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Updated the mouse module

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git-svn-id: svn://svn.cc65.org/cc65/trunk@440 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz 2000-11-16 23:50:38 +00:00
parent 8f6b114bb8
commit df52e29196
1 changed files with 33 additions and 13 deletions
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46
libsrc/c64/mouse.s
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@ -9,8 +9,9 @@
.export _mouse_hide, _mouse_show
.export _mouse_box, _mouse_info
.export _mouse_x, _mouse_y
.export _mouse_move
.export _mouse_move, _mouse_buttons
.import _readjoy
.import popa, popsreg, addysp1
.importzp sp, sreg
@ -22,7 +23,9 @@
; --------------------------------------------------------------------------
;
; void __fastcall__ mouse_init (unsigned char port, unsigned char sprite, unsigned char type);
; unsigned char __fastcall__ mouse_init (unsigned char port,
; unsigned char sprite,
; unsigned char type);
;
_mouse_init:
@ -31,7 +34,7 @@ _mouse_init:
jsr popa ; Get the port number
ldy OldIRQ+1 ; Already initialized?
bne Done ; Jump if yes
bne AlreadyInitialized ; Jump if yes
stx MouseSprite ; Remember the sprite number
sta MousePort ; Remember the port number
@ -66,11 +69,18 @@ _mouse_init:
lda IRQVec+1
sta OldIRQ+1
; Set our own IRQ vector
; Set our own IRQ vector. We cheat here to save a few bytes of code:
; The function is expected to return a value not equal to zero on success,
; and since we know that the high byte of the IRQ handler address is never
; zweo, we will return just this byte.
lda #<MouseIRQ
ldx #>MouseIRQ
bne SetIRQ
ldx #<MouseIRQ
lda #>MouseIRQ
bne SetIRQ ; Branch always
AlreadyInitialized:
lda #0 ; Error
rts
; --------------------------------------------------------------------------
;
@ -78,14 +88,14 @@ _mouse_init:
;
_mouse_done:
lda OldIRQ ; Initialized?
ldx OldIRQ+1
beq Done ; Jump if no
ldx OldIRQ ; Initialized?
lda OldIRQ+1
beq Done ; Jump if no
ldy #0
sty OldIRQ+1 ; Reset the initialized flag
SetIRQ: sei ; Disable interrupts
sta IRQVec ; Set the new/old vector
stx IRQVec+1
stx IRQVec ; Set the new/old vector
sta IRQVec+1
cli ; Enable interrupts
Done: rts
@ -229,6 +239,16 @@ _mouse_move:
@L9: cli ; Enable interrupts
rts
; --------------------------------------------------------------------------
;
; unsigned char mouse_buttons (void);
;
_mouse_buttons:
lda MousePort ; Get the port
jmp _readjoy ; Same as joystick
; --------------------------------------------------------------------------
;
; Mouse interrupt handler