summaryrefslogtreecommitdiffstats
path: root/src/mame/video/battlane.cpp
blob: b2370d742fc372ab8e78db27f0edb6fc0022b249 (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
// license:BSD-3-Clause
// copyright-holders:Paul Leaman
/***************************************************************************

    Battle Lane Vol. 5

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

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


void battlane_state::battlane_palette_w(offs_t offset, uint8_t data)
{
	int r, g, b;
	int bit0, bit1, bit2;

	// red component
	bit0 = (~data >> 0) & 0x01;
	bit1 = (~data >> 1) & 0x01;
	bit2 = (~data >> 2) & 0x01;
	r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;

	// green component
	bit0 = (~data >> 3) & 0x01;
	bit1 = (~data >> 4) & 0x01;
	bit2 = (~data >> 5) & 0x01;
	g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;

	// blue component
	bit0 = (~m_video_ctrl >> 7) & 0x01;
	bit1 = (~data >> 6) & 0x01;
	bit2 = (~data >> 7) & 0x01;
	b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;

	m_palette->set_pen_color(offset, rgb_t(r, g, b));
}

void battlane_state::battlane_scrollx_w(uint8_t data)
{
	m_bg_tilemap->set_scrollx(0, ((m_video_ctrl & 0x01) << 8) + data);
}

void battlane_state::battlane_scrolly_w(uint8_t data)
{
	m_bg_tilemap->set_scrolly(0, ((m_cpu_control & 0x01) << 8) + data);
}

void battlane_state::battlane_tileram_w(offs_t offset, uint8_t data)
{
	m_tileram[offset] = data;
	m_bg_tilemap->mark_tile_dirty(offset & 0x3ff);
}

void battlane_state::battlane_spriteram_w(offs_t offset, uint8_t data)
{
	m_spriteram[offset] = data;
}

void battlane_state::battlane_bitmap_w(offs_t offset, uint8_t data)
{
	int orval = (~m_video_ctrl >> 1) & 0x07;
	if (!orval)
		orval = 7;

	for (int i = 0; i < 8; i++)
	{
		if (data & 1 << i)
		{
			m_screen_bitmap.pix(offset & 0xff, (offset >> 8 ) * 8 + i) |= orval;
		}
		else
		{
			m_screen_bitmap.pix(offset & 0xff, (offset >> 8) * 8 + i) &= ~orval;
		}
	}
}

void battlane_state::battlane_video_ctrl_w(uint8_t data)
{
	/*
	    Video control register

	        0x80    = low bit of blue component (taken when writing to palette)
	        0x0e    = Bitmap plane (bank?) select  (0-7)
	        0x01    = Scroll MSB
	*/

	m_video_ctrl = data;
}

TILE_GET_INFO_MEMBER(battlane_state::get_tile_info_bg)
{
	int code = m_tileram[tile_index];
	int attr = m_tileram[tile_index + 0x400];
	int gfxn = (attr & 0x01) + 1;
	int color = (attr >> 1) & 0x03;

	tileinfo.set(gfxn, code, color, 0);
}

TILEMAP_MAPPER_MEMBER(battlane_state::battlane_tilemap_scan_rows_2x2)
{
	/*
	        Tilemap Memory Organization

	     0              15 16            31
	    +-----------------+----------------+
	    |0              15|256             |0
	    |                 |                |
	    |     screen 0    |    screen 1    |
	    |                 |                |
	    |240           255|             511|15
	    +-----------------+----------------+
	    |512              |768             |16
	    |                 |                |
	    |     screen 2    |    screen 3    |
	    |                 |                |
	    |              767|            1023|31
	    +-----------------+-----------------

	*/

	return (row & 0xf) * 16 + (col & 0xf) + (row & 0x10) * 32 + (col & 0x10) * 16;
}


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

  Start the video hardware emulation.

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

void battlane_state::video_start()
{
	m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(battlane_state::get_tile_info_bg)), tilemap_mapper_delegate(*this, FUNC(battlane_state::battlane_tilemap_scan_rows_2x2)), 16, 16, 32, 32);
	m_screen_bitmap.allocate(32 * 8, 32 * 8);
	save_item(NAME(m_screen_bitmap));
}

void battlane_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	int offs, attr, code, color, sx, sy, flipx, flipy;

	for (offs = 0; offs < 0x100; offs += 4)
	{
		/*
		    0x80 = Bank 2
		    0x40 =
		    0x20 = Bank 1
		    0x10 = Y Double
		    0x08 = Color
		    0x04 = X Flip
		    0x02 = Y Flip
		    0x01 = Sprite Enable
		*/

		attr = m_spriteram[offs + 1];
		code = m_spriteram[offs + 3];

		code += 256 * ((attr >> 6) & 0x02);
		code += 256 * ((attr >> 5) & 0x01);

		if (attr & 0x01)
		{
			color = BIT(attr, 3);

			sx = m_spriteram[offs + 2];
			sy = m_spriteram[offs];

			flipx = BIT(attr, 2);
			flipy = BIT(attr, 1);

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

			if (attr & 0x10) // Y Double
			{
				for (int i = 0; i < 2; i++)
					m_gfxdecode->gfx(0)->transpen(bitmap,cliprect,
						code + i,
						color,
						flipx, flipy,
						sx, sy - (16 * (i ^ flipy)), 0);
			}
			else
			{
				m_gfxdecode->gfx(0)->transpen(bitmap,cliprect,
					code,
					color,
					flipx, flipy,
					sx, sy, 0);
			}
		}
	}
}

void battlane_state::draw_fg_bitmap(bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	for (int y = 0; y < 32 * 8; y++)
	{
		for (int x = 0; x < 32 * 8; x++)
		{
			int const data = m_screen_bitmap.pix(y, x);

			if (data)
			{
				int px = x, py = y;
				if (flip_screen())
				{
					px = 255 - px;
					py = 255 - py;
				}

				if (cliprect.contains(px, py))
					bitmap.pix(y, x) = data;
			}
		}
	}
}

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