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// license:GPL-2.0+
// copyright-holders:Juergen Buchmueller
/***************************************************************************
Meadows S2650 driver
****************************************************************************/
#include "emu.h"
#include "includes/meadows.h"
/* some constants to make life easier */
#define SPR_ADJUST_X -18
#define SPR_ADJUST_Y -14
/*************************************
*
* Tilemap callbacks
*
*************************************/
TILE_GET_INFO_MEMBER(meadows_state::get_tile_info)
{
uint8_t *videoram = m_videoram;
SET_TILE_INFO_MEMBER(0, videoram[tile_index] & 0x7f, 0, 0);
}
/*************************************
*
* Video startup
*
*************************************/
void meadows_state::video_start()
{
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(meadows_state::get_tile_info)), TILEMAP_SCAN_ROWS, 8,8, 32,30);
}
/*************************************
*
* Video RAM write
*
*************************************/
WRITE8_MEMBER(meadows_state::meadows_videoram_w)
{
uint8_t *videoram = m_videoram;
videoram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset);
}
/*************************************
*
* Sprite RAM write
*
*************************************/
WRITE8_MEMBER(meadows_state::meadows_spriteram_w)
{
// m_screen->update_now();
m_screen->update_partial(m_screen->vpos());
m_spriteram[offset] = data;
}
/*************************************
*
* Sprite rendering
*
*************************************/
void meadows_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &clip)
{
uint8_t *spriteram = m_spriteram;
int i;
for (i = 0; i < 4; i++)
{
int x = spriteram[i+0] + SPR_ADJUST_X;
int y = spriteram[i+4] + SPR_ADJUST_Y;
int code = spriteram[i+8] & 0x0f; /* bit #0 .. #3 select sprite */
/* int bank = (spriteram[i+8] >> 4) & 1; bit #4 selects prom ??? */
int bank = i; /* that fixes it for now :-/ */
int flip = spriteram[i+8] >> 5; /* bit #5 flip vertical flag */
m_gfxdecode->gfx(bank + 1)->transpen(bitmap,clip, code, 0, flip, 0, x, y, 0);
}
}
/*************************************
*
* Primary video update
*
*************************************/
uint32_t meadows_state::screen_update_meadows(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
/* draw the background */
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
/* draw the sprites */
if (m_gfxdecode->gfx(1))
draw_sprites(bitmap, cliprect);
return 0;
}
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