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snes: enemies are moving!
problem was I was letting cc65 place the BSS and it was sticking it at $2000 which is reserved for PPU registers
This commit is contained in:
Vince Weaver
parent
58178b95cd
commit
da4593e688
@ -1,2 +1,2 @@
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.word $e1c ; Complement of checksum
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.word $f1e3 ; Unsigned 16-bit sum of ROM
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.word $e6b2 ; Complement of checksum
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.word $194d ; Unsigned 16-bit sum of ROM
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@ -1,5 +1,8 @@
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; Level 1
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;; Memory areas
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extra_sprite = $600
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;; GAME PARAMETERS
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NUM_MISSILES = 2
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NUM_ENEMIES = 6
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@ -798,17 +801,7 @@ store_enemy_kind:
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; want to store to $200 + (Y*4)
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; rep #$20 ; set A to 16-bit
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;.a16
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tyx ; copy Y to A
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; asl
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; asl ; multiply by 4
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; tax ; put in X
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; sep #$20 ; set A back to 8-bit
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;.a8
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tyx ; copy Y to X
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; determine enemy _x
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; if < 0, make random between 2->34
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@ -824,38 +817,28 @@ store_enemy_kind:
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store_init_x:
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sta $200,X ; store x value at $200+(Y*4)
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sta $200,Y ; store x value at $200+(Y*4)
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; enemy_y is always 0 by default
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inx ; store y value at $201+(Y*4)
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lda #$0
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sta $200,X
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sta $201,Y ; store y value at $201+(Y*4)
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pla ; pull enemy type off stack
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inx ; store SPRITE value to $202+(Y*4)
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sta $200,X
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sta $202,Y ; store SPRITE value to $202+(Y*4)
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lda #$24 ; noflip, pal2, priority=2
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inx
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sta $200,X ; store paramaters to $203+(Y*4)
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sta $203,Y ; store paramaters to $203+(Y*4)
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; X = (Y*4)+3
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lda #$0
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sta extra_sprite,Y ; xadd
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sta extra_sprite+1,Y ; yadd
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lda #$24
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sta extra_sprite,X ; ymin
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inx
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sta extra_sprite,X ; xmin
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inx
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stz extra_sprite,X ; yadd
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lda #$2
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inx
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stz extra_sprite,X ; xadd
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lda #2
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sta extra_sprite+2,Y ; xmin
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lda #100
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sta extra_sprite+3,Y ; xmax
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;===========================================
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@ -876,13 +859,11 @@ enemy_type_1:
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; movement proportional to level
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lda LEVEL ; xadd = level
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sta extra_sprite,X
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inx ; point to yadd
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sta extra_sprite,Y
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lsr A
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ora #$1
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sta extra_sprite,X ; yadd = level/2
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sta extra_sprite+1,y ; yadd = level/2
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jmp move_enemies
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enemy_type_2:
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@ -1063,7 +1044,7 @@ move_enemies:
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; Move Enemies! (first thing, if no new added)
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;==============================================
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ldy #$20 ; point to enemies[0]
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ldy #$80 ; point to enemies[0] (4*$20)
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handle_enemies:
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jsr is_sprite_active ; set if enemy[y].out
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@ -1078,6 +1059,22 @@ handle_enemies:
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;==========================================
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load_enemy_zero_page:
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lda extra_sprite,Y
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sta ENEMY_XADD
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lda extra_sprite+1,Y
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sta ENEMY_YADD
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lda extra_sprite+2,Y
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sta ENEMY_XMIN
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lda extra_sprite+3,Y
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sta ENEMY_XMAX
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lda $200,Y
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sta ENEMY_X
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lda $201,Y
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sta ENEMY_Y
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; ldx #ENEMY_EXPLODING
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load_to_zero_page:
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; iny ; point to exploding
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@ -1106,12 +1103,12 @@ load_to_zero_page:
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;========
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move_enemy_x:
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; clc
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; lda ENEMY_X ; X
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; adc ENEMY_XADD ; x+=xadd
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; sta ENEMY_X
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clc
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lda ENEMY_X ; X
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adc ENEMY_XADD ; x+=xadd
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sta ENEMY_X
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; lsr A
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lsr A
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; cmp ENEMY_XMIN ; are we less than xmin?
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; bmi switch_dir_enemy_x ; if so, switch direction
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@ -1119,18 +1116,18 @@ move_enemy_x:
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; cmp ENEMY_XMAX ; are we greater than xmax?
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; bpl switch_dir_enemy_x ; if so, switch direction
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; jmp move_enemy_y
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jmp move_enemy_y
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switch_dir_enemy_x:
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; switch X direction
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; lda #$0 ; load zero
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; sec
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; sbc ENEMY_XADD ; 0 - ENEMY_XADD
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; sta ENEMY_XADD ; store it back out, negated
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; jmp move_enemy_x ; re-add it in
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lda #$0 ; load zero
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sec
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sbc ENEMY_XADD ; 0 - ENEMY_XADD
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sta ENEMY_XADD ; store it back out, negated
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jmp move_enemy_x ; re-add it in
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;========
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; Move Y
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@ -1138,34 +1135,34 @@ switch_dir_enemy_x:
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move_enemy_y:
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; lda #$0 ; load in zero
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; cmp ENEMY_YADD ; compare to YADD
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lda #$0 ; load in zero
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cmp ENEMY_YADD ; compare to YADD
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; bmi no_y_special_case ; if minus, we have special case
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bmi no_y_special_case ; if minus, we have special case
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; inc ENEMY_YADD
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; bne done_enemy_y
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inc ENEMY_YADD
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bne done_enemy_y
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; lda #$0
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; sta ENEMY_XADD
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; lda #$2
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; sta ENEMY_YADD
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lda #$0
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sta ENEMY_XADD
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lda #$2
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sta ENEMY_YADD
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; increment y
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; is it > 0?
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; if not keep going
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; if so, yadd=level*2
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; jmp done_enemy_y
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jmp done_enemy_y
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no_y_special_case:
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; clc
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; lda ENEMY_Y ; get Y
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; adc ENEMY_YADD ; y+=yadd
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; sta ENEMY_Y ; store back out
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clc
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lda ENEMY_Y ; get Y
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adc ENEMY_YADD ; y+=yadd
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sta ENEMY_Y ; store back out
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; lsr A
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; lsr A
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lsr A
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lsr A
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; cmp #$12 ; is y<=12?
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; bmi done_enemy_y ; if so no need to do anything
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@ -1422,6 +1419,25 @@ enemies_xy:
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save_zp_enemy_back:
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; save zero page copy back to RAM
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lda ENEMY_XADD
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sta extra_sprite,Y
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lda ENEMY_YADD
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sta extra_sprite+1,Y
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lda ENEMY_XMIN
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sta extra_sprite+2,Y
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lda ENEMY_XMAX
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sta extra_sprite+3,Y
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lda ENEMY_X
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sta $200,Y
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lda ENEMY_Y
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sta $201,Y
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; ldx #ENEMY_EXPLODING
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; pla
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@ -1445,8 +1461,11 @@ skip_to_next_enemy:
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; pla ; get saved value of Y
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iny
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iny
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iny
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iny
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cpy #($20+NUM_ENEMIES) ; have we looped through them all?
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cpy #($80+4*NUM_ENEMIES) ; have we looped through them all?
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beq draw_the_boss ; if not, loop
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jmp handle_enemies
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@ -2612,9 +2631,9 @@ outside:
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;; *********************
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.bss
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start_bss:
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extra_sprite: .res 256
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end_bss:
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;start_bss:
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;extra_sprite: .res 256
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;end_bss:
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;============================================================================
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