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Mouse driver implementation
git-svn-id: svn://svn.cc65.org/cc65/trunk@2957 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz
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@ -37,11 +37,6 @@ HEADER:
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.addr IOCTL
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.addr IRQ
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; Data that is visible to the outside. Initialized by the kernel.
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XPos: .word 0 ; Current mouse position, X
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YPos: .word 0 ; Current mouse position, Y
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; Callback table, set by the kernel before INSTALL is called
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CHIDE: jmp $0000 ; Hide the cursor
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@ -57,9 +52,8 @@ SCREEN_HEIGHT = 200
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SCREEN_WIDTH = 320
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;----------------------------------------------------------------------------
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;
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; Global variables
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;
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; Global variables. The bounding box values are sorted so that they can be
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; written with the least effort in the BOX routine, so don't reorder them.
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.bss
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@ -67,10 +61,12 @@ Vars:
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OldPotX: .res 1 ; Old hw counter values
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OldPotY: .res 1
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XMin: .res 2 ; X1 value of bounding box
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YMin: .res 2 ; Y1 value of bounding box
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XMax: .res 2 ; X2 value of bounding box
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YPos: .res 2 ; Current mouse position, Y
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XPos: .res 2 ; Current mouse position, X
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YMax: .res 2 ; Y2 value of bounding box
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XMax: .res 2 ; X2 value of bounding box
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YMin: .res 2 ; Y1 value of bounding box
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XMin: .res 2 ; X1 value of bounding box
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OldValue: .res 1 ; Temp for MoveCheck routine
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NewValue: .res 1 ; Temp for MoveCheck routine
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@ -81,9 +77,12 @@ NewValue: .res 1 ; Temp for MoveCheck routine
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.proc DefVars
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.byte 0, 0 ; OldPotX/OldPotY
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.word 0, 0 ; XMin/YMin
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.word SCREEN_WIDTH ; XMax
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.word SCREEN_HEIGHT/2 ; YPos
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.word SCREEN_WIDTH/2 ; XPos
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.word SCREEN_HEIGHT ; YMax
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.word SCREEN_WIDTH ; XMax
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.word 0 ; YMin
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.word 0 ; XMin
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.endproc
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.code
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@ -103,18 +102,31 @@ INSTALL:
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dex
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bpl @L1
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; Be sure the mouse cursor is invisible and at the default location. We
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; need to do that here, because our mouse interrupt handler doesn't set the
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; mouse position if it hasn't changed.
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sei
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jsr CHIDE
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lda XPos
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ldx XPos+1
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jsr CMOVEX
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lda YPos
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ldx YPos+1
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jsr CMOVEY
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cli
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; Done, return zero (= MOUSE_ERR_OK)
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inx ; X = 0
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ldx #$00
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txa
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; rts ; Run into UNINSTALL instead
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rts ; Run into UNINSTALL instead
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;----------------------------------------------------------------------------
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; UNINSTALL routine. Is called before the driver is removed from memory.
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; No return code required (the driver is removed from memory on return).
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UNINSTALL:
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rts
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UNINSTALL = HIDE ; Hide cursor on exit
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;----------------------------------------------------------------------------
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; HIDE routine. Is called to hide the mouse pointer. The mouse kernel manages
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@ -123,7 +135,10 @@ UNINSTALL:
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; no special action is required besides hiding the mouse cursor.
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; No return code required.
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HIDE = CHIDE
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HIDE: sei
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jsr CHIDE
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cli
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rts
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;----------------------------------------------------------------------------
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; SHOW routine. Is called to show the mouse pointer. The mouse kernel manages
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@ -132,15 +147,31 @@ HIDE = CHIDE
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; no special action is required besides enabling the mouse cursor.
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; No return code required.
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SHOW = CSHOW
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SHOW: sei
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jsr CSHOW
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cli
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rts
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;----------------------------------------------------------------------------
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; BOX: Set the mouse bounding box. No checks are done if the mouse is
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; currently inside the box, this is the job of the caller. It is not necessary
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; to validate the parameters, trust the caller and save some code here.
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; No return code required.
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; BOX: Set the mouse bounding box. The parameters are passed as they come from
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; the C program, that is, maxy in a/x and the other parameters on the stack.
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; The C wrapper will remove the parameters from the stack when the driver
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; routine returns.
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; No checks are done if the mouse is currently inside the box, this is the job
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; of the caller. It is not necessary to validate the parameters, trust the
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; caller and save some code here. No return code required.
