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// license:GPL-2.0+
// copyright-holders:Juergen Buchmueller
/***************************************************************************
* Microtan 65
*
* video hardware
*
* Juergen Buchmueller <pullmoll@t-online.de>, Jul 2000
*
* Thanks go to Geoff Macdonald <mail@geoff.org.uk>
* for his site http://www.geoff.org.uk/microtan/index.htm
* and to Fabrice Frances <frances@ensica.fr>
* for his site http://oric.free.fr/microtan.html
*
***************************************************************************/
#include "emu.h"
#include "includes/microtan.h"
void microtan_state::videoram_w(offs_t offset, uint8_t data)
{
if ((m_videoram[offset] != data) || (m_chunky_buffer[offset] != m_chunky_graphics))
{
m_videoram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset);
m_chunky_buffer[offset] = m_chunky_graphics;
}
}
TILE_GET_INFO_MEMBER(microtan_state::get_bg_tile_info)
{
int gfxn = m_chunky_buffer[tile_index];
int code = m_videoram[tile_index];
tileinfo.set(gfxn, code, 0, 0);
}
void microtan_state::video_start()
{
/* randomize video memory contents */
for (uint16_t addr = 0; addr < m_videoram.bytes(); addr++)
m_videoram[addr] = machine().rand() & 0xff;
m_bg_tilemap = &machine().tilemap().create(*
m_gfxdecode,
tilemap_get_info_delegate(*this, FUNC(microtan_state::get_bg_tile_info)),
TILEMAP_SCAN_ROWS, 8, 16, 32, 16);
m_chunky_buffer = std::make_unique<uint8_t[]>(0x200);
memset(m_chunky_buffer.get(), 0, 0x200);
m_chunky_graphics = 0;
save_pointer(NAME(m_chunky_buffer), 0x200);
save_item(NAME(m_chunky_graphics));
}
uint32_t microtan_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
return 0;
}
void mt6809_state::video_start()
{
}
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