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// license:BSD-3-Clause
// copyright-holders:Mike Balfour
/***************************************************************************
Atari Canyon Bomber video emulation
***************************************************************************/
#include "emu.h"
#include "includes/canyon.h"
void canyon_state::canyon_videoram_w(offs_t offset, uint8_t data)
{
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;
}
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