summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/video/k053250_ps.cpp
blob: ead047ec3802e0cb041141c7909f381f7bad39bc (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
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
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
// license:BSD-3-Clause
// copyright-holders:Olivier Galibert
#include "emu.h"
#include "k053250_ps.h"
#include "screen.h"

/*

  Registers
  
  0
    xxxx xxxx  X-Scroll [7:0]

  1
    xxxx xxxx  X-Scroll [15:8]
 
  2
    xxxx xxxx  Y-Scroll [7:0]
 
  3
    xxxx xxxx  Y-Scroll [15:8]
 
  4              Control
    .... ...x    0:Swap XY 1:Normal
    .... ..x.    Interrupt related?
    .... .x..    0:Disable 1:Enable source clipping
    .... x...    Flip X
    ...x ....    Flip Y
    xxx. ....    Wrap control
 
  5
    .... ....    Unknown
  
  6
    xxxx xxxx    ROM access address [7:0]
 
  7
    xxxx xxxx    ROM access address [15:8]
 */

const device_type K053250PS = device_creator<k053250ps_device>;

k053250ps_device::k053250ps_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
	: device_t(mconfig, K053250PS, "K053250PS LVC", tag, owner, clock, "k053250ps", __FILE__),
		device_gfx_interface(mconfig, *this),
		device_video_interface(mconfig, *this),
		m_dmairq_cb(*this),
		m_rom(*this, DEVICE_SELF)
{
}

void k053250ps_device::static_set_offsets(device_t &device, int offx, int offy)
{
	k053250ps_device &dev = downcast<k053250ps_device &>(device);
	dev.m_offx = offx;
	dev.m_offy = offy;
}

void k053250ps_device::unpack_nibbles()
{
	m_unpacked_rom.resize(m_rom.length()*2);

	for (int i = 0; i < m_rom.length(); i++)
	{
		m_unpacked_rom[2*i] = m_rom[i] >> 4;
		m_unpacked_rom[2*i+1] = m_rom[i] & 0xf;
	}
}

void k053250ps_device::device_start()
{
	m_ram.resize(0x6000/2);
	m_buffer[0] = &m_ram[0x0000];
	m_buffer[1] = &m_ram[0x0800];
	
//	m_buffer[0] = &m_ram[0x2000];
//	m_buffer[1] = &m_ram[0x2800];

	unpack_nibbles();

	save_item(NAME(m_ram));
	save_item(NAME(m_regs));
	save_item(NAME(m_page));
	save_item(NAME(m_dmairq_on));
	
	m_dmairq_cb.resolve_safe();
	m_timer_lvcdma = timer_alloc(0);
}

void k053250ps_device::device_reset()
{
	m_page = 0;
	memset(m_regs, 0, sizeof(m_regs));
	
	m_timer_lvcdma_state = OD_IDLE;
	m_timer_lvcdma->adjust(attotime::never);
	
	m_dmairq_on = false;
}

// utility function to render a clipped scanline vertically or horizontally
inline void k053250ps_device::pdraw_scanline32(bitmap_rgb32 &bitmap, const pen_t *pal_base, uint8_t *source,
										const rectangle &cliprect, int linepos, int scroll, int zoom,
										uint32_t clipmask, uint32_t wrapmask, uint32_t orientation, bitmap_ind8 &priority, uint8_t pri)
{
// a sixteen-bit fixed point resolution should be adequate to our application
#define FIXPOINT_PRECISION      16
#define FIXPOINT_PRECISION_HALF (1<<(FIXPOINT_PRECISION-1))

	int end_pixel, flip, dst_min, dst_max, dst_start, dst_length;

	uint32_t src_wrapmask;
	uint8_t  *src_base;
	int src_fx, src_fdx;
	int pix_data, dst_offset;
	uint8_t  *pri_base;
	uint32_t *dst_base;
	int dst_adv;

	// flip X and flip Y also switch role when the X Y coordinates are swapped
	if (!(orientation & ORIENTATION_SWAP_XY))
	{
		flip = orientation & ORIENTATION_FLIP_X;
		dst_min = cliprect.min_x;
		dst_max = cliprect.max_x;
	}
	else
	{
		flip = orientation & ORIENTATION_FLIP_Y;
		dst_min = cliprect.min_y;
		dst_max = cliprect.max_y;
	}

	if (clipmask)
	{
		// reject scanlines that are outside of the target bitmap's right(bottom) clip boundary
		dst_start = -scroll;
		if (dst_start > dst_max) return;

