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// license:BSD-3-Clause
// copyright-holders:Bryan McPhail
/***************************************************************************
Prehistoric Isle video routines
Emulation by Bryan McPhail, mish@tendril.co.uk
***************************************************************************/
#include "emu.h"
#include "includes/prehisle.h"
#include "screen.h"
WRITE16_MEMBER(prehisle_state::fg_vram_w)
{
COMBINE_DATA(&m_fg_vram[offset]);
m_fg_tilemap->mark_tile_dirty(offset);
}
WRITE16_MEMBER(prehisle_state::tx_vram_w)
{
COMBINE_DATA(&m_tx_vram[offset]);
m_tx_tilemap->mark_tile_dirty(offset);
}
READ16_MEMBER(prehisle_state::control_r)
{
switch (offset)
{
case 0x08: return ioport("P2")->read(); // Player 2
case 0x10: return ioport("COIN")->read(); // Coins, Tilt, Service
case 0x20: return ioport("P1")->read() ^ m_invert_controls; // Player 1
case 0x21: return ioport("DSW0")->read(); // DIPs
case 0x22: return ioport("DSW1")->read(); // DIPs + VBLANK
default: return 0;
}
}
WRITE16_MEMBER(prehisle_state::control_w)
{
int scroll = 0;
COMBINE_DATA(&scroll);
switch (offset)
{
case 0x00: m_fg_tilemap->set_scrolly(0, scroll); break;
case 0x08: m_fg_tilemap->set_scrollx(0, scroll); break;
case 0x10: m_bg_tilemap->set_scrolly(0, scroll); break;
case 0x18: m_bg_tilemap->set_scrollx(0, scroll); break;
case 0x23: m_invert_controls = data ? 0x00ff : 0x0000; break;
case 0x28: machine().bookkeeping().coin_counter_w(0, data & 1); break;
case 0x29: machine().bookkeeping().coin_counter_w(1, data & 1); break;
case 0x30: flip_screen_set(data & 0x01); break;
}
}
/* tile layout
0 xxxx.... color
0 ....x... flip x
0 .....xxx gfx code high bits
1 xxxxxxxx gfx code low bits
*/
TILE_GET_INFO_MEMBER(prehisle_state::get_bg_tile_info)
{
int const offs = tile_index * 2;
int const attr = m_tilemap_rom[offs + 1] + (m_tilemap_rom[offs] << 8);
int const code = attr & 0x7ff;
int const color = attr >> 12;
int const flags = (attr & 0x800) ? TILE_FLIPX : 0;
SET_TILE_INFO_MEMBER(1, code, color, flags);
}
/* tile layout
0 xxxx.... ........ color
0 ....x... ........ flip y
0 .....xxx xxxxxxxx gfx code
*/
TILE_GET_INFO_MEMBER(prehisle_state::get_fg_tile_info)
{
int const attr = m_fg_vram[tile_index];
int const code = attr & 0x7ff;
int const color = attr >> 12;
int const flags = (attr & 0x800) ? TILE_FLIPY : 0;
SET_TILE_INFO_MEMBER(2, code, color, flags);
}
/* tile layout
0 xxxx.... ........ color
0 ....xxxx xxxxxxxx gfx code
*/
TILE_GET_INFO_MEMBER(prehisle_state::get_tx_tile_info)
{
int const attr = m_tx_vram[tile_index];
int const code = attr & 0xfff;
int const color = attr >> 12;
SET_TILE_INFO_MEMBER(0, code, color, 0);
}
void prehisle_state::video_start()
{
// ROM-based background layer
m_bg_tilemap = &machine().tilemap().create(
*m_gfxdecode,
tilemap_get_info_delegate(FUNC(prehisle_state::get_bg_tile_info), this),
TILEMAP_SCAN_COLS, // scan order
16, 16, // tile size
1024, 32); // tilemap size
// RAM-based foreground layer (overlays most sprites)
m_fg_tilemap = &machine().tilemap().create(
*m_gfxdecode,
tilemap_get_info_delegate(FUNC(prehisle_state::get_fg_tile_info), this),
TILEMAP_SCAN_COLS, // scan order
16, 16, // tile size
256, 32); // tilemap size
m_fg_tilemap->set_transparent_pen(15);
// text layer
m_tx_tilemap = &machine().tilemap().create(
*m_gfxdecode,
tilemap_get_info_delegate(FUNC(prehisle_state::get_tx_tile_info), this),
TILEMAP_SCAN_ROWS, // scan order
8, 8, // tile size
32, 32); // tilemap size
m_tx_tilemap->set_transparent_pen(15);
/* register for saving */
save_item(NAME(m_invert_controls));
}
/* sprite layout
0 .......x xxxxxxxx y, other bits unused?
1 .......x xxxxxxxx x, other bits unused?
2 x....... ........ flip y
2 .x...... ........ flip x
2 ..x..... ........ ?
2 ...xxxxx xxxxxxxx gfx code
3 xxxx.... ........ color+priority, other bits unknown
*/
void prehisle_state::draw_sprites(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
uint16_t const *const spriteram16 = m_spriteram;
for (int offs = 1024 - 4; offs >= 0; offs -= 4)
{
int const attr = spriteram16[offs + 2];
int const code = attr & 0x1fff;
int const color = spriteram16[offs + 3] >> 12;
int const priority = (color < 0x4) ? 0 : GFX_PMASK_1; // correct?
bool flipx = attr & 0x4000;
bool flipy = attr & 0x8000;
int sx = spriteram16[offs + 1] & 0x1ff;
int sy = spriteram16[offs] & 0x1ff;
// coordinates are 9-bit signed
if (sx & 0x100) sx = -0x100 + (sx & 0xff);
if (sy & 0x100) sy = -0x100 + (sy & 0xff);
if (flip_screen())
{
sx = 240 - sx;
sy = 240 - sy;
flipx = !flipx;
flipy = !flipy;
}
m_gfxdecode->gfx(3)->prio_transpen(
bitmap, cliprect,
code, color,
flipx, flipy,
sx, sy,
screen.priority(), priority,
15); // transparent pen
}
}
uint32_t prehisle_state::screen_update_prehisle(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
screen.priority().fill(0, cliprect);
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
m_fg_tilemap->draw(screen, bitmap, cliprect, 0, 1);
draw_sprites(screen, bitmap, cliprect);
m_tx_tilemap->draw(screen, bitmap, cliprect, 0);
return 0;
}
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