// license:BSD-3-Clause
// copyright-holders:David Haywood, Roberto Fresca
#include "emu.h"
#include "includes/sderby.h"
/* BG Layer */
TILE_GET_INFO_MEMBER(sderby_state::get_sderby_tile_info)
{
int tileno,colour;
tileno = m_videoram[tile_index*2];
colour = m_videoram[tile_index*2+1] & 0x0f;
SET_TILE_INFO_MEMBER(1,tileno,colour,0);
}
WRITE16_MEMBER(sderby_state::sderby_videoram_w)
{
COMBINE_DATA(&m_videoram[offset]);
m_tilemap->mark_tile_dirty(offset/2);
}
/* MD Layer */
TILE_GET_INFO_MEMBER(sderby_state::get_sderby_md_tile_info)
{
int tileno,colour;
tileno = m_md_videoram[tile_index*2];
colour = m_md_videoram[tile_index*2+1] & 0x0f;
SET_TILE_INFO_MEMBER(1,tileno,colour+16,0);
}
WRITE16_MEMBER(sderby_state::sderby_md_videoram_w)
{
COMBINE_DATA(&m_md_videoram[offset]);
m_md_tilemap->mark_tile_dirty(offset/2);
}
/* FG Layer */
TILE_GET_INFO_MEMBER(sderby_state::get_sderby_fg_tile_info)
{
int tileno,colour;
tileno = m_fg_videoram[tile_index*2];
colour = m_fg_videoram[tile_index*2+1] & 0x0f;
SET_TILE_INFO_MEMBER(0,tileno,colour+32,0);
}
WRITE16_MEMBER(sderby_state::sderby_fg_videoram_w)
{
COMBINE_DATA(&m_fg_videoram[offset]);
m_fg_tilemap->mark_tile_dirty(offset/2);
}
void sderby_state::draw_sprites(bitmap_ind16 &bitmap,const rectangle &cliprect,int codeshift)
{
uint16_t *spriteram16 = m_spriteram;
int offs;
int height = m_gfxdecode->gfx(0)->height();
int colordiv = m_gfxdecode->gfx(0)->granularity() / 16;
for (offs = 4;offs < m_spriteram.bytes()/2;offs += 4)
{
int sx,sy,code,color,flipx;
sy = spriteram16[offs+3-4]; /* -4? what the... ??? */
if (sy == 0x2000) return; /* end of list marker */
flipx = sy & 0x4000;
sx = (spriteram16[offs+1] & 0x01ff) - 16-7;
sy = (256-8-height - sy) & 0xff;
code = spriteram16[offs+2] >> codeshift;
color = (spriteram16[offs+1] & 0x3e00) >> 9;
m_gfxdecode->gfx(1)->transpen(bitmap,cliprect,
code,
color/colordiv+48,
flipx,0,
sx,sy,0);
}
}
void sderby_state::video_start()
{
m_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(sderby_state::get_sderby_tile_info)), TILEMAP_SCAN_ROWS, 16, 16, 32, 32);
m_md_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(sderby_state::get_sderby_md_tile_info)), TILEMAP_SCAN_ROWS, 16, 16, 32, 32);
m_md_tilemap->set_transparent_pen(0);
m_fg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(sderby_state::get_sderby_fg_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 64, 32);
m_fg_tilemap->set_transparent_pen(0);
}
uint32_t sderby_state::screen_update_sderby(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_tilemap->draw(screen, bitmap, cliprect, 0,0);
draw_sprites(bitmap,cliprect,0);
m_md_tilemap->draw(screen, bitmap, cliprect, 0,0);
m_fg_tilemap->draw(screen, bitmap, cliprect, 0,0);
return 0;
}
uint32_t sderby_state::screen_update_pmroulet(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_tilemap->draw(screen, bitmap, cliprect, 0,0);
m_md_tilemap->draw(screen, bitmap, cliprect, 0,0);
draw_sprites(bitmap,cliprect,0);
m_fg_tilemap->draw(screen, bitmap, cliprect, 0,0);
return 0;
}
WRITE16_MEMBER(sderby_state::sderby_scroll_w)
{
data = COMBINE_DATA(&m_scroll[offset]);
switch (offset)
{
case 0: m_fg_tilemap->set_scrollx(0,data+2);break;
case 1: m_fg_tilemap->set_scrolly(0,data-8);break;
case 2: m_md_tilemap->set_scrollx(0,data+4);break;
case 3: m_md_tilemap->set_scrolly(0,data-8);break;
case 4: m_tilemap->set_scrollx(0,data+6); break;
case 5: m_tilemap->set_scrolly(0,data-8); break;
}
}