1 // license:BSD-3-Clause
2 // copyright-holders:Nicola Salmoria
3 #include "emu.h"
4 #include "includes/shisen.h"
5
videoram_w(offs_t offset,uint8_t data)6 void shisen_state::videoram_w(offs_t offset, uint8_t data)
7 {
8 m_videoram[offset] = data;
9 m_bg_tilemap->mark_tile_dirty(offset / 2);
10 }
11
bankswitch_w(uint8_t data)12 void shisen_state::bankswitch_w(uint8_t data)
13 {
14 if (data & 0xc0) logerror("bank switch %02x\n",data);
15
16 /* bits 0-2 select ROM bank */
17 membank("bank1")->set_entry(data & 0x07);
18
19 /* bits 3-5 select gfx bank */
20 int bank = (data & 0x38) >> 3;
21
22 if (m_gfxbank != bank)
23 {
24 m_gfxbank = bank;
25 machine().tilemap().mark_all_dirty();
26 }
27
28 /* bits 6-7 unknown */
29 }
30
paletteram_w(offs_t offset,uint8_t data)31 void shisen_state::paletteram_w(offs_t offset, uint8_t data)
32 {
33 m_paletteram[offset] = data;
34
35 offset &= 0xff;
36
37 m_palette->set_pen_color(offset, pal5bit(m_paletteram[offset + 0x000]), pal5bit(m_paletteram[offset + 0x100]), pal5bit(m_paletteram[offset + 0x200]));
38 }
39
TILE_GET_INFO_MEMBER(shisen_state::get_bg_tile_info)40 TILE_GET_INFO_MEMBER(shisen_state::get_bg_tile_info)
41 {
42 int offs = tile_index * 2;
43 int code = m_videoram[offs] + ((m_videoram[offs + 1] & 0x0f) << 8) + (m_gfxbank << 12);
44 int color = (m_videoram[offs + 1] & 0xf0) >> 4;
45
46 tileinfo.set(0, code, color, 0);
47 }
48
video_start()49 void shisen_state::video_start()
50 {
51 m_bg_tilemap = &machine().tilemap().create(
52 *m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(shisen_state::get_bg_tile_info)), TILEMAP_SCAN_ROWS,
53 8, 8, 64, 32);
54
55 membank("bank1")->configure_entries(0, 8, memregion("maincpu")->base() + 0x10000, 0x4000);
56
57 save_item(NAME(m_gfxbank));
58 }
59
screen_update(screen_device & screen,bitmap_ind16 & bitmap,const rectangle & cliprect)60 uint32_t shisen_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
61 {
62 // on Irem boards, screen flip is handled in both hardware and software.
63 // this game doesn't have cocktail mode so if there's software control we don't
64 // know where it is mapped.
65 flip_screen_set(~ioport("DSW2")->read() & 1);
66
67
68 m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
69 return 0;
70 }
71