147 lines
2.1 KiB
Plaintext
147 lines
2.1 KiB
Plaintext
.text
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#include "memmap.i65"
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hiprint:
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rep #$30 : .xl : .al
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lda !print_x
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and #$00ff
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lsr
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bcs print_bg1
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ldx #!BG1_TILE_BUF ; for 2nd loop
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phx
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ldx #!BG2_TILE_BUF ; for 1st loop
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phx
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bra print_bg_cont
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print_bg1
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ldx #!BG2_TILE_BUF+2 ; for 2nd loop
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phx
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ldx #!BG1_TILE_BUF ; for 1st loop da whoop
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phx
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bra print_bg_cont
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print_bg_cont
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sta !print_x
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lda !print_y
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and #$00ff
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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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clc
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adc !print_x
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asl ; double the offset for WRAM addressing
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tay ; zonday
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plx
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phy ; offset from tilemap start
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stx !print_x
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clc
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adc !print_x
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; we need to transfer to WRAM and from there to VRAM via DMA during VBLANK
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; because VRAM can only be accessed during VBLANK and forced blanking.
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sta $2181
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sep #$20 : .as
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lda #$7f ;we really only need bit 0. full bank given for clarity
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sta $2183
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print_loop
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ldx !print_src
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lda !print_bank
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pha
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plb
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phx ; source addr
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print_loop_inner
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lda !0,x
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asl
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sta @$2180
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lda #$00
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adc #$00
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sta @$2180
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inx
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lda !0,x
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beq print_loop2
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inx
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lda !0,x
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beq print_loop2
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bra print_loop_inner
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print_loop2
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lda #$00
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pha
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plb
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rep #$30 : .al : .xl
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ply ; source addr
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iny
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pla ; offset from tilemap start
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plx ; other tilemap addr
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stx !print_x
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clc
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adc print_x ; tilemap+offset
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sta $2181
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tyx
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sep #$20 : .as
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lda print_bank
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pha
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plb
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print_loop2_inner
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lda !0,x
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asl
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sta @$2180
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lda #$00
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adc #$00
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sta @$2180
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inx
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lda !0,x
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beq print_end
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inx
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lda !0,x
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beq print_end
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bra print_loop2_inner
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print_end
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lda #$00
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pha
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plb
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rts
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loprint:
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rep #$30 : .xl : .al
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lda !print_x
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and #$00ff
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asl ;double the offset for WRAM addressing
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clc
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adc #!BG2_TILE_BUF
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sta !print_x
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lda !print_y
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and #$00ff
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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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asl ;double the offset for WRAM addressing
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clc
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adc !print_x
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; we need to transfer to WRAM and from there to VRAM via DMA during VBLANK
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; because VRAM can only be accessed during VBLANK and forced blanking.
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sta $2181
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sep #$20 : .as
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lda #$7f ;we really only need bit 0. full bank given for clarity
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sta $2183
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ldx !print_src
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lda !print_bank
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pha
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plb
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loprint_loop_inner
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lda !0,x
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beq loprint_end
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sta @$2180
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lda #$00
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adc #$00
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ora #$20
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sta @$2180
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inx
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bra loprint_loop_inner
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loprint_end
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lda #$00
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pha
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plb
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rts
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