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51 lines
1.6 KiB
Plaintext
51 lines
1.6 KiB
Plaintext
;Mouse Control Assembly Language Routines for Commander x16 computer
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SUBROUTINE _MOUSE
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;Mouse Mode Constants for MCNFG Routine
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MHIDE EQU $00 ;Hide Mouse
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MSHOW EQU $01 ;Show Mouse
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MCSTM EQU $FF ;Show Mouse - Custom Sprite
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;Mouse Button Bitmasks
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MBLEFT EQU $01 ;Left Mouse Button
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MBMIDL EQU $04 ;Middle Mouse Button
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MBRGHT EQU $02 ;Right Mouse Button
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;Mouse Scaling Constants
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;Specific to the X16
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MSNONE EQU $00 ;Do Not Change Resolution
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MSLOW EQU $01 ;Low Resolution (320x240)
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MSHIGH EQU $02 ;High Resolution (640x480)
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;Mouse Status Variables
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MOUSEX EQU $02 ;Mouse X Position (ABI Register R0)
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MOUSEY EQU $04 ;Mouse Y Position (ABI Register R1)
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MOUSEB EQU $06 ;Mouse Button Status (ABI Register R2L)
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;mcnfg(mode) - Configure Mouse
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;Args: A = Mode
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;Affects: X,Y
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;Returns: A = Result Code: $00 = Success
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MCNFG: LDX #MSLOW ;Set Scale for 320x240 Screen
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MCNFGS: JSR $FF68 ;Kernal mouse_config Routine
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LDA #0 ;Return Success
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RTS
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;mread() - Read Mouse
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;Sets: MOUSEX, MOUSEY, MOUSEB
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;Affects: X
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;Returns: A = Result Code: $00 = Success
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MREAD: LDX #MOUSEX ;Set Data Address
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JSR $FF6B ;Execute Kernal mouse_get Routine
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STA MOUSEB ;Store Mouse Button Status
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LDA #0 ;Return Success
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RTS
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;mscan() - Scan Mouse
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;Retrieves mouse state for subsequent mread()
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;This is called during the default interrupt
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;handler so should only be called if the interrupt
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;routine is entirey replaced.
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MSCAN EQU $FF71 ;Aliased to Kernal mouse_scan routine
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