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use named memory addresses for score tiles

This commit is contained in:
Michael Miceli 2024-01-13 00:41:09 -05:00
parent a21a428fd5
commit af8d290492
2 changed files with 34 additions and 34 deletions
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4
src/bank1.asm
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@ -1482,9 +1482,9 @@ bank_1_unused_label_00:
pha
ldx #$00 ; x = #$00
stx $e6
lda $010a
lda SOUND_CODE+4
beq @pop_and_exit
stx $010a ; set sound channel config register offset (#$00, #$04, #$08, or #$0c)
stx SOUND_CODE+4 ; set sound channel config register offset (#$00, #$04, #$08, or #$0c)
stx SOUND_CHNL_REG_OFFSET ; set sound channel config register offset (#$00, #$04, #$08, or #$0c)
jsr init_pulse_channel

16
src/bank7.asm
View File

@ -303,7 +303,7 @@ nmi_start:
bne handle_sounds_set_ppu_scroll_rti ; branch if nmi occurred before game loop was completed to skip game loop
; instead just continue playing sounds, set ppu scroll, and rti
; previously unfinished frame will finish after rti and then itself rti
jsr clear_ppu ; first frame, so clear/init PPU
jsr clear_ppu ; re-init PPU
sta OAMADDR ; set OAM address to #00 (DMA is used instead)
ldy #>OAMDMA_CPU_BUFFER ; setting OAMDMA to #$02 tells PPU to load sprite data from $0200-$02ff
sty OAMDMA ; write #$100 (256 decimal) bytes ($0200 to $02ff) of data to PPU OAM (the entire screen)
@ -2438,12 +2438,12 @@ draw_player_num_lives:
beq @exit ; exit if just drew a 0, meaning no more digits to draw
@write_num_lives:
sta $06fe,y ; set ones digit
sta CPU_GRAPHICS_BUFFER-2,y ; set ones digit
txa ; transfer 10s digit to a
beq @exit ; exit without drawing 10s digit if #$00
ora #$30 ; converting number to pattern tile offset
; #$31 = 1, #$32 = 2, etc.
sta $06fd,y ; set 10s digit of num lives
sta CPU_GRAPHICS_BUFFER-3,y ; set 10s digit of num lives
@exit:
rts
@ -2461,7 +2461,7 @@ draw_stage_and_level_name:
lda CURRENT_LEVEL ; current level number
clc ; clear carry in preparation for addition
adc #$31
sta $06fe,x ; draw current level
sta CPU_GRAPHICS_BUFFER-2,x ; draw current level
lda CURRENT_LEVEL ; current level
adc #$11 ; string id = level number + 11
jmp load_bank_6_write_text_palette_to_mem ; draw text string
@ -2507,7 +2507,7 @@ draw_the_scores:
jsr calculate_score_digit ; calculate next digit and store into $02
lda $02 ; load the digit of the score to display from $02
ora #$30 ; convert from number to character to display. In Contra 30 = 0, 31 = 1, etc.
sta $06fc,x ; draw digit
sta CPU_GRAPHICS_BUFFER-4,x ; draw digit
dex ; move to the previous digit (score drawn right to left)
lda $00 ; load current low byte of score
ora $01 ; combine low byte with high byte
@ -2523,17 +2523,17 @@ draw_the_scores:
ora $02 ; see if score is #$00
beq @draw_zero_score ; handle when the score is #$00 (don't tack on ending 00s)
lda #$30 ; set the character to display to 0
sta $06fd,x ; display the character '0'
sta CPU_GRAPHICS_BUFFER-3,x ; display the character '0'
@draw_final_0_exit:
sta $06fe,x ; display the character '0'
sta CPU_GRAPHICS_BUFFER-2,x ; display the character '0'
@exit:
rts
; handle the case when player score is $00, i.e. no points were scored
@draw_zero_score:
sta $06fc,x ; this is the first decimal digit of the score, set it to '0'
sta CPU_GRAPHICS_BUFFER-4,x ; this is the first decimal digit of the score, set it to '0'
lda #$30 ; display the character '0'
bne @draw_final_0_exit ; always branch, to exit out of @draw_score_digit