mirror of
https://github.com/deater/dos33fsprogs.git
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spacebars: split off title page
This commit is contained in:
Vince Weaver
parent
222e181b57
commit
6b6c6f89ce
@ -14,7 +14,7 @@ space_bars.dsk: SPACE_BARS
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SPACE_BARS: space_bars.o
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ld65 -o SPACE_BARS space_bars.o -C ../linker_scripts/apple2_1000.inc
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space_bars.o: space_bars.s gr_copy.s \
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space_bars.o: space_bars.s gr_copy.s title.s \
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spacebars_title.inc
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ca65 -o space_bars.o space_bars.s -l space_bars.lst
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@ -1,8 +1,10 @@
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; Display a 40x48d lo-res image
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; Uses the 40x48d page1/page2 every-1-scanline pageflip mode
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;=====================================
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; Rasterbars in Space
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;
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; a cycle-counting game
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;
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; by deater (Vince Weaver) <vince@deater.net>
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;=====================================
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; Zero Page
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FRAMEBUFFER = $00 ; $00 - $0F
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@ -20,7 +22,6 @@ DRAW_PAGE = $EE
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LASTKEY = $F1
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PADDLE_STATUS = $F2
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TEMP = $FA
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WHICH = $FB
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; Soft Switches
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KEYPRESS= $C000
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@ -40,261 +41,34 @@ TEXT = $FB36 ;; Set text mode
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HOME = $FC58 ;; Clear the text screen
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WAIT = $FCA8 ;; delay 1/2(26+27A+5A^2) us
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MAX = 1
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lda #$ff
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sta WHICH
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start_over:
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inc WHICH
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lda WHICH
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cmp #MAX
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bne in_range
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lda #0
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sta WHICH
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;==================
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; show title screen
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;==================
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in_range:
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jsr title_screen
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;===================
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; init screen
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jsr TEXT
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jsr HOME
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bit KEYRESET
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;==================
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; Display Text
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;==================
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;===================
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; init vars
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;==================
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; Mode7
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;==================
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lda #0
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sta DRAW_PAGE
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;==================
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; Rasterbars
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;==================
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;=============================
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; Load graphic page0
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;==================
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; Game Over
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;==================
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lda #$0c
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sta BASH
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lda #$00
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sta BASL ; load image to $c00
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game_over:
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jmp game_over
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lda WHICH
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asl
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asl ; which*4
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tay
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lda pictures,Y
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sta GBASL
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lda pictures+1,Y
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sta GBASH
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jsr load_rle_gr
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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
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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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;=============================
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; Load graphic page1
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lda #$0c
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sta BASH
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lda #$00
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sta BASL ; load image to $c00
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lda WHICH
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asl
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asl ; which*4
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tay
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lda pictures+2,Y
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sta GBASL
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lda pictures+3,Y
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sta GBASH
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jsr load_rle_gr
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lda #0
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sta DRAW_PAGE
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jsr gr_copy_to_current
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; GR part
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bit PAGE0
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jsr wait_until_keypressed
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;==============================
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; setup graphics for vapor lock
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;==============================
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; Clear Page0
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lda #$0
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sta DRAW_PAGE
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lda #$44
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jsr clear_gr
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; Make screen half green
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lda #$11
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ldy #24
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jsr clear_page_loop
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;=====================================================
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; attempt vapor lock
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; by reading the "floating bus" we can see most recently
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; written value of the display
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; we look for $55 (which is the grey line)
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;=====================================================
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; See:
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; Have an Apple Split by Bob Bishop
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; Softalk, October 1982
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; Challenges: each scan line scans 40 bytes.
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; The blanking happens at the *beginning*
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; So 65 bytes are scanned, starting at adress of the line - 25
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; the scan takes 8 cycles, look for 4 repeats of the value
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; to avoid false positive found if the horiz blanking is mirroring
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; the line (max 3 repeats in that case)
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vapor_lock_loop: ; first make sure we have all zeroes
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LDA #$11
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zxloop:
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LDX #$04
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wiloop:
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CMP $C051
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BNE zxloop
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DEX
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BNE wiloop
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LDA #$44 ; now look for our border color (4 times)
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zloop:
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LDX #$04
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qloop:
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CMP $C051
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BNE zloop
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DEX
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BNE qloop
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; found first line of black after green, at up to line 26 on screen
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; so we want roughly 22 lines * 4 = 88*65 = 5720 + 4550 = 10270
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; - 65 (for the scanline we missed) = 10205 - 12 = 10193
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jsr gr_copy_to_current ; 6+ 9292
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; 10193 - 9298 = 895
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; Fudge factor (unknown) -30 = 865
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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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; Try X=88 Y=2 cycles=893 R2
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nop
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ldy #2 ; 2
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loopA:
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ldx #88 ; 2
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loopB:
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dex ; 2
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bne loopB ; 2nt/3
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dey ; 2
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bne loopA ; 2nt/3
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jmp display_loop
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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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; 2 + 48*( (4+2+25*(2+3)) + (4+2+23*(2+3)+4+5)) + 9)
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; 48*[(6+125)-1] + [(6+115+10)-1]
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display_loop:
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ldy #96 ; 2
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outer_loop:
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bit PAGE0 ; 4
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ldx #12 ; 65 cycles with PAGE0 ; 2
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page0_loop: ; delay 61+bit
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dex ; 2
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bne page0_loop ; 2/3
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; bit(4) -1(fallthrough) + loop*5 -1(fallthrouh)+4 extra = 61
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; 5L = 55
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bit PAGE1 ; 4
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ldx #11 ; 65 cycles with PAGE1 ; 2
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;
