summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/video/brkthru.c
blob: 6d1f9b175f8d19bdfacd8c4b5e642c0933e4cfba (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
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
/***************************************************************************

    video/brkthru.c

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

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


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

  Convert the color PROMs into a more useable format.

  Break Thru has one 256x8 and one 256x4 palette PROMs.
  I don't know for sure how the palette PROMs are connected to the RGB
  output, but it's probably the usual:

  bit 7 -- 220 ohm resistor  -- GREEN
        -- 470 ohm resistor  -- GREEN
        -- 1  kohm resistor  -- GREEN
        -- 2.2kohm resistor  -- GREEN
        -- 220 ohm resistor  -- RED
        -- 470 ohm resistor  -- RED
        -- 1  kohm resistor  -- RED
  bit 0 -- 2.2kohm resistor  -- RED

  bit 3 -- 220 ohm resistor  -- BLUE
        -- 470 ohm resistor  -- BLUE
        -- 1  kohm resistor  -- BLUE
  bit 0 -- 2.2kohm resistor  -- BLUE

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

void brkthru_state::palette_init()
{
	const UINT8 *color_prom = memregion("proms")->base();
	int i;

	for (i = 0; i < machine().total_colors(); i++)
	{
		int bit0, bit1, bit2, bit3, r, g, b;

		bit0 = (color_prom[0] >> 0) & 0x01;
		bit1 = (color_prom[0] >> 1) & 0x01;
		bit2 = (color_prom[0] >> 2) & 0x01;
		bit3 = (color_prom[0] >> 3) & 0x01;
		r = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
		bit0 = (color_prom[0] >> 4) & 0x01;
		bit1 = (color_prom[0] >> 5) & 0x01;
		bit2 = (color_prom[0] >> 6) & 0x01;
		bit3 = (color_prom[0] >> 7) & 0x01;
		g = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
		bit0 = (color_prom[machine().total_colors()] >> 0) & 0x01;
		bit1 = (color_prom[machine().total_colors()] >> 1) & 0x01;
		bit2 = (color_prom[machine().total_colors()] >> 2) & 0x01;
		bit3 = (color_prom[machine().total_colors()] >> 3) & 0x01;
		b = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;

		palette_set_color(machine(), i, MAKE_RGB(r,g,b));

		color_prom++;
	}
}



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

  Start the video hardware emulation.

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

TILE_GET_INFO_MEMBER(brkthru_state::get_bg_tile_info)
{
	/* BG RAM format
	    0         1
	    ---- -c-- ---- ---- = Color
	    ---- --xx xxxx xxxx = Code
	*/

	int code = (m_videoram[tile_index * 2] | ((m_videoram[tile_index * 2 + 1]) << 8)) & 0x3ff;
	int region = 1 + (code >> 7);
	int colour = m_bgbasecolor + ((m_videoram[tile_index * 2 + 1] & 0x04) >> 2);

	SET_TILE_INFO_MEMBER(m_gfxdecode, region, code & 0x7f, colour,0);
}

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


TILE_GET_INFO_MEMBER(brkthru_state::get_fg_tile_info)
{
	UINT8 code = m_fg_videoram[tile_index];
	SET_TILE_INFO_MEMBER(m_gfxdecode, 0, code, 0, 0);
}

WRITE8_MEMBER(brkthru_state::brkthru_fgram_w)
{
	m_fg_videoram[offset] = data;
	m_fg_tilemap->mark_tile_dirty(offset);
}

void brkthru_state::video_start()
{
	m_fg_tilemap = &machine().tilemap().create(tilemap_get_info_delegate(FUNC(brkthru_state::get_fg_tile_info),this), TILEMAP_SCAN_ROWS, 8, 8, 32, 32);
	m_bg_tilemap = &machine().tilemap().create(tilemap_get_info_delegate(FUNC(brkthru_state::get_bg_tile_info),this), TILEMAP_SCAN_COLS, 16, 16, 32, 16);

	m_fg_tilemap->set_transparent_pen(0);
	m_bg_tilemap->set_transparent_pen(0);
}


WRITE8_MEMBER(brkthru_state::brkthru_1800_w)
{
	if (offset == 0)    /* low 8 bits of scroll */
		m_bgscroll = (m_bgscroll & 0x100) | data;
	else if (offset == 1)
	{
		/* bit 0-2 = ROM bank select */
		membank("bank1")->set_entry(data & 0x07);

		/* bit 3-5 = background tiles color code */
		if (((data & 0x38) >> 2) != m_bgbasecolor)
		{
			m_bgbasecolor = (data & 0x38) >> 2;
			m_bg_tilemap->mark_all_dirty();
		}

