mirror of
https://github.com/deater/tb1.git
synced 2025-01-02 22:31:47 +00:00
snes: use common DMA loading routines
This makes loading the compressed tilemaps a bit more streamlined.
This commit is contained in:
Vince Weaver
parent
011aeb54cc
commit
4941aa8cc9
@ -1,2 +1,2 @@
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.word $5ea8 ; Complement of checksum
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.word $a157 ; Unsigned 16-bit sum of ROM
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.word $702f ; Complement of checksum
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.word $8fd0 ; Unsigned 16-bit sum of ROM
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Binary file not shown.
@ -15,8 +15,48 @@ display_opening:
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.a8
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;==========================
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; Setup Backgrounds
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; Load Opening Screen Palette
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;==========================
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stz $2121 ; start with color 0
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ldy #(128*2) ; we have 128 colors
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lda #^vmw_logo_palette
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ldx #.LOWORD(vmw_logo_palette)
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jsr svmw_load_palette
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;==========================
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; Load Opening Tile Data
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;==========================
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lda #$0000 ;
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sta $2116 ; set adddress for VRAM read/write
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; multiply by 2, so 0x0000
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lda #^vmw_logo_tile_data
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ldx #.LOWORD(vmw_logo_tile_data)
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ldy #$12c0 ; Copy 75 tiles, which are 64 bytes each
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; 8x8 tile with 8bpp (four bytess per pixel)
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; (75*64) = 4800 = 0x12c0
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jsr svmw_load_vram
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;===================================
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; Load Opening Tilemap
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;===================================
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; 6 down, 0 right = (6*32) = 96 = 0xc0
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; 1111 0000 1100 0000
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ldx #$78c0 ; we set tilemap to be at VRAM 0xf000 earlier
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; f0c0
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stx $2116
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lda #^vmw_logo_tilemap
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ldx #.LOWORD(vmw_logo_tilemap)
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ldy #640 ; 32*10*2 = 640 tiles
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jsr svmw_load_vram
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; we want the BG1 Tilemap to start at VRAM $F000 (60k)
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; Format is
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@ -28,6 +68,7 @@ display_opening:
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lda #$78 ; BG1 Tilemap starts at VRAM $F000
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sta $2107 ; bg1 src
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; we want the BG2 Tilemap to start at VRAM $F800
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; Format is
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; aaaa aass a is shifted by 10 for address
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@ -50,58 +91,6 @@ display_opening:
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;==============
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; Load Palettes
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;==============
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.a8
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.i16
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stz $2121 ; CGRAM color-generator read/write address
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ldy #$00fe ; we have 127 colors / 512 bytes
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ldx #$0000 ; pointer
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opening_copypal:
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lda f:vmw_logo_palette, x ; load byte of palette
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sta $2122 ; store to color generator
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inx
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dey
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bne opening_copypal
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; make last color white
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lda #$ff
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sta $2122
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lda #$7f
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sta $2122
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;=====================
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; Load Tile Data
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;=====================
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; replace with DMA!
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rep #$20 ; set accumulator/mem to 16bit
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.a16
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.i16
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lda #$0020 ;
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sta $2116 ; set adddress for VRAM read/write
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; multiply by 2, so 0x0000
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ldy #$2580 ; Copy 300 tiles, which are 64 bytes each
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; 8x8 tile with 8bpp (four bits per pixel)
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; in 2-byte chunks, so
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; (300*64)/2 = 9600 = 0x2580
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ldx #$0000
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opening_copy_tile_data:
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lda f:vmw_logo_tile_data, x
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sta $2118 ; write the data
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inx ; increment by 2 (16-bits)
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inx
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dey ; decrement counter
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bne opening_copy_tile_data
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;=====================
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@ -132,63 +121,8 @@ opening_copy_font_data:
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bne opening_copy_font_data
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;===================================
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; clear background to linear tilemap
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;===================================
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.a16
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.i16
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opening_clear_linear_tilemap:
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; 6 down, 1 right = (6*32)+1 = 97 = 0xc1
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; 1111 0000 1100 0001
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lda #$78c1 ; we set tilemap to be at VRAM 0xf000 earlier
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; f0c1
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sta $2116
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ldy #$0001 ; clear counters
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; store to VRAM
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; the bottom 8 bits is the tile to use
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; the top 8 bits is vhopppcc
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; vert flip, horiz flip o=priority
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; p = palette, c=top bits of tile#
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ldx #$0001
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; 8-bit color so ppp is 0
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; and we have a linear tilemap
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; 0000 0000
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; vhop ppcc cccc cccc
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.a16
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.i16
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opening_fill_screen_loop:
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cpx #31
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bne opening_not_thirty
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stz $2118
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stz $2118
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ldx #$0000
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bra opening_check_end
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opening_not_thirty:
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tya
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sta $2118
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iny
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opening_check_end:
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inx
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cpy #$0140 ; (10*32) = 0x140
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bne opening_fill_screen_loop
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; Write String to Background
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opening_put_string:
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@ -104,15 +104,6 @@ svmw_transfer_sprite:
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rts
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;==================================
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;==================================
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; Load Compressed Tilemap
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; This loads a tilemap made with my pcx_to_compressed_tilemap tool
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;==================================
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;==================================
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;==============
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;==============
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; Load Palette
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@ -142,3 +133,35 @@ svmw_load_palette:
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plp ; restore status
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rts
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;===================
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;===================
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svmw_load_vram:
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;===================
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;===================
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; set 2116/2117 for destination in advance
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; A:X = address of data
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; Y = length
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php ; save status on stack
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rep #$10 ; 16 bit X/Y
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.i16
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sep #$20 ; 8 bit A
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.a8
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stx $4302 ; Store data offset into DMA source offset
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sta $4304 ; Store data bank into DMA source bank
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sty $4305 ; Store size of data block
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lda #$01 ; Set DMA Mode (word, normal increment)
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sta $4300 ;
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lda #$18 ; Set destination register ($2118 - VRAM Write)
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sta $4301
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lda #$01 ; Initiate DMA transfer
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sta $420b
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plp ; restore status
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rts
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@ -43,9 +43,9 @@ display_title:
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lda #$00
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sta $210b ; bg1 tile data starts at VRAM 0000
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;==============
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; Load Palettes
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;==============
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;==========================
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; Load Title Screen Palette
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;==========================
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stz $2121 ; start with color 0
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ldy #(256*2) ; we have 256 colors
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lda #^title_screen_palette
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@ -53,77 +53,46 @@ display_title:
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jsr svmw_load_palette
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;=====================
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; Load Tile Data
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; Load Title Tile Data
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;=====================
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; replace with DMA!
