;===================================== ; XMAS2018 -- Merry Christmas Part ;===================================== merry: ;=================== ; init screen ;=================== ; init vars lda #15 sta XPOS lda #38 sta YPOS lda #0 sta FRAME sta FRAMEH ;============================= ; Load graphic hgr -- already loaded at $6000 ;============================== ; setup graphics for vapor lock ;============================== jsr vapor_lock ; 6 ; vapor lock returns with us at beginning of hsync in line ; 114 (7410 cycles), so with 5070 lines to go ; so we have 5070 + 4550 = 9620 to kill ; FIXME: clear page0/page1 screens ; jsr gr_copy_to_current ; 6+ 9292 ; now we have 322 left ; GR part bit HIRES ; 4 bit SET_GR ; 4 bit FULLGR ; 4 bit PAGE1 ; 4 ; 9620 ; -12 mode set ; - 3 for jmp ;======= ; 9605 ; Try X=136 Y=14 cycles=9605 ldy #14 ; 2 meloopA:ldx #136 ; 2 meloopB:dex ; 2 bne meloopB ; 2nt/3 dey ; 2 bne meloopA ; 2nt/3 jmp merry_begin_loop .align $100 ;================================================ ; Merry Christmas Loop ;================================================ ; each scan line 65 cycles ; 1 cycle each byte (40cycles) + 25 for horizontal ; Total of 12480 cycles to draw screen ; Vertical blank = 4550 cycles (70 scan lines) ; Total of 17030 cycles to get back to where was merry_begin_loop: merry_display_loop: ; 192 lines of hires page1 ; (192*65) = 12480 ; Try X=24 Y=99 cycles=12475 R5 lda $0 nop ldy #99 ; 2 meloopE:ldx #24 ; 2 meloopF:dex ; 2 bne meloopF ; 2nt/3 dey ; 2 bne meloopE ; 2nt/3 ;====================================================== ; We have 4550 cycles in the vblank, use them wisely ;====================================================== ; do_nothing should be 4550 ; -10 keypress ; =========== ; 4540 ; jsr play_music ; 6+1032 lda #$00 sta scroll_hgr_smc+1 jsr scroll_hgr_left lda #$28 sta scroll_hgr_smc+1 jsr scroll_hgr_left lda #$50 sta scroll_hgr_smc+1 jsr scroll_hgr_left ; Try X=9 Y=89 cycles=4540 ldy #89 ; 2 meloop1:ldx #9 ; 2 meloop2:dex ; 2 bne meloop2 ; 2nt/3 dey ; 2 bne meloop1 ; 2nt/3 ; no keypress = 10+(24) = 34 bit KEYRESET ; clear keypress ; 4 me_keyloop: lda KEYPRESS ; 4 bpl me_keyloop ; 3 ; -1 ; jmp me_handle_keypress ; 3 me_no_keypress: ; jmp merry_display_loop ; 3 me_handle_keypress: bit KEYRESET ; clear keypress ; 4 rts ; 6 ; 0 1 2 3 4 5 6 7 ; 00 = $2000 $2400 $2800 $2c00 $3000 $3400 $3800 $3c00 ; 08 = $2080 $2480 $2880 $2c80 $3080 $3480 $3880 $3c80 ; 16 = $2100 $2500 $2900 $2d00 $3100 $3500 $3900 $3d00 ; 24 = $2180 $2580 $2980 $2d80 $3180 $3580 $3980 $3d80 ; 32 = $2200 $2600 $2a00 $2e00 $3200 $3600 $3a00 $3e00 ; 40 = $2280 $2680 $2a80 $2e80 $3280 $3680 $3a80 $3e80 ; 48 = $2300 $2700 $2b00 $2f00 $3300 $3700 $3b00 $3f00 ; 56 = $2380 $2780 $2b80 $2f80 $3380 $3780 $3b80 $3f80 ; ----- ; 64 = $2028 $2428 $2828 $2c28 $3028 $3428 $3828 $3c28 ; 72 = $20a8 $24a8 $28a8 $2ca8 $30a8 $34a8 $38a8 $3ca8 ; 80 = $2128 $2528 $2928 $2d28 $3128 $3528 $3928 $3d28 ; 88 = $21a8 $25a8 $29a8 $2da8 $31a8 $35a8 $39a8 $3da8 ; 96 = $2228 $2628 $2a28 $2e28 $3228 $3628 $3a28 $3e28 ; 104 = $22a8 $26a8 $2aa8 $2ea8 $32a8 $36a8 $3aa8 $3ea8 ; 112 = $2328 $2728 $2b28 $2f28 $3328 $3728 $3b28 $3f28 ; 120 = $23a8 $27a8 $2ba8 $2fa8 $33a8 $37a8 $3ba8 $3fa8 ; ----- ; 128 = $2050 $2450 $2850 $2c50 $3050 $3450 $3850 $3c50 ; 136 = $20d0 $24d0 $28d0 $2cd0 $30d0 $34d0 $38d0 $3cd0 ; 144 = $2150 $2550 $2950 $2d50 $3150 $3550 $3950 $3d50 ; 152 = $21d0 $25d0 $29d0 $2dd0 $31d0 $35d0 $39d0 $3dd0 ; 160 = $2250 $2650 $2a50 $2e50 $3250 $3650 $3a50 $3e50 ; 168 = $22d0 $26d0 $2ad0 $2ed0 $32d0 $36d0 $3ad0 $3ed0 ; 176 = $2350 $2750 $2b50 $2f50 $3350 $3750 $3b50 $3f50 ; 184 = $23d0 $27d0 $2bd0 $2fd0 $33d0 $37d0 $3bd0 $3fd0 ; ----- ; int count=0; HIGH = $00 CURRENT = $01 NEXT = $02 COUNTH = $03 COUNTL = $04 ;=========================================== ;=========================================== ;=========================================== ; Scroll HGR Left ; ; very slowly scroll screen left, 1/3 of screen at a time ; scrolls page pointed to by INL:INH into OUTL:OUTH ; Timing ; scroll_hgr_left: 8 ; 140* scroll_hgr_loop: 13 setup ; 64*left_one_loop 30+2*??? ; 41 (increments) ; 29 increment counts ; 10 check and loop ; 5 return ; total time = 13 + 140*(13+29+10+64*(41+30+2*(3727))) ; original time = 67,431,293 cycles = roughly 67s scroll_hgr_left: lda #$0 ; 2 sta COUNTH ; 3 sta COUNTL ; 3 ;=========== ; 8 scroll_hgr_loop: lda #$40 ; 2 sta OUTH ; 3 lda #$60 ; 2 sta INH ; 3 scroll_hgr_smc: lda #$0 ; 2 sta INL ; 3 sta OUTL ; 3 ;============ ; 13 ; repeats 64 times, once for east hline of 1/3 the screen left_one_loop: ; scroll first page jsr hgr_scroll_line ; 6+??? ; scroll second page lda OUTH ; 3 sta TEMP ; 3 lda INH ; 3 sta OUTH ; 3 jsr hgr_scroll_line ; 6+??? ; restore pointers lda TEMP ; 3 sta OUTH ; 3 ;============ ; 30+2*??? clc ; 2 lda INL ; 3 adc #$80 ; 2 sta INL ; 3 lda INH ; 3 adc #$0 ; 2 sta INH ; 3 clc ; needed? ; 2 lda OUTL ; 3 adc #$80 ; 2 sta OUTL ; 3 lda OUTH ; 3 adc #$0 ; 2 sta OUTH ; 3 cmp #$60 ; 2 bne left_one_loop ; 3 ;========== ; 41 ; -1 lda KEYPRESS ; 4 bmi scroll_done ; 3 inc COUNTL ; 5 lda COUNTL ; 3 cmp #7 ; 2 bne scroll_noinc_counth ; 3 lda #0 ; 2 sta COUNTL ; 3 inc COUNTH ; 5 ;=========== ; 29 scroll_noinc_counth: lda COUNTH ; 3 cmp #20 ; 2 beq scroll_done ; 3 ;-1 jmp scroll_hgr_loop ; 3 ;========== ; 10 scroll_done: rts ; 6 ;=========================================== ; hgr_scroll_line ;=========================================== ; ; 2 init ; 40* ; hgr_scroll_line_loop: 25 ; high bit 20 ; prepare bits: 16 ; output new byte: 21 ; increment and loop: 7 ; 5 return ; ; (93*40)+7=3727 -- original total ; (91*40)+7=3647 -- remove branch in highbit code ; (89*40)+7=3567 -- convert 5 asl to 4 ror hgr_scroll_line: ldy #0 ; 2 ;=========== ; 2 hgr_scroll_line_loop: lda (OUTL),Y ; get pixel block of interest ; 5 sta CURRENT ; 3 cpy #39 ; 2 bne not_thirtynine ; 3 thirtynine: ; -1 sty TEMPY ; save Y ; 3 ldy #0 ; 2 lda (INL),Y ; 5 ldy TEMPY ; restore Y ; 3 jmp done_thirtynine ; 3 not_thirtynine: iny ; 2 lda (OUTL),Y ; get subsequent pixel block ; 5 dey ; 2 done_thirtynine: sta NEXT ; 3 ;=================== ; usually: 25 ; rarely: 31 ; if in bit 2 or 6 of horiz scroll, shift the color bit over ; makes some color flicker, is there a better way? high_bit: lda COUNTL ; 3 and #$3 ; 2 cmp #2 ; 2 bne keep_high_bit ; 3 move_high_bit: ; -1 lda NEXT ; 3 jmp done_high_bit ; 3 keep_high_bit: lda CURRENT ; 3 done_high_bit: and #$80 ; 2 sta HIGH ; 3 ;=================== ; 2or6: 20 ; else: 18 prepare_bits: ; get right byte, bottom 2 bits, shifted left to be in 6+5 lda NEXT ; 3 ; this method 2 cycles faster than asl x 5 ror ; 2 ror ; 2 ror ; 2 ror ; 2 and #$60 ; 2 sta NEXT ; 3 ;========== ; 16 output_new: ; get current, mask off bottom 2 bits (no longer needed) ; then OR in the saved high (color) bit as well as NEXT bits lda CURRENT ; 3 lsr ; 2 lsr ; 2 and #$1f ; 2 ora HIGH ; 3 ora NEXT ; 3 sta (OUTL),Y ; 6 ;=========== ; 21 iny ; 2 cpy #40 ; 2 bne hgr_scroll_line_loop ; 3 ;=========== ; 7 ; -1 rts ; 6