mirror of
https://github.com/A2osX/A2osX.git
synced 2024-11-22 16:31:07 +00:00
163 lines
3.0 KiB
Plaintext
163 lines
3.0 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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* 1 : OP (XOR,SET,ORA)
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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 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 >LDYA CB.Cache+S.CB.X1
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jsr DIVMOD7YA
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tay
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lda COL.OFS,y
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phy
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ldy CB.Cache+S.CB.Y1
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clc
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adc BASEL,y
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sta ZPBasePtr
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lda BASEH,y
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sta ZPBasePtr+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 Select proper BANK
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lda CB.Cache+S.CB.OP
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* cmp #S.CB.OP.XOR
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beq SETPIXEL.MONO.XOR
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lda CB.Cache+S.CB.COLOR
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bne SETPIXEL.MONO.WHITE
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SETPIXEL.MONO.BLACK
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lda (ZPBasePtr)
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and Mono.NMasks,x
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sta (ZPBasePtr)
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rts
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SETPIXEL.MONO.WHITE
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lda (ZPBasePtr)
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ora Mono.Masks,x
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sta (ZPBasePtr)
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rts
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SETPIXEL.MONO.XOR
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lda (ZPBasePtr)
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eor Mono.Masks,x
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sta (ZPBasePtr)
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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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* clc
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adc BASEL,x setup line Base Ptr (cc by asl)
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sta ZPBasePtr ZPBasePtr now point to first of...
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lda BASEH,x
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sta ZPBasePtr+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 (ZPBasePtr)
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and Color.NMasks,x reset existing pixel,
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ora GBYTE
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sta (ZPBasePtr)
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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 (ZPBasePtr)
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and Color.NMasks,x reset existing pixel,
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ora GBYTE
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sta (ZPBasePtr)
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.11 inc ZPBasePtr
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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 (ZPBasePtr)
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and Color.NMasks,x reset existing pixel,
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ora GBYTE
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sta (ZPBasePtr)
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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 (ZPBasePtr)
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and Color.NMasks,x reset existing pixel,
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ora GBYTE
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sta (ZPBasePtr)
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.13 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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