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Diffstat (limited to 'src/lib/formats/hxcmfm_dsk.cpp')
-rw-r--r--src/lib/formats/hxcmfm_dsk.cpp28
1 files changed, 16 insertions, 12 deletions
diff --git a/src/lib/formats/hxcmfm_dsk.cpp b/src/lib/formats/hxcmfm_dsk.cpp
index b6845b28e4a..e7bf03acd2f 100644
--- a/src/lib/formats/hxcmfm_dsk.cpp
+++ b/src/lib/formats/hxcmfm_dsk.cpp
@@ -1,10 +1,11 @@
// license:BSD-3-Clause
// copyright-holders:Olivier Galibert
-#include <cassert>
-
#include "hxcmfm_dsk.h"
+#include "ioprocs.h"
+
+
#define MFM_FORMAT_HEADER "HXCMFM"
#pragma pack(1)
@@ -57,24 +58,26 @@ bool mfm_format::supports_save() const
return true;
}
-int mfm_format::identify(io_generic *io, uint32_t form_factor, const std::vector<uint32_t> &variants)
+int mfm_format::identify(util::random_read &io, uint32_t form_factor, const std::vector<uint32_t> &variants)
{
uint8_t header[7];
- io_generic_read(io, &header, 0, sizeof(header));
+ size_t actual;
+ io.read_at(0, &header, sizeof(header), actual);
if ( memcmp( header, MFM_FORMAT_HEADER, 6 ) ==0) {
return 100;
}
return 0;
}
-bool mfm_format::load(io_generic *io, uint32_t form_factor, const std::vector<uint32_t> &variants, floppy_image *image)
+bool mfm_format::load(util::random_read &io, uint32_t form_factor, const std::vector<uint32_t> &variants, floppy_image *image)
{
+ size_t actual;
MFMIMG header;
MFMTRACKIMG trackdesc;
// read header
- io_generic_read(io, &header, 0, sizeof(header));
+ io.read_at(0, &header, sizeof(header), actual);
int drivecyl, driveheads;
image->get_maximal_geometry(drivecyl, driveheads);
@@ -86,12 +89,12 @@ bool mfm_format::load(io_generic *io, uint32_t form_factor, const std::vector<ui
for(int side=0; side < header.number_of_side; side++) {
if (!skip_odd || track%2 == 0) {
// read location of
- io_generic_read(io, &trackdesc,(header.mfmtracklistoffset)+( counter *sizeof(trackdesc)),sizeof(trackdesc));
+ io.read_at((header.mfmtracklistoffset)+( counter *sizeof(trackdesc)), &trackdesc, sizeof(trackdesc), actual);
trackbuf.resize(trackdesc.mfmtracksize);
// actual data read
- io_generic_read(io, &trackbuf[0], trackdesc.mfmtrackoffset, trackdesc.mfmtracksize);
+ io.read_at(trackdesc.mfmtrackoffset, &trackbuf[0], trackdesc.mfmtracksize, actual);
if (skip_odd) {
generate_track_from_bitstream(track/2, side, &trackbuf[0], trackdesc.mfmtracksize*8, image);
@@ -109,9 +112,10 @@ bool mfm_format::load(io_generic *io, uint32_t form_factor, const std::vector<ui
return true;
}
-bool mfm_format::save(io_generic *io, const std::vector<uint32_t> &variants, floppy_image *image)
+bool mfm_format::save(util::random_read_write &io, const std::vector<uint32_t> &variants, floppy_image *image)
{
// TODO: HD support
+ size_t actual;
MFMIMG header;
int track_count, head_count;
image->get_actual_geometry(track_count, head_count);
@@ -124,7 +128,7 @@ bool mfm_format::save(io_generic *io, const std::vector<uint32_t> &variants, flo
header.floppyiftype = 4;
header.mfmtracklistoffset = sizeof(MFMIMG);
- io_generic_write(io, &header, 0, sizeof(MFMIMG));
+ io.write_at(0, &header, sizeof(MFMIMG), actual);
int tpos = sizeof(MFMIMG);
int dpos = tpos + track_count*head_count*sizeof(MFMTRACKIMG);
@@ -143,8 +147,8 @@ bool mfm_format::save(io_generic *io, const std::vector<uint32_t> &variants, flo
trackdesc.mfmtracksize = packed.size();
trackdesc.mfmtrackoffset = dpos;
- io_generic_write(io, &trackdesc, tpos, sizeof(MFMTRACKIMG));
- io_generic_write(io, packed.data(), dpos, packed.size());
+ io.write_at(tpos, &trackdesc, sizeof(MFMTRACKIMG), actual);
+ io.write_at(dpos, packed.data(), packed.size(), actual);
tpos += sizeof(MFMTRACKIMG);
dpos += packed.size();
1'>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
/***************************************************************************

