initial commit

2026-07-15 21:31:51 +02:00
commit 0fb584bcd7
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+; -----------------------------------------------------------
+; title.asm - big RABBIT logo over the road, scooters parked
+; on all five lanes, three demo rabbits hopping in, blinking
+; "press fire to start"
+; -----------------------------------------------------------
+
+title_init:
+    jsr clear_screen
+    jsr draw_road
+
+    +prbig 1, 8, BLACK, txt_rabbit, 6
+    +prtext 6, 16, BLACK, txt_scooter, 7
+    +prtext 17, 5, BLACK, txt_info, 30
+
+    ; one parked scooter per lane on sprites 0-4
+    ldx #4
+ti_scoot:
+    txa
+    asl
+    tay
+    lda pxlo,x
+    sta SPRPOS,y
+    lda #PLAYER_SY
+    sta SPRPOS+1,y
+    lda #SPRP_SCOOT
+    sta SPRPTR,x
+    dex
+    bpl ti_scoot
+    lda #0
+    sta SPR_XEX
+    sta SPR_YEX
+
+    ; demo rabbits on slots 4-6 (sprites 5-7), staggered starts
+    ldx #4
+ti_demo:
+    jsr rand5
+    sta r_lane,x
+    lda demo_t-4,x
+    sta r_thi,x
+    lda #1
+    sta r_act,x
+    inx
+    cpx #NRABBITS
+    bne ti_demo
+
+    +setupd title_update
+    rts
+
+title_update:
+    ; shadows: five scooters (lane 4 needs the x MSB), no expand
+    lda #%00011111
+    sta en_sh
+    lda #%00010000
+    sta msb_sh
+    lda #0
+    sta xex_sh
+    sta yex_sh
+
+    ; demo rabbits: constant lope, respawn on a random lane
+    ldx #4
+tu_rab:
+    lda r_thi,x
+    clc
+    adc #3
+    sta r_thi,x
+    bcc tu_pos
+    lda #0
+    sta r_thi,x
+    jsr rand5
+    sta r_lane,x
+tu_pos:
+    jsr rab_pos
+    inx
+    cpx #NRABBITS
+    bne tu_rab
+
+    jsr write_shadows
+
+    ; blink the start line
+    lda framectr
+    and #32
+    bne tu_hide
+    +prtext 15, 10, BLACK, txt_press, 19
+    jmp tu_start
+tu_hide:
+    +prtext 15, 10, BLACK, txt_blank, 19
+tu_start:
+    jsr start_edge
+    beq tu_done
+    jmp play_init        ; its rts returns to the main loop
+tu_done:
+    rts
+
+demo_t: !byte 0, 85, 170