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rep #$20 ; set accumulator/mem to 16bit
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.a16
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.i16
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lda #$0000 ;
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sta $2116 ; set adddress for VRAM read/write
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ldx #$0000 ;
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stx $2116 ; set adddress for VRAM read/write
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; multiply by 2, so 0x0000
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ldy #$3bc0 ; Copy 478 tiles, which are 64 bytes each
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; 8x8 tile with 8bpp (four bits per pixel)
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; in 2-byte chunks, so
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; (478*64)/2 = 15296 = 0x3bc0
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lda #^title_screen_tile_data
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ldx #.LOWORD(title_screen_tile_data)
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ldy #$7780 ; Copy 478 tiles, which are 64 bytes each
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; 8x8 tile with 8bpp
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; (478*64) = 30592 = 0x7780
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ldx #$0000
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copy_tile_data:
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lda f:title_screen_tile_data, x
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sta $2118 ; write the data
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inx ; increment by 2 (16-bits)
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inx
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dey ; decrement counter
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bne copy_tile_data
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jsr svmw_load_vram
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;===================================
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; Load Title Tile Map
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;===================================
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ldx #$7000 ;
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stx $2116 ; set adddress for VRAM read/write
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; multiply by 2, so 0xe000
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lda #^title_screen_tilemap
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ldx #.LOWORD(title_screen_tilemap)
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ldy #$0700 ; 32x28 = 896 * 2 = 0x700
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jsr svmw_load_vram
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;===================================
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; Load Tile Map
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; Setup Video
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;===================================
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.a16
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.i16
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clear_linear_tilemap:
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lda #$f000 ; we set tilemap to be at VRAM 0xf000 earlier
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sta $2116
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ldx #$0000 ; clear offset
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fill_screen_loop:
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lda f:title_screen_tilemap,X
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sta $2118
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inx
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inx
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cpx #$0700 ; 32x28 = 896 * 2 = 0x700
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bne fill_screen_loop
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setup_video:
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title_setup_video:
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sep #$20 ; set accumulator to 8 bit
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; as we only want to do an 8-bit load
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.a8
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.i16
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; Enable sprite
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; sssnnbbb
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; ss = size (8x8 in our case)
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; nn = name
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; bb = base selection, VRAM >> 14
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; lda #%00000010 ; point at 0x4000 in VRAM
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; sta $2101
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; 000abcde
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; a = object, b=BG4 c=BG3 d=BG2 e=BG1
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; lda #%00010001 ; Enable BG1
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lda #%00000001 ; Enable BG1
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sta $212c
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@ -175,5 +144,3 @@ title_joypad_read:
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.include "tb1_title.tiles"
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@ -242,8 +242,8 @@ static int vmwLoadPCX(int pcx_fd) {
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/* print tile data */
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for(x=0;x<max_planes/2;x++) {
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printf("\t; Tile %d %d, Plane %d Plane %d\n",xchunk,ychunk,
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x*2,(x*2)+1);
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printf("\t; Tile #%d %d %d, Plane %d Plane %d\n",compressed_tiles,
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xchunk,ychunk,x*2,(x*2)+1);
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for(y=0;y<Y_CHUNKSIZE;y++) {
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printf("\t.word $%04x\n",temp_tile[y][x]);
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}
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@ -323,6 +323,20 @@ static int vmwLoadPCX(int pcx_fd) {
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}
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}
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#if 0
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printf("\n");
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printf("%s_info:\n",symbol_name);
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printf("%s_tile_data_addr:\t.word .LOWORD(%s_tile_data)\n",symbol_name,
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symbol_name);
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printf("%s_tile_data_len:\t.word %d\n",symbol_name,100);
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printf("%s_tilemap_addr:\t.word .LOWORD(%s_tilemap)\n",symbol_name,
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symbol_name);
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printf("%s_tilemap_len:\t.word %d\n",symbol_name,100);
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printf("%s_palette_addr:\t.word .LOWORD(%s_palette)\n",symbol_name,
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symbol_name);
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printf("%s_palette_len_bytes:\t.word %d\n",symbol_name,512);
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#endif
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return 0;
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}
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