summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/video/dynduke.c
blob: fd727a55788442317ea92e6502ad243ec72991cb (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
// license:BSD-3-Clause
// copyright-holders:Bryan McPhail, David Haywood
#include "emu.h"
#include "includes/dynduke.h"



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

WRITE16_MEMBER(dynduke_state::paletteram_w)
{
	COMBINE_DATA(&m_generic_paletteram_16[offset]);
	int color=m_generic_paletteram_16[offset];
	m_palette->set_pen_color(offset,pal4bit(color >> 0),pal4bit(color >> 4),pal4bit(color >> 8));
}

WRITE16_MEMBER(dynduke_state::background_w)
{
	COMBINE_DATA(&m_back_data[offset]);
	m_bg_layer->mark_tile_dirty(offset);
}

WRITE16_MEMBER(dynduke_state::foreground_w)
{
	COMBINE_DATA(&m_fore_data[offset]);
	m_fg_layer->mark_tile_dirty(offset);
}

WRITE16_MEMBER(dynduke_state::text_w)
{
	COMBINE_DATA(&m_videoram[offset]);
	m_tx_layer->mark_tile_dirty(offset);
}

TILE_GET_INFO_MEMBER(dynduke_state::get_bg_tile_info)
{
	int tile=m_back_data[tile_index];
	int color=tile >> 12;

	tile=tile&0xfff;

	SET_TILE_INFO_MEMBER(1,
			tile+m_back_bankbase,
			color,
			0);
}

TILE_GET_INFO_MEMBER(dynduke_state::get_fg_tile_info)
{
	int tile=m_fore_data[tile_index];
	int color=tile >> 12;

	tile=tile&0xfff;

	SET_TILE_INFO_MEMBER(2,
			tile+m_fore_bankbase,
			color,
			0);
}

TILE_GET_INFO_MEMBER(dynduke_state::get_tx_tile_info)
{
	int tile=m_videoram[tile_index];
	int color=(tile >> 8) & 0x0f;

	tile = (tile & 0xff) | ((tile & 0xc000) >> 6);

	SET_TILE_INFO_MEMBER(0,
			tile,
			color,
			0);
}

void dynduke_state::video_start()
{
	m_bg_layer = &machine().tilemap().create(m_gfxdecode, tilemap_get_info_delegate(FUNC(dynduke_state::get_bg_tile_info),this),TILEMAP_SCAN_COLS,      16,16,32,32);
	m_fg_layer = &machine().tilemap().create(m_gfxdecode, tilemap_get_info_delegate(FUNC(dynduke_state::get_fg_tile_info),this),TILEMAP_SCAN_COLS,16,16,32,32);
	m_tx_layer = &machine().tilemap().create(m_gfxdecode, tilemap_get_info_delegate(FUNC(dynduke_state::get_tx_tile_info),this),TILEMAP_SCAN_ROWS, 8, 8,32,32);

	m_fg_layer->set_transparent_pen(15);
	m_tx_layer->set_transparent_pen(15);

	save_item(NAME(m_back_bankbase));
	save_item(NAME(m_fore_bankbase));
	save_item(NAME(m_back_enable));
	save_item(NAME(m_fore_enable));
	save_item(NAME(m_sprite_enable));
	save_item(NAME(m_txt_enable));
	save_item(NAME(m_old_back));
	save_item(NAME(m_old_fore));
}

WRITE16_MEMBER(dynduke_state::gfxbank_w)
{
	if (ACCESSING_BITS_0_7)
	{
		if (data&0x01) m_back_bankbase=0x1000; else m_back_bankbase=0;
		if (data&0x10) m_fore_bankbase=0x1000; else m_fore_bankbase=0;

		if (m_back_bankbase!=m_old_back)
			m_bg_layer->mark_all_dirty();
		if (m_fore_bankbase!=m_old_fore)
			m_fg_layer->mark_all_dirty();

		m_old_back=m_back_bankbase;
		m_old_fore=m_fore_bankbase;
	}
}


WRITE16_MEMBER(dynduke_state::control_w)
{
	if (ACCESSING_BITS_0_7)
	{
		// bit 0x80 toggles, maybe sprite buffering?
		// bit 0x40 is flipscreen
		// bit 0x20 not used?
		// bit 0x10 not used?
		// bit 0x08 is set on the title screen (sprite disable?)
		// bit 0x04 unused? txt disable?
		// bit 0x02 is used on the map screen (fore disable?)
		// bit 0x01 set when inserting coin.. bg disable?

