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// license:BSD-3-Clause
// copyright-holders:Stefan Jokisch
/***************************************************************************
Atari Orbit video emulation
***************************************************************************/
#include "emu.h"
#include "includes/orbit.h"
WRITE8_MEMBER(orbit_state::playfield_w)
{
m_playfield_ram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset);
}
TILE_GET_INFO_MEMBER(orbit_state::get_tile_info)
{
uint8_t code = m_playfield_ram[tile_index];
int flags = 0;
if (BIT(code, 6))
flags |= TILE_FLIPX;
if (m_flip_screen)
flags |= TILE_FLIPY;
SET_TILE_INFO_MEMBER(3, code & 0x3f, 0, flags);
}
void orbit_state::video_start()
{
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(orbit_state::get_tile_info),this), TILEMAP_SCAN_ROWS, 16, 16, 32, 30);
}
void orbit_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect)
{
const uint8_t* p = m_sprite_ram;
for (int i = 0; i < 16; i++)
{
int code = *p++;
int vpos = *p++;
int hpos = *p++;
int flag = *p++;
int layout =
((flag & 0xc0) == 0x80) ? 1 :
((flag & 0xc0) == 0xc0) ? 2 : 0;
int flip_x = BIT(code, 6);
int flip_y = BIT(code, 7);
int zoom_x = 0x10000;
int zoom_y = 0x10000;
code &= 0x3f;
if (flag & 1)
code |= 0x40;
if (flag & 2)
zoom_x *= 2;
vpos = 240 - vpos;
hpos <<= 1;
vpos <<= 1;
m_gfxdecode->gfx(layout)->zoom_transpen(bitmap,cliprect, code, 0, flip_x, flip_y,
hpos, vpos, zoom_x, zoom_y, 0);
}
}
uint32_t orbit_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_flip_screen = ioport("DSW2")->read() & 8;
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
draw_sprites(bitmap, cliprect);
return 0;
}
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