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40 lines
1.1 KiB
ArmAsm
40 lines
1.1 KiB
ArmAsm
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; 2022-03-29, Greg King
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; unsigned char cpeekcolor (void);
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; /* Return the colors from the current cursor position. */
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;
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.export _cpeekcolor
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.include "cx16.inc"
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.macpack generic
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screen_addr := $1B000 ; VRAM address of text screen
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_cpeekcolor:
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php
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lda CURS_FLAG ; is the cursor currently off?
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bne @L1
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sei ; don't let cursor blinking interfere
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ldx CURS_STATE ; is cursor currently displayed?
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beq @L1 ; jump if not
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lda CURS_COLOR ; get color under cursor
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bra @L2
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@L1: stz VERA::CTRL ; use port 0
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lda CURS_Y
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add #<(>screen_addr)
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sta VERA::ADDR+1 ; set row number
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lda #^screen_addr
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sta VERA::ADDR+2
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lda CURS_X ; get character column
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sec ; color attribute is second byte
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rol a
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sta VERA::ADDR
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lda VERA::DATA0 ; get color of character
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@L2: plp
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ldx #>$0000
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rts
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