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102 lines
1.9 KiB
ArmAsm
102 lines
1.9 KiB
ArmAsm
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.export soft80_kplot
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.export soft80_plotinit
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.include "c64.inc"
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.include "soft80.inc"
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soft80_kplot:
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bcs @getpos
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; calc pointer to bitmap
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lda _bitmaplo,x
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clc
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adc _bitmapxlo,y
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sta SCREEN_PTR
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lda _bitmaphi,x
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adc _bitmapxhi,y
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sta SCREEN_PTR+1
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; calc pointer to vram
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tya
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lsr a
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clc
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adc _vramlo,x
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sta CRAM_PTR
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lda #0
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adc _vramhi,x
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sta CRAM_PTR+1
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@getpos:
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ldx CURS_Y
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ldy CURS_X
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rts
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; FIXME: perhaps just include the respective tables directly?
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soft80_plotinit:
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; create screen-rows base tables (bitmap)
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lda #<soft80_bitmap
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sta SCREEN_PTR
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lda #>soft80_bitmap
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sta SCREEN_PTR+1
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ldx #$00
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l1:
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lda SCREEN_PTR
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sta _bitmaplo,x
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clc
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adc #<(40*8)
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sta SCREEN_PTR
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lda SCREEN_PTR+1
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sta _bitmaphi,x
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adc #>(40*8)
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sta SCREEN_PTR+1
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inx
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cpx #25
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bne l1
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; create screen-rows base tables (colorram)
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lda #<soft80_vram
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sta CRAM_PTR
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lda #>soft80_vram
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sta CRAM_PTR+1
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ldx #$00
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l1b:
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lda CRAM_PTR
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sta _vramlo,x
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clc
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adc #<(40)
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sta CRAM_PTR
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lda CRAM_PTR+1
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sta _vramhi,x
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adc #>(40)
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sta CRAM_PTR+1
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inx
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cpx #25
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bne l1b
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rts
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_bitmapxlo:
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.repeat 80,col1
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.byte <((col1/2)*8)
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.endrepeat
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_bitmapxhi:
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.repeat 80,col
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.byte >((col/2)*8)
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.endrepeat
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.bss
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_vramlo:
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.res 25
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_vramhi:
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.res 25
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_bitmaplo:
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.res 25
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_bitmaphi:
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.res 25
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