		if (data&0x1) m_back_enable = 0; else m_back_enable = 1;
		if (data&0x2) m_fore_enable=0; else m_fore_enable=1;
		if (data&0x4) m_txt_enable = 0; else m_txt_enable = 1;
		if (data&0x8) m_sprite_enable=0; else m_sprite_enable=1;

		flip_screen_set(data & 0x40);
	}
}

void dynduke_state::draw_sprites(bitmap_ind16 &bitmap,const rectangle &cliprect,int pri)
{
	UINT16 *buffered_spriteram16 = m_spriteram->buffer();
	int offs,fx,fy,x,y,color,sprite;

	if (!m_sprite_enable) return;

	for (offs = 0x800-4;offs >= 0;offs -= 4)
	{
		/* Don't draw empty sprite table entries */
		if ((buffered_spriteram16[offs+3] >> 8)!=0xf) continue;
		if (((buffered_spriteram16[offs+2]>>13)&3)!=pri) continue;

		fx= buffered_spriteram16[offs+0]&0x2000;
		fy= buffered_spriteram16[offs+0]&0x4000;
		y = buffered_spriteram16[offs+0] & 0xff;
		x = buffered_spriteram16[offs+2] & 0xff;

		if (buffered_spriteram16[offs+2]&0x100) x=0-(0x100-x);

		color = (buffered_spriteram16[offs+0]>>8)&0x1f;
		sprite = buffered_spriteram16[offs+1];
		sprite &= 0x3fff;

		if (flip_screen()) {
			x=240-x;
			y=240-y;
			if (fx) fx=0; else fx=1;
			if (fy) fy=0; else fy=1;
		}

		m_gfxdecode->gfx(3)->transpen(bitmap,cliprect,
				sprite,
				color,fx,fy,x,y,15);
	}
}

void dynduke_state::draw_background(bitmap_ind16 &bitmap, const rectangle &cliprect, int pri )
{
	/* The transparency / palette handling on the background layer is very strange */
	bitmap_ind16 &bm = m_bg_layer->pixmap();
	int scrolly, scrollx;
	int x,y;

	/* if we're disabled, don't draw */
	if (!m_back_enable)
	{
		bitmap.fill(m_palette->black_pen(), cliprect);
		return;
	}

	scrolly = ((m_scroll_ram[0x01]&0x30)<<4)+((m_scroll_ram[0x02]&0x7f)<<1)+((m_scroll_ram[0x02]&0x80)>>7);
	scrollx = ((m_scroll_ram[0x09]&0x30)<<4)+((m_scroll_ram[0x0a]&0x7f)<<1)+((m_scroll_ram[0x0a]&0x80)>>7);

	for (y=0;y<256;y++)
	{
		int realy = (y + scrolly) & 0x1ff;
		UINT16 *src = &bm.pix16(realy);
		UINT16 *dst = &bitmap.pix16(y);


		for (x=0;x<256;x++)
		{
			int realx = (x + scrollx) & 0x1ff;
			UINT16 srcdat = src[realx];

			/* 0x01 - data bits
			   0x02
			   0x04
			   0x08
			   0x10 - extra colour bit? (first boss)
			   0x20 - priority over sprites
			   the old driver also had 'bg_palbase' but I don't see what it's for?
			*/

			if ((srcdat & 0x20) == pri)
			{
				if (srcdat & 0x10) srcdat += 0x400;
				//if (srcdat & 0x10) srcdat += machine().rand()&0x1f;

				srcdat = (srcdat & 0x000f) | ((srcdat & 0xffc0) >> 2);
				dst[x] = srcdat;
			}


		}
	}
}

UINT32 dynduke_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	/* Setup the tilemaps */
	m_fg_layer->set_scrolly(0, ((m_scroll_ram[0x11]&0x30)<<4)+((m_scroll_ram[0x12]&0x7f)<<1)+((m_scroll_ram[0x12]&0x80)>>7) );
	m_fg_layer->set_scrollx(0, ((m_scroll_ram[0x19]&0x30)<<4)+((m_scroll_ram[0x1a]&0x7f)<<1)+((m_scroll_ram[0x1a]&0x80)>>7) );
	m_fg_layer->enable(m_fore_enable);
	m_tx_layer->enable(m_txt_enable);


	draw_background(bitmap, cliprect,0x00);
	draw_sprites(bitmap,cliprect,0); // Untested: does anything use it? Could be behind background
	draw_sprites(bitmap,cliprect,1);
	draw_background(bitmap, cliprect,0x20);

	draw_sprites(bitmap,cliprect,2);
	m_fg_layer->draw(screen, bitmap, cliprect, 0,0);
	draw_sprites(bitmap,cliprect,3);
	m_tx_layer->draw(screen, bitmap, cliprect, 0,0);

	return 0;
}