// license:BSD-3-Clause
// copyright-holders:Stefan Jokisch
/***************************************************************************
Atari Triple Hunt video emulation
***************************************************************************/
#include "emu.h"
#include "includes/triplhnt.h"
TILE_GET_INFO_MEMBER(triplhnt_state::get_tile_info)
{
int code = m_playfield_ram[tile_index] & 0x3f;
SET_TILE_INFO_MEMBER(2, code, code == 0x3f ? 1 : 0, 0);
}
void triplhnt_state::video_start()
{
m_screen->register_screen_bitmap(m_helper);
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(triplhnt_state::get_tile_info),this), TILEMAP_SCAN_ROWS, 16, 16, 16, 16);
m_hit_timer = timer_alloc(TIMER_HIT);
save_item(NAME(m_cmos));
save_item(NAME(m_da_latch));
save_item(NAME(m_cmos_latch));
save_item(NAME(m_hit_code));
save_item(NAME(m_sprite_zoom));
save_item(NAME(m_sprite_bank));
}
void triplhnt_state::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
switch (id)
{
case TIMER_HIT:
set_collision(param);
break;
default:
assert_always(false, "Unknown id in triplhnt_state::device_timer");
}
}
void triplhnt_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect)
{
int hit_line = 999;
int hit_code = 999;
for (int i = 0; i < 16; i++)
{
rectangle rect;
int j = (m_orga_ram[i] & 15) ^ 15;
/* software sorts sprites by x and stores order in orga RAM */
int hpos = m_hpos_ram[j] ^ 255;
int vpos = m_vpos_ram[j] ^ 255;
int code = m_code_ram[j] ^ 255;
if (hpos == 255)
continue;
/* sprite placement might be wrong */
if (m_sprite_zoom)
{
rect.set(hpos - 16, hpos - 16 + 63, 196 - vpos, 196 - vpos + 63);
}
else
{
rect.set(hpos - 16, hpos - 16 + 31, 224 - vpos, 224 - vpos + 31);
}
/* render sprite to auxiliary bitmap */
m_gfxdecode->gfx(m_sprite_zoom)->opaque(m_helper,cliprect,
2 * code + m_sprite_bank, 0, code & 8, 0,
rect.min_x, rect.min_y);
rect &= cliprect;
/* check for collisions and copy sprite */
{
int x;
int y;
for (x = rect.min_x; x <= rect.max_x; x++)
{
for (y = rect.min_y; y <= rect.max_y; y++)
{
pen_t a = m_helper.pix16(y, x);
pen_t b = bitmap.pix16(y, x);
if (a == 2 && b == 7)
{
hit_code = j;
hit_line = y;
}
if (a != 1)
bitmap.pix16(y, x) = a;
}
}
}
}
if (hit_line != 999 && hit_code != 999)
m_hit_timer->adjust(m_screen->time_until_pos(hit_line), hit_code);
}
uint32_t triplhnt_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_bg_tilemap->mark_all_dirty();
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
draw_sprites(bitmap, cliprect);
address_space &space = machine().dummy_space();
m_discrete->write(space, TRIPLHNT_BEAR_ROAR_DATA, m_playfield_ram[0xfa] & 15);
m_discrete->write(space, TRIPLHNT_SHOT_DATA, m_playfield_ram[0xfc] & 15);
return 0;
}