165 lines
4.1 KiB
ArmAsm
165 lines
4.1 KiB
ArmAsm
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; slowColorFill
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; Fills the screen with a color (or two). Slow because it has to run from
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; bank 0 on the slow graphics path
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;
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; A = 4:4:4:4 = Palette entries to fill
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;
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; Trashes X,Y
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slowColorFill:
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ldy #200
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ldx #$2000
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slowColorFillLoop:
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; 80 STAs, for 1 line
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; sta VRAMBANK,x inx inx
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.byte $9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8
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.byte $9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8
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.byte $9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8
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.byte $9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8
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.byte $9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8
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.byte $9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8
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.byte $9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8
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.byte $9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8
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.byte $9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8
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.byte $9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8,$9F,$00,$00,$E1,$e8,$e8
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dey
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beq slowColorFillLoopDone
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jmp slowColorFillLoop
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slowColorFillLoopDone:
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; initSCBs
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; Initialize all scanline control bytes
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;
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; Trashes A,X
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initSCBs:
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lda #0
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ldx #$0100 ;set all $100 scbs to A
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initSCBsLoop:
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dex
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dex
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sta $e19d00,x
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bne initSCBsLoop
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; setScanlinePalette
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; Set the palette for a given scan line
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;
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; PARAML0 = Palette index
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; X = Start scan line
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; Y = Count
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setScanlinePalette:
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pha
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setScanlinePaletteLoop:
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lda $e19d00,x
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ora PARAML0
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sta $e19d00,x
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inx
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dey
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bne setScanlinePaletteLoop
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pla
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; setPalette
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; Set all colors in a palette from memory
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; PARAML0 = Pointer to 32 color bytes
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; A = Palette index
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;
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setPalette:
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SAVE_XY
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asl
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asl
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asl
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asl
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asl
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BITS8A
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sta setPaletteLoop_SMC+1
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BITS16
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ldx #0
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ldy #0
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setPaletteLoop:
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lda (PARAML0),y
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setPaletteLoop_SMC:
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sta $e19e00,x ; Self-modifying code!
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iny
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iny
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inx
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inx
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cpx #32
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bne setPaletteLoop
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RESTORE_XY
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rts
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Vertical blank checkers
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;
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; The Brutal Deluxe version, taken from LemminGS
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;
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nextVBL:
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lda #75
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pha
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nextVBL0:
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lda $e0c02e
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and #$7f
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cmp 1,s
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blt nextVBL0
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cmp #100
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bge nextVBL0
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pla
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waitVBL:
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lda $e0c018
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bpl waitVBL
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rts
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; The Apple version, taken from GS Tech Note 039
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;
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syncVBL:
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;sei
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BITS8
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syncVBL0:
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ldaA $C02f
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asl ; VA is now in the Carry flag
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ldaA $C02e
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rol ; Roll Carry into bit 0
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cmp #200 ; A now contains line number
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blt syncVBL0
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BITS16
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;cli
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rts
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; The old style //e version
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;
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vblSync:
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BITS8
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waitVBLToFinish:
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lda $E0C019
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bmi waitVBLToFinish
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waitVBLToStart:
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lda $E0C019
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bpl waitVBLToStart
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BITS16
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rts
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