85 lines
1.3 KiB
ArmAsm
85 lines
1.3 KiB
ArmAsm
// #LAYOUT# STD * #TAKE
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// #LAYOUT# X16 * #IGNORE
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// #LAYOUT# * KERNAL_0 #TAKE
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// #LAYOUT# * * #IGNORE
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//
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// Variables used:
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// - BLNSW (cursor blink switch)
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// - BLNCT (cursor blink countdown)
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// - GDBLN (cursor saved character)
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// - BLNON (if cursor is visible)
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// - GDCOL (colour under cursor)
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// - USER (current screen line colour pointer)
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// - PNT (current screen line pointer)
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// - PNTR (current screen x position)
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//
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cursor_blink:
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// Is the cursor enabled?
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lda BLNSW
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bne cursor_blink_end
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// Do we need to redraw things?
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dec BLNCT
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bpl cursor_blink_end
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// Check if cursor was visible or not, and toggle
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lda BLNON
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bne cursor_undraw
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// FALLTROUGH
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cursor_draw:
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jsr screen_get_clipped_PNTR
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lda (PNT),y
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sta GDBLN
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eor #$80
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sta (PNT),y
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// Also set cursor colour
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lda (USER),y
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sta GDCOL
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lda COLOR
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sta (USER),y
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lda #1
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sta BLNON
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bne cursor_blink_timer_reset // branches always
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cursor_disable:
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lda #$80
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sta BLNSW
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// FALLTHROUGH
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cursor_hide_if_visible:
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lda BLNON
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beq cursor_blink_end
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cursor_undraw:
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jsr screen_get_clipped_PNTR
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lda GDBLN
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sta (PNT),y
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lda GDCOL
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sta (USER),y
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lda #0
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sta BLNON
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// FALLTROUGH
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cursor_blink_timer_reset:
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// Rest blink counter (Mapping the 64, p39-40)
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lda #20
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sta BLNCT
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// FALLTROUGH
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cursor_blink_end:
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rts
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