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/*
* Copyright (C) 1996-1998 Szeredi Miklos
* Email: mszeredi@inf.bme.hu
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version. See the file COPYING.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include "spscr_p.h"
#include "spscr.h"
#include "spperif.h"
#include "z80.h"
#include <stdlib.h>
#include <stdio.h>
#define TABOFFS 2
volatile int screen_visible = 1;
volatile int accept_keys = 1;
byte *update_screen_line(byte *scrp, int coli, int scri, int border,
qbyte *cmarkp)
{
qbyte *scrptr;
#if LCD_WIDTH == 320 && ( LCD_HEIGHT == 240 || LCD_HEIGHT == 200 )
qbyte brd_color;
#else
(void) border;
#endif
int i;
qbyte *tmptr, *mptr;
qbyte mark, cmark;
cmark = *cmarkp;
scrptr = (qbyte *) scrp;
if(scri >= 0) { /* normal line */
#if LCD_WIDTH == 320 && ( LCD_HEIGHT == 240 || LCD_HEIGHT == 200 )
if(SPNM(border_update)) {
brd_color = SPNM(colors)[border];
brd_color |= brd_color << 8;
brd_color |= brd_color << 16;
for(i = 8; i; i--) *scrptr++ = brd_color;
scrptr += 0x40;
for(i = 8; i; i--) *scrptr++ = brd_color;
scrptr -= 0x48;
}
else
#endif
scrptr += 0x08;
tmptr = SPNM(scr_mark) + 0x2C0 + (coli >> 3);
mark = *tmptr;
if(!(coli & 0x07)) {
cmark = mark;
*tmptr = 0;
}
else cmark |= mark;
mptr = SPNM(scr_mark) + scri;
mark = *mptr | cmark;
if(mark) {
byte *spmp, *spcp;
qbyte *scr_tab;
*mptr = 0;
SPNM(imag_mark)[coli] |= mark;
SPNM(imag_horiz) |= mark;
coli >>= 3;
SPNM(imag_vert) |= (1 << coli);
spmp = PRNM(proc).mem + (scri << 5);
spcp = PRNM(proc).mem + 0x5800 + (coli << 5);
if(!SPNM(flash_state)) scr_tab = SPNM(scr_f0_table);
else scr_tab = SPNM(scr_f1_table);
for(i = 32; i; i--) {
register dbyte spcx, spmx;
spcx = (*spcp++) << 6;
spmx = *spmp++;
*scrptr++ = scr_tab[spcx|((spmx & 0xf0) >> 4)];
*scrptr++ = scr_tab[spcx|((spmx & 0x0f))];
}
scrptr +=0x08;
}
else scrptr += 0x48;
}
else if(scri == -1) { /* only border */
#if LCD_WIDTH == 320 && ( LCD_HEIGHT == 240 || LCD_HEIGHT == 200 )
if(SPNM(border_update)) {
brd_color = SPNM(colors)[border];
brd_color |= brd_color << 8;
brd_color |= brd_color << 16;
for(i = 0x50; i; i--) *scrptr++ = brd_color;
}
else
#endif
scrptr += 0x50;
}
*cmarkp = cmark;
return (byte *) scrptr;
}
void spscr_init_mask_color(void)
{
int clb;
int bwb;
int hb;
int ix, j;
int bc, fc;
byte *tab_f0, *tab_f1;
sp_scr_f0_table = (qbyte *) (PRNM(proc).mem + 0x10000);
sp_scr_f1_table = (qbyte *) (PRNM(proc).mem + 0x20000);
sp_colors[8] = sp_colors[0];
for(clb = 0; clb < 256; clb++)
for(hb = 0; hb < 16; hb++) {
bc = (clb & 0x38) >> 3;
fc = clb & 0x07;
if(clb & 0x40) {
fc |= 0x08;
bc |= 0x08;
}
bwb = hb;
ix = (clb << 8) + (hb << TABOFFS);
tab_f0 = ((byte *) sp_scr_f0_table) + ix + 3;
tab_f1 = ((byte *) sp_scr_f1_table) + ix + 3;
for(j = 4; j; bwb >>= 1, j--) {
*tab_f0-- = (byte) sp_colors[(bwb & 0x01) ? fc : bc];
*tab_f1-- = (byte) sp_colors[(clb & 0x80) ?
((bwb & 0x01) ? bc : fc) :
((bwb & 0x01) ? fc : bc)];
}
}
}
void flash_change(void)
{
int i,j;
byte *scp;
qbyte *mcp;
register unsigned int val;
mcp = sp_scr_mark + 0x2C0;
scp = z80_proc.mem + 0x5800;
for(i = 24; i; mcp++, i--) {
val = 0;
for(j = 32; j; scp++, j--) {
val >>= 1;
if(*scp & 0x80) val |= (1 << 31);
}
*mcp |= val;
}
}
void spscr_init_line_pointers(int lines)
{
int i;
int bs;
int y;
int scline;
bs = (lines - 192) / 2;
for(i = 0; i < PORT_TIME_NUM; i++) {
sp_scri[i] = -2;
if(i < ODDHF) scline = i;
else scline = i - ODDHF;
if(scline >= 64-bs && scline < 256+bs) {
if(scline >= 64 && scline < 256) {
y = scline - 64;
sp_coli[i] = y;
sp_scri[i] = 0x200 +
(y & 0xC0) + ((y & 0x07) << 3) + ((y & 0x38) >> 3);
}
else sp_scri[i] = -1;
}
}
}
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