extra effects
This commit is contained in:
@@ -14,13 +14,25 @@ COLRAM = $d800 ; color RAM
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CIA1_PA = $dc00 ; CIA1 port A: keyboard matrix column select
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CIA1_PB = $dc01 ; CIA1 port B: keyboard matrix row read
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; ---- sprite registers ----
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SPRPOS = $d000 ; sprite 0 x; +1 = y, +2 = sprite 1 x, ...
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SPR_MSBX = $d010 ; 9th bit of each sprite's x coordinate
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SPR_EN = $d015 ; sprite enable bits
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SPR_YEX = $d017 ; vertical expand
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SPR_PRIO = $d01b ; 1 = sprite behind the characters
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SPR_MC = $d01c ; multicolor enable
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SPR_XEX = $d01d ; horizontal expand
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SPR_COL = $d027 ; sprite 0 color, +1 = sprite 1, ...
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; ---- colors ----
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BLACK = 0
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WHITE = 1
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CYAN = 3
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YELLOW = 7
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ORANGE = 8
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DGREY = 11
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LGREEN = 13
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LBLUE = 14
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LGREY = 15
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; ---- screen layout (slide 1) ----
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@@ -41,9 +53,15 @@ BAR_STEPS = 57 ; 57 steps * 4 lines = up to line 244
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NUM_SLIDES = 5
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SLIDE_TIME = 300 ; 6 seconds per slide (PAL, 50 frames/s)
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S5_TIME = 450 ; slide 5 is longer: the typewriter needs time
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FADE_STEPS = 5 ; fade steps (longest fadetbl chain is 4)
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FADE_SPEED = 4 ; frames between two fade steps
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; ---- transition types (tin_tbl / tout_tbl in main.asm) ----
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TR_FADE = 0 ; fade through black (the original)
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TR_DISSOLVE = 1 ; cells appear/vanish in random order
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TR_WIPE = 2 ; column sweep, left to right
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FADEBUF = $c000 ; snapshot of color RAM for the fade-in
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; ---- zero page pointers ----
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@@ -4,12 +4,14 @@
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; slide 2: OUR FIRST GAME - Definitely not an Impostor
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; slide 3: OUR SECOND GAME IS COMING (border raster bars)
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; slide 4: CONTACT
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; slide 5: the assembly confession
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; slides cross-fade through black between switches
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; slide 5: the assembly confession (typewriter)
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; slides transition through black between switches
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; (fade / random dissolve / column wipe, per slide)
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; all timed by polling the raster beam
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;
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; Files:
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; defs.asm - constants, zero page, macros
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; transitions.asm - slide transitions: fade, dissolve, wipe
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; common.asm - shared routines, tables, variables
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; slideN.asm - one file per slide: sN_init, sN_update + data
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;
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@@ -90,7 +92,7 @@ dur_dec:
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bne main
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advance:
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jsr fade_out ; fade the old slide to black
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jsr trans_out ; hide the old slide (its out-transition)
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adv_release:
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jsr scan_space ; a held space must not race through
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beq adv_release ; the whole show
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@@ -106,7 +108,7 @@ slide_ok:
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jmp main
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go_back:
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jsr fade_out
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jsr trans_out
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back_release:
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jsr scan_del
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beq back_release
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@@ -176,170 +178,13 @@ slide_setup:
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lda #BLACK
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sta BORDER
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sta BG
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sta SPR_EN ; a slide that wants sprites enables them itself
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jmp (vec) ; init ends with rts -> returns to slide_setup's caller
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; ============================================================
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; slide transition: fade through black
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; ============================================================
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; ---- draw the current slide while the display is switched off
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; (everything shows border color = black), snapshot its colors,
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; blacken them, switch the display back on and fade in ----
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show_slide:
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lda #$0b ; display off
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sta SCRCTRL
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jsr slide_setup
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jsr snapshot_colram
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lda #$1b ; display on
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sta SCRCTRL
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; fade in: fadecnt counts how many times the target color is
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; darkened; counting 4 -> 0 walks each cell from black back
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; up to its snapshot color
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lda #FADE_STEPS-1
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sta fadecnt
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fi_step:
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jsr build_map
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jsr apply_map
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ldx #FADE_SPEED
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fi_wait:
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jsr wait_frame
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dex
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bne fi_wait
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lda fadecnt
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beq fi_done
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dec fadecnt
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jmp fi_step
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fi_done:
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rts
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; ---- darken the whole color RAM step by step until black ----
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fade_out:
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lda #FADE_STEPS
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sta fadecnt
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fo_step:
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ldx #FADE_SPEED
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fo_wait:
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jsr wait_frame
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dex
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bne fo_wait
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jsr apply_fade
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dec fadecnt
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bne fo_step
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rts
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; ---- wait for the next bottom-border arrival of the beam ----
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wait_frame:
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wf_leave:
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lda RASTER ; first leave line RAS_BOTTOM if we are on it
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cmp #RAS_BOTTOM
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beq wf_leave
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wf_reach:
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lda RASTER
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cmp #RAS_BOTTOM
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bne wf_reach
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rts
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; ---- one fade-out step: every color RAM cell one shade darker ----
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apply_fade:
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ldx #0
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af_loop:
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lda COLRAM,x
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and #15 ; color RAM reads have garbage upper bits
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tay
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lda fadetbl,y
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sta COLRAM,x
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lda COLRAM+250,x
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and #15
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tay
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lda fadetbl,y
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sta COLRAM+250,x
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lda COLRAM+500,x
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and #15
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tay
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lda fadetbl,y
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sta COLRAM+500,x
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lda COLRAM+750,x
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and #15
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tay
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lda fadetbl,y
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sta COLRAM+750,x
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inx
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cpx #250
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bne af_loop
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rts
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; ---- copy color RAM to FADEBUF, then blacken color RAM ----
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snapshot_colram:
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ldx #0
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sn_loop:
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lda COLRAM,x
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and #15
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sta FADEBUF,x
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lda COLRAM+250,x
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and #15
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sta FADEBUF+250,x
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lda COLRAM+500,x
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and #15
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sta FADEBUF+500,x
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lda COLRAM+750,x
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and #15
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sta FADEBUF+750,x
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lda #BLACK
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sta COLRAM,x
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sta COLRAM+250,x
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sta COLRAM+500,x
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sta COLRAM+750,x
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inx
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cpx #250
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bne sn_loop
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rts
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; ---- curmap[c] = color c darkened fadecnt times ----
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build_map:
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ldx #15
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bm_color:
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txa
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tay
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lda fadecnt
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sta bmcnt
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beq bm_store ; 0 steps: identity map
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bm_apply:
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lda fadetbl,y
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tay
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dec bmcnt
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bne bm_apply
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bm_store:
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tya
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sta curmap,x
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dex
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bpl bm_color
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rts
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; ---- write curmap[FADEBUF] into the whole color RAM ----
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apply_map:
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ldx #0
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am_loop:
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ldy FADEBUF,x
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lda curmap,y
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sta COLRAM,x
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ldy FADEBUF+250,x
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lda curmap,y
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sta COLRAM+250,x
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ldy FADEBUF+500,x
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lda curmap,y
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sta COLRAM+500,x
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ldy FADEBUF+750,x
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lda curmap,y
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sta COLRAM+750,x
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inx
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cpx #250
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bne am_loop
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rts
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; ============================================================
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; shared routines and the slides
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; transitions, shared routines and the slides
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; ============================================================
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!src "transitions.asm"
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!src "common.asm"
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!src "slide1.asm"
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!src "slide2.asm"
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@@ -357,16 +202,19 @@ slide_upd_lo:
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slide_upd_hi:
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!byte >s1_update, >s2_update, >s3_update, >s4_update, >s5_update
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slide_dur_lo:
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!byte <SLIDE_TIME, <SLIDE_TIME, <SLIDE_TIME, <SLIDE_TIME, <SLIDE_TIME
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!byte <SLIDE_TIME, <SLIDE_TIME, <SLIDE_TIME, <SLIDE_TIME, <S5_TIME
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slide_dur_hi:
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!byte >SLIDE_TIME, >SLIDE_TIME, >SLIDE_TIME, >SLIDE_TIME, >SLIDE_TIME
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!byte >SLIDE_TIME, >SLIDE_TIME, >SLIDE_TIME, >SLIDE_TIME, >S5_TIME
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; ---- per-slide transitions: reveal type / hide type ----
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tin_tbl:
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!byte TR_FADE, TR_WIPE, TR_DISSOLVE, TR_FADE, TR_DISSOLVE
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tout_tbl:
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!byte TR_DISSOLVE, TR_FADE, TR_WIPE, TR_DISSOLVE, TR_WIPE
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; ---- variables ----
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slide: !byte 0 ; current slide index
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durlo: !byte 0 ; frames left on this slide (16 bit)
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durhi: !byte 0
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fadecnt: !byte 0 ; fade step counter
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bmcnt: !byte 0 ; build_map inner counter
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curmap: !fill 16, 0 ; current fade-in color map
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paused: !byte 0 ; 1 = slide countdown frozen
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pheld: !byte 0 ; 'p' key edge detection state
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+24
-3
@@ -1,7 +1,7 @@
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; -----------------------------------------------------------
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; slide1.asm - giant TTG logo + credits scroller
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; effects: gold wash on the logo, smooth pixel scroll,
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; pulsing title
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; pulsing title, raster color gradient behind the scroller
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; -----------------------------------------------------------
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s1_init:
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@@ -12,9 +12,9 @@ s1_init:
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+prtext 17, 9, LGREEN, txt_www, txt_www_end - txt_www
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+prtext 19, 14, LGREY, txt_city, txt_city_end - txt_city
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; scroller row color
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; scroller row color: white, so it reads on the blue gradient
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ldx #39
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lda #CYAN
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lda #WHITE
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scrollcol_loop:
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sta COLRAM+SCROLLROW*40,x
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dex
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@@ -36,12 +36,30 @@ wait_scrtop:
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lda xscroll ; bits 0-2 = x scroll, bit 3 = 0 -> 38 columns
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sta XCTRL
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; blue raster gradient behind the scroller: one background
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; color per line, chasing the beam through lines 161-170
