summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/video/kncljoe.cpp
blob: b600f77f02479a5e0b7c8ec01d12936a9b145b25 (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
// license:BSD-3-Clause
// copyright-holders:Ernesto Corvi
/***************************************************************************

Knuckle Joe - (c) 1985 Taito Corporation

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

#include "emu.h"
#include "includes/kncljoe.h"


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

  Convert the color PROMs into a more useable format.

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

void kncljoe_state::kncljoe_palette(palette_device &palette) const
{
	uint8_t const *color_prom = memregion("proms")->base();

	// create a lookup table for the palette
	for (int i = 0; i < 0x80; i++)
	{
		int const r = pal4bit(color_prom[i + 0x000]);
		int const g = pal4bit(color_prom[i + 0x100]);
		int const b = pal4bit(color_prom[i + 0x200]);

		palette.set_indirect_color(i, rgb_t(r, g, b));
	}

	for (int i = 0; i < 0x10; i++)
	{
		int bit0, bit1, bit2;

		// red component
		bit0 = 0;
		bit1 = BIT(color_prom[i + 0x300], 6);
		bit2 = BIT(color_prom[i + 0x300], 7);
		int const r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;

		// green component
		bit0 = BIT(color_prom[i + 0x300], 3);
		bit1 = BIT(color_prom[i + 0x300], 4);
		bit2 = BIT(color_prom[i + 0x300], 5);
		int const g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;

		// blue component
		bit0 = BIT(color_prom[i + 0x300], 0);
		bit1 = BIT(color_prom[i + 0x300], 1);
		bit2 = BIT(color_prom[i + 0x300], 2);
		int const b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;

		palette.set_indirect_color(i + 0x80, rgb_t(r, g, b));
	}

	// color_prom now points to the beginning of the lookup table
	color_prom += 0x320;

	// chars
	for (int i = 0; i < 0x80; i++)
		palette.set_pen_indirect(i, i);

	// sprite lookup table
	for (int i = 0; i < 0x80; i++)
	{
		uint8_t const ctabentry = (color_prom[i] & 0x0f) | 0x80;
		palette.set_pen_indirect(i + 0x80, ctabentry);
	}
}



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

  Callbacks for the TileMap code

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

TILE_GET_INFO_MEMBER(kncljoe_state::get_bg_tile_info)
{
	int attr = m_videoram[2 * tile_index + 1];
	int code = m_videoram[2 * tile_index] + ((attr & 0xc0) << 2) + (m_tile_bank << 10);

	tileinfo.set(0,
			code,
			attr & 0xf,
			TILE_FLIPXY((attr & 0x30) >> 4));
}



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

  Start the video hardware emulation.

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

void kncljoe_state::video_start()
{
	m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(kncljoe_state::get_bg_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 64, 32);

	m_bg_tilemap->set_scroll_rows(4);
}



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

  Memory handlers

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

WRITE8_MEMBER(kncljoe_state::kncljoe_videoram_w)
{
	m_videoram[offset] = data;
	m_bg_tilemap->mark_tile_dirty(offset / 2);
}

WRITE8_MEMBER(kncljoe_state::kncljoe_control_w)
{
	int i;
	/*
	        0x01    screen flip
	        0x02    coin counter#1
	        0x04    sprite bank
	        0x10    character bank
	        0x20    coin counter#2

	        reset when IN0 - Coin 1 goes low (active)
	        set after IN0 - Coin 1 goes high AND the credit has been added
	*/
	m_flipscreen = data & 0x01;
	machine().tilemap().set_flip_all(m_flipscreen ? TILEMAP_FLIPX : TILEMAP_FLIPY);

	machine().bookkeeping().coin_counter_w(0, data & 0x02);
	machine().bookkeeping().coin_counter_w(1, data & 0x20);

	i = (data & 0x10) >> 4;
	if (m_tile_bank != i)
	{
		m_tile_bank = i;
		m_bg_tilemap->mark_all_dirty();
	}

	i = (data & 0x04) >> 2;
	if (m_sprite_bank != i)
	{
		m_sprite_bank = i;
		memset(memregion("maincpu")->base() + 0xf100, 0, 0x180);
	}
}

WRITE8_MEMBER(kncljoe_state::kncljoe_scroll_w)
{
	int scrollx;

	m_scrollregs[offset] = data;
	scrollx = m_scrollregs[0] | m_scrollregs[1] << 8;
	m_bg_tilemap->set_scrollx(0, scrollx);
	m_bg_tilemap->set_scrollx(1, scrollx);
	m_bg_tilemap->set_scrollx(2, scrollx);
	m_bg_tilemap->set_scrollx(3, 0);
}



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

  Display refresh

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

void kncljoe_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect )
{
	uint8_t *spriteram = m_spriteram;
	rectangle clip = cliprect;
	gfx_element *gfx = m_gfxdecode->gfx(1 + m_sprite_bank);
	int i, j;
	static const int pribase[4]={0x0180, 0x0080, 0x0100, 0x0000};
	const rectangle &visarea = m_screen->visible_area();

	/* score covers sprites */
	if (m_flipscreen)
	{
		if (clip.max_y > visarea.max_y - 64)
			clip.max_y = visarea.max_y - 64;
	}
	else
	{
		if (clip.min_y < visarea.min_y + 64)
			clip.min_y = visarea.min_y + 64;
	}

	for (i = 0; i < 4; i++)
		for (j = 0x7c; j >= 0; j -= 4)
		{
			int offs = pribase[i] + j;
			int sy = spriteram[offs];
			int sx = spriteram[offs + 3];
			int code = spriteram[offs + 2];
			int attr = spriteram[offs + 1];
			int flipx = attr & 0x40;
			int flipy = !(attr & 0x80);
			int color = attr & 0x0f;

			if (attr & 0x10)
				code += 512;
			if (attr & 0x20)
				code += 256;

			if (m_flipscreen)
			{
				flipx = !flipx;
				flipy = !flipy;
				sx = 240 - sx;
				sy = 240 - sy;
			}

			if (sx >= 256-8)
				sx -= 256;

			gfx->transpen(bitmap,clip,
				code,
				color,
				flipx,flipy,
				sx,sy,0);
		}
}

uint32_t kncljoe_state::screen_update_kncljoe(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
	draw_sprites(bitmap, cliprect);
	return 0;
}