dos33fsprogs/hgr-utils/shape_table.c

233 lines
5.1 KiB
C
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/* Creates an AppleSoft BASIC shape table */
/* See the AppleSoft manual for info on how this works */
/* Other online info (I'm looking at you, atariarchives.org) */
/* is inaccurate */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define MAX_SIZE 8192 /* not really, but anything larger would be crazy */
static unsigned char table[MAX_SIZE];
static void set_offset(int current_shape,int current_offset) {
table[2+(current_shape*2)]=current_offset&0xff;
table[2+(current_shape*2)+1]=(current_offset>>8)&0xff;
}
#define LOC_A 0
#define LOC_B 1
#define LOC_C 2
static void warn_if_zero(unsigned char byte, int line) {
/* Check to see if we're accidentally ignoring bytes */
if (byte==0) {
fprintf(stderr,
"Warning, all-0 byte will be ignored on line %d!\n",
line);
}
if ((byte&0xf8)==0) {
fprintf(stderr,
"Warning, ignoring C and B due to 0 on line %d!\n",
line);
}
}
static void print_usage(char *exe) {
printf("Usage:\t%s [-h] [-a] [-b]\n\n",exe);
printf("\t-h\tprint this help message\n");
printf("\t-a\toutput shape table in applesoft BASIC format\n");
printf("\t-b\toutput shape table in binary format for BLOADing\n");
printf("\n");
exit(1);
}
int main(int argc, char **argv) {
char string[BUFSIZ];
char *result;
int table_size=0;
int num_shapes=0;
int current_offset=0,current_shape=0;
int i,line=1;
int command=0,sub_pointer;
int output_binary=0;
if (argc<2) {
output_binary=0;
}
else {
if (argv[1][0]=='-') {
switch(argv[1][1]) {
case 'h':
print_usage(argv[0]);
break;
case 'b':
output_binary=1;
break;
case 'a':
output_binary=0;
break;
default:
printf("Unknown options %s\n",argv[1]);
print_usage(argv[0]);
}
}
}
while(1) {
result=fgets(string,BUFSIZ,stdin);
if (result==NULL) break;
line++;
/* skip comments and blank lines */
if ((string[0]=='#') || (string[0]=='\n')) continue;
sscanf(string,"%d",&num_shapes);
break;
}
//fprintf(stderr,"Num shapes: %d\n",num_shapes);
table[0]=num_shapes;
table[1]=0;
current_shape=0;
current_offset=2+2*(num_shapes);
for(current_shape=0;current_shape<num_shapes;current_shape++) {
set_offset(current_shape,current_offset);
/* Find START */
while(1) {
result=fgets(string,BUFSIZ,stdin);
if (result==NULL) break;
line++;
/* skip comments and blank lines */
if ((string[0]=='#') || (string[0]=='\n')) continue;
if (strstr(string,"START")) break;
}
/* READ DATA */
sub_pointer=LOC_A;
while(1) {
result=fgets(string,BUFSIZ,stdin);
if (result==NULL) break;
line++;
/* skip comments and blank lines */
if ((string[0]=='#') || (string[0]=='\n')) continue;
if (strstr(string,"STOP")) break;
/* yes, this is inefficient... */
if (strstr(string,"NUP")) command=0;
else if (strstr(string,"NRT")) command=1;
else if (strstr(string,"NDN")) command=2;
else if (strstr(string,"NLT")) command=3;
else if (strstr(string,"UP")) command=4;
else if (strstr(string,"RT")) command=5;
else if (strstr(string,"DN")) command=6;
else if (strstr(string,"LT")) command=7;
else fprintf(stderr,"Unknown command %s",string);
if (sub_pointer==LOC_A) {
table[current_offset]=(command&0x7);
sub_pointer=LOC_B;
}
else if (sub_pointer==LOC_B) {
table[current_offset]|=((command&0x7)<<3);
sub_pointer=LOC_C;
}
else {
/* Try to fit in LOC_C. This can only hold no-draw moves */
/* Also a LOC_C of 0 is ignored */
if ((command&0x4) || (command==0)) {
/* Write to LOC_A instead */
warn_if_zero(table[current_offset],line);
current_offset++;
table[current_offset]=(command&0x7);
sub_pointer=LOC_B;
}
else {
/* write to LOC_C */
table[current_offset]|=((command&0x3)<<6);
warn_if_zero(table[current_offset],line);
current_offset++;
sub_pointer=LOC_A;
}
}
}
if (sub_pointer!=LOC_A) current_offset++;
table[current_offset]=0; current_offset++;
}
table_size=current_offset;
if (output_binary) {
unsigned char header[4];
int offset=0x6000;
header[0]=offset&0xff;
header[1]=(offset>>8)&0xff;
header[2]=table_size&0xff;
header[3]=(table_size>>8)&0xff;
fprintf(stderr,"Be sure to POKE 232,%d : POKE 233,%d\n"
"\tto let applesoft know the location of the table\n",
offset&0xff,(offset>>8)&0xff);
fwrite(header,sizeof(unsigned char),4,stdout);
fwrite(table,sizeof(unsigned char),table_size,stdout);
}
else {
/* put near highmem */
int address=0x1ff0-table_size;
printf("10 HIMEM:%d\n",address);
printf("20 POKE 232,%d:POKE 233,%d\n",(address&0xff),(address>>8)&0xff);
printf("30 FOR L=%d TO %d: READ B:POKE L,B:NEXT L\n",
address,(address+table_size)-1);
printf("35 HGR:ROT=0:SCALE=2\n");
printf("40 FOR I=1 TO %d: XDRAW I AT I*10,100:NEXT I\n",
num_shapes);
printf("90 END\n");
for(i=0;i<current_offset;i++) {
if(i%10==0) printf("%d DATA ",100+i/10);
printf("%d",table[i]);
if ((i%10==9)||(i==current_offset-1)) printf("\n");
else printf(",");
}
}
return 0;
}