		// calculate target length
		dst_length = clipmask + 1;
		if (zoom) dst_length = (dst_length << 6) / zoom;

		// reject scanlines that are outside of the target bitmap's left(top) clip boundary
		end_pixel = dst_start + dst_length - 1;
		if (end_pixel < dst_min) return;

		// clip scanline tail
		if ((end_pixel -= dst_max) > 0) dst_length -= end_pixel;

		// reject 0-length scanlines
		if (dst_length <= 0) return;

		// calculate zoom factor
		src_fdx = zoom << (FIXPOINT_PRECISION-6);

		// clip scanline head
		end_pixel = dst_min;
		if ((end_pixel -= dst_start) > 0)
		{
			// chop scanline to the correct length and move target start location to the left(top) clip boundary
			dst_length -= end_pixel;
			dst_start = dst_min;

			// and skip the source for the left(top) clip region
			src_fx = end_pixel * src_fdx + FIXPOINT_PRECISION_HALF;
		}
		else
			// the point five bias is to ensure even distribution of stretched or shrinked pixels
			src_fx = FIXPOINT_PRECISION_HALF;

		// adjust flipped source
		if (flip)
		{
			// start from the target's clipped end if the scanline is flipped
			dst_start = dst_max + dst_min - dst_start - (dst_length-1);

			// and move source start location to the opposite end
			src_fx += (dst_length-1) * src_fdx - 1;
			src_fdx = -src_fdx;
		}
	}
	else
	{
		// draw wrapped scanline at virtual bitmap boundary when source clipping is off
		dst_start = dst_min;
		dst_length = dst_max - dst_min + 1; // target scanline spans the entire visible area
		src_fdx = zoom << (FIXPOINT_PRECISION-6);

		// pre-advance source for the clipped region
		if (!flip)
			src_fx = (scroll + dst_min) * src_fdx + FIXPOINT_PRECISION_HALF;
		else
		{
			src_fx = (scroll + dst_max) * src_fdx + FIXPOINT_PRECISION_HALF-1;
			src_fdx = -src_fdx;
		}
	}

	if (!(orientation & ORIENTATION_SWAP_XY))
	{
		// calculate target increment for horizontal scanlines which is exactly one
		dst_adv = 1;
		dst_offset = dst_length;
		pri_base = &priority.pix8(linepos, dst_start + dst_offset);
		dst_base = &bitmap.pix32(linepos, dst_start + dst_length);
	}
	else
	{
		// calculate target increment for vertical scanlines which is the bitmap's pitch value
		dst_adv = bitmap.rowpixels();
		dst_offset= dst_length * dst_adv;
		pri_base = &priority.pix8(dst_start, linepos + dst_offset);
		dst_base = &bitmap.pix32(dst_start, linepos + dst_offset);
	}

	// generalized
	src_base = source;

	// there is no need to wrap source offsets along with source clipping
	// so we set all bits of the wrapmask to one
	src_wrapmask = (clipmask) ? ~0 : wrapmask;

	dst_offset = -dst_offset; // negate target offset in order to terminated draw loop at 0 condition

	if (pri)
	{
		// draw scanline and update priority bitmap
		do
		{
			pix_data = src_base[(src_fx>>FIXPOINT_PRECISION) & src_wrapmask];
			src_fx += src_fdx;

			if (pix_data)
			{
				pix_data = pal_base[pix_data];
				pri_base[dst_offset] = pri;
				dst_base[dst_offset] = pix_data;
			}
		}
		while (dst_offset += dst_adv);
	}
	else
	{
		// draw scanline but do not update priority bitmap
		do
		{
			pix_data = src_base[(src_fx>>FIXPOINT_PRECISION) & src_wrapmask];
			src_fx += src_fdx;

			if (pix_data)
			{
				dst_base[dst_offset] = pal_base[pix_data];
			}
		}
		while (dst_offset += dst_adv);
	}

