mirror of
https://github.com/A2osX/A2osX.git
synced 2024-06-09 00:29:28 +00:00
184 lines
3.5 KiB
Plaintext
184 lines
3.5 KiB
Plaintext
PR#3
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PREFIX /A2OSX.BUILD
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LOMEM $A00
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INC 1
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AUTO 6
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.LIST OFF
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*--------------------------------------
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* SETPIXEL
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* In : YA = Ptr to CtrlBlk :
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* 1 : OP (XOR only)
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* 2 : Mode
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* 3 : Color
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* 4 : SrcX1
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* 6 : SrcY1
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*--------------------------------------
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SETPIXEL >STYA ZPBase
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ldy #S.CB.Y1 Skip S.CB.Y1+1.....always 0
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.1 lda (ZPBase),y
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sta CB.Cache,y
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dey
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bpl .1
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sta SET80STORE
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lda CB.Cache+S.CB.MODE
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bit #S.CB.MODE.C16
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bne SETPIXEL.C16
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SETPIXEL.MONO ldx CB.Cache+S.CB.X1+1 Get X Hi byte....
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lda DIV7.lo,x
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sta .1+1
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lda DIV7.hi,x
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sta .1+2
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lda MOD7.lo,x
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sta .2+1
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lda MOD7.hi,x
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sta .2+2
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lda DIV7.BASE,x
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ldx CB.Cache+S.CB.X1
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clc
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.1 adc $ffff,x DIV7 : x = X.LO, a = X DIV 7
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pha save X DIV 7
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lsr
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ldy CB.Cache+S.CB.Y1
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clc
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adc BASEL,y setup line Base Ptr (A=Col)
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sta ZPBase
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lda BASEH,y
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sta ZPBase+1
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ply
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lda COL.BANK,y
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tay
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sta $c000,y
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.2 ldy $ffff,x MOD7 : x = X.LO, y = X MOD 7
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lda CB.Cache+S.CB.OP
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beq .5
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lda (ZPBase) XOR
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eor Mono.Masks,y y = mod 7
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sta (ZPBase)
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sta CLR80STORE
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rts
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.5 lda (ZPBase)
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ldx CB.Cache+S.CB.COLOR get color
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bne .6
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and Mono.NMasks,y includes And $7F for mono
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sta (ZPBase)
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sta CLR80STORE
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rts
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.6 and #$7F switch back this byte to mono
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ora Mono.Masks,y
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sta (ZPBase)
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sta CLR80STORE
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rts
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SETPIXEL.C16 lda CB.Cache+S.CB.X1
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lsr CB.Cache+S.CB.X1+1 divide by 4
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ror
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lsr CB.Cache+S.CB.X1+1
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ror
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tay Y=X/4 (range 0->139)
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lda DIV7.0,y A=X/4/7 (range 0->19)
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asl times 2 (range 0->38)
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ldx CB.Cache+S.CB.Y1
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adc BASEL,x setup line Base Ptr (cc by asl)
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sta ZPBase ZPBase now point to first of...
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lda BASEH,x
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sta ZPBase+1 ...the 4 columns
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lda MOD7.0,y get MOD
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asl times 4 to compute index in MASK tables
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asl
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tax set in X for Masks,NMasks
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lda CB.Cache+S.CB.COLOR
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asl times 4 to compute index in PIXELS table
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asl
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tay
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lda Color.Masks,x bits in 1st byte to light?
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beq .10
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and Color.Pixels,y apply color
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sta GBYTE
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sta SETPAGE2
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lda (ZPBase)
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and Color.NMasks,x reset existing pixel,
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ora GBYTE
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sta (ZPBase)
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.10 inx
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iny
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lda Color.Masks,x
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beq .11
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and Color.Pixels,y apply color
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sta GBYTE
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sta CLRPAGE2
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lda (ZPBase)
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and Color.NMasks,x reset existing pixel,
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ora GBYTE
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sta (ZPBase)
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.11 inc ZPBase
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inx
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iny
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lda Color.Masks,x
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beq .12
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and Color.Pixels,y apply color
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sta GBYTE
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sta SETPAGE2
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lda (ZPBase)
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and Color.NMasks,x reset existing pixel,
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ora GBYTE
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sta (ZPBase)
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.12 inx
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iny
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lda Color.Masks,x
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beq .13
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and Color.Pixels,y apply color
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sta GBYTE
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sta CLRPAGE2
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lda (ZPBase)
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and Color.NMasks,x reset existing pixel,
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ora GBYTE
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sta (ZPBase)
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.13 sta CLR80STORE
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rts
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*--------------------------------------
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* GETPIXEL
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*--------------------------------------
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GETPIXEL rts
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*--------------------------------------
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MAN
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SAVE /A2OSX.SRC/DRV/DHGR.DRV.S.PIX
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LOAD /A2OSX.SRC/DRV/DHGR.DRV.S
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ASM
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