summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/video/darkmist.cpp
blob: 4734c7362a786212c5e4e9ce4e47d7caaa9b802c (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
// license:BSD-3-Clause
// copyright-holders:David Haywood, Nicola Salmoria, Tomasz Slanina
#include "emu.h"
#include "includes/darkmist.h"



/* vis. flags */

#define DISPLAY_SPR     1
#define DISPLAY_FG      2 /* 2 or 8 */
#define DISPLAY_BG      4
#define DISPLAY_TXT     16


TILE_GET_INFO_MEMBER(darkmist_state::get_bgtile_info)
{
	int code,attr,pal;

	code=memregion("bg_map")->base()[tile_index*2]; /* TTTTTTTT */
	attr=memregion("bg_map")->base()[(tile_index*2)+1]; /* -PPP--TT - FIXED BITS (0xxx00xx) */

	code+=(attr&3)<<8;
	pal=(attr>>4);

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

TILE_GET_INFO_MEMBER(darkmist_state::get_fgtile_info)
{
	int code,attr,pal;

	code = memregion("fg_map")->base()[tile_index*2]; /* TTTTTTTT */
	attr = memregion("fg_map")->base()[(tile_index*2)+1]; /* -PPP--TT - FIXED BITS (0xxx00xx) */

	code+=(attr&3)<<8;
	pal=attr>>4;

	pal+=16;

	SET_TILE_INFO_MEMBER(2,
		code,
		pal,
		0);
}

TILE_GET_INFO_MEMBER(darkmist_state::get_txttile_info)
{
	int code,attr,pal;

	code=m_videoram[tile_index];
	attr=m_videoram[tile_index+0x400];
	pal=(attr>>1);

	code+=(attr&1)<<8;

	pal+=48;

	SET_TILE_INFO_MEMBER(0,
		code,
		pal,
		0);
}

PALETTE_INIT_MEMBER(darkmist_state, darkmist)
{
	const uint8_t *bg_clut = memregion("bg_clut")->base();
	const uint8_t *fg_clut = memregion("fg_clut")->base();
	const uint8_t *spr_clut = memregion("spr_clut")->base();
	const uint8_t *tx_clut = memregion("tx_clut")->base();

	palette.set_indirect_color(0x100, rgb_t::black);

	for (int i = 0; i < 0x400; i++)
	{
		int ctabentry;
		uint8_t clut = 0;

		switch (i & 0x300)
		{
			case 0x000:  clut = bg_clut[i&0xff]; break;
			case 0x100:  clut = fg_clut[i&0xff]; break;
			case 0x200:  clut = spr_clut[i&0xff]; break;
			case 0x300:  clut = tx_clut[i&0xff]; break;
		}

		if (clut & 0x40) // 0x40 indicates non-transparent
			ctabentry = 0x100;
		else
		{
			ctabentry = (clut & 0x3f);

			switch (i & 0x300)
			{
			case 0x000:  ctabentry = ctabentry | 0x80; break;
			case 0x100:  ctabentry = ctabentry | 0x00; break;
			case 0x200:  ctabentry = ctabentry | 0x40; break;
			case 0x300:  ctabentry = ctabentry | 0xc0; break;
			}
		}

		palette.set_pen_indirect(i, ctabentry);
	}
}


void darkmist_state::video_start()
{
	m_bgtilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(darkmist_state::get_bgtile_info),this),TILEMAP_SCAN_ROWS,16,16,512,64 );
	m_fgtilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(darkmist_state::get_fgtile_info),this),TILEMAP_SCAN_ROWS,16,16,64,256 );
	m_txtilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(darkmist_state::get_txttile_info),this),TILEMAP_SCAN_ROWS,8,8,32,32 );
	m_fgtilemap->set_transparent_pen(0);
	m_txtilemap->set_transparent_pen(0);

	save_item(NAME(m_hw));
}

uint32_t darkmist_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
#define DM_GETSCROLL(n) (((m_scroll[(n)]<<1)&0xff) + ((m_scroll[(n)]&0x80)?1:0) +( ((m_scroll[(n)-1]<<4) | (m_scroll[(n)-1]<<12) )&0xff00))

	m_bgtilemap->set_scrollx(0, DM_GETSCROLL(0x2));
	m_bgtilemap->set_scrolly(0, DM_GETSCROLL(0x6));
	m_fgtilemap->set_scrollx(0, DM_GETSCROLL(0xa));
	m_fgtilemap->set_scrolly(0, DM_GETSCROLL(0xe));

	bitmap.fill(m_palette->black_pen(), cliprect);

	if(m_hw & DISPLAY_BG)
		m_bgtilemap->draw(screen, bitmap, cliprect, 0,0);

	if(m_hw & DISPLAY_FG)
		m_fgtilemap->draw(screen, bitmap, cliprect, 0,0);

	if(m_hw & DISPLAY_SPR)
	{
/*
    Sprites

    76543210
0 - TTTT TTTT - tile
1 - xyBP PPP? - palette (P), flips (x,y), B - use spritebank,
                ? - unknown, according to gamecode top bit of one of coords(y/x)
2 - YYYY YYYY - y coord
3 - XXXX XXXX - x coord

*/
		int i,fx,fy,tile,palette;
		for(i=0;i<m_spriteram.bytes();i+=32)
		{
			fy=m_spriteram[i+1]&0x40;
			fx=m_spriteram[i+1]&0x80;

			tile=m_spriteram[i+0];

			if(m_spriteram[i+1]&0x20)
				tile += (*m_spritebank << 8);

			palette=((m_spriteram[i+1])>>1)&0xf;

			if(m_spriteram[i+1]&0x1)
				palette=machine().rand()&15;

			palette+=32;


				m_gfxdecode->gfx(3)->transpen(
				bitmap,cliprect,
				tile,
				palette,
				fx,fy,
				m_spriteram[i+3],m_spriteram[i+2],0 );
		}
	}

	if(m_hw & DISPLAY_TXT)
	{
		m_txtilemap->mark_all_dirty();
		m_txtilemap->draw(screen, bitmap, cliprect, 0,0);
	}


	return 0;
}