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mainmenu.asm
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mainmenu.asm
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; this sub routine sets up the main menu
; it will load the background into nametable 1
; and swap to that table
; also moves sprites around
; inputs:
; none
; side effects:
; nametables are updated, sprites changed
; registers changed
init_main_menu:
jsr stop_audio
lda #$00
sta gfx_flags
sta load_flags
lda #$01
sta level_select
lda #<update_main_menu
sta update_sub
lda #>update_main_menu
sta update_sub+1
lda #<update_crit_none
sta update_sub_crit
lda #>update_crit_none
sta update_sub_crit+1
; load palette
lda #<palette_data
sta palette_ptr
lda #>palette_data
sta palette_ptr+1
jsr load_palette
lda #GAME_MODE_MENU
sta game_mode
jsr hide_objs
; move unsued sprites off-screen
lda #$00
sta sprite_data_3
sta sprite_data_3+3
sta sprite_data_4
sta sprite_data_4+3
sta sprite_data_5
sta sprite_data_5+3
sta sprite_data_6
sta sprite_data_6+3
sta sprite_data_7
sta sprite_data_7+3
sta sprite_data_8
sta sprite_data_8+3
sta sprite_data_9
sta sprite_data_9+3
sta sprite_data_A
sta sprite_data_A+3
; no smooth scrolling outside of in-game mode
sta smooth_left
sta smooth_right
sta smooth_up
sta smooth_down
; level select display
lda #$0B*08 ; x position
sta sprite_data_1+3
lda #$0A*08 ; x positon
sta sprite_data_2+3
lda #$08*08 ; y position
sta sprite_data_1
sta sprite_data_2
; cursor sprite
lda #$31
sta sprite_data+1
; seed input
lda seed_bac
sta seed_input
lda seed_bac+1
sta seed_input+1
; seed input display
ldy #$97 ; y coordinate
sty sprite_data_3
sty sprite_data_4
sty sprite_data_5
sty sprite_data_6
ldy #$48
sty sprite_data_3+3
ldy #$48+8
sty sprite_data_4+3
ldy #$48+8*2
sty sprite_data_5+3
ldy #$48+8*3
sty sprite_data_6+3
; enable sprite rendering
lda mask_flags
ora #%00010000 ; sprites
sta mask_flags
rts
; update sub routine for main menu
; inputs:
; none
; side effects:
; regsiters and flags are changed
update_main_menu:
lda menu_select
and #MAIN_MENU_MAX_SELECT ; only 3 possible options
cmp #$08
bcc @no_overflow
lda #$00
@no_overflow:
sta menu_select
; set sprite at correct position
tax
lda main_menu_cursor_x, x
sta player_x
lda main_menu_cursor_y, x
sta player_y
lda main_menu_cursor_attr, x
sta sprite_data+2
; use 2 sprites to display the currently selected level
lda level_select
and #$0F
sta sprite_data_1+1
lda level_select
and #$F0
lsr
lsr
lsr
lsr
sta sprite_data_2+1
; display seed input
lda seed_input
jsr convert_hex
lda hex_buffer+1
sta sprite_data_3+1
lda hex_buffer
sta sprite_data_4+1
lda seed_input+1
jsr convert_hex
lda hex_buffer+1
sta sprite_data_5+1
lda hex_buffer
sta sprite_data_6+1
; seed = rand16 in main menu
lda rand8
sta seed
lda rand16
sta seed+1
@done:
jmp update_done