// license:BSD-3-Clause
// copyright-holders:Nicola Salmoria
#include "emu.h"
#include "includes/crshrace.h"
/***************************************************************************
Callbacks for the TileMap code
***************************************************************************/
TILE_GET_INFO_MEMBER(crshrace_state::get_tile_info1)
{
int code = m_videoram1[tile_index];
SET_TILE_INFO_MEMBER(1, (code & 0xfff) + (m_roz_bank << 12), code >> 12, 0);
}
TILE_GET_INFO_MEMBER(crshrace_state::get_tile_info2)
{
int code = m_videoram2[tile_index];
SET_TILE_INFO_MEMBER(0, code, 0, 0);
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
uint32_t crshrace_state::crshrace_tile_callback( uint32_t code )
{
return m_spriteram2->buffer()[code&0x7fff];
}
void crshrace_state::video_start()
{
m_tilemap1 = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(crshrace_state::get_tile_info1)), TILEMAP_SCAN_ROWS, 16, 16, 64, 64);
m_tilemap2 = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(crshrace_state::get_tile_info2)), TILEMAP_SCAN_ROWS, 8, 8, 64, 64);
m_tilemap1->set_transparent_pen(0x0f);
m_tilemap2->set_transparent_pen(0xff);
}
/***************************************************************************
Memory handlers
***************************************************************************/
WRITE16_MEMBER(crshrace_state::crshrace_videoram1_w)
{
COMBINE_DATA(&m_videoram1[offset]);
m_tilemap1->mark_tile_dirty(offset);
}
WRITE16_MEMBER(crshrace_state::crshrace_videoram2_w)
{
COMBINE_DATA(&m_videoram2[offset]);
m_tilemap2->mark_tile_dirty(offset);
}
WRITE16_MEMBER(crshrace_state::crshrace_roz_bank_w)
{
if (ACCESSING_BITS_0_7)
{
if (m_roz_bank != (data & 0xff))
{
m_roz_bank = data & 0xff;
m_tilemap1->mark_all_dirty();
}
}
}
WRITE16_MEMBER(crshrace_state::crshrace_gfxctrl_w)
{
if (ACCESSING_BITS_0_7)
{
m_gfxctrl = data & 0xdf;
m_flipscreen = data & 0x20;
}
}
/***************************************************************************
Display refresh
***************************************************************************/
void crshrace_state::draw_bg( screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect )
{
m_tilemap2->draw(screen, bitmap, cliprect, 0, 0);
}
void crshrace_state::draw_fg(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_k053936->zoom_draw(screen, bitmap, cliprect, m_tilemap1, 0, 0, 1);
}
uint32_t crshrace_state::screen_update_crshrace(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
if (m_gfxctrl & 0x04) /* display disable? */
{
bitmap.fill(m_palette->black_pen(), cliprect);
return 0;
}
bitmap.fill(0x1ff, cliprect);
switch (m_gfxctrl & 0xfb)
{
case 0x00: /* high score screen */
m_spr->draw_sprites(m_spriteram->buffer(), 0x2000, screen, bitmap, cliprect);
draw_bg(screen, bitmap, cliprect);
draw_fg(screen, bitmap, cliprect);
break;
case 0x01:
case 0x02:
draw_bg(screen, bitmap, cliprect);
draw_fg(screen, bitmap, cliprect);
m_spr->draw_sprites(m_spriteram->buffer(), 0x2000, screen, bitmap, cliprect);
break;
default:
popmessage("gfxctrl = %02x", m_gfxctrl);
break;
}
return 0;
}