// license:BSD-3-Clause
// copyright-holders:Brad Oliver
/***************************************************************************
video.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "emu.h"
#include "includes/arkanoid.h"
WRITE8_MEMBER(arkanoid_state::arkanoid_videoram_w)
{
m_videoram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset / 2);
}
WRITE8_MEMBER(arkanoid_state::arkanoid_d008_w)
{
int bank;
/* bits 0 and 1 flip X and Y, I don't know which is which */
flip_screen_x_set(data & 0x01);
flip_screen_y_set(data & 0x02);
/* bit 2 selects the input paddle */
m_paddle_select = data & 0x04;
/* bit 3 is coin lockout (but not the service coin) */
machine().bookkeeping().coin_lockout_w(0, !(data & 0x08));
machine().bookkeeping().coin_lockout_w(1, !(data & 0x08));
/* bit 4 is unknown */
/* bits 5 and 6 control gfx bank and palette bank. They are used together */
/* so I don't know which is which. */
bank = (data & 0x20) >> 5;
if (m_gfxbank != bank)
{
m_gfxbank = bank;
m_bg_tilemap->mark_all_dirty();
}
bank = (data & 0x40) >> 6;
if (m_palettebank != bank)
{
m_palettebank = bank;
m_bg_tilemap->mark_all_dirty();
}
// bit 7 resets the MCU and semaphore flipflops
// This bit is flipped early in bootup just prior to accessing the MCU for the first time.
if (m_mcuintf.found()) // Bootlegs don't have the MCU but still set this bit
m_mcuintf->reset_w(BIT(data, 7) ? CLEAR_LINE : ASSERT_LINE);
}
WRITE8_MEMBER(arkanoid_state::brixian_d008_w)
{
int bank;
/* bits 0 and 1 flip X and Y, I don't know which is which */
flip_screen_x_set(data & 0x01);
flip_screen_y_set(data & 0x02);
/* bit 2 selects the input paddle */
/* - not relevant to brixian */
/* bit 3 is coin lockout (but not the service coin) */
/* - not here, means you can only play 1 game */
/* bit 4 is unknown */
/* bits 5 and 6 control gfx bank and palette bank. They are used together */
/* so I don't know which is which. */
bank = (data & 0x20) >> 5;
if (m_gfxbank != bank)
{
m_gfxbank = bank;
m_bg_tilemap->mark_all_dirty();
}
bank = (data & 0x40) >> 6;
if (m_palettebank != bank)
{
m_palettebank = bank;
m_bg_tilemap->mark_all_dirty();
}
/* bit 7 is MCU reset on Arkanoid */
/* - does it reset the Brixian MCU too? */
}
/* different hook-up, everything except for bits 0-1 and 7 aren't tested afaik. */
WRITE8_MEMBER(arkanoid_state::tetrsark_d008_w)
{
int bank;
/* bits 0 and 1 flip X and Y, I don't know which is which */
flip_screen_x_set(data & 0x01);
flip_screen_y_set(data & 0x02);
/* bit 2 selects the input paddle? */
m_paddle_select = data & 0x04;
/* bit 3-4 is unknown? */
/* bits 5 and 6 control gfx bank and palette bank. They are used together */
/* so I don't know which is which.? */
bank = (data & 0x20) >> 5;
if (m_gfxbank != bank)
{
m_gfxbank = bank;
m_bg_tilemap->mark_all_dirty();
}
bank = (data & 0x40) >> 6;
if (m_palettebank != bank)
{
m_palettebank = bank;
m_bg_tilemap->mark_all_dirty();
}
/* bit 7 is coin lockout (but not the service coin) */
machine().bookkeeping().coin_lockout_w(0, !(data & 0x80));
machine().bookkeeping().coin_lockout_w(1, !(data & 0x80));
}
WRITE8_MEMBER(arkanoid_state::hexa_d008_w)
{
/* bit 0 = flipx (or y?) */
flip_screen_x_set(data & 0x01);
flip_screen_y_set(data & 0x02);
/* bit 2 - 3 unknown */
/* bit 4 could be the ROM bank selector for 8000-bfff (not sure) */
membank("bank1")->set_entry(((data & 0x10) >> 4));
/* bit 5 = gfx bank */
if (m_gfxbank != ((data & 0x20) >> 5))
{
m_gfxbank = (data & 0x20) >> 5;
m_bg_tilemap->mark_all_dirty();
}
/* bit 6 - 7 unknown */
}
TILE_GET_INFO_MEMBER(arkanoid_state::get_bg_tile_info)
{
int offs = tile_index * 2;
int code = m_videoram[offs + 1] + ((m_videoram[offs] & 0x07) << 8) + 2048 * m_gfxbank;
int color = ((m_videoram[offs] & 0xf8) >> 3) + 32 * m_palettebank;
SET_TILE_INFO_MEMBER(0, code, color, 0);
}
void arkanoid_state::video_start()
{
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(arkanoid_state::get_bg_tile_info),this), TILEMAP_SCAN_ROWS, 8, 8, 32, 32);
}
void arkanoid_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect )
{
int offs;
for (offs = 0; offs < m_spriteram.bytes(); offs += 4)
{
int sx, sy, code;
sx = m_spriteram[offs];
sy = 248 - m_spriteram[offs + 1];
if (flip_screen_x())
sx = 248 - sx;
if (flip_screen_y())
sy = 248 - sy;
code = m_spriteram[offs + 3] + ((m_spriteram[offs + 2] & 0x03) << 8) + 1024 * m_gfxbank;
m_gfxdecode->gfx(0)->transpen(bitmap,cliprect,
2 * code,
((m_spriteram[offs + 2] & 0xf8) >> 3) + 32 * m_palettebank,
flip_screen_x(),flip_screen_y(),
sx,sy + (flip_screen_y() ? 8 : -8),0);
m_gfxdecode->gfx(0)->transpen(bitmap,cliprect,
2 * code + 1,
((m_spriteram[offs + 2] & 0xf8) >> 3) + 32 * m_palettebank,
flip_screen_x(),flip_screen_y(),
sx,sy,0);
}
}
uint32_t arkanoid_state::screen_update_arkanoid(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
draw_sprites(bitmap, cliprect);
return 0;
}
uint32_t arkanoid_state::screen_update_hexa(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
return 0;
}