    Jaleco Exerion

***************************************************************************/

#include "driver.h"
#include "video/resnet.h"
#include "exerion.h"


#define BACKGROUND_X_START		32

#define VISIBLE_X_MIN			(12*8)
#define VISIBLE_X_MAX			(52*8)
#define VISIBLE_Y_MIN			(2*8)
#define VISIBLE_Y_MAX			(30*8)


UINT8 exerion_cocktail_flip;

static UINT8 char_palette, sprite_palette;
static UINT8 char_bank;

static UINT16 *background_gfx[4];
static UINT8 background_latches[13];

static UINT8 *background_mixer;


/***************************************************************************

  Convert the color PROMs into a more useable format.

  The palette PROM is connected to the RGB output this way:

  bit 7 -- 220 ohm resistor  -- BLUE
        -- 470 ohm resistor  -- BLUE
        -- 220 ohm resistor  -- GREEN
        -- 470 ohm resistor  -- GREEN
        -- 1  kohm resistor  -- GREEN
        -- 220 ohm resistor  -- RED
        -- 470 ohm resistor  -- RED
  bit 0 -- 1  kohm resistor  -- RED

***************************************************************************/

PALETTE_INIT( exerion )
{
	static const int resistances_rg[3] = { 1000, 470, 220 };
	static const int resistances_b [2] = { 470, 220 };
	double rweights[3], gweights[3], bweights[2];
	int i;

	/* compute the color output resistor weights */
	compute_resistor_weights(0,	255, -1.0,
			3, &resistances_rg[0], rweights, 0, 0,
			3, &resistances_rg[0], gweights, 0, 0,
			2, &resistances_b[0],  bweights, 0, 0);

	/* allocate the colortable */
	machine->colortable = colortable_alloc(machine, 0x20);

	/* create a lookup table for the palette */
	for (i = 0; i < 0x20; i++)
	{
		int bit0, bit1, bit2;
		int r, g, b;

		/* red component */
		bit0 = (color_prom[i] >> 0) & 0x01;
		bit1 = (color_prom[i] >> 1) & 0x01;
		bit2 = (color_prom[i] >> 2) & 0x01;
		r = combine_3_weights(rweights, bit0, bit1, bit2);

		/* green component */
		bit0 = (color_prom[i] >> 3) & 0x01;
		bit1 = (color_prom[i] >> 4) & 0x01;
		bit2 = (color_prom[i] >> 5) & 0x01;
		g = combine_3_weights(gweights, bit0, bit1, bit2);

		/* blue component */
		bit0 = (color_prom[i] >> 6) & 0x01;
		bit1 = (color_prom[i] >> 7) & 0x01;
		b = combine_2_weights(bweights, bit0, bit1);

		colortable_palette_set_color(machine->colortable, i, MAKE_RGB(r, g, b));
	}

	/* color_prom now points to the beginning of the lookup table */
	color_prom += 0x20;

	/* fg chars and sprites */
	for (i = 0; i < 0x200; i++)
	{
		UINT8 ctabentry = 0x10 | (color_prom[(i & 0x1c0) | ((i & 3) << 4) | ((i >> 2) & 0x0f)] & 0x0f);
		colortable_entry_set_value(machine->colortable, i, ctabentry);
	}