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ldx #0
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s1_grad:
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txa
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clc
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adc #RAS_SCRTOP+1
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s1_gwait:
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cmp RASTER
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bne s1_gwait
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lda gradtbl,x
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sta BG
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inx
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cpx #10
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bne s1_grad
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wait_scrbot:
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lda RASTER
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cmp #RAS_SCRBOT
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bne wait_scrbot
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lda #$c8 ; back to default: 40 columns, no scroll
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sta XCTRL
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lda #BLACK ; gradient off below the scroller row
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sta BG
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; beam is in the lower border: do all updates now, invisibly
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wait_bottom:
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@@ -213,6 +231,9 @@ bigfont:
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letter_off: ; column offset of each letter (8 wide + 2 gap)
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!byte 0, 10, 20
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gradtbl: ; scroller backdrop: blue ramp, cyan peak
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!byte $06, $06, $0e, $0e, $03, $03, $0e, $0e, $06, $06
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; texts in screen codes (!scr); lowercase source shows as uppercase on C64
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txt_title:
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!scr "teletype games"
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+17
-2
@@ -1,6 +1,8 @@
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; -----------------------------------------------------------
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; slide2.asm - OUR FIRST GAME: Definitely not an Impostor
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; big block letters with the gold wash running across them
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; big block letters with the gold wash running across them;
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; each text block gets a shifted wash phase, so the glow
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; rolls through the three lines diagonally
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; -----------------------------------------------------------
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s2_init:
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@@ -24,7 +26,8 @@ s2_update:
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inc washphase
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s2_hold:
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; gold wash across all 15 big-letter rows (4-8, 10-14, 16-20)
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; gold wash across all 15 big-letter rows (4-8, 10-14, 16-20);
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; each block is 5 wash steps behind the one above -> diagonal
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ldx #39
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s2_loop:
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txa
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@@ -38,11 +41,23 @@ s2_loop:
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sta COLRAM + 6*40,x
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sta COLRAM + 7*40,x
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sta COLRAM + 8*40,x
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tya
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clc
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adc #5
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and #15
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tay
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lda washtbl,y
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sta COLRAM + 10*40,x
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sta COLRAM + 11*40,x
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sta COLRAM + 12*40,x
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sta COLRAM + 13*40,x
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sta COLRAM + 14*40,x
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tya
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clc
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adc #5
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and #15
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tay
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lda washtbl,y
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sta COLRAM + 16*40,x
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sta COLRAM + 17*40,x
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sta COLRAM + 18*40,x
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+18
-2
@@ -1,7 +1,8 @@
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; -----------------------------------------------------------
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; slide3.asm - OUR SECOND GAME: IS COMING
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; raster bars running on the border only, drop-shadowed
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; big letters in the middle
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; raster bars on the border that also bleed into the empty
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; top and bottom of the screen; the middle stays black, so
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; the drop-shadowed big letters remain readable
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; -----------------------------------------------------------
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s3_init:
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@@ -25,6 +26,8 @@ s3_hold:
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; chase the beam: every 4th raster line from RAS_BARTOP down,
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; set the BORDER color from the cyclic 64-entry bar table;
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; above line 74 and from line 210 the screen rows are empty,
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; there the bars run on the background too - in the middle
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; the background stays black so the text remains readable
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lda #RAS_BARTOP
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sta s3line
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@@ -40,7 +43,19 @@ s3_wait:
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and #63
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tay
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lda rastbl,y
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ldy s3line
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cpy #74 ; top zone: bar color on the background too
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bcc s3_bg
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cpy #210 ; bottom zone likewise
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bcs s3_bg
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sta BORDER ; middle: border only, background back to
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lda #BLACK ; black (the top zone left its last color)
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sta BG
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jmp s3_step
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s3_bg:
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sta BG
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sta BORDER
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s3_step:
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lda s3line
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clc
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adc #4
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@@ -51,6 +66,7 @@ s3_wait:
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lda #BLACK ; below the bar area: back to black
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sta BORDER
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sta BG
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s3_wbot: ; keep the one-call-per-frame contract
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lda RASTER
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+182
-1
@@ -1,6 +1,8 @@
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; -----------------------------------------------------------
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; slide4.asm - CONTACT
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; pulsing big title, contact lines below
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; pulsing big title, contact lines, three-layer starfield
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; drifting left, six star sprites floating on sine paths
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; behind the text
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; -----------------------------------------------------------
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s4_init:
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@@ -9,6 +11,43 @@ s4_init:
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+prtext 10, 7, LGREEN, txt_web, txt_web_end - txt_web
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+prtext 13, 6, YELLOW, txt_bbs, txt_bbs_end - txt_bbs
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+prtext 16, 4, CYAN, txt_irc, txt_irc_end - txt_irc
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; starfield: draw the stars at their current positions so
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; the in-transition reveals them together with the text
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ldx #11
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s4i_star:
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jsr star_ptr
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ldy star_x,x
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lda #$2e ; '.'