#undef FIXPOINT_PRECISION
#undef FIXPOINT_PRECISION_HALF
}

void k053250ps_device::draw( bitmap_rgb32 &bitmap, const rectangle &cliprect, int colorbase, int flags, bitmap_ind8 &priority_bitmap, int priority )
{
	static int16_t scroll_x;
	
	if (machine().input().code_pressed(KEYCODE_A))
	{
		scroll_x--;
		popmessage("SCROLL: %d\n", scroll_x);
	}
	
	else if (machine().input().code_pressed(KEYCODE_S))
	{
		scroll_x++;
		popmessage("SCROLL: %d\n", scroll_x);
	}
	
	uint8_t *pix_ptr;
	const pen_t *pal_base, *pal_ptr;
	uint32_t src_clipmask, src_wrapmask; //, dst_wrapmask;
	int linedata_offs, line_pos, line_start, line_end, scroll_corr;
	int color, offset, zoom, scroll, passes, i;
	bool wrap500 = false;

	uint16_t *line_ram = m_buffer[0];                // pointer to physical line RAM
	int map_scrollx = short(m_regs[0] << 8 | m_regs[1]) - m_offx; // signed horizontal scroll value
	int map_scrolly = short(m_regs[2] << 8 | m_regs[3]) - m_offy; // signed vertical scroll value
	uint8_t ctrl = m_regs[4];                                   // register four is the main control register

	// copy visible boundary values to more accessible locations
	int dst_minx  = cliprect.min_x;
	int dst_maxx  = cliprect.max_x;
	int dst_miny  = cliprect.min_y;
	int dst_maxy  = cliprect.max_y;

	int orientation  = 0;   // orientation defaults to no swapping and no flipping
	int dst_height   = 512; // virtual bitmap height defaults to 512 pixels
	int linedata_adv = 4;   // line info packets are four words(eight bytes) apart

	// switch X and Y parameters when the first bit of the control register is cleared
	if (!(ctrl & 0x01)) orientation |= ORIENTATION_SWAP_XY;

	// invert X parameters when the forth bit of the control register is set
	if   (ctrl & 0x08)  orientation |= ORIENTATION_FLIP_X;

	// invert Y parameters when the fifth bit of the control register is set
	if   (ctrl & 0x10)  orientation |= ORIENTATION_FLIP_Y;

	//printf("CTRL: %x\n", ctrl);
	
	// 00
	// 0x12
	// 0x10
	
	switch (ctrl >> 5) // the upper four bits of the control register select source and target dimensions
	{
		case 0 :
			// PirateSH
			// Xexex: L6 galaxies
			// Metam: L4 forest, L5 arena, L6 tower interior, final boss

			// crop source offset between 0 and 255 inclusive,
			// and set virtual bitmap height to 256 pixels
			src_wrapmask = src_clipmask = 0xff;
			dst_height = 0x100;
		break;
		case 1 :
			// Xexex: prologue, L7 nebulae

			// the source offset is cropped to 0 and 511 inclusive
			src_wrapmask = src_clipmask = 0x1ff;
		break;
		case 4 :
			// Xexex: L1 sky and boss, L3 planet, L5 poly-face, L7 battle ship patches
			// Metam: L1 summoning circle, L3 caves, L6 gargoyle towers

			// crop source offset between 0 and 255 inclusive,
			// and allow source offset to wrap back at 0x500 to -0x300
			src_wrapmask = src_clipmask = 0xff;
			wrap500 = true;
		break;
//      case 2 : // Xexex: title
//      case 7 : // Xexex: L4 organic stage
		default:
			// crop source offset between 0 and 1023 inclusive,
			// keep other dimensions to their defaults
			src_wrapmask = src_clipmask = 0x3ff;
		break;
	}

	// disable source clipping when the third bit of the control register is set
	if (ctrl & 0x04)
		src_clipmask = 0;

	if (!(orientation & ORIENTATION_SWAP_XY))   // normal orientaion with no X Y switching
	{
		line_start = dst_miny;          // the first scanline starts at the minimum Y clip location
		line_end   = dst_maxy;          // the last scanline ends at the maximum Y clip location
		scroll_corr = map_scrollx;      // concentrate global X scroll
		linedata_offs = map_scrolly;    // determine where to get info for the first line

		if (orientation & ORIENTATION_FLIP_X)
		{
			scroll_corr = -scroll_corr; // X scroll adjustment should be negated in X flipped scenarioes
		}

		if (orientation & ORIENTATION_FLIP_Y)
		{
			linedata_adv = -linedata_adv;           // traverse line RAM backward in Y flipped scenarioes
			linedata_offs += bitmap.height() - 1;   // and get info for the first line from the bottom
		}

