// license:GPL-2.0+
// copyright-holders:David Graves, Jarek Burczynski
#include "emu.h"
#include "includes/darius.h"
/***************************************************************************/
TILE_GET_INFO_MEMBER(darius_state::get_fg_tile_info)
{
uint16_t code = (m_fg_ram[tile_index + 0x2000] & 0x7ff);
uint16_t attr = m_fg_ram[tile_index];
SET_TILE_INFO_MEMBER(2,
code,
(attr & 0x7f),
TILE_FLIPYX((attr & 0xc000) >> 14));
}
/***************************************************************************/
void darius_state::video_start()
{
m_gfxdecode->gfx(2)->set_granularity(16);
m_fg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(darius_state::get_fg_tile_info),this),TILEMAP_SCAN_ROWS,8,8,128,64);
m_fg_tilemap->set_transparent_pen(0);
}
/***************************************************************************/
WRITE16_MEMBER(darius_state::darius_fg_layer_w)
{
COMBINE_DATA(&m_fg_ram[offset]);
if (offset < 0x4000)
m_fg_tilemap->mark_tile_dirty((offset & 0x1fff));
}
/***************************************************************************/
void darius_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect, int primask, int x_offs, int y_offs )
{
uint16_t *spriteram = m_spriteram;
int offs, curx, cury;
uint16_t code, data, sx, sy;
uint8_t flipx, flipy, color, priority;
for (offs = m_spriteram.bytes() / 2 - 4; offs >= 0; offs -= 4)
{
code = spriteram[offs + 2] & 0x1fff;
if (code)
{
data = spriteram[offs];
sy = (256 - data) & 0x1ff;
data = spriteram[offs + 1];
sx = data & 0x3ff;
data = spriteram[offs + 2];
flipx = ((data & 0x4000) >> 14);
flipy = ((data & 0x8000) >> 15);
data = spriteram[offs + 3];
priority = (data & 0x80) >> 7; // 0 = low
if (priority != primask)
continue;
color = (data & 0x7f);
curx = sx - x_offs;
cury = sy + y_offs;
if (curx > 900) curx -= 1024;
if (cury > 400) cury -= 512;
m_gfxdecode->gfx(0)->transpen(bitmap,cliprect,
code, color,
flipx, flipy,
curx, cury, 0);
}
}
}
uint32_t darius_state::update_screen(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect, int xoffs)
{
m_pc080sn->tilemap_update();
// draw bottom layer(always active)
m_pc080sn->tilemap_draw_offset(screen, bitmap, cliprect, 0, TILEMAP_DRAW_OPAQUE, 0, -xoffs, 0);
/* Sprites can be under/over the layer below text layer */
draw_sprites(bitmap, cliprect, 0, xoffs, -8); // draw sprites with priority 0 which are under the mid layer
// draw middle layer
m_pc080sn->tilemap_draw_offset(screen, bitmap, cliprect, 1, 0, 0, -xoffs, 0);
draw_sprites(bitmap, cliprect, 1, xoffs, -8); // draw sprites with priority 1 which are over the mid layer
/* top(text) layer is in fixed position */
m_fg_tilemap->set_scrollx(0, 0 + xoffs);
m_fg_tilemap->set_scrolly(0, -8);
m_fg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
return 0;
}
uint32_t darius_state::screen_update_darius_left(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect){ return update_screen(screen, bitmap, cliprect, 36 * 8 * 0); }
uint32_t darius_state::screen_update_darius_middle(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect){ return update_screen(screen, bitmap, cliprect, 36 * 8 * 1); }
uint32_t darius_state::screen_update_darius_right(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect){ return update_screen(screen, bitmap, cliprect, 36 * 8 * 2); }