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sta (scrlo),y
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lda star_col,x
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sta (collo),y
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dex
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bpl s4i_star
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; sprites: same star shape on all six, floating behind the
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; characters; enabled by the update, so they pop in only
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; after the slide's in-transition is done
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lda #(sprdata >> 6)
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ldx #5
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s4i_ptr:
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sta SCREEN+$3f8,x
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dex
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bpl s4i_ptr
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ldx #5
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s4i_col:
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lda sprcols,x
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sta SPR_COL,x
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dex
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bpl s4i_col
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lda #0
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sta SPR_MC
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sta SPR_XEX
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sta SPR_YEX
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lda #%00111111
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sta SPR_PRIO ; behind the text
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lda #%00100000 ; sprite 5 lives right of x=255
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sta SPR_MSBX
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rts
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s4_update:
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@@ -33,6 +72,79 @@ s4_loop:
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sta COLRAM + 6*40,x
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dex
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bpl s4_loop
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; starfield: three layers, each layer steps left on its own
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; frame mask (fast/mid/slow parallax)
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ldx #11
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s4u_star:
|
||||
lda framectr
|
||||
and star_mask,x
|
||||
bne s4u_next
|
||||
jsr star_ptr
|
||||
ldy star_x,x
|
||||
lda #$20 ; erase at the old position
|
||||
sta (scrlo),y
|
||||
lda star_x,x ; step left, wrap at the edge
|
||||
bne s4u_dec
|
||||
lda #40
|
||||
sta star_x,x
|
||||
s4u_dec:
|
||||
dec star_x,x
|
||||
ldy star_x,x
|
||||
lda #$2e
|
||||
sta (scrlo),y
|
||||
lda star_col,x
|
||||
sta (collo),y
|
||||
s4u_next:
|
||||
dex
|
||||
bpl s4u_star
|
||||
|
||||
; sprites: y from a sine table, x = base + slower sine wobble
|
||||
lda #%00111111
|
||||
sta SPR_EN
|
||||
ldx #5
|
||||
s4u_spr:
|
||||
txa
|
||||
asl
|
||||
sta sprofs ; register offset = sprite * 2
|
||||
lda framectr
|
||||
lsr
|
||||
clc
|
||||
adc spr_yph,x
|
||||
and #63
|
||||
tay
|
||||
lda ysin,y
|
||||
ldy sprofs
|
||||
sta SPRPOS+1,y
|
||||
lda framectr
|
||||
lsr
|
||||
lsr
|
||||
clc
|
||||
adc spr_xph,x
|
||||
and #63
|
||||
tay
|
||||
lda xwob,y
|
||||
clc
|
||||
adc spr_xbase,x
|
||||
ldy sprofs
|
||||
sta SPRPOS,y
|
||||
dex
|
||||
bpl s4u_spr
|
||||
rts
|
||||
|
||||
; ---- scrlo/hi + collo/hi = screen/color RAM row of star X ----
|
||||
star_ptr:
|
||||
ldy star_row,x
|
||||
lda mul40lo,y
|
||||
sta scrlo
|
||||
sta collo
|
||||
lda mul40hi,y
|
||||
clc
|
||||
adc #>SCREEN
|
||||
sta scrhi
|
||||
clc
|
||||
adc #$d4 ; COLRAM - SCREEN high byte distance
|
||||
sta colhi
|
||||
rts
|
||||
|
||||
; ---- data ----
|
||||
@@ -47,3 +159,72 @@ txt_bbs_end:
|
||||
txt_irc:
|
||||
!scr "irc: libera.chat #teletypegames"
|
||||
txt_irc_end:
|
||||
|
||||
; starfield: rows avoid the title (2-6) and text (10, 13, 16) rows
|
||||
star_row:
|
||||
!byte 0, 8, 11, 14, 17, 19, 1, 9, 12, 15, 21, 23
|
||||
star_mask: ; move on framectr & mask == 0
|
||||
!byte 1, 3, 7, 1, 3, 7, 1, 3, 7, 1, 3, 7
|
||||
star_col: ; fast = white, mid = lgrey, slow = dgrey
|
||||
!byte WHITE, LGREY, DGREY, WHITE, LGREY, DGREY
|
||||
!byte WHITE, LGREY, DGREY, WHITE, LGREY, DGREY
|
||||
|
||||
sprcols:
|
||||
!byte YELLOW, LBLUE, LGREEN, WHITE, ORANGE, CYAN
|
||||
spr_xbase: ; spread across the screen; sprite 5 gets
|
||||
!byte 40, 85, 130, 175, 220, 20 ; +256 via SPR_MSBX
