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/***************************************************************************
Atari Canyon Bomber video emulation
***************************************************************************/
#include "emu.h"
#include "includes/canyon.h"
WRITE8_MEMBER(canyon_state::canyon_videoram_w)
{
m_videoram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset);
}
TILE_GET_INFO_MEMBER(canyon_state::get_bg_tile_info)
{
UINT8 code = m_videoram[tile_index];
SET_TILE_INFO_MEMBER(0, code & 0x3f, code >> 7, 0);
}
VIDEO_START( canyon )
{
canyon_state *state = machine.driver_data<canyon_state>();
state->m_bg_tilemap = &machine.tilemap().create(tilemap_get_info_delegate(FUNC(canyon_state::get_bg_tile_info),state), TILEMAP_SCAN_ROWS, 8, 8, 32, 32);
}
static void draw_sprites( running_machine &machine, bitmap_ind16 &bitmap, const rectangle &cliprect )
{
canyon_state *state = machine.driver_data<canyon_state>();
int i;
for (i = 0; i < 2; i++)
{
int x = state->m_videoram[0x3d0 + 2 * i + 0x1];
int y = state->m_videoram[0x3d0 + 2 * i + 0x8];
int c = state->m_videoram[0x3d0 + 2 * i + 0x9];
drawgfx_transpen(bitmap, cliprect,
machine.gfx[1],
c >> 3,
i,
!(c & 0x80), 0,
224 - x,
240 - y, 0);
}
}
static void draw_bombs( running_machine &machine, bitmap_ind16 &bitmap, const rectangle &cliprect )
{
canyon_state *state = machine.driver_data<canyon_state>();
int i;
for (i = 0; i < 2; i++)
{
int sx = 254 - state->m_videoram[0x3d0 + 2 * i + 0x5];
int sy = 246 - state->m_videoram[0x3d0 + 2 * i + 0xc];
rectangle rect(sx, sx + 1, sy, sy + 1);
rect &= cliprect;
bitmap.fill(1 + 2 * i, rect);
}
}
SCREEN_UPDATE_IND16( canyon )
{
canyon_state *state = screen.machine().driver_data<canyon_state>();
state->m_bg_tilemap->draw(bitmap, cliprect, 0, 0);
draw_sprites(screen.machine(), bitmap, cliprect);
draw_bombs(screen.machine(), bitmap, cliprect);
/* watchdog is disabled during service mode */
screen.machine().watchdog_enable(!(screen.machine().root_device().ioport("IN2")->read() & 0x10));
return 0;
}
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