BITBLT.1 and #$0F
beq BITBLT.RTS
ldy CB.Cache+S.CB.SrcPtr
lda CB.Cache+S.CB.SrcPtr+1
bne .4
sta SETREADAUX SrcPtr is AUX hMem
tya
>SYSCALL2 GetMemPtr
.4 >STYA ZPBMDataPtr
*--------------------------------------
BITBLT.2 ldy #S.BM-1
.1 lda (ZPBMDataPtr),y
sta BM.Cache,y
dey
bpl .1
lda BM.Cache+S.BM.F
eor #S.BM.F.BBP1
cmp #1
lda #0
ror
sta 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
.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
lda CB.Cache+S.CB.SrcX
pha
and #7
sta BLT.BMBitOfs
pla
lsr CB.Cache+S.CB.SrcX+1
ror
lsr CB.Cache+S.CB.SrcX+1
ror
lsr CB.Cache+S.CB.SrcX+1
ror
pha
clc
adc BLT.BMDataPtr
sta BLT.BMDataPtr
bcc .3
inc BLT.BMDataPtr+1
clc
.3 pla
adc BLT.BMMaskPtr
sta BLT.BMMaskPtr
bcc .4
inc BLT.BMMaskPtr+1
.4 lda BM.Cache+S.BM.H
cmp CB.Cache+S.CB.SrcH
bcs .5
sta CB.Cache+S.CB.SrcH
.5 ldx BLT.ScrBitOfs
bne BITBLT.LOOPx
*------------ Shift 0
BITBLT.LOOP0 lda CB.Cache+S.CB.OP
bit #S.CB.OP.MASK
beq .2
>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
.2 >LDYA BLT.BMDataPtr
>STYA ZPBMDataPtr
lda BLT.BMBitOfs
sta BLT.BMBitOfsL
ldx LBUF.C1
stx BLT.ScrColIdx
.3 jsr BLT.Get7BMBits we have 0xxxxxxxx in A
ora BLT.CMASK
ldx BLT.ScrColIdx
sta LBUF.DATA,x
inc BLT.ScrColIdx
cpx LBUF.C2
bne .3
ldy CB.Cache+S.CB.Y1
jsr LBUF.DrawAtY
inc CB.Cache+S.CB.Y1
dec CB.Cache+S.CB.SrcH
beq .8
lda CB.Cache+S.CB.OP
bit #S.CB.OP.MASK
beq .4
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 BITBLT.LOOP0
inc BLT.BMDataPtr+1
bra BITBLT.LOOP0
.8 sta CLRREADAUX
rts
*--------------------------------------
BITBLT.LOOPx ldy Shift.L.LO-1,x X = 1->6
sty ZPScrShiftPtr
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
*------------ Shift 1->6 Comment : SCRBitOfs=X=3
BITBLT.LOOPx.0 lda CB.Cache+S.CB.OP X = BLT.ScrBitOfs
bit #S.CB.OP.MASK
beq BITBLT.LOOPx.4
>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 #$ff SELF MODIFIED : #%01110000 get only col2 bites
tay
lda (ZPScrShiftPtr),y shift right 4 (=shift left 3!!!) : 00000ddd
sta LBUF.MASK+1,x
inc BLT.ScrColIdx
cpx LBUF.C2
bne BITBLT.LOOPx.1
BITBLT.LOOPx.4 >LDYA BLT.BMDataPtr
>STYA ZPBMDataPtr
lda BLT.BMBitOfs
sta BLT.BMBitOfsL
ldx LBUF.C1
stx BLT.ScrColIdx
stz LBUF.DATA,x make sure C1 not ORed with trash in "ora LBUF.DATA,x"
BITBLT.LOOPx.5 jsr BLT.Get7BMBits we have c6543210 in A, destination : COL=3210xxx, COL+1=xxxx654
pha save BM byte for 2nd col
BITBLT.LOOPx.6 and #$ff SELF MODIFIED : MASK WITH #%00001111, keep col1 bits only
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
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
ldy CB.Cache+S.CB.Y1
jsr LBUF.DrawAtY
inc CB.Cache+S.CB.Y1
dec CB.Cache+S.CB.SrcH
beq .8
lda CB.Cache+S.CB.OP
bit #S.CB.OP.MASK
beq .1
lda BLT.BMMaskPtr
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.0
.8 sta CLRREADAUX
rts
*--------------------------------------
* BM Data/Mask bits :
* 76543210 76543210
* ^
* BMBitOfsL (0->7)
* LBUF DATA/MASK Bits
* c6543210 c6543210
* ^
*--------------------------------------
BLT.Get7BMBits ldx BLT.BMBitOfsL
beq BLT.Get7BMBits0 OFS=0, done! and no need to advance ZPBMDataPtr
dex OFS 0->6
beq BLT.Get7BMBits1 OFS was 1....done and go to next byte, OFS=0
lda Shift.R.LO-1,x X = 1->6
sta ZPBMShiftPtr
lda Shift.R.HI-1,x X = 1->6
sta ZPBMShiftPtr+1
lda (ZPBMDataPtr)
lsr OFS=1->7, shift one (Range 0->127)
and Mask7BitsH,x Get only left upper X bits
tay xxxxx000
lda (ZPBMShiftPtr),y shift'em RIGHT 000xxxxx
pha
inc ZPBMDataPtr Next BM data byte
bne .1
inc ZPBMDataPtr+1
.1 lda (ZPBMDataPtr) get next byte
and Mask7BitsL,x only first Y bits 000000yy
tay
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
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
*--------------------------------------
MAN
SAVE usr/src/drv/dhgr.drv.s.blt
LOAD usr/src/drv/dhgr.drv.s
ASM