summaryrefslogtreecommitdiffstatshomepage
path: root/scripts/src/machine.lua
diff options
context:
space:
mode:
author Lord-Nightmare <Lord-Nightmare@users.noreply.github.com>2016-01-15 02:42:14 -0500
committer Lord-Nightmare <Lord-Nightmare@users.noreply.github.com>2016-01-15 02:42:14 -0500
commit5c0b55f15bc30945343cba560400157deea80c56 (patch)
treee97f17c6bae3573182a16b26452ca0fba194be60 /scripts/src/machine.lua
parenteef39d9b7b9e681f18c469d1a6216089e9c9b289 (diff)
disable some logging accidentally left enabled (nw)
Diffstat (limited to 'scripts/src/machine.lua')
0 files changed, 0 insertions, 0 deletions
#n102'>102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516
// license:BSD-3-Clause
// copyright-holders:Phill Harvey-Smith, Carl
/*
    video/rmnimbus.c

    Research machines Nimbus.

    2009-11-14, P.Harvey-Smith.

    This is my best guess implementation of the operation of the Nimbus
    video system.

    On the real machine, the Video chip has a block of 64K of memory which is
    completely separate from the main 80186 memory.

    The main CPU write to the video chip via a series of registers in the
    0x0000 to 0x002F reigon, the video chip then manages all video memory
    from there.

    As I cannot find a datasheet for the vide chip marked
    MB61H201 Fujitsu RML 12835 GCV, I have had to determine most of its
    operation by disassembling the Nimbus bios and by writing experemental
    code on the real machine.
*/

#include <functional>

#include "emu.h"
#include "debugger.h"
#include "debug/debugcpu.h"
#include "debug/debugcon.h"
#include "includes/rmnimbus.h"


#define WIDTH_MASK      0x07

#define FG_COLOUR       (m_colours&0x0F)
#define BG_COLOUR       ((m_colours&0xF0)>>4)
#define SELECT_COL(x,c) (IS_80COL ? ((((x) & 1) ? ((c) << 2) : (c)) & 0xC) : (c))
#define FILL_WORD(c)    (((c) << 12) | ((c) << 8) | ((c) << 4) | (c))

#define IS_80COL        (m_mode&0x10)
#define IS_XOR          (m_op&8)

#define DEBUG_TEXT  0x01
#define DEBUG_DB    0x02
#define DEBUG_PIXEL 0x04

#define DEBUG_SET(flags)    ((m_debug_video & (flags))==(flags))

READ16_MEMBER(rmnimbus_state::nimbus_video_io_r)
{
	UINT16 result = 0;

	switch (offset)
	{
		case 0x00:
		case 0x08:
			result = read_pixel_data(m_x, m_y);
			break;
		case 0x02:
		case 0x0A:
			result = read_pixel_data(m_x, ++m_y);
			break;
		case 0x05:
		case 0x0D:
			result = read_pixel_data(++m_x, m_y);
			break;

		case 0x10:
			result = m_yline;
			break;
		case 0x11:
			result = m_op;
			break;
		case 0x12:
			result = m_colours;
			break;
		case 0x13:
			result = m_mode;
			break;
		case 0x14:
			result = m_screen->vpos() % 0xb; // TODO: verify
			break;
		case 0x15:
			result = m_x;
			break;
		case 0x16:
			result = m_y;
			break;
		default:
			logerror("nimbus: unknown video reg read %02x\n", offset);
			break;
	}

	if(DEBUG_SET(DEBUG_TEXT))
		logerror("Nimbus video IOR at %05X from %04X mask=%04X, data=%04X\n",space.device().safe_pc(),(offset*2),mem_mask,result);

	return result;
}

UINT8 rmnimbus_state::get_pixel(UINT16 x, UINT16 y)
{
	UINT8   result = 0;

	if((x<640) && (y<250))
	{
		if(IS_80COL)
			result=m_video_mem.pix16(y, x) >> 2;
		else
			result=m_video_mem.pix16(y, x*2);
	}

	return result;
}

UINT16 rmnimbus_state::read_pixel_line(UINT16 x, UINT16 y, UINT8 pixels, UINT8 bpp)
{
	UINT16 colour = 0;
	int i;
	x *= pixels;

	if(DEBUG_SET(DEBUG_TEXT | DEBUG_PIXEL))
		logerror("read_pixel_line(x=%d, y=%d, width=%d, bpp=%d)\n",x,y,pixels,bpp);

	for(i = 0; i < pixels - 1; i++)
	{
		colour |= get_pixel(i + x, y);

		if(bpp==1)
			colour=((colour==SELECT_COL(x + i, FG_COLOUR)) ? 1 : 0) << 1;
		else
			colour <<= bpp;
	}
	return colour | get_pixel(x + i, y);
}