	/* bg chars (this is not the full story... there are four layers mixed */
	/* using another PROM */
	for (i = 0x200; i < 0x300; i++)
	{
		UINT8 ctabentry = color_prom[i] & 0x0f;
		colortable_entry_set_value(machine->colortable, i, ctabentry);
	}
 }



/*************************************
 *
 *  Video system startup
 *
 *************************************/

VIDEO_START( exerion )
{
	int i;
	UINT8 *gfx;

	/* get pointers to the mixing and lookup PROMs */
	background_mixer = memory_region(machine, "proms") + 0x320;

	/* allocate memory for the decoded background graphics */
	background_gfx[0] = auto_malloc(2 * 256 * 256 * 4);
	background_gfx[1] = background_gfx[0] + 256 * 256;
	background_gfx[2] = background_gfx[1] + 256 * 256;
	background_gfx[3] = background_gfx[2] + 256 * 256;

	/*---------------------------------
     * Decode the background graphics
     *
     * We decode the 4 background layers separately, but shuffle the bits so that
     * we can OR all four layers together. Each layer has 2 bits per pixel. Each
     * layer is decoded into the following bit patterns:
     *
     *  000a 0000 00AA
     *  00b0 0000 BB00
     *  0c00 00CC 0000
     *  d000 DD00 0000
     *
     * Where AA,BB,CC,DD are the 2bpp data for the pixel,and a,b,c,d are the OR
     * of these two bits together.
     */
	gfx = memory_region(machine, "gfx3");
	for (i = 0; i < 4; i++)
	{
		int y;

		UINT8 *src = gfx + i * 0x2000;
		UINT16 *dst = background_gfx[i];

		for (y = 0; y < 0x100; y++)
		{
			int x;

			for (x = 0; x < 0x80; x += 4)
			{
				UINT8 data = *src++;
				UINT16 val;

				val = ((data >> 3) & 2) | ((data >> 0) & 1);
				if (val) val |= 0x100 >> i;
				*dst++ = val << (2 * i);

				val = ((data >> 4) & 2) | ((data >> 1) & 1);
				if (val) val |= 0x100 >> i;
				*dst++ = val << (2 * i);

				val = ((data >> 5) & 2) | ((data >> 2) & 1);
				if (val) val |= 0x100 >> i;
				*dst++ = val << (2 * i);

				val = ((data >> 6) & 2) | ((data >> 3) & 1);
				if (val) val |= 0x100 >> i;
				*dst++ = val << (2 * i);
			}

			for (; x < 0x100; x++)
				*dst++ = 0;
		}
	}
}



/*************************************
 *
 *  Video register I/O
 *
 *************************************/

WRITE8_HANDLER( exerion_videoreg_w )
{
	/* bit 0 = flip screen and joystick input multiplexer */
	exerion_cocktail_flip = data & 1;

	/* bits 1-2 char lookup table bank */
	char_palette = (data & 0x06) >> 1;

	/* bits 3 char bank */
	char_bank = (data & 0x08) >> 3;

	/* bits 4-5 unused */

	/* bits 6-7 sprite lookup table bank */
	sprite_palette = (data & 0xc0) >> 6;
}


WRITE8_HANDLER( exerion_video_latch_w )
{
	int scanline = video_screen_get_vpos(space->machine->primary_screen);
	if (scanline > 0)
		video_screen_update_partial(space->machine->primary_screen, scanline - 1);
	background_latches[offset] = data;
}


READ8_HANDLER( exerion_video_timing_r )
{
	/* bit 0 is the SNMI signal, which is the negated value of H6, if H7=1 & H8=1 & VBLANK=0, otherwise 1 */
	/* bit 1 is VBLANK */

	UINT16 hcounter = video_screen_get_hpos(space->machine->primary_screen) + EXERION_HCOUNT_START;
	UINT8 snmi = 1;

	if (((hcounter & 0x180) == 0x180) && !video_screen_get_vblank(space->machine->primary_screen))
		snmi = !((hcounter >> 6) & 0x01);

	return (video_screen_get_vblank(space->machine->primary_screen) << 1) | snmi;
}


/*************************************
 *
 *  Background rendering
 *
 *************************************/

static void draw_background(bitmap_t *bitmap, const rectangle *cliprect)
{
	int x, y;