|
||||
spr_yph: ; sine phase offsets per sprite
|
||||
!byte 0, 11, 21, 32, 43, 53
|
||||
spr_xph:
|
||||
!byte 0, 26, 52, 13, 39, 7
|
||||
|
||||
ysin: ; 64-entry sine, 134 +/- 60 (sprite y)
|
||||
!byte $86, $8c, $92, $97, $9d, $a2, $a7, $ac
|
||||
!byte $b0, $b4, $b8, $bb, $bd, $bf, $c1, $c2
|
||||
!byte $c2, $c2, $c1, $bf, $bd, $bb, $b8, $b4
|
||||
!byte $b0, $ac, $a7, $a2, $9d, $97, $92, $8c
|
||||
!byte $86, $80, $7a, $75, $6f, $6a, $65, $60
|
||||
!byte $5c, $58, $54, $51, $4f, $4d, $4b, $4a
|
||||
!byte $4a, $4a, $4b, $4d, $4f, $51, $54, $58
|
||||
!byte $5c, $60, $65, $6a, $6f, $75, $7a, $80
|
||||
|
||||
xwob: ; 64-entry sine, 12 +/- 12 (x wobble)
|
||||
!byte $0c, $0d, $0e, $0f, $11, $12, $13, $14
|
||||
!byte $14, $15, $16, $17, $17, $17, $18, $18
|
||||
!byte $18, $18, $18, $17, $17, $17, $16, $15
|
||||
!byte $14, $14, $13, $12, $11, $0f, $0e, $0d
|
||||
!byte $0c, $0b, $0a, $09, $07, $06, $05, $04
|
||||
!byte $04, $03, $02, $01, $01, $01, $00, $00
|
||||
!byte $00, $00, $00, $01, $01, $01, $02, $03
|
||||
!byte $04, $04, $05, $06, $07, $09, $0a, $0b
|
||||
|
||||
; 24x21 four-pointed star sprite (must sit on a 64-byte boundary
|
||||
; and below $4000, the top of the VIC's bank)
|
||||
!align 63, 0
|
||||
sprdata:
|
||||
!byte $00, $00, $00
|
||||
!byte $00, $00, $00
|
||||
!byte $00, $18, $00
|
||||
!byte $00, $18, $00
|
||||
!byte $00, $18, $00
|
||||
!byte $00, $3c, $00
|
||||
!byte $00, $3c, $00
|
||||
!byte $00, $7e, $00
|
||||
!byte $07, $ff, $e0
|
||||
!byte $00, $7e, $00
|
||||
!byte $00, $3c, $00
|
||||
!byte $00, $3c, $00
|
||||
!byte $00, $18, $00
|
||||
!byte $00, $18, $00
|
||||
!byte $00, $18, $00
|
||||
!byte $00, $00, $00
|
||||
!byte $00, $00, $00
|
||||
!byte $00, $00, $00
|
||||
!byte $00, $00, $00
|
||||
!byte $00, $00, $00
|
||||
!byte $00, $00, $00
|
||||
|
||||
; ---- variables ----
|
||||
star_x: ; star columns (start scattered)
|
||||
!byte 3, 17, 29, 8, 35, 22, 13, 31, 5, 26, 19, 37
|
||||
sprofs: !byte 0 ; sprite register offset in the update loop
|
||||
|
||||
+73
-11
@@ -1,16 +1,17 @@
|
||||
; -----------------------------------------------------------
|
||||
; slide5.asm - the assembly confession
|
||||
; the body is typed in live, one character per frame, with a
|
||||
; white block cursor; the closing line appears when the
|
||||
; typing is done and pulses
|
||||
; -----------------------------------------------------------
|
||||
|
||||
s5_init:
|
||||
jsr clear_screen
|
||||
+prtext 3, 11, WHITE, txt_conf1, txt_conf1_end - txt_conf1
|
||||
+prtext 7, 3, LGREY, txt_conf2, txt_conf2_end - txt_conf2
|
||||
+prtext 9, 3, LGREY, txt_conf3, txt_conf3_end - txt_conf3
|
||||
+prtext 12, 3, WHITE, txt_conf4, txt_conf4_end - txt_conf4
|
||||
+prtext 15, 3, LGREY, txt_conf5, txt_conf5_end - txt_conf5
|
||||
+prtext 17, 3, LGREY, txt_conf6, txt_conf6_end - txt_conf6
|
||||
+prtext 21, 11, CYAN, txt_conf7, txt_conf7_end - txt_conf7
|
||||
lda #0 ; the body starts empty and gets typed in
|
||||
sta t_line
|
||||
sta t_chr
|
||||
sta t_done
|
||||
rts
|
||||
|
||||
s5_update:
|
||||
@@ -19,6 +20,9 @@ s5_update:
|
||||
bne s5_update
|
||||
|
||||
inc framectr
|
||||
lda t_done
|
||||
beq s5_type
|
||||
|
||||
lda framectr ; pulse on the "(the ai says hi.)" line
|
||||
lsr
|
||||
lsr
|
||||
@@ -33,6 +37,55 @@ s5_loop:
|
||||
bpl s5_loop
|
||||
rts
|
||||
|
||||
; ---- type one character per frame ----
|
||||
s5_type:
|
||||
ldx t_line
|
||||
ldy t_row,x ; screen/color pointers to the line start
|
||||
lda mul40lo,y
|
||||
clc
|
||||
adc #3 ; body column
|
||||
sta scrlo
|
||||
sta collo
|
||||
lda mul40hi,y
|
||||
adc #>SCREEN ; carry still clear (row starts stay low)
|
||||
sta scrhi
|
||||
clc
|
||||
adc #$d4
|
||||
sta colhi
|
||||
lda t_txtlo,x
|
||||
sta txtlo
|
||||
lda t_txthi,x
|
||||
sta txthi
|
||||
|
||||
ldy t_chr
|
||||
lda (txtlo),y ; the character lands where the cursor was
|
||||
sta (scrlo),y
|
||||
lda t_color,x
|
||||
sta (collo),y
|
||||
iny
|
||||
cpy #34 ; all body lines are exactly 34 chars
|
||||
beq s5_nextline
|
||||
sty t_chr
|
||||
lda #$a0 ; block cursor at the next cell
|
||||
sta (scrlo),y
|
||||
lda #WHITE
|
||||
sta (collo),y
|
||||
rts
|
||||
|
||||
s5_nextline:
|
||||
lda #0
|
||||
sta t_chr
|
||||
inc t_line
|
||||
lda t_line
|
||||
cmp #5
|
||||
bne s5_ret
|
||||
; typing done: the closing line appears and starts pulsing
|
||||
+prtext 21, 11, CYAN, txt_conf7, txt_conf7_end - txt_conf7
|
||||
lda #1
|
||||
sta t_done
|
||||
s5_ret:
|
||||
rts
|
||||
|
||||
; ---- data ----
|
||||
txt_conf1:
|
||||
!scr "a quick confession"
|
||||
@@ -41,19 +94,28 @@ txt_conf1_end:
|
||||
; exactly 34 chars, so both edges line up at columns 3 and 36
|
||||
txt_conf2:
|
||||
!scr "we speak c/c++, lua, python, java,"
|
||||
txt_conf2_end:
|
||||
txt_conf3:
|
||||
!scr "go, ruby, js, elixir, pascal."