UINT16 rmnimbus_state::read_pixel_data(UINT16 x, UINT16 y)
{
	UINT16  result=0;

	if(DEBUG_SET(DEBUG_TEXT | DEBUG_PIXEL))
		logerror("read_pixel_data(x=%d, y=%d), reg022=%04X\n",x,y,m_op);

	if(IS_80COL)
	{
		switch (m_op & WIDTH_MASK)
		{
			case 0x00   : break;

			case 0x01   : break;

			case 0x02   : break;

			case 0x03   : break;

			case 0x04   :
					result=read_pixel_line(x,y,4,2);
					break;

			case 0x05   : break;

			case 0x06   :
					result=read_pixel_line(x,y,8,2);
					break;

			case 0x07   : break;
		}
	}
	else /* 40 Col */
	{
		switch (m_op & WIDTH_MASK)
		{
			case 0x00   : break;

			case 0x01   : break;

			case 0x02   : break;

			case 0x03   : break;

			case 0x04   : break;

			case 0x05   : break;

			case 0x06   :
					result=read_pixel_line(x,y,4,4);
					break;

			case 0x07   : break;
		}
	}

	return result;
}

/*
    Write to the video registers.

    Incase anyone wonders about the DEBUG_DB statement, this allows me to log which registers
    are being written to and then play them back at the real machine, this has helped greatly
    in figuring out what the video registers do.

*/

WRITE16_MEMBER(rmnimbus_state::nimbus_video_io_w)
{
	UINT16 colours = data;
	if(offset < 0x14)
	{
		if(DEBUG_SET(DEBUG_TEXT))
			logerror("Nimbus video IOW at %05X write of %04X to %04X mask=%04X\n",space.device().safe_pc(),data,(offset*2),mem_mask);

		if(DEBUG_SET(DEBUG_DB))
			logerror("dw %05X,%05X\n",(offset*2),data);
	}

	switch (offset)
	{
		case 0x00:
		case 0x08:
			break;

		case 0x09:
			colours = FILL_WORD(FG_COLOUR);
		case 0x01:
			m_x = data;
			break;

		case 0x02:
		case 0x0A:
			m_y++;
			break;

		case 0x0B:
			colours = FILL_WORD(FG_COLOUR);
		case 0x03:
			m_x = data;
			m_y++;
			break;

		case 0x05:
		case 0x0D:
			m_x++;
			break;

		case 0x0E:
			colours = FILL_WORD(FG_COLOUR);
		case 0x06:
			m_y = data;
			break;

		case 0x0F:
			colours = FILL_WORD(FG_COLOUR);
		case 0x07:
			m_y = data;
			m_x++;
			break;

		case 0x10:
			m_yline = data;
			return;
		case 0x11:
			m_op = data;
			return;
		case 0x12:
			m_colours = data;
			return;
		case 0x13:
			/*
			    bits 0..3 of reg026 contain the border colour.
			    bit 5 contains the 40/80 column (320/640 pixel) flag.
			*/
			m_mode = data;
			return;
		case 0x14:
		case 0x15:
		case 0x16:
		case 0x17:
			change_palette(offset - 0x14, data);
			return;

		default:
			logerror("nimbus: unknown video reg write %02x %04x\n", offset, data);
			return;
	}
	if(offset & 0x08)
		write_pixel_data(m_x, m_y, colours);
}

void rmnimbus_state::set_pixel(UINT16 x, UINT16 y, UINT8 colour)
{
	if(DEBUG_SET(DEBUG_TEXT | DEBUG_PIXEL))
		logerror("set_pixel(x=%d, y=%d, colour=%04X), IS_XOR=%02X\n",x,y,colour,IS_XOR);

	if((x<640) && (y<250))
	{
		if(IS_XOR)
			m_video_mem.pix16(y, x)^=colour;
		else
			m_video_mem.pix16(y, x)=colour;
	}
}

void rmnimbus_state::set_pixel40( UINT16 x, UINT16 y, UINT8 colour)
{
	set_pixel((x*2),y,colour);
	set_pixel((x*2)+1,y,colour);
}

void rmnimbus_state::write_pixel_line(UINT16 x, UINT16 y, UINT16 data, UINT8 pixels, UINT8 bpp)
{
	UINT8 colour;
	UINT8 mask = (1 << bpp) - 1;
	x *= pixels;

	if(DEBUG_SET(DEBUG_TEXT | DEBUG_PIXEL))
		logerror("write_pixel_line(x=%d, y=%d, data=%04X, width=%d, bpp=%d)\n",x,y,data,pixels,bpp);

	for(int i = (pixels - 1); i >= 0; i--)
	{
		if(bpp==1)
			colour = SELECT_COL(x + i, (data & 1) ? FG_COLOUR : BG_COLOUR);
		else if(IS_80COL)
			colour = (data & mask) << 2;
		else
			colour = (data & mask);

		if(IS_80COL)
			set_pixel(x + i,y,colour);
		else
			set_pixel40(x + i,y,colour);

		data >>= bpp;
	}
}

void rmnimbus_state::move_pixel_line(UINT16 x, UINT16 y, UINT8 pixels)
{
	x *= pixels;
	if(DEBUG_SET(DEBUG_TEXT | DEBUG_PIXEL))
		logerror("move_pixel_line(x=%d, y=%d, width=%d)\n",x,y,pixels);

	for(int i = 0; i < pixels; i++)
	{
		if(DEBUG_SET(DEBUG_TEXT | DEBUG_PIXEL))
			logerror("x=%d\n",x + i);
		m_video_mem.pix16(m_yline, x + i) = m_video_mem.pix16(y, x + i);
	}
}



/*
    The values in the bottom 3 bits of reg022 seem to determine the number of bits per pixel
    for following operations.

