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
|
// license:BSD-3-Clause
// copyright-holders:Uki
/******************************************************************************
Markham (c) 1983 Sun Electronics
Strength & Skill (c) 1984 Sun Electronics
Video hardware driver by Uki
******************************************************************************/
#include "emu.h"
#include "includes/markham.h"
void markham_state::markham_palette(palette_device &palette) const
{
const uint8_t *color_prom = memregion("proms")->base();
// create a lookup table for the palette
for (int i = 0; i < 0x100; i++)
{
int const r = pal4bit(color_prom[i | 0x000]);
int const g = pal4bit(color_prom[i | 0x100]);
int const b = pal4bit(color_prom[i | 0x200]);
palette.set_indirect_color(i, rgb_t(r, g, b));
}
// color_prom now points to the beginning of the lookup table
color_prom += 0x300;
// sprites lookup table
for (int i = 0; i < 0x400; i++)
{
uint8_t const ctabentry = color_prom[i];
palette.set_pen_indirect(i, ctabentry);
}
}
void markham_state::videoram_w(offs_t offset, uint8_t data)
{
m_videoram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset / 2);
}
TILE_GET_INFO_MEMBER(markham_state::get_bg_tile_info)
{
int attr = m_videoram[tile_index * 2];
int code = m_videoram[(tile_index * 2) + 1] + ((attr & 0x60) << 3);
int color = (attr & 0x1f) | ((attr & 0x80) >> 2);
tileinfo.set(0, code, color, 0);
}
void markham_state::video_start()
{
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(markham_state::get_bg_tile_info)), TILEMAP_SCAN_COLS, 8, 8, 32, 32);
m_bg_tilemap->set_scroll_rows(32);
}
VIDEO_START_MEMBER(markham_state, strnskil)
{
video_start();
m_bg_tilemap->set_scroll_rows(32);
m_irq_scanline_start = 109;
m_irq_scanline_end = 240;
save_item(NAME(m_irq_source));
save_item(NAME(m_irq_scanline_start));
save_item(NAME(m_irq_scanline_end));
save_item(NAME(m_scroll_ctrl));
}
void markham_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect )
{
uint8_t *spriteram = m_spriteram;
int offs;
for (offs = 0x60; offs < 0x100; offs += 4)
{
int chr = spriteram[offs + 1];
int col = spriteram[offs + 2];
int fx = flip_screen();
int fy = flip_screen();
int x = spriteram[offs + 3];
int y = spriteram[offs + 0];
int px, py;
col &= 0x3f;
if (flip_screen() == 0)
{
px = x - 2;
py = 240 - y;
}
else
{
px = 240 - x;
py = y;
}
px = px & 0xff;
if (px > 248)
px = px - 256;
m_gfxdecode->gfx(1)->transmask(bitmap,cliprect,
chr,
col,
fx,fy,
px,py,
m_palette->transpen_mask(*m_gfxdecode->gfx(1), col, 0));
}
}
uint32_t markham_state::screen_update_markham(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
int row;
for (row = 0; row < 32; row++)
{
if ((row > 3) && (row < 16))
m_bg_tilemap->set_scrollx(row, m_xscroll[0]);
if (row >= 16)
m_bg_tilemap->set_scrollx(row, m_xscroll[1]);
}
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
draw_sprites(bitmap, cliprect);
return 0;
}
uint32_t markham_state::screen_update_strnskil(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
const uint8_t *scroll_data = (const uint8_t *)memregion("scroll_prom")->base();
int row;
for (row = 0; row < 32; row++)
{
switch (scroll_data[m_scroll_ctrl * 32 + row])
{
case 2:
m_bg_tilemap->set_scrollx(row, -~m_xscroll[1]);
break;
case 4:
m_bg_tilemap->set_scrollx(row, -~m_xscroll[0]);
break;
default:
// case 6 and 0
m_bg_tilemap->set_scrollx(row, 0);
break;
}
}
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
draw_sprites(bitmap, cliprect);
return 0;
}
|