//		dst_wrapmask = ~0;  // scanlines don't seem to wrap horizontally in normal orientation
		passes = 1;         // draw scanline in a single pass
	}
	else  // orientaion with X and Y parameters switched
	{
		line_start = dst_minx;          // the first scanline starts at the minimum X clip location
		line_end   = dst_maxx;          // the last scanline ends at the maximum X clip location
		scroll_corr = map_scrolly;      // concentrate global Y scroll
		linedata_offs = map_scrollx;    // determine where to get info for the first line

		if (orientation & ORIENTATION_FLIP_Y)
		{
			scroll_corr = 0x100 - scroll_corr;  // apply common vertical correction

			// Y correction (ref: 1st and 5th boss)
			scroll_corr -= 2;   // apply unique vertical correction

			// X correction (ref: 1st boss, seems to undo non-rotated global X offset)
			linedata_offs -= 5; // apply unique horizontal correction
		}

		if (orientation & ORIENTATION_FLIP_X)
		{
			linedata_adv = -linedata_adv;       // traverse line RAM backward in X flipped scenarioes
			linedata_offs += bitmap.width() - 1;    // and get info for the first line from the bottom
		}

		if (src_clipmask)
		{
			// determine target wrap boundary and draw scanline in two passes if the source is clipped
//			dst_wrapmask = dst_height - 1;
			passes = 2;
		}
		else
		{
			// otherwise disable target wraparound and draw scanline in a single pass
//			dst_wrapmask = ~0;
			passes = 1;
		}
	}

	// PJB - HOW IS THIS DETERMINED?
	src_clipmask = 0;

	linedata_offs *= 4;                             // each line info packet has four words(eight bytes)
	linedata_offs &= 0x7ff;                         // and it should wrap at the four-kilobyte boundary
	linedata_offs += line_start * linedata_adv;     // pre-advance line info offset for the clipped region

	// load physical palette base
	pal_base = palette().pens() + (colorbase << 4) % palette().entries();
	
	//printf("Line Start: %u  Line End: %u  Advance: %u\n", line_start, line_end, linedata_adv);


	// walk the target bitmap within the visible area vertically or horizontally, one line at a time
	for (line_pos=line_start; line_pos <= line_end; linedata_offs += linedata_adv, line_pos++)
	{
		linedata_offs &= 0x7ff;                     // line info data wraps at the four-kilobyte boundary
		
		color  = line_ram[linedata_offs];           // get scanline color code
		if (color == 0xffff) continue;              // reject scanline if color code equals minus one

		offset   = line_ram[linedata_offs + 1];     // get first pixel offset in ROM
		if (!(color & 0xff) && !offset) continue;   // reject scanline if both color and pixel offset are 0

		// calculate physical palette location
		// there can be thirty-two color codes and each code represents sixteen pens
		pal_ptr = pal_base + ((color & 0x1f) << 4);

		// calculate physical pixel location
		// each offset unit represents 256 pixels and should wrap at ROM boundary for safety
		pix_ptr = &m_unpacked_rom[((offset << 8) % m_unpacked_rom.size())];

		// get scanline zoom factor
		// For example, 0x20 doubles the length, 0x40 maintains a one-to-one length,
		// and 0x80 halves the length. The zoom center is at the beginning of the
		// scanline therefore it is not necessary to adjust render start position
		zoom    = line_ram[linedata_offs + 2];

		scroll = ((short)line_ram[linedata_offs + 3]);   // get signed local scroll value for the current scanline
		
		// scavenged from old code; improves Xexex' first level sky
		if (wrap500 && scroll >= 0x500) scroll -= 0x800;
		
		if (1 && scroll >= 0x500) scroll -= 0x800;

		scroll += scroll_corr;  // apply final scroll correction
		// PJB
		//scroll &= src_wrapmask; // wraparound scroll value if necessary

		if (0)
		{
			printf("%u: [%x] COLR:%x OFFS:%x ZOOM:%x SCRL:%d (%.4x)\n", line_pos, linedata_offs, color, offset, zoom, scroll, line_ram[linedata_offs + 3]);
		}
		
