A2osX/DRV/DHGR.DRV.S.PIX.txt

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NEW
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AUTO 3,1
*--------------------------------------
* SETPIXEL
* 1 : OP (XOR,SET,ORA)
* 2 : Mode
* 3 : Color
* 4 : SrcX1
* 6 : SrcY1
*--------------------------------------
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SETPIXEL lda CB.Cache+S.CB.M
bit #S.CB.M.C16
bne SETPIXEL.C16
SETPIXEL.MONO >LDYA CB.Cache+S.CB.X1
jsr DIVMOD7YA
tay
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lsr
phy
ldy CB.Cache+S.CB.Y1
clc
adc BASEL,y
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sta ZPBasePtr
lda BASEH,y
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sta ZPBasePtr+1
ply
lda COL.BANK,y
tay
sta $C000,y Select proper BANK
lda CB.Cache+S.CB.OP
* cmp #S.CB.OP.XOR
beq SETPIXEL.MONO.XOR
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lda CB.Cache+S.CB.COLOR
bne SETPIXEL.MONO.WHITE
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SETPIXEL.MONO.BLACK
lda (ZPBasePtr)
and Mono.NMasks,x
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sta (ZPBasePtr)
rts
SETPIXEL.MONO.WHITE
lda (ZPBasePtr)
and #$7f Clear Color Bit
ora Mono.Masks,x
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sta (ZPBasePtr)
rts
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SETPIXEL.MONO.XOR
lda (ZPBasePtr)
and #$7f Clear Color Bit
eor Mono.Masks,x
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sta (ZPBasePtr)
rts
SETPIXEL.C16 lda CB.Cache+S.CB.X1
lsr CB.Cache+S.CB.X1+1 divide by 4
ror
lsr CB.Cache+S.CB.X1+1
ror
tay Y=X/4 (range 0->139)
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ldx CB.Cache+S.CB.Y1
* Y = PixelX (0,139), X = PixelY (0,191)
SETPIXEL.C16.YX lda DIV7.0,y PixelX MOD 7 (range 0->19)
asl times 2 (range 0->38)
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* clc
adc BASEL,x setup line Base Ptr (cc by asl)
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sta ZPBasePtr ZPBasePtr now point to first of...
lda BASEH,x
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sta ZPBasePtr+1 ...the 4 columns
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lda MOD7.0,y get pixelX MOD7
asl times 4 to compute index in MASK tables
asl
tax set in X for Masks,NMasks
lda CB.Cache+S.CB.COLOR
asl times 4 to compute index in PIXELS table
asl
tay
lda Color.Masks,x bits in 1st byte to light?
beq .10
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sta SETPAGE2
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jsr .81
.10 inx
iny
lda Color.Masks,x
beq .11
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jsr .80
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.11 inc ZPBasePtr
inx
iny
lda Color.Masks,x
beq .12
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sta SETPAGE2
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jsr .81
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.12 inx
iny
lda Color.Masks,x
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beq .88
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.80 sta CLRPAGE2
.81 and Color.Pixels,y apply color
sta ZPTmpByte
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lda (ZPBasePtr)
and Color.NMasks,x reset existing pixel,
ora ZPTmpByte
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sta (ZPBasePtr)
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.88 rts
*--------------------------------------
* GETPIXEL
*--------------------------------------
GETPIXEL rts
*--------------------------------------
MAN
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SAVE usr/src/drv/dhgr.drv.s.pix
LOAD usr/src/drv/dhgr.drv.s
ASM