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snes: implement compressed tilemap tool 

This reduced the title screen from 896 tiles to 478 tiles
This commit is contained in:
Vince Weaver 2013-01-21 16:08:13 -05:00
parent a064de86c9
commit b08cd34114
3 changed files with 112 additions and 16 deletions
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4
tb_snes/checksum.inc
View File

@ -1,2 +1,2 @@
.word $2797 ; Complement of checksum
.word $d868 ; Unsigned 16-bit sum of ROM
.word $dfde ; Complement of checksum
.word $2021 ; Unsigned 16-bit sum of ROM

4
tb_snes/title_screen.s
View File

@ -75,10 +75,10 @@ copypal:
sta $2116 ; set adddress for VRAM read/write
; multiply by 2, so 0x0000
ldy #$7000 ; Copy 896 tiles, which are 64 bytes each
ldy #$3bc0 ; Copy 478 tiles, which are 64 bytes each
; 8x8 tile with 8bpp (four bits per pixel)
; in 2-byte chunks, so
; (896*64)/2 = 28672 = 0x7000
; (478*64)/2 = 15296 = 0x3bc0
ldx #$0000
copy_tile_data:

120
tb_snes/tools/pcx_to_compressed_tilemap_8bpp.c
View File

@ -7,6 +7,18 @@
#include <sys/stat.h> /* for file modes */
#include <stdlib.h> /* exit() */
static unsigned int hflip_byte(unsigned int byte) {
int new_byte=0,i;
for(i=0;i<8;i++) {
new_byte<<=1;
if (byte&(1<<i)) new_byte|=1;
}
return new_byte;
}
/* Convert to 15-bpp bgr */
static int rgb2bgr(int r,int g, int b) {
int r2,g2,b2,bgr;
@ -26,10 +38,8 @@ static char symbol_name[BUFSIZ]="temp";
#define MAX_TILE_Y 32
static unsigned short tilemap[MAX_TILE_X*MAX_TILE_Y]; /* 2k */
static int uncompressed_size=0;
static int compressed_size=0;
static unsigned short tiledata[MAX_TILE_X][MAX_TILE_Y][8][4];
static unsigned short tiledata_hflip[MAX_TILE_X][MAX_TILE_Y][8][4];
static unsigned short tiledata[MAX_TILE_X*MAX_TILE_Y][8][4];
static unsigned short tiledata_hflip[MAX_TILE_X*MAX_TILE_Y][8][4];
static unsigned short temp_tile[8][4];
static int total_tiles=0;
static int compressed_tiles=0;
@ -204,26 +214,112 @@ static int vmwLoadPCX(int pcx_fd) {
// printf("\t.word $%02x%02x\n",plane7,plane6);
}
for(x=0;x<4;x++) {
printf("\t; Tile %d %d, Plane %d Plane %d\n",xchunk,ychunk,
x*2,(x*2)+1);
for(y=0;y<Y_CHUNKSIZE;y++) {
printf("\t.word $%04x\n",temp_tile[y][x]);
int i,plane,v=0,h=0,o=0,pal=0,found_tile=0,found=0,match;
/* see if the new tile matches an existing one */
for(i=0;i<compressed_tiles;i++) {
/* see if matches direct */
match=1;
for(plane=0;plane<4;plane++) {
for(y=0;y<8;y++) {
if (temp_tile[y][plane]!=tiledata[i][y][plane]) match=0;
}
}
if (match) {
v=0; h=0;
found_tile=i;
found=1;
break;
}
/* see if matches with vflip */
match=1;
for(plane=0;plane<4;plane++) {
for(y=0;y<8;y++) {
if (temp_tile[y][plane]!=tiledata[i][7-y][plane]) match=0;
}
}
if (match) {
v=1; h=0;
found_tile=i;
found=1;
break;
}
/* see if matches with hflip */
match=1;
for(plane=0;plane<4;plane++) {
for(y=0;y<8;y++) {
if (temp_tile[y][plane]!=tiledata_hflip[i][y][plane]) match=0;
}
}
if (match) {
v=0; h=1;
found_tile=i;
found=1;
break;
}
/* see if matches with hflip and vflip */
match=1;
for(plane=0;plane<4;plane++) {
for(y=0;y<8;y++) {
if (temp_tile[y][plane]!=tiledata_hflip[i][7-y][plane]) match=0;
}
}
if (match) {
v=1; h=1;
found_tile=i;
found=1;
break;
}
}
int v=0,h=0,o=0,pal=0;
if (!found) {
/* print tile data */
for(x=0;x<4;x++) {
printf("\t; Tile %d %d, Plane %d Plane %d\n",xchunk,ychunk,
x*2,(x*2)+1);
for(y=0;y<Y_CHUNKSIZE;y++) {
printf("\t.word $%04x\n",temp_tile[y][x]);
}
}
found_tile=compressed_tiles;
/* put data in lookup table */
for(plane=0;plane<4;plane++) {
for(y=0;y<8;y++) {
tiledata[compressed_tiles][y][plane]=temp_tile[y][plane];
}
}
/* put hflip in lookup table */
for(plane=0;plane<4;plane++) {
for(y=0;y<8;y++) {
tiledata_hflip[compressed_tiles][y][plane]=
(hflip_byte( (temp_tile[y][plane]>>8)&0xff)<<8) |
hflip_byte( temp_tile[y][plane]&0xff);
}
}
compressed_tiles++;
}
else {
}
tilemap[total_tiles]=
( ((v&1)<<15) |
((h&1)<<14) |
((o&1)<<13) |
((pal&7)<<10) |
(total_tiles&0x3ff));
(found_tile&0x3ff));
total_tiles++;
compressed_tiles++;
}
}