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BOX:
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BOX: ldy #5
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sei
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sta YMax
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stx YMax+1
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@L1: lda (sp),y
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sta XMax,y
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dey
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bpl @L1
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cli
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rts
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;----------------------------------------------------------------------------
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@ -243,8 +274,7 @@ IRQ: lda SID_ADConv1 ; Get mouse X movement
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; Skip processing if nothing has changed
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tay
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beq @SkipX
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bcc @SkipX
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; Calculate the new X coordinate (--> a/y)
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@ -275,19 +305,18 @@ IRQ: lda SID_ADConv1 ; Get mouse X movement
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; Move the mouse pointer to the new X pos
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tya
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jsr CMOVEY
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jsr CMOVEX
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; Calculate the Y movement vector
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@SkipX: lda SID_ADConv2 ; Get mouse Y movement
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ldy OldPotY
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jsr MoveCheck ; Calculate movement
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sty OldPotY
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ldy OldPotY
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jsr MoveCheck ; Calculate movement
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sty OldPotY
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; Skip processing if nothing has changed
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tay
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beq @SkipY
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bcc @SkipY
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; Calculate the new Y coordinate (--> a/y)
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@ -303,8 +332,8 @@ IRQ: lda SID_ADConv1 ; Get mouse X movement
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; Limit the Y coordinate to the bounding box
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cpy YMin
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sbc YMin+1
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bpl @L3
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sbc YMin+1
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bpl @L3
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ldy YMin
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ldx YMin+1
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jmp @L4
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@ -316,12 +345,12 @@ IRQ: lda SID_ADConv1 ; Get mouse X movement
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ldy YMax
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ldx YMax+1
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@L4: sty YPos
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stx YPos+1
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stx YPos+1
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; Move the mouse pointer to the new X pos
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tya
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jsr CMOVEX
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jmp CMOVEY
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; Done
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@ -342,24 +371,27 @@ MoveCheck:
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sta NewValue
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ldx #$00
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sub OldValue ; a = mod64 (new - old)
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sub OldValue ; a = mod64 (new - old)
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and #%01111111
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cmp #%01000000 ; if (a > 0)
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bcs @L1 ;
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lsr a ; a /= 2;
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beq @L2 ; if (a != 0)
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ldy NewValue ; y = NewValue
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rts ; return
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cmp #%01000000 ; if (a > 0)
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bcs @L1 ;
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lsr a ; a /= 2;
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beq @L2 ; if (a != 0)
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ldy NewValue ; y = NewValue
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sec
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rts ; return
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@L1: ora #%11000000 ; else or in high order bits
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cmp #$FF ; if (a != -1)
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@L1: ora #%11000000 ; else or in high order bits
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cmp #$FF ; if (a != -1)
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beq @L2
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sec
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ror a ; a /= 2
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dex ; high byte = -1 (X = $FF)
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ror a ; a /= 2
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dex ; high byte = -1 (X = $FF)
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ldy NewValue
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sec
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rts
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@L2: txa ; A = $00
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@L2: txa ; A = $00
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clc
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rts
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@ -2,6 +2,9 @@
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; Default mouse callbacks for the C64
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;
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; Ullrich von Bassewitz, 2004-03-20
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;
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; All functions in this module should be interrupt safe, because they may
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; be called from an interrupt handler
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;
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.export _mouse_def_callbacks
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@ -9,6 +12,7 @@
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.include "mouse-kernel.inc"
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.include "c64.inc"
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.macpack generic
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; Sprite definitions. The first value can be changed to adjust the number
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; of the sprite used for the mouse.
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@ -18,71 +22,74 @@ MOUSE_SPR_NMASK = .lobyte(.not MOUSE_SPR_MASK) ; Negative mask
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VIC_SPR_X = (VIC_SPR0_X + 2*MOUSE_SPR) ; Sprite X register
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VIC_SPR_Y = (VIC_SPR0_Y + 2*MOUSE_SPR) ; Sprite Y register
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.code
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; --------------------------------------------------------------------------
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; Hide the mouse pointer
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; Hide the mouse pointer. Always called with interrupts disabled.
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.proc hide
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lda #MOUSE_SPR_NMASK
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sei
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and VIC_SPR_ENA
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sta VIC_SPR_ENA
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cli
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rts
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.endproc
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; --------------------------------------------------------------------------
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; Show the mouse pointer
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; Show the mouse pointer. Always called with interrupts disabled.
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.proc show
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lda #MOUSE_SPR_MASK
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sei
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ora VIC_SPR_ENA
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sta VIC_SPR_ENA
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cli
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rts
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.endproc
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; --------------------------------------------------------------------------
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; Move the mouse pointer X position to the value in a/x
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; Move the mouse pointer X position to the value in a/x. Always called with
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; interrupts disabled.
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.proc movex
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; Set the low byte, this frees A
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; Add the X correction and set the low byte. This frees A.
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add #24 ; X correction
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sta VIC_SPR_X
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; Set the high byte
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txa ; Test high byte of X coord
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bne @L1
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sei
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txa
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adc #0
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bne @L1 ; Branch if high byte not zero
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lda VIC_SPR_HI_X ; Get high X bits of all sprites
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and #MOUSE_SPR_NMASK ; Clear high bit for sprite
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sta VIC_SPR_HI_X
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cli
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rts
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@L1: sei
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lda VIC_SPR_HI_X ; Get high X bits of all sprites
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ora #MOUSE_SPR_NMASK ; Set high bit for sprite
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@L1: lda VIC_SPR_HI_X ; Get high X bits of all sprites
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ora #MOUSE_SPR_MASK ; Set high bit for sprite
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sta VIC_SPR_HI_X
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cli
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rts
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.endproc
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; --------------------------------------------------------------------------
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; Move the mouse pointer Y position to the value in a/x
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; Move the mouse pointer Y position to the value in a/x. Always called with
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; interrupts disabled.
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.proc movey
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clc
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ldx PALFLAG
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bne @L1
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adc #50 ; FIXME: Should be NTSC, is PAL value
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sta VIC_SPR_Y ; Set Y position
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rts
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@L1: adc #50 ; Add PAL correction
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sta VIC_SPR_Y ; Set Y position
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rts
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@ -100,4 +107,3 @@ _mouse_def_callbacks:
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.addr movey
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