		/* bit 6 = screen flip */
		if (m_flipscreen != (data & 0x40))
		{
			m_flipscreen = data & 0x40;
			m_bg_tilemap->set_flip(m_flipscreen ? (TILEMAP_FLIPY | TILEMAP_FLIPX) : 0);
			m_fg_tilemap->set_flip(m_flipscreen ? (TILEMAP_FLIPY | TILEMAP_FLIPX) : 0);

		}

		/* bit 7 = high bit of scroll */
		m_bgscroll = (m_bgscroll & 0xff) | ((data & 0x80) << 1);
	}
}


#if 0
void brkthru_state::show_register( bitmap_ind16 &bitmap, int x, int y, UINT32 data )
{
	char buf[5];

	sprintf(buf, "%04X", data);
	ui_draw_text(y, x, buf);
}
#endif


void brkthru_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect, int prio )
{
	int offs;
	/* Draw the sprites. Note that it is important to draw them exactly in this */
	/* order, to have the correct priorities. */

	/* Sprite RAM format
	    0         1         2         3
	    ccc- ---- ---- ---- ---- ---- ---- ---- = Color
	    ---d ---- ---- ---- ---- ---- ---- ---- = Double Size
	    ---- p--- ---- ---- ---- ---- ---- ---- = Priority
	    ---- -bb- ---- ---- ---- ---- ---- ---- = Bank
	    ---- ---e ---- ---- ---- ---- ---- ---- = Enable/Disable
	    ---- ---- ssss ssss ---- ---- ---- ---- = Sprite code
	    ---- ---- ---- ---- yyyy yyyy ---- ---- = Y position
	    ---- ---- ---- ---- ---- ---- xxxx xxxx = X position
	*/

	for (offs = 0;offs < m_spriteram.bytes(); offs += 4)
	{
		if ((m_spriteram[offs] & 0x09) == prio)  /* Enable && Low Priority */
		{
			int sx, sy, code, color;

			sx = 240 - m_spriteram[offs + 3];
			if (sx < -7)
				sx += 256;

			sy = 240 - m_spriteram[offs + 2];
			code = m_spriteram[offs + 1] + 128 * (m_spriteram[offs] & 0x06);
			color = (m_spriteram[offs] & 0xe0) >> 5;
			if (m_flipscreen)
			{
				sx = 240 - sx;
				sy = 240 - sy;
			}

			if (m_spriteram[offs] & 0x10)    /* double height */
			{
				m_gfxdecode->gfx(9)->transpen(bitmap,cliprect,
						code & ~1,
						color,
						m_flipscreen, m_flipscreen,
						sx, m_flipscreen ? sy + 16 : sy - 16,0);
				m_gfxdecode->gfx(9)->transpen(bitmap,cliprect,
						code | 1,
						color,
						m_flipscreen, m_flipscreen,
						sx,sy,0);

				/* redraw with wraparound */
				m_gfxdecode->gfx(9)->transpen(bitmap,cliprect,
						code & ~1,
						color,
						m_flipscreen, m_flipscreen,
						sx,(m_flipscreen ? sy + 16 : sy - 16) + 256,0);
				m_gfxdecode->gfx(9)->transpen(bitmap,cliprect,
						code | 1,
						color,
						m_flipscreen, m_flipscreen,
						sx,sy + 256,0);

			}
			else
			{
				m_gfxdecode->gfx(9)->transpen(bitmap,cliprect,
						code,
						color,
						m_flipscreen, m_flipscreen,
						sx,sy,0);

				/* redraw with wraparound */
				m_gfxdecode->gfx(9)->transpen(bitmap,cliprect,
						code,
						color,
						m_flipscreen, m_flipscreen,
						sx,sy + 256,0);

			}
		}
	}
}

UINT32 brkthru_state::screen_update_brkthru(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	m_bg_tilemap->set_scrollx(0, m_bgscroll);
	m_bg_tilemap->draw(screen, bitmap, cliprect, TILEMAP_DRAW_OPAQUE, 0);

	/* low priority sprites */
	draw_sprites(bitmap, cliprect, 0x01);

	/* draw background over low priority sprites */
	m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);

	/* high priority sprites */
	draw_sprites(bitmap, cliprect, 0x09);

	/* fg layer */
	m_fg_tilemap->draw(screen, bitmap, cliprect, 0, 0);

/*  show_register(bitmap, 8, 8, (UINT32)m_flipscreen); */

	return 0;
}