    The values that I have decoded so far are :

    000 1bpp, foreground and background colours taken from reg024
    001 2bpp, using the first 4 colours of the pallette
    010
    011
    100 4bpp, must be a 16 bit word, of which the upper byte is a mask anded with existing pixels then ored
              with the lower byte containing the pixel data for two pixels.
    101 Move pixel data at x,reg020 to x,y, used for scrolling.
    110 if 40 col
            4bpp, 16 bit word containing the pixel data for 4 pixels.
        else
            2bpp, 16 bit word containing the pixel data for 8 pixels.
    111

    Bit 3 of reg022 is as follows :

    0   pixels are written from supplied colour data
    1   pixels are xor'ed onto the screen
*/

void rmnimbus_state::write_pixel_data(UINT16 x, UINT16 y, UINT16    data)
{
	if(DEBUG_SET(DEBUG_TEXT | DEBUG_PIXEL))
		logerror("write_pixel_data(x=%d, y=%d, data=%04X), reg022=%04X\n",x,y,data,m_op);

	if(IS_80COL)
	{
		switch (m_op & WIDTH_MASK)
		{
			case 0x00:
				write_pixel_line(x,y,data,16,1);
				break;

			case 0x01:
				write_pixel_line(x,y,data,8,1);
				break;

			case 0x02:
				write_pixel_line(x,y,data,8,1);
				break;

			case 0x03:
				set_pixel(x,y,SELECT_COL(x, FG_COLOUR));
				break;

			case 0x04:
				write_pixel_line(x,y,(((data & 0xFF00)>>8) & (data & 0xFF)) | (~((data & 0xFF00)>>8) & read_pixel_line(x,y,4,2)),4,2);
				break;

			case 0x05:
				move_pixel_line(x,y,16);
				break;

			case 0x06:
				write_pixel_line(x,y,data,8,2);
				break;

			case 0x07:
				set_pixel(x,y,SELECT_COL(x, FG_COLOUR));
				break;
		}
	}
	else /* 40 Col */
	{
		switch (m_op & WIDTH_MASK)
		{
			case 0x00:
				write_pixel_line(x,y,data,8,1);
				break;

			case 0x01:
				write_pixel_line(x,y,data,4,2);
				break;

			case 0x02:
				set_pixel40(x,y,FG_COLOUR);
				break;

			case 0x03:
				set_pixel(x,y,FG_COLOUR);
				break;

			case 0x04:
				write_pixel_line(x,y,(((data & 0xFF00)>>8) & (data & 0xFF)) | (~((data & 0xFF00)>>8) & read_pixel_line(x,y,2,4)),2,4);
				break;

			case 0x05:
				move_pixel_line(x,y,16);
				break;

			case 0x06:
				write_pixel_line(x,y,data,4,4);
				break;

			case 0x07:
				set_pixel(x,y,FG_COLOUR);
				break;
		}
	}
}

void rmnimbus_state::change_palette(UINT8 bank, UINT16 colours)
{
	// loop over changing colours
	for(int colourno = (bank * 4); colourno < ((bank + 1) * 4); colourno++)
	{
		int i = (colours & 8) >> 3;
		m_palette->set_pen_color(colourno, pal2bit((colours & 2) | i), pal2bit(((colours & 4) >> 1) | i), pal2bit(((colours & 1) << 1) | i));

		if(DEBUG_SET(DEBUG_TEXT))
			logerror("set colourno[%02X], colour=%02X\n",colourno, colours & 0xf);
		colours >>= 4;
	}
}

void rmnimbus_state::video_debug(int ref, int params, const char *param[])
{
	if (params > 0)
	{
		int temp;
		sscanf(param[0],"%d",&temp);
		m_debug_video = temp;
	}
	else
	{
		machine().debugger().console().printf("Error usage : nimbus_vid_debug <debuglevel>\n");
		machine().debugger().console().printf("Current debuglevel=%02X\n", m_debug_video);
	}
}

void rmnimbus_state::video_start()
{
	m_debug_video = 0;

	m_screen->register_screen_bitmap(m_video_mem);

	if (machine().debug_flags & DEBUG_FLAG_ENABLED)
	{
		using namespace std::placeholders;
		machine().debugger().console().register_command("nimbus_vid_debug", CMDFLAG_NONE, 0, 0, 1, std::bind(&rmnimbus_state::video_debug, this, _1, _2, _3));
	}
}

void rmnimbus_state::video_reset()
{
	m_mode = 0;
	m_x = 0;
	m_y = 0;
	m_op = 0;
	m_yline = 0;
}

UINT32 rmnimbus_state::screen_update_nimbus(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	copybitmap(bitmap, m_video_mem, 0, 0, 0, 0, cliprect);

	return 0;
}