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snes: Prints title screen!
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Vince Weaver
parent
a5e18f88d7
commit
3f8081a6b0
@ -18,5 +18,5 @@ tools/pcx_to_tiles_8bpp:
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cd tools && make
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clean:
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rm -f *~ *.o *.lst *.sfc
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rm -f *~ *.o *.lst *.sfc *.tiles
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cd tools && make clean
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Binary file not shown.
BIN
tb_snes/graphics/vmw_logo.pcx
Normal file
BIN
tb_snes/graphics/vmw_logo.pcx
Normal file
Binary file not shown.
@ -220,7 +220,7 @@ _Loop09:
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ldx #$8008
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stx $4300 ;Set DMA mode to fixed source, BYTE to $2180
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ldx #wram_fill_byte
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ldx #.LOWORD(wram_fill_byte)
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stx $4302 ;Set source offset
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lda #^wram_fill_byte
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sta $4304 ;Set source bank
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@ -46,15 +46,6 @@ start_program:
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sep #$20 ; mem/A = 8 bit
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.a8
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rep #$10 ; X/Y = 16 bit
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.i16
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sep #$20 ; mem/A = 8 bit
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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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;===============================================
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;===============================================
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@ -62,24 +53,28 @@ start_program:
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;===============================================
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;===============================================
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;==========================
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; Setup Background
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;==========================
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lda #$04 ; BG1 Tilemap starts at VRAM 0400
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; 0000 0100
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; aaaa aass a=0000 01 << 11 = 0800
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; ss = size of screen in tiles 00 = 32x32
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; we want the BG1 Tilemap to start at VRAM $F000 (60k)
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; Format is
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; aaaa aass a is shifted by 10 for address
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; ss = size of screen in tiles 00 = 32x32
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;
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; 1111 0000
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lda #$f0 ; BG1 Tilemap starts at VRAM $F000
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sta $2107 ; bg1 src
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; 0000 0100
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; aaaa bbbb a= BG2 tiles, b= BG1 tiles
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; bbbb<<13
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; 0000 0000
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; our BG1 tiles are stored starting in VRAM $0000
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lda #$04
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sta $210b ; bg1 tile data starts at VRAM 8000
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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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@ -88,11 +83,11 @@ start_program:
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.i16
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stz $2121 ; CGRAM color-generator read/write address
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ldy #$0020 ; we only have 16 colors / 32 bytes
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ldy #$0200 ; we have 256 colors / 512 bytes
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ldx #$0000 ; pointer
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copypal:
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; lda tile_palette, x ; load byte of palette
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lda f:tile_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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@ -109,23 +104,23 @@ copypal:
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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 #$4000 ;
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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 0x8000
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; multiply by 2, so 0x0000
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ldy #$1690 ; Copy 361 tiles, which are 32 bytes each
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; 8x8 tile with 4bpp (four bits per pixel)
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ldy #$7000 ; Copy 896 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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; (361*32)/2 = 5776 = 0x1690
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; (896*64)/2 = 28672 = 0x7000
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ldx #$0000
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copy_tile_data:
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lda f: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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lda f: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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;=====================
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@ -165,22 +160,20 @@ copy_font_data:
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clear_linear_tilemap:
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lda #$0400 ; we set tilemap to be at VRAM 0x0400 earlier
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lda #$f000 ; we set tilemap to be at VRAM 0xf000 earlier
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sta $2116
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ldy #$0000 ; clear counters
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ldx #$ffff
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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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;
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; 0001 1000
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; vhop ppcc
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; so 1800 = v=0 h=0 o=0 ppp = 2
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; c=0x0
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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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@ -192,20 +185,8 @@ fill_screen_loop:
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sta $2118
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iny
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inx
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cpx #30
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bne no_skip
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lda #$0
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sta $2118
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sta $2118
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ldx #0
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no_skip:
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cpy #$0169 ; 30x12 = 360 = 0x168
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cpy #$0380 ; 32x28 = 896 = 0x380
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bne fill_screen_loop
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@ -213,53 +194,6 @@ no_skip:
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; Write String to Background
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put_string:
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lda #$05a9 ; set VRAM address
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; 0400 = upper left (0,0)
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; 0420 = (0,1)
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; 05a0 = (0,13)
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; 05a9 = (9,13)
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sta $2116 ; set VRAM r/w address
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; 2116 = 05
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; 2117 = a9
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ldy #$000d ; length of string
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ldx #$0000 ; string index
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lda #$0200 ; clear A
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copy_string:
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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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lda hello_string, x ; load string character
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; while leaving top 8-bits alone
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beq done_copy_string
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sec
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sbc #$20
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rep #$20 ; set accumulator back to 16 bit
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.a16
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sta $2118 ; 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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inx ; increment string pointer
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bra copy_string
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done_copy_string:
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setup_video:
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@ -291,8 +225,8 @@ setup_video:
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; abcd = 8 (0) or 16 width for BG1234
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; e = priority for BG3
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; fff = background mode
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lda #$01
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sta $2105 ; set Mode 1
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lda #$04
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sta $2105 ; set Mode 4
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; a000 bbbb
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; a = screen on/off (0=on), ffff = brightness
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@ -305,12 +239,12 @@ setup_video:
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; sta $4200 ;
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main_loop:
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overflowing:
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; repeat forever
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; stp?
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bra main_loop
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bra overflowing
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;============================================================================
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@ -321,9 +255,13 @@ wram_fill_byte:
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hello_string:
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.asciiz "HELLO,_WORLD!"
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.segment "HIGHROM"
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;tb_font:
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;.include "tbfont.inc"
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.include "tb1_title.tiles"
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.segment "BSS"
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fx:
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@ -340,23 +278,23 @@ logo_pointer:
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screen_byte:
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.res 8*4 ; 8 bytes, times four
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tile_data:
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.res 32
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tile_data2:
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.res (30*12)*32
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output:
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.res 4096
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.segment "CARTINFO"
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.byte "TOM BOMBEM 1 " ; Game Title
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.byte $01 ; 0x01:HiRom, 0x30:FastRom(3.57MHz)
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.byte $05 ; ROM Size (2KByte * N)
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.byte $00 ; RAM Size (8KByte * N)
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.word $0001 ; Developper ID ?
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.byte $00 ; Version
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.byte $7f, $73, $80, $8c ; Security Key ?
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.byte $ff, $ff, $ff, $ff ; Security Key ?
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.byte "TOM BOMBEM 1 " ; Game Title (21 bytes)
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.byte $21 ; ROM Layout
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; 0x20:LowRom
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; 0x21:HiRom
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; 0x30/0x31:FastRom
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.byte $00 ; Cartridge Type (00 == only ROM)
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.byte $09 ; ROM Size (2^N KB)
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.byte $00 ; RAM Size
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.byte $01 ; Country Code (1=NTSC,2=PAL)
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.byte $00 ; License Code (0=unassigned)
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.byte $00 ; Version
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.byte $7f, $73, $80, $8c ; Unsigned 16-bit sum of ROM
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.byte $ff, $ff, $ff, $ff ; Complement of checksum
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; Interrupt Vectors!
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@ -374,6 +312,6 @@ output:
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.word $0000 ;
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.word $0000 ; Emulation:ABORT
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.word $0000 ; Emulation:NMI
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.word Reset ; Emulation:RESET
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.word .LOWORD(Reset) ; Emulation:RESET
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.word $0000 ; Emulation:IRQ/BRK
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