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#include <atari.h>
#include <string.h>
#include "addrs.h"
#include "screen.h"
#define SDLST ((u16 *)0x0230)
char scr_status[MAX_SCREENS];
/* the screen that's currently displaying */
char scr_current;
/* the screen that's currently being written to */
char scr_active;
static char scr_names[7][32];
static char scr_topics[7][40];
static char xpos;
void scr_waitvcount(u8 c) {
while(ANTIC.vcount < c)
/* NOP */;
}
static void scr_clear(char s) {
memset(screen_addrs[s], 0, SCREEN_SIZE);
memset(scr_names[s], 0, 32);
memset(scr_topics[s], 0, LINE_SIZE);
}
static void scr_scroll(char s) {
memmove(screen_addrs[s], screen_addrs[s] + 40, 880);
memset(screen_botlines[s], 0, 40);
}
void scr_init(void) {
int i, old_dma;
old_dma = OS.sdmctl;
OS.sdmctl = 0;
scr_waitvcount(112); /* after the last GR.0 line */
*SDLST = DLIST_ADDR;
OS.chbas = FONT_ADDR_HI;
for(i = 0; i < MAX_SCREENS; i++) {
scr_clear(i);
scr_status[i] = SCR_UNUSED;
}
strcpy(scr_names[0], "[server]");
strcpy(scr_names[1], "[private]");
scr_status[0] = scr_status[1] = SCR_INACTIVE;
OS.sdmctl = old_dma;
scr_display(0);
}
char scr_create(const char *name, char display) {
int i;
for(i = 0; i < MAX_SCREENS; i++) {
if(scr_status[i] == SCR_UNUSED) {
strcpy(scr_names[i], name);
scr_status[i] = SCR_INACTIVE;
scr_topics[i][0] = '\0';
if(display)
scr_display(i);
else
scr_display(scr_current);
return i;
}
}
// scr_print_current("Can't create window (all in use)\n");
return 0xff;
}
void scr_destroy(char s) {
/* <2 because screens 0 and 1 (server and private) cannot be destroyed */
if(s < 2 || s >= MAX_SCREENS)
return;
scr_status[s] = SCR_UNUSED;
if(scr_current == s)
scr_display(0);
}
void scr_set_topic(char s, const char *topic) {
strncpy(scr_topics[s], topic, 40);
}
void scr_display(char s) {
if(s >= MAX_SCREENS)
return;
/* leave this out, for testing
if(scr_status[s] == SCR_UNUSED)
return;
*/
scr_status[s] = SCR_INACTIVE;
scr_current = s;
scr_waitvcount(112);
*dlist_top_lms = (u16)screen_addrs[s];
scr_show_status(s);
}
void scr_show_status(char s) {
int i;
char *p, sc;
status_box[0] = s + 177; /* inverse number */
status_box[1] = ':';
strncpy(status_box + 2, scr_names[s], 32);
strncpy(status_box + 40, scr_topics[s], 40);
p = status_box + 33;
for(i = 0; i < MAX_SCREENS; i++) {
switch(scr_status[i]) {
case SCR_ACTIVE:
sc = 128 | ('1' + i); break;
case SCR_INACTIVE:
sc = '1' + i; break;
default:
sc = ' ';
}
*p++ = sc;
}
scr_waitvcount(112);
*dlist_bottom_lms = (u16)status_box;
}
void scr_refresh(void) {
scr_display(scr_current);
}
char scr_getbyname(const char *name) {
char i;
for(i = 2; i < MAX_SCREENS; i++) {
if(strcasecmp(name, scr_names[i]) == 0)
return i;
}
return 0;
}
/* TODO: skip color codes (start with 0x03 or 0x04).
if we're going to ever support utf-8, decode it here...
also, 0x16 is supposed to be reverse video. not widely used/supported.
eventually, this will be rewritten in asm anyway. */
void scr_putc(char s, char c) {
u8 *dest;
static char bold = 0;
if(s == SCR_CURR)
s = scr_current;
if(c == '\n') {
bold = 0;
if(!xpos)
return;
xpos = 40;
return;
}
if(xpos == 40) {
scr_scroll(s);
xpos = 0;
}
dest = screen_botlines[s] + xpos;
if(c & 0x80) {
/* utf-8 (or maybe latin-1), we don't support it yet */
c = 0xbf; /* inverse ? */
} else if(c == 0x02) {
bold = !bold;
return;
} else if(c == 0x1d) {
/* italics */
c = '/';
} else if(c == 0x1e) {
/* strikethru */
c = '-';
} else if(c == 0x1f) {
/* underline */
c = '_';
} else if(c == 0x0f) {
/* all formatting off */
bold = 0;
return;
} else if(c < 0x20) {
/* unsupported control character */
c += 192;
}
if(bold) c |= 0x80;
*dest = c;
xpos++;
}
void scr_print(char s, const char *text) {
while(*text) {
scr_putc(s, *text);
if(*text == '\n')
break;
text++;
}
scr_activate(s);
}
void scr_print_current(const char *text) {
scr_print(scr_current, text);
}
void scr_print_active(const char *text) {
scr_print(scr_active, text);
}
void scr_activate(char s) {
if(s != scr_current) {
scr_status[s] = SCR_ACTIVE;
scr_show_status(scr_current);
}
scr_active = s;
}
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