221 lines
3.1 KiB
ArmAsm
221 lines
3.1 KiB
ArmAsm
; wires
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;CTEMP = $FC
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;================================
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; Clear screen and setup graphics
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;================================
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wires:
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jsr SETGR ; set lo-res 40x40 mode
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bit SET_GR
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bit LORES
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bit FULLGR ; make it 40x48
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lda #0
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sta FRAME
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jsr wires_create_lookup
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wires_forever_loop:
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jsr wires_cycle_colors
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; set/flip pages
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; we want to flip pages and then draw to the offscreen one
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wire_flip_pages:
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; ldx #0 ; x already 0
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lda wires_draw_page_smc+1 ; DRAW_PAGE
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beq wire_done_page
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inx
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wire_done_page:
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ldy PAGE0,X ; set display page to PAGE1 or PAGE2
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eor #$4 ; flip draw page between $400/$800
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sta wires_draw_page_smc+1 ; DRAW_PAGE
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; plot current frame
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; scan whole 40x48 screen and plot each point based on
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; lookup table colors
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wire_plot_frame:
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ldx #47 ; YY=47 (count backwards)
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wires_plot_yloop:
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txa ; get (y&0xf)<<4
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pha ; save YY / SAVEX
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asl
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asl
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asl
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asl
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sta CTEMP ; save for later
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txa ; get YY in accumulator
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lsr ; call actually wants Ycoord/2
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ldy #$0f ; setup mask for odd/even line
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bcc plot_mask
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ldy #$f0
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plot_mask:
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sty MASK
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jsr GBASCALC ; point GBASL/H to address in (A is ycoord/2)
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; after, A is GBASL, C is clear
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lda GBASH ; adjust to be PAGE1/PAGE2 ($400 or $800)
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wires_draw_page_smc:
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adc #0
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sta GBASH
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;==========
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ldy #39 ; XX = 39 (countdown)
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wires_plot_xloop:
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tya ; get x&0xf
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and #$f
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ora CTEMP ; combine with val from earlier
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; get ((y&0xf)*16)+x
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tax
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wires_plot_lookup:
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wires_plot_lookup_smc:
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lda wires_lookup,X ; load lookup, (y*16)+x
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cmp #11
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bcs color_notblue ; if < 11, blue
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color_blue:
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lda #$11 ; blue offset
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color_notblue:
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tax
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lda wires_colorlookup-11,X ; lookup color
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color_notblack:
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sta COLOR ; each nibble should be same
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jsr PLOT1 ; plot at GBASL,Y (x co-ord goes in Y)
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dey
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bpl wires_plot_xloop
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pla
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tax
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dex
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bpl wires_plot_yloop
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inc FRAME
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lda FRAME
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cmp #$32
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bne wires_forever_loop
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rts
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wires_colorlookup:
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;.byte $22,$22,$22,$22,$22,$22,$22,$22
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;.byte $22,$22,$22,
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.byte $66,$77,$ff,$77,$66,$00,$22
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; make lookup happen at page boundary
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;.align $100
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;.org $d00
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;wires_lookup:
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wires_lookup = $1000
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;===============================
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; wires create lookup
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;===============================
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;
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; we only create a 16x16 texture, which we pattern across 40x48 screen
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wires_create_lookup:
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ldy #15
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wires_create_yloop:
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ldx #15
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wires_create_xloop:
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; vertical
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txa
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and #$7
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bne horiz
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xnot:
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tya
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bne wires_lookup_smc
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horiz:
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; horizontal
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tya
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and #$7
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beq ynot
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lda #$10
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bne wires_lookup_smc
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ynot:
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txa
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wires_lookup_smc:
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sta wires_lookup ; always starts at $d00
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inc wires_lookup_smc+1
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dex
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bpl wires_create_xloop
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dey
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bpl wires_create_yloop
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; X and Y both $FF
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wires_create_lookup_done:
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rts
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;===============================
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; wires cycle colors
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;===============================
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wires_cycle_colors:
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; cycle colors
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; can't do palette rotate on Apple II so faking it here
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; just incrementing every entry in texture by 1
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; X is $FF when arriving here
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; ldx #0
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inx ; make X 0
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cycle_loop:
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ldy wires_lookup,X
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cpy #$10
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beq skip_zero
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iny
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tya
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and #$f
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sta wires_lookup,X
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skip_zero:
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inx
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bne cycle_loop
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rts
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