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snes: can now move ship left/right
This commit is contained in:
Vince Weaver
parent
db9e66cc86
commit
6d9412fdae
@ -1,2 +1,2 @@
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.word $3851 ; Complement of checksum
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.word $c7ae ; Unsigned 16-bit sum of ROM
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.word $3fcf ; Complement of checksum
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.word $c030 ; Unsigned 16-bit sum of ROM
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@ -1,5 +1,9 @@
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; Level 1
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; Page zero locations
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ball_x = $0000
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joypad1 = $0000
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joypad2 = $0001
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shipx = $0002
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.setcpu "65816"
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@ -16,20 +20,6 @@ level_1:
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rep #$10 ; X/Y = 16 bit
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.i16
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;==========================
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; Setup VBLANK routine
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;==========================
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; sei ; disable interrupts
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; lda #level1_vblank
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; sta vblank_vector
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; cli ; enable interrupts
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;==========================
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; Setup Background
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;==========================
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@ -123,38 +113,37 @@ level_1:
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jsr svmw_load_vram
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;
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; Init sprites to be offscreen
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jsr svmw_move_sprites_offscreen
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; Set our sprite active
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; assume 544 byte sprite table in $0000
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; assume 544 byte sprite table in $0200
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sep #$20 ; mem/A = 8 bit
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.a8
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lda #104
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sta $0000 ; set sprite 0 X to 0
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sta $0200 ; set sprite 0 X to 0
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lda #192 ; set sprite 0 Y to 100
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sta $0001
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sta $0201
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; Xxxxxxxxx yyyyyyy cccccccc vhoopppN
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;
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stz $0002 ; set sprite 0
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stz $0202 ; set sprite 0
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; 00000000
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; no flip, priority 0, N=0 palette=0 (128)
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lda #$00
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sta $0003
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sta $0203
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; X high bit = 0 for sprite 0
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; sprite size = 0 (smaller)
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lda #%01010110
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sta $0200
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sta $0400
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; Enable sprite
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; sssnnbbb
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@ -181,29 +170,70 @@ level1_setup_video:
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sta $2105
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lda #$11 ; Enable BG1 and sprites
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; lda #$01 ; Enable BG1
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sta $212c
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stz $212d ; disable subscreen
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lda #$0f
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sta $2100 ; Turn on screen, full Brightness
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; lda #$81 ; Enable NMI (VBlank Intterupt) and joypads
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; sta $4200 ;
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lda #$00 ; Disable NMI (VBlank Interrupt) and joypads
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sta $4200 ;
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;==========================
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; Setup VBLANK routine
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;==========================
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ldx #level1_vblank
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stx vblank_vector
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lda #$81 ; Enable NMI (VBlank Interrupt) and joypads
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sta $4200 ;
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jsr svmw_fade_in
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; lda #$0f
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; sta $2100 ; Turn on screen, full Brightness
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; init vars
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lda #104
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sta shipx
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level1_loop:
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; all work done in interrupt handler
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wai ; wait for interrupt
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; handle keypress
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lda joypad1
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check_left:
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bit #$02
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beq check_right
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dec shipx
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bpl check_right
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stz shipx
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check_right:
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bit #$01
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beq no_keypress
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inc shipx
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no_keypress:
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; update OAM
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lda shipx
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sta $0200 ; set sprite 0 X to shipx
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bra level1_loop
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;=============================
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; VBLank Routine
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; All the action happens here
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; Level 1 VBLank Routine
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;=============================
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level1_vblank:
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@ -221,75 +251,22 @@ level1_vblank:
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l1_joypad_read:
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lda $4212 ; get joypad status
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and #%00000001 ; if joy is not ready
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bne l1_joypad_read ; wait
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and #$01 ; if joy is not ready
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bne l1_joypad_read ; wait
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lda $4219 ; read joypad (BYSTudlr)
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sta joypad1
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and #%11110000 ; see if a button pressed
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bne done_vblank ; if so, skip and don't move ball
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lda $4218 ; read joypad (AXLRiiii)
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sta joypad2
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done_joypad:
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lda #^x_direction ; get bank for x_direction var (probably $7E)
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pha ;
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plb ; set the data bank to the one containing x_direction
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lda ball_x ; get current ball X value
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; in the zero page, which is mirrored on SNES
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ldx x_direction ; get x_direction 0=right, 1=left
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bne ball_left ; if 1 skip ahead to handle going left
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ina ; ball_x += 2
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ina
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cmp #248 ; have we reached right side?
