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
|
// license:GPL-2.0+
// copyright-holders:David Graves, Jarek Burczynski
#include "emu.h"
#include "includes/darius.h"
#include "screen.h"
/***************************************************************************/
TILE_GET_INFO_MEMBER(darius_state::get_fg_tile_info)
{
u16 code = (m_fg_ram[tile_index + 0x2000] & 0x7ff);
u16 attr = m_fg_ram[tile_index];
tileinfo.set(2,
code,
(attr & 0x7f),
TILE_FLIPYX((attr & 0xc000) >> 14));
}
/***************************************************************************/
void darius_state::video_start()
{
m_gfxdecode->gfx(2)->set_granularity(16);
m_fg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(darius_state::get_fg_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 128, 64);
m_fg_tilemap->set_transparent_pen(0);
}
/***************************************************************************/
void darius_state::fg_layer_w(offs_t offset, u16 data, u16 mem_mask)
{
COMBINE_DATA(&m_fg_ram[offset]);
if (offset < 0x4000)
m_fg_tilemap->mark_tile_dirty((offset & 0x1fff));
}
/***************************************************************************/
void darius_state::draw_sprites(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect, int x_offs, int y_offs)
{
static const u32 primask[2] =
{
GFX_PMASK_2, // draw sprites with priority 0 which are under the mid layer
0 // draw sprites with priority 1 which are over the mid layer
};
for (int offs = 0; offs < m_spriteram.bytes() / 2; offs += 4)
{
const u32 code = m_spriteram[offs + 2] & 0x1fff;
if (code)
{
u16 data = m_spriteram[offs];
const int sy = (256 - data) & 0x1ff;
data = m_spriteram[offs + 1];
const int sx = data & 0x3ff;
data = m_spriteram[offs + 2];
const bool flipx = ((data & 0x4000) >> 14);
const bool flipy = ((data & 0x8000) >> 15);
data = m_spriteram[offs + 3];
const int priority = (data & 0x80) >> 7; // 0 = low
const u32 color = (data & 0x7f);
int curx = sx - x_offs;
int cury = sy + y_offs;
if (curx > 900) curx -= 1024;
if (cury > 400) cury -= 512;
m_gfxdecode->gfx(0)->prio_transpen(bitmap,cliprect,
code, color,
flipx, flipy,
curx, cury,
screen.priority(), primask[priority], 0);
}
}
}
u32 darius_state::update_screen(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect, int xoffs)
{
screen.priority().fill(0, cliprect);
m_pc080sn->tilemap_update();
// draw bottom layer(always active)
m_pc080sn->tilemap_draw_offset(screen, bitmap, cliprect, 0, TILEMAP_DRAW_OPAQUE, 1, -xoffs, 0);
// draw middle layer
m_pc080sn->tilemap_draw_offset(screen, bitmap, cliprect, 1, 0, 2, -xoffs, 0);
/* Sprites can be under/over the layer below text layer */
draw_sprites(screen, bitmap, cliprect, xoffs, -8);
/* top(text) layer is in fixed position */
m_fg_tilemap->set_scrollx(0, 0 + xoffs);
m_fg_tilemap->set_scrolly(0, -8);
m_fg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
return 0;
}
u32 darius_state::screen_update_left(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect){ return update_screen(screen, bitmap, cliprect, 36 * 8 * 0); }
u32 darius_state::screen_update_middle(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect){ return update_screen(screen, bitmap, cliprect, 36 * 8 * 1); }
u32 darius_state::screen_update_right(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect){ return update_screen(screen, bitmap, cliprect, 36 * 8 * 2); }
|