|
||||
txt_conf3_end:
|
||||
txt_conf4:
|
||||
!scr "but 6502 assembly? not a word."
|
||||
txt_conf4_end:
|
||||
txt_conf5:
|
||||
!scr "so this slideshow was written"
|
||||
txt_conf5_end:
|
||||
txt_conf6:
|
||||
!scr "with a little help from an ai."
|
||||
txt_conf6_end:
|
||||
txt_conf7:
|
||||
!scr "(the ai says hi.)"
|
||||
txt_conf7_end:
|
||||
|
||||
t_row: ; body line rows
|
||||
!byte 7, 9, 12, 15, 17
|
||||
t_color:
|
||||
!byte LGREY, LGREY, WHITE, LGREY, LGREY
|
||||
t_txtlo:
|
||||
!byte <txt_conf2, <txt_conf3, <txt_conf4, <txt_conf5, <txt_conf6
|
||||
t_txthi:
|
||||
!byte >txt_conf2, >txt_conf3, >txt_conf4, >txt_conf5, >txt_conf6
|
||||
|
||||
; ---- variables ----
|
||||
t_line: !byte 0 ; body line being typed (0-4)
|
||||
t_chr: !byte 0 ; next character within the line
|
||||
t_done: !byte 0 ; 1 = typing finished, closing line pulses
|
||||
|
||||
+373
@@ -0,0 +1,373 @@
|
||||
; -----------------------------------------------------------
|
||||
; transitions.asm - slide transitions
|
||||
; every slide is drawn with the display switched off, its
|
||||
; colors are snapshotted into FADEBUF and blackened, then an
|
||||
; in-transition reveals it; an out-transition hides it again.
|
||||
; types (picked per slide in tin_tbl/tout_tbl in main.asm):
|
||||
; TR_FADE - fade through black via the fadetbl ramps
|
||||
; TR_DISSOLVE - cells appear/vanish in random (LFSR) order
|
||||
; TR_WIPE - column sweep from left to right
|
||||
; each reveal starts with a short grey border flash
|
||||
; -----------------------------------------------------------
|
||||
|
||||
; ---- draw the current slide while the display is switched off
|
||||
; (everything shows border color = black), snapshot its colors,
|
||||
; blacken them, switch the display back on, flash, transition in ----
|
||||
show_slide:
|
||||
lda #$0b ; display off
|
||||
sta SCRCTRL
|
||||
jsr slide_setup
|
||||
jsr snapshot_colram
|
||||
lda #$1b ; display on
|
||||
sta SCRCTRL
|
||||
|
||||
ldx #0 ; short white-to-grey border flash: gives
|
||||
ssf_loop: ; the reveal a beat
|
||||
lda flashtbl,x
|
||||
sta BORDER
|
||||
jsr wait_frame
|
||||
inx
|
||||
cpx #3
|
||||
bne ssf_loop
|
||||
lda #BLACK
|
||||
sta BORDER
|
||||
|
||||
ldx slide ; dispatch the slide's in-transition
|
||||
ldy tin_tbl,x
|
||||
lda tin_lo,y
|
||||
sta vec
|
||||
lda tin_hi,y
|
||||
sta vec+1
|
||||
jmp (vec) ; the transition ends with rts
|
||||
|
||||
; ---- dispatch the slide's out-transition ----
|
||||
trans_out:
|
||||
lda #0 ; sprites vanish with the slide
|
||||
sta SPR_EN
|
||||
ldx slide
|
||||
ldy tout_tbl,x
|
||||
lda tout_lo,y
|
||||
sta vec
|
||||
lda tout_hi,y
|
||||
sta vec+1
|
||||
jmp (vec)
|
||||
|
||||
tin_lo:
|
||||
!byte <fade_in, <dissolve_in, <wipe_in
|
||||
tin_hi:
|
||||
!byte >fade_in, >dissolve_in, >wipe_in
|
||||
tout_lo:
|
||||
!byte <fade_out, <dissolve_out, <wipe_out
|
||||
tout_hi:
|
||||
