summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/video/taotaido.cpp
blob: 2da4879bcff4adef3e5977094b1f68d4a52fb86f (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
// license:BSD-3-Clause
// copyright-holders:David Haywood
/* Tao Taido Video Hardware */

/*

its similar to other video system games

zooming might be wrong (only used on title logo?)

*/

#include "emu.h"
#include "includes/taotaido.h"
#include "screen.h"

/* sprite tile codes 0x4000 - 0x7fff get remapped according to the content of these registers */
WRITE8_MEMBER(taotaido_state::spritebank_w)
{
	m_spritebank[offset] = data;
}

/* sprites are like the other video system / psikyo games, we can merge this with aerofgt and plenty of other
   things eventually */


/* the tilemap */

WRITE16_MEMBER(taotaido_state::tileregs_w)
{
	switch (offset)
	{
		case 0: // would normally be x scroll?
		case 1: // would normally be y scroll?
		case 2:
		case 3:
			logerror ("unhanded tilemap register write offset %02x data %04x \n",offset,data);
			break;

		/* tile banks */
		case 4:
		case 5:
		case 6:
		case 7:
			if(ACCESSING_BITS_8_15)
				m_bgbank[(offset - 4) << 1] = data >> 8;
			if(ACCESSING_BITS_0_7)
				m_bgbank[((offset - 4) << 1) + 1] = data & 0xff;
			m_bg_tilemap->mark_all_dirty();
			break;
	}
}

WRITE16_MEMBER(taotaido_state::bgvideoram_w)
{
	COMBINE_DATA(&m_bgram[offset]);
	m_bg_tilemap->mark_tile_dirty(offset);
}

TILE_GET_INFO_MEMBER(taotaido_state::bg_tile_info)
{
	int code = m_bgram[tile_index] & 0x01ff;
	int bank =(m_bgram[tile_index] & 0x0e00) >> 9;
	int col  =(m_bgram[tile_index] & 0xf000) >> 12;

	code |= m_bgbank[bank] << 9;

	SET_TILE_INFO_MEMBER(1, code, col, 0);
}

TILEMAP_MAPPER_MEMBER(taotaido_state::tilemap_scan_rows)
{
	/* logical (col,row) -> memory offset */
	return (col & 0x3f) | ((row & 0x3f) << 6) | ((col & 0x40) << 6);
}


uint32_t taotaido_state::tile_callback( uint32_t code )
{
	code = m_spriteram2_older[code & 0x7fff];

	if (code > 0x3fff)
	{
		int block = (code & 0x3800) >> 11;
		code &= 0x07ff;
		code |= m_spritebank[block] << 11;
	}

	return code;
}


void taotaido_state::video_start()
{
	m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(taotaido_state::bg_tile_info)), tilemap_mapper_delegate(*this, FUNC(taotaido_state::tilemap_scan_rows)), 16,16, 128,64);

	m_spriteram_old = std::make_unique<uint16_t[]>(0x2000/2);
	m_spriteram_older = std::make_unique<uint16_t[]>(0x2000/2);

	m_spriteram2_old = std::make_unique<uint16_t[]>(0x10000/2);
	m_spriteram2_older = std::make_unique<uint16_t[]>(0x10000/2);

	save_item(NAME(m_bgbank));
	save_pointer(NAME(m_spriteram_old), 0x2000/2);
	save_pointer(NAME(m_spriteram_older), 0x2000/2);
	save_pointer(NAME(m_spriteram2_old), 0x10000/2);
	save_pointer(NAME(m_spriteram2_older), 0x10000/2);
}


uint32_t taotaido_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
//  m_bg_tilemap->set_scrollx(0,(m_scrollram[0x380/2]>>4)); // the values put here end up being wrong every other frame
//  m_bg_tilemap->set_scrolly(0,(m_scrollram[0x382/2]>>4)); // the values put here end up being wrong every other frame

	/* not amazingly efficient however it should be functional for row select and linescroll */
	rectangle clip = cliprect;

	for (int line = cliprect.top(); line <= cliprect.bottom(); line++)
	{
		clip.min_y = clip.max_y = line;

		m_bg_tilemap->set_scrollx(0, ((m_scrollram[(0x00 + 4 * line) / 2]) >> 4) + 30);
		m_bg_tilemap->set_scrolly(0, ((m_scrollram[(0x02 + 4 * line) / 2]) >> 4) - line);

		m_bg_tilemap->draw(screen, bitmap, clip, 0,0);
	}

	m_spr->draw_sprites(m_spriteram_older.get(), m_spriteram.bytes(), screen, bitmap, cliprect);
	return 0;
}

WRITE_LINE_MEMBER(taotaido_state::screen_vblank)
{
	// rising edge
	if (state)
	{
		/* sprites need to be delayed by 2 frames? */

		memcpy(m_spriteram2_older.get(),m_spriteram2_old.get(),0x10000);
		memcpy(m_spriteram2_old.get(),m_spriteram2,0x10000);

		memcpy(m_spriteram_older.get(),m_spriteram_old.get(),0x2000);
		memcpy(m_spriteram_old.get(),m_spriteram,0x2000);
	}
}