summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/video/canyon.cpp
blob: 7e22b311ebeafe73fe3b3b35e7f69004360f4a59 (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
// license:BSD-3-Clause
// copyright-holders:Mike Balfour
/***************************************************************************

Atari Canyon Bomber video emulation

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

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


WRITE8_MEMBER(canyon_state::canyon_videoram_w)
{
	m_videoram[offset] = data;
	m_bg_tilemap->mark_tile_dirty(offset);
}


TILE_GET_INFO_MEMBER(canyon_state::get_bg_tile_info)
{
	uint8_t code = m_videoram[tile_index];

	tileinfo.set(0, code & 0x3f, code >> 7, 0);
}


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


void canyon_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect )
{
	int i;

	for (i = 0; i < 2; i++)
	{
		int x = m_videoram[0x3d0 + 2 * i + 0x1];
		int y = m_videoram[0x3d0 + 2 * i + 0x8];
		int c = m_videoram[0x3d0 + 2 * i + 0x9];


			m_gfxdecode->gfx(1)->transpen(bitmap,cliprect,
			c >> 3,
			i,
			!(c & 0x80), 0,
			224 - x,
			240 - y, 0);
	}
}


void canyon_state::draw_bombs( bitmap_ind16 &bitmap, const rectangle &cliprect )
{
	int i;

	for (i = 0; i < 2; i++)
	{
		int sx = 254 - m_videoram[0x3d0 + 2 * i + 0x5];
		int sy = 246 - m_videoram[0x3d0 + 2 * i + 0xc];

		rectangle rect(sx, sx + 1, sy, sy + 1);
		rect &= cliprect;

		bitmap.fill(1 + 2 * i, rect);
	}
}


uint32_t canyon_state::screen_update_canyon(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);

	draw_sprites(bitmap, cliprect);

	draw_bombs(bitmap, cliprect);

	/* watchdog is disabled during service mode */
	m_watchdog->watchdog_enable(!(ioport("IN2")->read() & 0x10));

	return 0;
}