302 lines
5.5 KiB
ArmAsm
302 lines
5.5 KiB
ArmAsm
; Missing scene
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; Uses the 40x48d page1/page2 every-1-scanline pageflip mode
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; by deater (Vince Weaver) <vince@deater.net>
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missing_intro:
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; we come into this at the very end of vblank
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; we should be playing a frame of music every
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; 17030 - 1243 = 15787 cycles or so
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;===================
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; init vars
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; lda #0
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; sta DRAW_PAGE
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;=============================
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; setup graphics code
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jsr create_update_type1 ; now calls play_frame_compressed
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; setup_rasterbars_page_smc=4
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; lda #0
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; sta setup_rasterbars_page_smc+1
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; setup_rasterbars_offset_smc=2
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lda #2
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sta setup_rasterbars_offset_smc+1
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; setup_rasterbars_bars_start_smc=16
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lda #13
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sta setup_rasterbars_bars_start_smc+1
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; setup_rasterbars_bars_end_smc=48
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lda #48
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sta setup_rasterbars_bars_end_smc+1
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; setup_rasterbars_start_addr1_smc:=#<(UPDATE_START+(13*49))
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lda #<(UPDATE_START+(12*49))
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sta setup_rasterbars_start_addr1_smc+1
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; setup_rasterbars_start_addr2_smc:=#<(UPDATE_START+(13*49))
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lda #>(UPDATE_START+(12*49))
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sta setup_rasterbars_start_addr2_smc+1
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jsr setup_rasterbars
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; setup_rasterbars_page_smc=4
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; lda #0
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; sta setup_rasterbars_page_smc+1
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; setup_rasterbars_offset_smc=2
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lda #2
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sta setup_rasterbars_offset_smc+1
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; setup_rasterbars_bars_start_smc=16
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lda #149
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sta setup_rasterbars_bars_start_smc+1
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; setup_rasterbars_bars_end_smc=48
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lda #187
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sta setup_rasterbars_bars_end_smc+1
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; setup_rasterbars_start_addr1_smc:=#<(UPDATE_START+(149*49))
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lda #<(UPDATE_START+(148*49))
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sta setup_rasterbars_start_addr1_smc+1
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; setup_rasterbars_start_addr2_smc:=#<(UPDATE_START+(149*49))
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lda #>(UPDATE_START+(148*49))
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sta setup_rasterbars_start_addr2_smc+1
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jsr setup_rasterbars
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jsr make_bars
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;=============================
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; Load graphic page0
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lda #<k_low
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sta GBASL
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lda #>k_low
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sta GBASH
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lda #$c ; load to $c00
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jsr load_rle_gr ; 2000
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lda #4
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sta DRAW_PAGE
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jsr gr_copy_to_current ; copy to page1 ; 9292
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; GR part
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bit PAGE1
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bit LORES ; 4
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bit SET_GR ; 4
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bit FULLGR ; 4
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; jsr wait_until_keypressed
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jsr play_frame_compressed
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;=============================
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; Load graphic page1
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lda #<k_high
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sta GBASL
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lda #>k_high
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sta GBASH
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lda #$c
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jsr load_rle_gr ; 2000
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lda #0
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sta DRAW_PAGE
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jsr gr_copy_to_current ; 9292
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; GR part
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bit PAGE0
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; jsr wait_until_keypressed
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jsr play_frame_compressed
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;==============================
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; setup graphics for vapor lock
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;==============================
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jsr vapor_lock
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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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; GR part
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; bit LORES ; 4
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bit SET_GR ; 4
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; bit FULLGR ; 4
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jsr gr_copy_to_current ; 6+ 9292
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; 5070 + 4550 = 9620
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; 9292
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; 12
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; 6
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; ====
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; 310
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; Try X=9 Y=6 cycles=307R3
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lda TEMP
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ldy #6 ; 2
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mloopA: ldx #9 ; 2
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mloopB: dex ; 2
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bne mloopB ; 2nt/3
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dey ; 2
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bne mloopA ; 2nt/3
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; jmp missing_display_loop ; 3
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;.align $100
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;================================================
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; Display 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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; We want to alternate between page1 and page2 every 65 cycles
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; vblank = 4550 cycles to do scrolling
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; want colors 01234567
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; line 0: $X0 to $800
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; line 1: $X1 to $400
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; line 2: $X2
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; line 3: $X3
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; line 4: $4X
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; line 5: $5X
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; line 6: $6X
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; line 7: $7X
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missing_display_loop:
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jsr $9800 ; update_type1
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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
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; 4550
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; -12 jsr/ret to update_type1
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; - 8 check keypress
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; -1243
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;=============
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; 3287
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; blah, current code the tight loops are right at a page boundary
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jsr play_frame_compressed ; 6+1237
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do_nothing_missing:
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; want 3287
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; Try X=163 Y=4 cycles=3285R2
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nop
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ldy #4 ; 2
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gloop1: ldx #163 ; 2
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gloop2: dex ; 2
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bne gloop2 ; 2nt/3
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dey ; 2
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bne gloop1 ; 2nt/3
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lda FRAME_PLAY_PAGE ; 3
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cmp #4 ; 2
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bne missing_display_loop ; 3
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; lda KEYPRESS ; 4
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; bpl missing_display_loop ; 3
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; lda TEMP ; 3
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; nop ; 2
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; jmp missing_display_loop ; 3
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rts
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;BAR_START = 2*8
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BAR_START = (2*8)-3 ; 13
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BAR_START2 = 152-3
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; $9800 + (49*18) + 4 = $9800+886 = $9800+$376=$9b76 (9b72)
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; $9800 + (49*152) = $9800+7448 = $9800+$1d18=$b518
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make_bars:
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lda #<bar_colors_top
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sta INL
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lda #>bar_colors_top
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sta INH
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lda #<(UPDATE_START+49*(BAR_START+2)+4)
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sta OUTL
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lda #>(UPDATE_START+49*(BAR_START+2)+4)
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sta OUTH
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jsr make_bars_entry
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lda #<bar_colors_bottom
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sta INL
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lda #>bar_colors_bottom
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sta INH
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lda #<(UPDATE_START+49*(BAR_START2+2)+4)
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sta OUTL
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lda #>(UPDATE_START+49*(BAR_START2+2)+4)
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sta OUTH
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jsr make_bars_entry
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rts
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make_bars_entry:
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ldy #0
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make_bars_loop:
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lda (INL),Y
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sta (OUTL),Y
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iny
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lda OUTL
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clc
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adc #48 ; because y++
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sta OUTL
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lda OUTH
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adc #0
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sta OUTH
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; cpy #32
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tya
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and #$1f
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bne make_bars_loop
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rts
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bar_colors_top:
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.byte $03,$0b,$0f,$0b,$30,$00,$00
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.byte $00,$02,$06,$0f,$06,$20,$00,$00
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.byte $00,$04,$0c,$0f,$0c,$40,$00,$00
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.byte $00,$05,$07,$0f,$07,$50,$00,$00,$00,$00,$00
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bar_colors_bottom:
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.byte $01,$03,$0f,$03,$10,$00,$00
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.byte $00,$08,$0d,$0f,$0d,$80,$00,$00
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.byte $00,$0c,$0e,$0f,$0e,$c0,$00,$00
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.byte $00,$09,$0d,$0f,$0d,$90,$00,$00,$00,$00,$00
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