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page1_loop: ; delay 115+(7 loop)+4 (bit)+4(extra)
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dex ; 2
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bne page1_loop ; 2/3
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dey ; 2
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bne outer_loop ; 2/3
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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+1 -2-9 -7= 4533
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jsr do_nothing ; 6
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lda KEYPRESS ; 4
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bpl no_keypress ; 3
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jmp start_over
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no_keypress:
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jmp display_loop ; 3
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;=================================
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; do nothing
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;=================================
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; and take 4533-6 = 4527 cycles to do it
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do_nothing:
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; Try X=4 Y=174 cycles=4525 R2
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nop ; 2
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ldy #174 ; 2
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loop1:
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ldx #4 ; 2
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loop2:
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dex ; 2
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bne loop2 ; 2nt/3
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dey ; 2
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bne loop1 ; 2nt/3
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rts ; 6
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@ -342,9 +116,7 @@ gr_offsets:
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.include "../asm_routines/gr_unrle.s"
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.include "../asm_routines/keypress.s"
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.include "gr_copy.s"
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pictures:
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.word spacebars_title_low,spacebars_title_high
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.include "title.s"
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.include "spacebars_title.inc"
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233
space_bars/title.s
Normal file
233
space_bars/title.s
Normal file
@ -0,0 +1,233 @@
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;================================
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; Show the title screen
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; return when a key is pressed
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;================================
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title_screen:
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;===================
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; init screen
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jsr TEXT
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jsr HOME
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bit KEYRESET
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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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; Load graphic page0
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lda #$0c
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sta BASH
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lda #$00
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sta BASL ; load image to $c00
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lda #<spacebars_title_low
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sta GBASL
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lda #>spacebars_title_low
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sta GBASH
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jsr load_rle_gr
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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
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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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;=============================
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; Load graphic page1
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lda #$0c
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sta BASH
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lda #$00
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sta BASL ; load image to $c00
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lda #<spacebars_title_high
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sta GBASL
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lda #>spacebars_title_high
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sta GBASH
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jsr load_rle_gr
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lda #0
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sta DRAW_PAGE
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; GR part
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bit PAGE0
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;==============================
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; setup graphics for vapor lock
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;==============================
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; Clear Page0
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lda #$0
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sta DRAW_PAGE
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lda #$44
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jsr clear_gr
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; Make screen half green
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lda #$11
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ldy #24
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jsr clear_page_loop
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;=====================================================
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; attempt vapor lock
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; by reading the "floating bus" we can see most recently
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; written value of the display
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; we look for $55 (which is the grey line)
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;=====================================================
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; See:
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; Have an Apple Split by Bob Bishop
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; Softalk, October 1982
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; Challenges: each scan line scans 40 bytes.
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; The blanking happens at the *beginning*
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; So 65 bytes are scanned, starting at adress of the line - 25
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; the scan takes 8 cycles, look for 4 repeats of the value
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; to avoid false positive found if the horiz blanking is mirroring
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; the line (max 3 repeats in that case)
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vapor_lock_loop: ; first make sure we have all zeroes
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LDA #$11
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zxloop:
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LDX #$04
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wiloop:
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CMP $C051
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BNE zxloop
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DEX
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BNE wiloop
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LDA #$44 ; now look for our border color (4 times)
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zloop:
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LDX #$04
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qloop:
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CMP $C051
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BNE zloop
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DEX
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BNE qloop
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; found first line of black after green, at up to line 26 on screen
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; so we want roughly 22 lines * 4 = 88*65 = 5720 + 4550 = 10270
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; - 65 (for the scanline we missed) = 10205 - 12 = 10193
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jsr gr_copy_to_current ; 6+ 9292
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; 10193 - 9298 = 895
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; Fudge factor (unknown) -30 = 865
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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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; Try X=88 Y=2 cycles=893 R2
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nop
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ldy #2 ; 2
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loopA:
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ldx #88 ; 2
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loopB:
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dex ; 2
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bne loopB ; 2nt/3
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dey ; 2
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bne loopA ; 2nt/3
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jmp display_loop
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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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; 2 + 48*( (4+2+25*(2+3)) + (4+2+23*(2+3)+4+5)) + 9)
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; 48*[(6+125)-1] + [(6+115+10)-1]
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display_loop:
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ldy #96 ; 2
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outer_loop:
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bit PAGE0 ; 4
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ldx #12 ; 65 cycles with PAGE0 ; 2
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page0_loop: ; delay 61+bit
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dex ; 2
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bne page0_loop ; 2/3
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; bit(4) -1(fallthrough) + loop*5 -1(fallthrouh)+4 extra = 61
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; 5L = 55
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bit PAGE1 ; 4
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ldx #11 ; 65 cycles with PAGE1 ; 2
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;
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page1_loop: ; delay 115+(7 loop)+4 (bit)+4(extra)
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dex ; 2
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bne page1_loop ; 2/3
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dey ; 2
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bne outer_loop ; 2/3
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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+1 -2-9 -7= 4533
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jsr do_nothing ; 6
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lda KEYPRESS ; 4
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bpl no_keypress ; 3
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jmp return
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no_keypress:
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jmp display_loop ; 3
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;=================================
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; do nothing
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;=================================
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; and take 4533-6 = 4527 cycles to do it
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do_nothing:
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; Try X=4 Y=174 cycles=4525 R2
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nop ; 2
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ldy #174 ; 2
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loop1:
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ldx #4 ; 2
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loop2:
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dex ; 2
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bne loop2 ; 2nt/3
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dey ; 2
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bne loop1 ; 2nt/3
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return:
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rts ; 6
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