// license:BSD-3-Clause
// copyright-holders:Nicola Salmoria
#include "emu.h"
#include "includes/ohmygod.h"
/***************************************************************************
Callbacks for the TileMap code
***************************************************************************/
TILE_GET_INFO_MEMBER(ohmygod_state::get_tile_info)
{
uint16_t code = m_videoram[2 * tile_index + 1];
uint16_t attr = m_videoram[2 * tile_index];
SET_TILE_INFO_MEMBER(0,
code,
(attr & 0x0f00) >> 8,
0);
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
void ohmygod_state::video_start()
{
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(ohmygod_state::get_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 64, 64);
}
/***************************************************************************
Memory handlers
***************************************************************************/
WRITE16_MEMBER(ohmygod_state::ohmygod_videoram_w)
{
COMBINE_DATA(&m_videoram[offset]);
m_bg_tilemap->mark_tile_dirty(offset / 2);
}
WRITE16_MEMBER(ohmygod_state::ohmygod_spritebank_w)
{
if (ACCESSING_BITS_8_15)
m_spritebank = data & 0x8000;
}
WRITE16_MEMBER(ohmygod_state::ohmygod_scrollx_w)
{
COMBINE_DATA(&m_scrollx);
m_bg_tilemap->set_scrollx(0, m_scrollx - 0x81ec);
}
WRITE16_MEMBER(ohmygod_state::ohmygod_scrolly_w)
{
COMBINE_DATA(&m_scrolly);
m_bg_tilemap->set_scrolly(0, m_scrolly - 0x81ef);
}
/***************************************************************************
Display refresh
***************************************************************************/
void ohmygod_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect )
{
uint16_t *spriteram = m_spriteram;
int offs;
for (offs = 0; offs < m_spriteram.bytes() / 4; offs += 4)
{
int sx, sy, code, color, flipx;
uint16_t *sr;
sr = m_spritebank ? (spriteram + m_spriteram.bytes() / 4) : spriteram;
code = sr[offs + 3] & 0x0fff;
color = sr[offs + 2] & 0x000f;
sx = sr[offs + 0] - 29;
sy = sr[offs + 1];
if (sy >= 32768)
sy -= 65536;
flipx = sr[offs + 3] & 0x8000;
m_gfxdecode->gfx(1)->transpen(bitmap,cliprect,
code,
color,
flipx,0,
sx,sy,0);
}
}
uint32_t ohmygod_state::screen_update_ohmygod(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
draw_sprites(bitmap, cliprect);
return 0;
}