NEW AUTO 3,1 .LIST OFF *-------------------------------------- * BitBlt * S.CB.X1 : SrcX1 in bitmap/mask * S.CB.Y1 : SrcY1 * S.CB.SrcW : width * S.CB.SrcH : height * S.CB.DstX : Destination X (screen) * S.CB.DstY : Destination Y (screen) * S.CB.SrcPtr : pointer to S.BM * S.CB.SrcPtr+1 = 0, hMem in S.CB.SrcPtr * S.CB.DstPtr : pointer to Save Buffer *-------------------------------------- BITBLT ldy CB.CACHE+S.CB.SrcPtr lda CB.CACHE+S.CB.SrcPtr+1 bne BITBLT.1 sta SETREADAUX sta SETWRITEAUX tya >SYSCALL2 GetMemPtr jsr BITBLT.1 sta CLRREADAUX sta CLRWRITEAUX rts BITBLT.1 >STYA ZPBMDataPtr ldy #S.BM-1 .1 lda (ZPBMDataPtr),y sta BM.Cache,y dey bpl .1 ldx #0 lda BM.Cache+S.BM.F cmp #S.BM.F.BBP1 beq .11 ldx #$80 .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 .2 >LDYA CB.Cache+S.CB.DstPtr >STYA ZPBMSavePtr >LDYA CB.Cache+S.CB.Y1 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.X1 pha and #7 sta BLT.BMBitOfs pla lsr CB.Cache+S.CB.X1+1 ror lsr CB.Cache+S.CB.X1+1 ror lsr CB.Cache+S.CB.X1+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 >LDYA CB.Cache+S.CB.DstX jsr LBUF.SetBounds1YA stx BLT.SCRBitOfs lda CB.Cache+S.CB.DstX clc adc CB.Cache+S.CB.SrcW tay lda CB.Cache+S.CB.DstX+1 adc CB.Cache+S.CB.SrcW+1 pha tya sbc #0 tay pla sbc #0 jsr LBUF.SetBounds2YA ldx BLT.SCRBitOfs beq BITBLT.LOOP0 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 jmp 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.DstY jsr LBUF.DrawAtY inc CB.Cache+S.CB.DstY 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 .5 inc BLT.BMDataPtr+1 .5 jmp BITBLT.LOOP0 .8 rts *------------ Shift 1->6 Comment : SCRBitOfs=X=3 BITBLT.LOOPx 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.DstY jsr LBUF.DrawAtY inc CB.Cache+S.CB.DstY 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 .8 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.RECT LOAD USR/SRC/DRV/DHGR.DRV.S ASM