	/* loop over all visible scanlines */
	for (y = cliprect->min_y; y <= cliprect->max_y; y++)
	{
		UINT16 *src0 = &background_gfx[0][background_latches[1] * 256];
		UINT16 *src1 = &background_gfx[1][background_latches[3] * 256];
		UINT16 *src2 = &background_gfx[2][background_latches[5] * 256];
		UINT16 *src3 = &background_gfx[3][background_latches[7] * 256];
		int xoffs0 = background_latches[0];
		int xoffs1 = background_latches[2];
		int xoffs2 = background_latches[4];
		int xoffs3 = background_latches[6];
		int start0 = background_latches[8] & 0x0f;
		int start1 = background_latches[9] & 0x0f;
		int start2 = background_latches[10] & 0x0f;
		int start3 = background_latches[11] & 0x0f;
		int stop0 = background_latches[8] >> 4;
		int stop1 = background_latches[9] >> 4;
		int stop2 = background_latches[10] >> 4;
		int stop3 = background_latches[11] >> 4;
		UINT8 *mixer = &background_mixer[(background_latches[12] << 4) & 0xf0];
		UINT16 scanline[VISIBLE_X_MAX];
		pen_t pen_base = 0x200 + ((background_latches[12] >> 4) << 4);

		/* the cocktail flip flag controls whether we count up or down in X */
		if (!exerion_cocktail_flip)
		{
			/* skip processing anything that's not visible */
			for (x = BACKGROUND_X_START; x < cliprect->min_x; x++)
			{
				if (!(++xoffs0 & 0x1f)) start0++, stop0++;
				if (!(++xoffs1 & 0x1f)) start1++, stop1++;
				if (!(++xoffs2 & 0x1f)) start2++, stop2++;
				if (!(++xoffs3 & 0x1f)) start3++, stop3++;
			}

			/* draw the rest of the scanline fully */
			for (x = cliprect->min_x; x <= cliprect->max_x; x++)
			{
				UINT16 combined = 0;
				UINT8 lookupval;

				/* the output enable is controlled by the carries on the start/stop counters */
				/* they are only active when the start has carried but the stop hasn't */
				if ((start0 ^ stop0) & 0x10) combined |= src0[xoffs0 & 0xff];
				if ((start1 ^ stop1) & 0x10) combined |= src1[xoffs1 & 0xff];
				if ((start2 ^ stop2) & 0x10) combined |= src2[xoffs2 & 0xff];
				if ((start3 ^ stop3) & 0x10) combined |= src3[xoffs3 & 0xff];

				/* bits 8-11 of the combined value contains the lookup for the mixer PROM */
				lookupval = mixer[combined >> 8] & 3;

				/* the color index comes from the looked up value combined with the pixel data */
				scanline[x] = pen_base | (lookupval << 2) | ((combined >> (2 * lookupval)) & 3);

				/* the start/stop counters are clocked when the low 5 bits of the X counter overflow */
				if (!(++xoffs0 & 0x1f)) start0++, stop0++;
				if (!(++xoffs1 & 0x1f)) start1++, stop1++;
				if (!(++xoffs2 & 0x1f)) start2++, stop2++;
				if (!(++xoffs3 & 0x1f)) start3++, stop3++;
			}
		}
		else
		{
			/* skip processing anything that's not visible */
			for (x = BACKGROUND_X_START; x < cliprect->min_x; x++)
			{
				if (!(xoffs0-- & 0x1f)) start0++, stop0++;
				if (!(xoffs1-- & 0x1f)) start1++, stop1++;
				if (!(xoffs2-- & 0x1f)) start2++, stop2++;
				if (!(xoffs3-- & 0x1f)) start3++, stop3++;
			}

			/* draw the rest of the scanline fully */
			for (x = cliprect->min_x; x <= cliprect->max_x; x++)
			{
				UINT16 combined = 0;
				UINT8 lookupval;