!byte >fade_out, >dissolve_out, >wipe_out
|
||||
|
||||
flashtbl:
|
||||
!byte WHITE, LGREY, DGREY
|
||||
|
||||
; ============================================================
|
||||
; TR_FADE - fade through black
|
||||
; ============================================================
|
||||
|
||||
; ---- fade in: fadecnt counts how many times the target color is
|
||||
; darkened; counting 4 -> 0 walks each cell from black back
|
||||
; up to its snapshot color ----
|
||||
fade_in:
|
||||
lda #FADE_STEPS-1
|
||||
sta fadecnt
|
||||
fi_step:
|
||||
jsr build_map
|
||||
jsr apply_map
|
||||
ldx #FADE_SPEED
|
||||
fi_wait:
|
||||
jsr wait_frame
|
||||
dex
|
||||
bne fi_wait
|
||||
lda fadecnt
|
||||
beq fi_done
|
||||
dec fadecnt
|
||||
jmp fi_step
|
||||
fi_done:
|
||||
rts
|
||||
|
||||
; ---- darken the whole color RAM step by step until black ----
|
||||
fade_out:
|
||||
lda #FADE_STEPS
|
||||
sta fadecnt
|
||||
fo_step:
|
||||
ldx #FADE_SPEED
|
||||
fo_wait:
|
||||
jsr wait_frame
|
||||
dex
|
||||
bne fo_wait
|
||||
jsr apply_fade
|
||||
dec fadecnt
|
||||
bne fo_step
|
||||
rts
|
||||
|
||||
; ---- one fade-out step: every color RAM cell one shade darker ----
|
||||
apply_fade:
|
||||
ldx #0
|
||||
af_loop:
|
||||
lda COLRAM,x
|
||||
and #15 ; color RAM reads have garbage upper bits
|
||||
tay
|
||||
lda fadetbl,y
|
||||
sta COLRAM,x
|
||||
lda COLRAM+250,x
|
||||
and #15
|
||||
tay
|
||||
lda fadetbl,y
|
||||
sta COLRAM+250,x
|
||||
lda COLRAM+500,x
|
||||
and #15
|
||||
tay
|
||||
lda fadetbl,y
|
||||
sta COLRAM+500,x
|
||||
lda COLRAM+750,x
|
||||
and #15
|
||||
tay
|
||||
lda fadetbl,y
|
||||
sta COLRAM+750,x
|
||||
inx
|
||||
cpx #250
|
||||
bne af_loop
|
||||
rts
|
||||
|
||||
; ---- curmap[c] = color c darkened fadecnt times ----
|
||||
build_map:
|
||||
ldx #15
|
||||
bm_color:
|
||||
txa
|
||||
tay
|
||||
lda fadecnt
|
||||
sta bmcnt
|
||||
beq bm_store ; 0 steps: identity map
|
||||
bm_apply:
|
||||
lda fadetbl,y
|
||||
tay
|
||||
dec bmcnt
|
||||
bne bm_apply
|
||||
bm_store:
|
||||
tya
|
||||
sta curmap,x
|
||||
dex
|
||||
bpl bm_color
|
||||
rts
|
||||
|
||||
; ---- write curmap[FADEBUF] into the whole color RAM ----
|
||||
apply_map:
|
||||
ldx #0
|
||||
am_loop:
|
||||
ldy FADEBUF,x
|
||||
lda curmap,y
|
||||
sta COLRAM,x
|
||||
ldy FADEBUF+250,x
|
||||
lda curmap,y
|
||||
sta COLRAM+250,x
|
||||
ldy FADEBUF+500,x
|
||||
lda curmap,y
|
||||
sta COLRAM+500,x
|
||||
ldy FADEBUF+750,x
|
||||
lda curmap,y
|
||||
sta COLRAM+750,x
|
||||
inx
|
||||
cpx #250
|
||||
bne am_loop
|
||||
rts
|
||||
|
||||
; ============================================================
|
||||
; TR_DISSOLVE - cells appear/vanish in random order
|
||||
; a 10-bit LFSR walks all indexes 1..1023 exactly once per
|
||||
; period; indexes >= 1000 are skipped, cell 0 (which the LFSR
|
||||
; never yields) is handled up front. 25 cells per frame ->
|
||||
; the full screen takes 40 frames (0.8 s).
