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76 lines
2.0 KiB
ArmAsm
76 lines
2.0 KiB
ArmAsm
;
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; Default mouse callbacks for the CX16
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;
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; 2019-12-25, Greg King
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;
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; All functions in this module should be interrupt-safe
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; because they might be called from an interrupt handler.
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;
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.export _mouse_def_callbacks
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.include "cx16.inc"
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msprite:
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stz VERA::CTRL ; set address for VERA's data port zero
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lda #<(VERA::SPRITE::ATTRIB::Z_FLIP + 0 * 8)
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ldx #>(VERA::SPRITE::ATTRIB::Z_FLIP + 0 * 8)
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ldy #^(VERA::SPRITE::ATTRIB::Z_FLIP + 0 * 8) | VERA::INC0
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sta VERA::ADDR
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stx VERA::ADDR+1
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sty VERA::ADDR+2
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rts
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; --------------------------------------------------------------------------
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; Hide the mouse pointer.
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hide: jsr msprite
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lda VERA::DATA0
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and #<~VERA::SPRITE::DEPTH::LAYER1
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sta VERA::DATA0
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rts
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; --------------------------------------------------------------------------
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; Show the mouse pointer.
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show: jsr msprite
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lda VERA::DATA0
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ora #VERA::SPRITE::DEPTH::LAYER1
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sta VERA::DATA0
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rts
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; --------------------------------------------------------------------------
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; Prepare to move the mouse pointer.
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prep: ; Fall through
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; --------------------------------------------------------------------------
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; Draw the mouse pointer.
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draw: ; Fall through
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; --------------------------------------------------------------------------
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; Move the mouse pointer X position to the value in .XA .
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movex: ; Already set by drivers
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; Fall through
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; --------------------------------------------------------------------------
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; Move the mouse pointer Y position to the value in .XA .
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movey: rts ; Already set by drivers
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; --------------------------------------------------------------------------
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; Callback structure
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.rodata
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_mouse_def_callbacks:
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.addr hide
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.addr show
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.addr prep
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.addr draw
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.addr movex
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.addr movey
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