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// license:BSD-3-Clause
// copyright-holders:Nicola Salmoria
/***************************************************************************
video.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "emu.h"
#include "includes/commando.h"
WRITE8_MEMBER(commando_state::commando_videoram_w)
{
m_videoram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset);
}
WRITE8_MEMBER(commando_state::commando_colorram_w)
{
m_colorram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset);
}
WRITE8_MEMBER(commando_state::commando_videoram2_w)
{
m_videoram2[offset] = data;
m_fg_tilemap->mark_tile_dirty(offset);
}
WRITE8_MEMBER(commando_state::commando_colorram2_w)
{
m_colorram2[offset] = data;
m_fg_tilemap->mark_tile_dirty(offset);
}
WRITE8_MEMBER(commando_state::commando_scrollx_w)
{
m_scroll_x[offset] = data;
m_bg_tilemap->set_scrollx(0, m_scroll_x[0] | (m_scroll_x[1] << 8));
}
WRITE8_MEMBER(commando_state::commando_scrolly_w)
{
m_scroll_y[offset] = data;
m_bg_tilemap->set_scrolly(0, m_scroll_y[0] | (m_scroll_y[1] << 8));
}
WRITE8_MEMBER(commando_state::commando_c804_w)
{
// bits 0 and 1 are coin counters
machine().bookkeeping().coin_counter_w(0, data & 0x01);
machine().bookkeeping().coin_counter_w(1, data & 0x02);
// bit 4 resets the sound CPU
m_audiocpu->set_input_line(INPUT_LINE_RESET, (data & 0x10) ? ASSERT_LINE : CLEAR_LINE);
// bit 7 flips screen
flip_screen_set(data & 0x80);
}
TILE_GET_INFO_MEMBER(commando_state::get_bg_tile_info)
{
int attr = m_colorram[tile_index];
int code = m_videoram[tile_index] + ((attr & 0xc0) << 2);
int color = attr & 0x0f;
int flags = TILE_FLIPYX((attr & 0x30) >> 4);
SET_TILE_INFO_MEMBER(1, code, color, flags);
}
TILE_GET_INFO_MEMBER(commando_state::get_fg_tile_info)
{
int attr = m_colorram2[tile_index];
int code = m_videoram2[tile_index] + ((attr & 0xc0) << 2);
int color = attr & 0x0f;
int flags = TILE_FLIPYX((attr & 0x30) >> 4);
SET_TILE_INFO_MEMBER(0, code, color, flags);
}
void commando_state::video_start()
{
m_bg_tilemap = &machine().tilemap().create(m_gfxdecode, tilemap_get_info_delegate(FUNC(commando_state::get_bg_tile_info),this), TILEMAP_SCAN_COLS, 16, 16, 32, 32);
m_fg_tilemap = &machine().tilemap().create(m_gfxdecode, tilemap_get_info_delegate(FUNC(commando_state::get_fg_tile_info),this), TILEMAP_SCAN_ROWS, 8, 8, 32, 32);
m_fg_tilemap->set_transparent_pen(3);
}
void commando_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect )
{
UINT8 *buffered_spriteram = m_spriteram->buffer();
int offs;
for (offs = m_spriteram->bytes() - 4; offs >= 0; offs -= 4)
{
// bit 1 of attr is not used
int attr = buffered_spriteram[offs + 1];
int bank = (attr & 0xc0) >> 6;
int code = buffered_spriteram[offs] + 256 * bank;
int color = (attr & 0x30) >> 4;
int flipx = attr & 0x04;
int flipy = attr & 0x08;
int sx = buffered_spriteram[offs + 3] - ((attr & 0x01) << 8);
int sy = buffered_spriteram[offs + 2];
if (flip_screen())
{
sx = 240 - sx;
sy = 240 - sy;
flipx = !flipx;
flipy = !flipy;
}
if (bank < 3)
m_gfxdecode->gfx(2)->transpen(bitmap,cliprect, code, color, flipx, flipy, sx, sy, 15);
}
}
UINT32 commando_state::screen_update_commando(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
draw_sprites(bitmap, cliprect);
m_fg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
return 0;
}
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