		
		// draw scanlines wrapped at virtual bitmap boundary in two passes
		// this should not impose too much overhead due to clipping performed by the render code
		i = passes;
		do
		{
			/*
			    Parameter descriptions:

			    bitmap       : pointer to a MAME bitmap as the render target
			    pal_ptr      : pointer to the palette's physical location relative to the scanline
			    pix_ptr      : pointer to the physical start location of source pixels in ROM
			    cliprect     : pointer to a rectangle structue which describes the visible area of the target bitmap
			    line_pos     : scanline render position relative to the target bitmap
			                   should be a Y offset to the target bitmap in normal orientaion,
			                   or an X offset to the target bitmap if X,Y are swapped
			    scroll       : source scroll value of the scanline
			    zoom         : source zoom factor of the scanline
			    src_clipmask : source offset clip mask; source pixels with offsets beyond the scope of this mask will not be drawn
			    src_wrapmask : source offset wrap mask; wraps source offset around, no effect when src_clipmask is set
			    orientation  : flags indicating whether scanlines should be drawn horizontally, vertically, forward or backward
			    priority     : value to be written to the priority bitmap, no effect when equals 0
			*/
			pdraw_scanline32(bitmap, pal_ptr, pix_ptr, cliprect,
				line_pos, scroll, zoom, src_clipmask, src_wrapmask, orientation, priority_bitmap, (uint8_t)priority);

			// shift scanline position one virtual screen upward to render the wrapped end if necessary
			scroll -= dst_height;
		}
		while (--i);
	}
}

READ16_MEMBER(k053250ps_device::reg_r)
{
	return m_regs[offset];
}


void k053250ps_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
	switch(m_timer_lvcdma_state)
	{
		case OD_WAIT_START:
			m_timer_lvcdma_state = OD_WAIT_END;
			m_timer_lvcdma->adjust(attotime::from_ticks(4096, clock()));
			m_dmairq_cb(ASSERT_LINE);
			
//			memcpy(m_buffer[m_page], &m_ram[0], 0x1000);
//			m_page ^= 1;

			break;
			
		case OD_WAIT_END:
			m_timer_lvcdma_state = OD_IDLE;
			m_timer_lvcdma->adjust(attotime::never);
			m_dmairq_cb(CLEAR_LINE);
			
			if(/*(m_regs[4] & 0x02) &&*/ !m_dmairq_on)
			{
				m_dmairq_on = true;
				m_dmairq_cb(ASSERT_LINE);
			}
			break;
	}
}

WRITE_LINE_MEMBER(k053250ps_device::vblank_w)
{
	if (state == 1)
	{
		if (1)
		{
			if(m_dmairq_on)
			{
				m_dmairq_on = false;
				m_dmairq_cb(CLEAR_LINE);
			}
			m_timer_lvcdma_state = OD_WAIT_START;
			m_timer_lvcdma->adjust(attotime::from_ticks(256, clock()));
		}
		else
		{
			//memset(m_sram, 0, sizeof(m_sram));
		}
	}
}

READ_LINE_MEMBER(k053250ps_device::dmairq_r)
{
	return !m_dmairq_on;
}


WRITE16_MEMBER(k053250ps_device::reg_w)
{
#if 0
	static const char * regnames[] =
	{
		"SCROLL_X_L",
		"SCROLL_X_H",
		"SCROLL_Y_L",
		"SCROLL_X_H",
		"DMA Control",
		"UNKNOWN",
		"ROM_H",
		"ROM_L",
	};

	printf("053250 REG_W[%x] (%s): %.2x\n", offset, regnames[offset], data & 0xff);
#endif
	if (ACCESSING_BITS_0_7)
		m_regs[offset] = data;
}

READ16_MEMBER(k053250ps_device::ram_r)
{
	return m_ram[offset];
}

WRITE16_MEMBER(k053250ps_device::ram_w)
{
	COMBINE_DATA(&m_ram[offset]);
}

READ16_MEMBER(k053250ps_device::rom_r)
{
	return m_rom[0x80000 * m_regs[6] + 0x800 * m_regs[7] + offset/2];
}