2018-12-12 20:38:30 +00:00
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;=====================================
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; XMAS2018 -- Merry Christmas Part
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;=====================================
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merry:
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;===================
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; init screen
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;===================
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; init vars
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lda #15
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sta XPOS
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lda #38
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sta YPOS
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lda #0
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sta FRAME
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sta FRAMEH
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;=============================
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; Load graphic hgr
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2018-12-13 22:15:39 +00:00
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; lda #<merry_hgr
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; sta LZ4_SRC
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; lda #>merry_hgr
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; sta LZ4_SRC+1
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; lda #<(merry_hgr_end-8) ; skip checksum at end
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; sta LZ4_END
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; lda #>(merry_hgr_end-8) ; skip checksum at end
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; sta LZ4_END+1
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; lda #<$2000
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; sta LZ4_DST
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; lda #>$2000
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; sta LZ4_DST+1
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; jsr lz4_decode
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2018-12-12 20:38:30 +00:00
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;==============================
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; setup graphics for vapor lock
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;==============================
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jsr vapor_lock ; 6
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; vapor lock returns with us at beginning of hsync in line
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; 114 (7410 cycles), so with 5070 lines to go
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; so we have 5070 + 4550 = 9620 to kill
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; FIXME: clear page0/page1 screens
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; jsr gr_copy_to_current ; 6+ 9292
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; now we have 322 left
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; GR part
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; bit HIRES ; 4
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bit SET_GR ; 4
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bit FULLGR ; 4
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; 9620
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; -8 mode set
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; - 3 for jmp
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;=======
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; 9609
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; Try X=239 Y=8 cycles=9609
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ldy #8 ; 2
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meloopA:ldx #239 ; 2
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meloopB:dex ; 2
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bne meloopB ; 2nt/3
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dey ; 2
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bne meloopA ; 2nt/3
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jmp merry_begin_loop
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.align $100
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;================================================
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; Merry Christmas Loop
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;================================================
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; each scan line 65 cycles
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; 1 cycle each byte (40cycles) + 25 for horizontal
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; Total of 12480 cycles to draw screen
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; Vertical blank = 4550 cycles (70 scan lines)
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; Total of 17030 cycles to get back to where was
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merry_begin_loop:
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merry_display_loop:
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; (40*65)-4 = 2596
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; 40 lines of LORES
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bit LORES ; 4
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; Try X=42 Y=12 cycles=2593 R3
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lda $0 ; nop ; 3
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ldy #12 ; 2
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meloopC:ldx #42 ; 2
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meloopD:dex ; 2
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bne meloopD ; 2nt/3
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dey ; 2
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bne meloopC ; 2nt/3
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; rest of screen is hires page0
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; (152*65)-4 = 9876
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bit HIRES ; 4
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; Try X=13 Y=139 cycles=9870 R6
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nop
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nop
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nop
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ldy #139 ; 2
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meloopE:ldx #13 ; 2
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meloopF:dex ; 2
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bne meloopF ; 2nt/3
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dey ; 2
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bne meloopE ; 2nt/3
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;======================================================
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; We have 4550 cycles in the vblank, use them wisely
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;======================================================
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; do_nothing should be 4550
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; -10 keypress
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; ===========
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; 4540
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; jsr play_music ; 6+1032
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; Try X=9 Y=89 cycles=4540
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ldy #89 ; 2
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meloop1:ldx #9 ; 2
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meloop2:dex ; 2
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bne meloop2 ; 2nt/3
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dey ; 2
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bne meloop1 ; 2nt/3
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; no keypress = 10+(24) = 34
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lda KEYPRESS ; 4
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bpl me_no_keypress ; 3
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; -1
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jmp me_handle_keypress ; 3
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me_no_keypress:
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jmp merry_display_loop ; 3
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me_handle_keypress:
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bit KEYRESET ; clear keypress ; 4
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rts ; 6
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