summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/video/jackal.cpp
blob: f40953f0984bb81e7e399a2e697c1233d5a4827a (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
// license:BSD-3-Clause
// copyright-holders:Curt Coder
// thanks-to:Kenneth Lin (original driver author)
/***************************************************************************

  video.c

  Functions to emulate the video hardware of the machine.

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

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


PALETTE_INIT_MEMBER(jackal_state, jackal)
{
	const uint8_t *color_prom = memregion("proms")->base();
	int i;

	for (i = 0; i < 0x100; i++)
	{
		uint16_t ctabentry = i | 0x100;
		palette.set_pen_indirect(i, ctabentry);
	}

	for (i = 0x100; i < 0x200; i++)
	{
		uint16_t ctabentry = color_prom[i - 0x100] & 0x0f;
		palette.set_pen_indirect(i, ctabentry);
	}

	for (i = 0x200; i < 0x300; i++)
	{
		uint16_t ctabentry = (color_prom[i - 0x100] & 0x0f) | 0x10;
		palette.set_pen_indirect(i, ctabentry);
	}
}


void jackal_state::jackal_mark_tile_dirty( int offset )
{
	m_bg_tilemap->mark_tile_dirty(offset);
}

TILE_GET_INFO_MEMBER(jackal_state::get_bg_tile_info)
{
	uint8_t *RAM = memregion("master")->base();

	int attr = RAM[0x2000 + tile_index];
	int code = RAM[0x2400 + tile_index] + ((attr & 0xc0) << 2) + ((attr & 0x30) << 6);
	int color = 0;//attr & 0x0f;
	int flags = ((attr & 0x10) ? TILE_FLIPX : 0) | ((attr & 0x20) ? TILE_FLIPY : 0);

	SET_TILE_INFO_MEMBER(0, code, color, flags);
}

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

void jackal_state::draw_background( screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect )
{
	uint8_t *RAM = memregion("master")->base();
	int i;

	m_scrollram = &RAM[0x0020];

	m_bg_tilemap->set_scroll_rows(1);
	m_bg_tilemap->set_scroll_cols(1);

	m_bg_tilemap->set_scrolly(0, m_videoctrl[0]);
	m_bg_tilemap->set_scrollx(0, m_videoctrl[1]);

	if (m_videoctrl[2] & 0x02)
	{
		if (m_videoctrl[2] & 0x08)
		{
			m_bg_tilemap->set_scroll_rows(32);

			for (i = 0; i < 32; i++)
				m_bg_tilemap->set_scrollx(i, m_scrollram[i]);
		}

		if (m_videoctrl[2] & 0x04)
		{
			m_bg_tilemap->set_scroll_cols(32);

			for (i = 0; i < 32; i++)
				m_bg_tilemap->set_scrolly(i, m_scrollram[i]);
		}
	}

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

#define DRAW_SPRITE(bank, code, sx, sy)  m_gfxdecode->gfx(bank)->transpen(bitmap,cliprect, code, color, flipx, flipy, sx, sy, 0);

void jackal_state::draw_sprites_region( bitmap_ind16 &bitmap, const rectangle &cliprect, const uint8_t *sram, int length, int bank )
{
	int offs;

	for (offs = 0; offs < length; offs += 5)
	{
		int sn1 = sram[offs];
		int sn2 = sram[offs + 1];
		int sy  = sram[offs + 2];
		int sx  = sram[offs + 3];
		int attr = sram[offs + 4];
		int flipx = attr & 0x20;
		int flipy = attr & 0x40;
		int color = ((sn2 & 0xf0) >> 4);

		if (attr & 0x01)
			sx = sx - 256;
		if (sy > 0xf0)
			sy = sy - 256;

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

		if (attr & 0xC)    // half-size sprite
		{
			int spritenum = sn1 * 4 + ((sn2 & (8 + 4)) >> 2) + ((sn2 & (2 + 1)) << 10);
			int mod = -8;

			if (flip_screen())
			{
				sx += 8;
				sy -= 8;
				mod = 8;
			}

			if ((attr & 0x0C) == 0x0C)
			{
				if (flip_screen()) sy += 16;
				DRAW_SPRITE(bank + 1, spritenum, sx, sy)
			}

			if ((attr & 0x0C) == 0x08)
			{
				sy += 8;
				DRAW_SPRITE(bank + 1, spritenum,     sx, sy)
				DRAW_SPRITE(bank + 1, spritenum - 2, sx, sy + mod)
			}

			if ((attr & 0x0C) == 0x04)
			{
				DRAW_SPRITE(bank + 1, spritenum,     sx,       sy)
				DRAW_SPRITE(bank + 1, spritenum + 1, sx + mod, sy)
			}
		}
		else
		{
			int spritenum = sn1 + ((sn2 & 0x03) << 8);

			if (attr & 0x10)
			{
				if (flip_screen())
				{
					sx -= 16;
					sy -= 16;
				}

				DRAW_SPRITE(bank, spritenum,     flipx ? sx+16 : sx, flipy ? sy+16 : sy)
				DRAW_SPRITE(bank, spritenum + 1, flipx ? sx : sx+16, flipy ? sy+16 : sy)
				DRAW_SPRITE(bank, spritenum + 2, flipx ? sx+16 : sx, flipy ? sy : sy+16)
				DRAW_SPRITE(bank, spritenum + 3, flipx ? sx : sx+16, flipy ? sy : sy+16)
			}
			else
			{
				DRAW_SPRITE(bank, spritenum, sx, sy)
			}
		}
	}
}

void jackal_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect )
{
	uint8_t *RAM = memregion("master")->base();
	uint8_t *sr, *ss;

	if (m_videoctrl[0x03] & 0x08)
	{
		sr = &RAM[0x03800]; // Sprite 2
		ss = &RAM[0x13800]; // Additional Sprite 2
	}
	else
	{
		sr = &RAM[0x03000]; // Sprite 1
		ss = &RAM[0x13000]; // Additional Sprite 1
	}

	draw_sprites_region(bitmap, cliprect, ss, 0x0f5, 3);
	draw_sprites_region(bitmap, cliprect, sr, 0x500, 1);
}

uint32_t jackal_state::screen_update_jackal(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	draw_background(screen, bitmap, cliprect);
	draw_sprites(bitmap, cliprect);
	return 0;
}