mirror of
https://github.com/Pecusx/scorch_src.git
synced 2026-05-20 22:33:43 +02:00
Pecusx
185 lines
3.6 KiB
NASM
185 lines
3.6 KiB
NASM
;-------------------------------------
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.MACRO ROLW
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ROL :1
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ROL :1+1
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.ENDM
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;-------------------------------------
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.MACRO ASLW
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ASL :1
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ROL :1+1
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.ENDM
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;-------------------------------------
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.MACRO RORW
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ROR :1+1
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ROR :1
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.ENDM
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;-------------------------------------
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.MACRO LSRW
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LSR :1+1
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ROR :1
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.ENDM
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;-------------------------------------
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.MACRO VMAIN
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; VMAIN #WORD,interrupt.vector
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; interrupt.vector:
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; 0 - VIMIRQ
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; 1 - TIMCNT1
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; 2 - TIMCNT2
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; 3 - TIMCNT3
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; 4 - TIMCNT4
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; 5 - TIMCNT5
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; 6 - VVBLKI
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; 7 - VVBLKD
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; 8 - TIMVEC1
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; 9 - TIMVEC2
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; Initialises Vertical Blank Interrupts
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; (works only with system interrupts ON)
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LDY # <:1
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LDX # >:1
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LDA #:2
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JSR SETVBV
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.ENDM
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;-------------------------------------
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.MACRO VDLI
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; VDLI #WORD
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; Initialises Display List Interrupts
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LDA #$00
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STA NMIEN
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LDA #$C0
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LDY # <:1
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LDX # >:1
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STY $0200
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STX $0201
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STA NMIEN
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.ENDM
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;-------------------------------------
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.MACRO VDL
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; VDL #WORD
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; Changes Display List addres
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; and sets width of the screen
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; vdl dl,$01 - narrow screen (32 bytes)
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; vdl dl,$02 - normal screen (40 bytes)
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; vdl dl,$03 - wide screen (48 bytes)
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; (works only with system interrupts ON)
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.if %0=2
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lda dmactls
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and #$fc
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ora #%2
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sta dmactls
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.endif
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LDA # <%1
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STA DLPTRS
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LDA # >%1
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STA DLPTRS+1
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.ENDM
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;-------------------------------------
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.MACRO halt
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?stop
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lda RANDOM
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and #$05
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sta COLBAK
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jmp ?stop
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.ENDM
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;-------------------------------------
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.MACRO KEY
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; KEY
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; waits for releasing and pressing "any key"
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PHA
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?CK1 LDA SKSTAT
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AND #$04
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BEQ ?CK1
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?CK LDA SKSTAT
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AND #$04
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BNE ?CK
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PLA
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.ENDM
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;-------------------------------------
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.MACRO WAIT
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; WAIT
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; waits one frame (1/50 s(PAL) or 1/60s(NTSC))
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?ze LDA VCOUNT
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cmp #16 ; if line<16 then wait for line>15 (long VBI protection)
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bcc ?ze
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sbc #10 ; last lines correction
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?wa cmp VCOUNT
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bcc ?wa
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?wf cmp VCOUNT
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bcs ?wf
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.ENDM
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;-------------------------------------
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.macro waitRTC
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lda RTCLOK+2
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?wa cmp RTCLOK+2
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beq ?wa
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.endm
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;-------------------------------------
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.macro negw
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; negate the given word (0-a)
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;-------------------------------------
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sec
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lda #$00
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sbc :1
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sta :1
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lda #$00
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sbc :1+1
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sta :1+1
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.endm
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;-------------------------------------
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.macro randomize
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;usage: randomize floor ceiling
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;returns (in A) a random .byte between "floor" and "ceiling"
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.if :2 < :1
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.error "floor higher than ceiling"
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.endif
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?rand
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lda random
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cmp #:2+1-:1 ;ceiling
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bcs ?rand
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.if %1>0 ; if floor = 0 - no add offset
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adc #:1
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.endif
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.endm
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;-------------------------------------
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.macro phx
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txa
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pha
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.endm
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;-------------------------------------
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.macro phy
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tya
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pha
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.endm
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;-------------------------------------
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.macro plx
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pla
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tax
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.endm
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;-------------------------------------
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.macro ply
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pla
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tay
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.endm
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;-------------------------------------
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.macro txy
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txa
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tay
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.endm
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;-------------------------------------
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.macro tyx
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tya
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tax
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.endm
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;-------------------------------------
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.macro pause
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;waits :1 number (byte) of frames
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ldx #:1
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?PAUSELOOP
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wait
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dex
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bne ?PAUSELOOP
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.ENDM
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