				/* the output enable is controlled by the carries on the start/stop counters */
				/* they are only active when the start has carried but the stop hasn't */
				if ((start0 ^ stop0) & 0x10) combined |= src0[xoffs0 & 0xff];
				if ((start1 ^ stop1) & 0x10) combined |= src1[xoffs1 & 0xff];
				if ((start2 ^ stop2) & 0x10) combined |= src2[xoffs2 & 0xff];
				if ((start3 ^ stop3) & 0x10) combined |= src3[xoffs3 & 0xff];

				/* bits 8-11 of the combined value contains the lookup for the mixer PROM */
				lookupval = mixer[combined >> 8] & 3;

				/* the color index comes from the looked up value combined with the pixel data */
				scanline[x] = pen_base | (lookupval << 2) | ((combined >> (2 * lookupval)) & 3);

				/* the start/stop counters are clocked when the low 5 bits of the X counter overflow */
				if (!(xoffs0-- & 0x1f)) start0++, stop0++;
				if (!(xoffs1-- & 0x1f)) start1++, stop1++;
				if (!(xoffs2-- & 0x1f)) start2++, stop2++;
				if (!(xoffs3-- & 0x1f)) start3++, stop3++;
			}
		}

		/* draw the scanline */
		draw_scanline16(bitmap, cliprect->min_x, y, cliprect->max_x - cliprect->min_x + 1, &scanline[cliprect->min_x], NULL);
	}
}


/*************************************
 *
 *  Core refresh routine
 *
 *************************************/

VIDEO_UPDATE( exerion )
{
	int sx, sy, offs, i;

	/* draw background */
	draw_background(bitmap, cliprect);

	/* draw sprites */
	for (i = 0; i < spriteram_size; i += 4)
	{
		int flags = spriteram[i + 0];
		int y = spriteram[i + 1] ^ 255;
		int code = spriteram[i + 2];
		int x = spriteram[i + 3] * 2 + 72;

		int xflip = flags & 0x80;
		int yflip = flags & 0x40;
		int doubled = flags & 0x10;
		int wide = flags & 0x08;
		int code2 = code;

		int color = ((flags >> 1) & 0x03) | ((code >> 5) & 0x04) | (code & 0x08) | (sprite_palette * 16);
		const gfx_element *gfx = doubled ? screen->machine->gfx[2] : screen->machine->gfx[1];

		if (exerion_cocktail_flip)
		{
			x = 64*8 - gfx->width - x;
			y = 32*8 - gfx->height - y;
			if (wide) y -= gfx->height;
			xflip = !xflip;
			yflip = !yflip;
		}

		if (wide)
		{
			if (yflip)
				code |= 0x10, code2 &= ~0x10;
			else
				code &= ~0x10, code2 |= 0x10;

			drawgfx(bitmap, gfx, code2, color, xflip, yflip, x, y + gfx->height,
			        cliprect, TRANSPARENCY_PENS,
			        colortable_get_transpen_mask(screen->machine->colortable, gfx, color, 0x10));
		}

		drawgfx(bitmap, gfx, code, color, xflip, yflip, x, y,
			    cliprect, TRANSPARENCY_PENS,
			    colortable_get_transpen_mask(screen->machine->colortable, gfx, color, 0x10));

		if (doubled) i += 4;
	}

	/* draw the visible text layer */
	for (sy = cliprect->min_y/8; sy <= cliprect->max_y/8; sy++)
		for (sx = VISIBLE_X_MIN/8; sx < VISIBLE_X_MAX/8; sx++)
		{
			int x = exerion_cocktail_flip ? (63*8 - 8*sx) : 8*sx;
			int y = exerion_cocktail_flip ? (31*8 - 8*sy) : 8*sy;

			offs = sx + sy * 64;
			drawgfx(bitmap, screen->machine->gfx[0],
				videoram[offs] + 256 * char_bank,
				((videoram[offs] & 0xf0) >> 4) + char_palette * 16,
				exerion_cocktail_flip, exerion_cocktail_flip, x, y,
				cliprect, TRANSPARENCY_PEN, 0);
		}

	return 0;
}