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bne done_moving ; if not, keep moving right
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ldx #1 ; if so, switch to moving left
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bra done_moving
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ball_left:
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dea ; ball_x -= 2
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dea
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bne done_moving ; if not at zero, keep moving left
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ldx #0 ; hit wall, switchto moving right
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done_moving:
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sta ball_x ; save ball_x co-ord
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stx x_direction ; save x_direction
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;=======================================
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; Update the sprite info structure (OAM)
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;=======================================
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.a8
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lda #$0 ; set data bank back to 0
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pha
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plb
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; Setup DMA transfer to copy our OAM structure in the zero page
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; into the actual OAM
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stz $2102 ; set OAM address to 0
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stz $2103
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ldy #$0400
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sty $4300 ; CPU -> PPU, auto increment, write 1 reg, $2104 (OAM Write)
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stz $4302
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stz $4303 ; source offset
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ldy #$0220
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sty $4305 ; number of bytes to transfer
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lda #$7E
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sta $4304 ; bank address = $7E (work RAM)
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lda #$01
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sta $420B ;start DMA transfer
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jsr svmw_transfer_sprite
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done_vblank:
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@ -303,7 +280,6 @@ done_vblank:
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pla
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plb
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sep #$20
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plp
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rti ; return from interrupt
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@ -318,6 +294,3 @@ done_vblank:
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.include "level1_pal0.sprites"
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.include "level1_background.tiles"
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.segment "BSS"
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x_direction: .word 0
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@ -109,7 +109,7 @@ init_snes:
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; $2180 - read/write WRAM register, no initialization required
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; $2181-$2183 - WRAM address, no initialization required
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; $4016-$4017 - serial JoyPad read registers, no need to initialize
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stz $4016 ; $4016-$4017 - serial JoyPad read registers, no need to initialize
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stz $4200 ; disable timers, v-blank interrupt, joypad register
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@ -8,6 +8,7 @@
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; Move Sprites Offscreen
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;====================================
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;====================================
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; assumes we have RAM copy of OAM at $0200
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svmw_move_sprites_offscreen:
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@ -30,7 +31,7 @@ svmw_move_sprites_offscreen:
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; ppp = palette
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; s = sprite size
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clear_xy:
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sta $0000,X ; page 0?
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sta $0200,X ; assume at $0200
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inx
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inx
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inx
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@ -41,7 +42,7 @@ clear_xy:
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ldx #$0000
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lda #$5555 ; set high bit of X, effective setting X to 256
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set_top:
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sta $0200, X ; writing to top of screen
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sta $0400, X ; writing to top of screen
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inx ; increment
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inx
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cpx #$0020 ; put all 32 values
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@ -53,7 +54,7 @@ set_top:
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;========================================
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;========================================
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; transfer sprite
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; assumes sprite_data starts at $7e:0000
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; assumes sprite_data starts at $7e:0200
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;========================================
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;========================================
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@ -87,9 +88,9 @@ svmw_transfer_sprite:
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sty $4300 ; CPU -> PPU, auto increment,
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; write 1 reg, $2104 (OAM Write)
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stz $4302
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stz $4303 ; source offset in RAM (low/high)
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; $0000
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ldx #$0200
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stx $4302 ; source offset in RAM (low/high)
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; $0200
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ldy #$0220
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sty $4305 ; number of bytes to transfer
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@ -79,7 +79,7 @@ wram_fill_byte:
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.word $0000 ; Native:BRK
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.word $0000 ; Native:ABORT
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vblank_vector:
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.word vblank_nop ; Native:NMI
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.word level1_vblank ; Native:NMI
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.word $0000 ;
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.word $0000 ; Native:IRQ
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