|
||||
; ============================================================
|
||||
|
||||
dissolve_in:
|
||||
lda FADEBUF ; cell 0 first
|
||||
sta COLRAM
|
||||
lda #40
|
||||
sta frcnt
|
||||
din_frame:
|
||||
jsr wait_frame
|
||||
lda #25
|
||||
sta cellcnt
|
||||
din_cell:
|
||||
jsr lfsr_next ; -> lfsrlo/hi = cell index 1..999
|
||||
lda lfsrlo
|
||||
sta scrlo
|
||||
sta collo
|
||||
lda lfsrhi
|
||||
clc
|
||||
adc #>FADEBUF
|
||||
sta scrhi
|
||||
lda lfsrhi
|
||||
clc
|
||||
adc #>COLRAM
|
||||
sta colhi
|
||||
ldy #0
|
||||
lda (scrlo),y ; restore the snapshot color
|
||||
sta (collo),y
|
||||
dec cellcnt
|
||||
bne din_cell
|
||||
dec frcnt
|
||||
bne din_frame
|
||||
rts
|
||||
|
||||
dissolve_out:
|
||||
lda #BLACK ; cell 0 first
|
||||
sta COLRAM
|
||||
lda #40
|
||||
sta frcnt
|
||||
dot_frame:
|
||||
jsr wait_frame
|
||||
lda #25
|
||||
sta cellcnt
|
||||
dot_cell:
|
||||
jsr lfsr_next
|
||||
lda lfsrlo
|
||||
sta collo
|
||||
lda lfsrhi
|
||||
clc
|
||||
adc #>COLRAM
|
||||
sta colhi
|
||||
ldy #0
|
||||
lda #BLACK
|
||||
sta (collo),y
|
||||
dec cellcnt
|
||||
bne dot_cell
|
||||
dec frcnt
|
||||
bne dot_frame
|
||||
rts
|
||||
|
||||
; ---- 10-bit Galois LFSR (x^10 + x^7 + 1, period 1023) ----
|
||||
; steps until the state is a valid cell index (< 1000); the
|
||||
; state is never reset, coverage holds from any starting point
|
||||
lfsr_next:
|
||||
lsr lfsrhi
|
||||
ror lfsrlo
|
||||
bcc ln_notap
|
||||
lda lfsrhi
|
||||
eor #$02
|
||||
sta lfsrhi
|
||||
lda lfsrlo
|
||||
eor #$40
|
||||
sta lfsrlo
|
||||
ln_notap:
|
||||
lda lfsrhi ; skip 1000..1023 ($03e8..$03ff)
|
||||
cmp #$03
|
||||
bcc ln_ok
|
||||
lda lfsrlo
|
||||
cmp #$e8
|
||||
bcs lfsr_next
|
||||
ln_ok:
|
||||
rts
|
||||
|
||||
; ============================================================
|
||||
; TR_WIPE - column sweep, one column per frame, left to right
|
||||
; ============================================================
|
||||
|
||||
wipe_in:
|
||||
lda #0
|
||||
sta wcol
|
||||
wi_col:
|
||||
jsr wait_frame
|
||||
ldx #24
|
||||
wi_row:
|
||||
lda mul40lo,x
|
||||
sta scrlo
|
||||
sta collo
|
||||
lda mul40hi,x
|
||||
clc
|
||||
adc #>FADEBUF
|
||||
sta scrhi
|
||||
lda mul40hi,x
|
||||
clc
|
||||
adc #>COLRAM
|
||||
sta colhi
|
||||
ldy wcol
|
||||
lda (scrlo),y ; restore the snapshot color
|
||||
sta (collo),y
|
||||
dex
|
||||
bpl wi_row
|
||||
inc wcol
|
||||
lda wcol
|
||||
cmp #40
|
||||
bne wi_col
|
||||
rts
|
||||
|
||||
wipe_out:
|
||||
lda #0
|
||||
sta wcol
|
||||
wo_col:
|
||||
jsr wait_frame
|
||||
ldx #24
|
||||
wo_row:
|
||||
lda mul40lo,x
|
||||
sta collo
|
||||
lda mul40hi,x
|
||||
clc
|
||||
adc #>COLRAM
|
||||
sta colhi
|
||||
ldy wcol
|
||||
lda #BLACK
|
||||
sta (collo),y
|
||||
dex
|
||||
bpl wo_row
|
||||
inc wcol
|
||||
lda wcol
|
||||
cmp #40
|
||||
bne wo_col
|
||||
rts
|
||||
|
||||
; ============================================================
|
||||
; shared helpers
|
||||
; ============================================================
|
||||
|
||||
; ---- wait for the next bottom-border arrival of the beam ----
|
||||
wait_frame:
|
||||
wf_leave:
|
||||
lda RASTER ; first leave line RAS_BOTTOM if we are on it
|
||||
cmp #RAS_BOTTOM
|
||||
beq wf_leave
|
||||
wf_reach:
|
||||
lda RASTER
|
||||
cmp #RAS_BOTTOM
|
||||
bne wf_reach
|
||||
rts
|
||||
|
||||
; ---- copy color RAM to FADEBUF, then blacken color RAM ----
|
||||
snapshot_colram:
|
||||
ldx #0
|
||||
sn_loop:
|
||||
lda COLRAM,x
|
||||
and #15
|
||||
sta FADEBUF,x
|
||||
lda COLRAM+250,x
|
||||
and #15
|
||||
sta FADEBUF+250,x
|
||||
lda COLRAM+500,x
|
||||
and #15
|
||||
sta FADEBUF+500,x
|
||||
lda COLRAM+750,x
|
||||
and #15
|
||||
sta FADEBUF+750,x
|
||||
lda #BLACK
|
||||
sta COLRAM,x
|
||||
sta COLRAM+250,x
|
||||
sta COLRAM+500,x
|
||||
sta COLRAM+750,x
|
||||
inx
|
||||
cpx #250
|
||||
bne sn_loop
|
||||
rts
|
||||
|
||||
; ---- variables ----
|
||||
fadecnt: !byte 0 ; fade step counter
|
||||
bmcnt: !byte 0 ; build_map inner counter
|
||||
curmap: !fill 16, 0 ; current fade-in color map
|
||||
lfsrlo: !byte $37 ; LFSR state (any nonzero seed)
|
||||
lfsrhi: !byte $01
|
||||
cellcnt: !byte 0 ; dissolve: cells left this frame
|
||||
frcnt: !byte 0 ; dissolve: frames left
|
||||
wcol: !byte 0 ; wipe: current column
|
||||
Reference in New Issue
Block a user