// license:BSD-3-Clause
// copyright-holders:David Haywood
#include "emu.h"
#include "includes/shadfrce.h"
TILE_GET_INFO_MEMBER(shadfrce_state::get_fgtile_info)
{
/* ---- ---- tttt tttt ---- ---- pppp TTTT */
int tileno, colour;
tileno = (m_fgvideoram[tile_index *2] & 0x00ff) | ((m_fgvideoram[tile_index *2+1] & 0x000f) << 8);
colour = (m_fgvideoram[tile_index *2+1] & 0x00f0) >>4;
SET_TILE_INFO_MEMBER(0,tileno,colour*4,0);
}
WRITE16_MEMBER(shadfrce_state::fgvideoram_w)
{
m_fgvideoram[offset] = data;
m_fgtilemap->mark_tile_dirty(offset/2);
}
TILE_GET_INFO_MEMBER(shadfrce_state::get_bg0tile_info)
{
/* ---- ---- ---- cccc --TT TTTT TTTT TTTT */
int tileno, colour,fyx;
tileno = (m_bg0videoram[tile_index *2+1] & 0x3fff);
colour = m_bg0videoram[tile_index *2] & 0x001f;
if (colour & 0x10) colour ^= 0x30; /* skip hole */
fyx = (m_bg0videoram[tile_index *2] & 0x00c0) >>6;
SET_TILE_INFO_MEMBER(2,tileno,colour,TILE_FLIPYX(fyx));
}
WRITE16_MEMBER(shadfrce_state::bg0videoram_w)
{
m_bg0videoram[offset] = data;
m_bg0tilemap->mark_tile_dirty(offset/2);
}
TILE_GET_INFO_MEMBER(shadfrce_state::get_bg1tile_info)
{
int tileno, colour;
tileno = (m_bg1videoram[tile_index] & 0x0fff);
colour = (m_bg1videoram[tile_index] & 0xf000) >> 12;
SET_TILE_INFO_MEMBER(2,tileno,colour+64,0);
}
WRITE16_MEMBER(shadfrce_state::bg1videoram_w)
{
m_bg1videoram[offset] = data;
m_bg1tilemap->mark_tile_dirty(offset);
}
void shadfrce_state::video_start()
{
m_fgtilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(shadfrce_state::get_fgtile_info)), TILEMAP_SCAN_ROWS, 8, 8, 64, 32);
m_fgtilemap->set_transparent_pen(0);
m_bg0tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(shadfrce_state::get_bg0tile_info)), TILEMAP_SCAN_ROWS, 16, 16, 32, 32);
m_bg0tilemap->set_transparent_pen(0);
m_bg1tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(shadfrce_state::get_bg1tile_info)), TILEMAP_SCAN_ROWS, 16, 16, 32, 32);
m_spvideoram_old = std::make_unique<uint16_t[]>(m_spvideoram.bytes()/2);
save_item(NAME(m_video_enable));
save_item(NAME(m_irqs_enable));
save_item(NAME(m_raster_scanline));
save_item(NAME(m_raster_irq_enable));
save_item(NAME(m_vblank));
save_item(NAME(m_prev_value));
}
WRITE16_MEMBER(shadfrce_state::bg0scrollx_w)
{
m_bg0tilemap->set_scrollx(0, data & 0x1ff );
}
WRITE16_MEMBER(shadfrce_state::bg0scrolly_w)
{
m_bg0tilemap->set_scrolly(0, data & 0x1ff );
}
WRITE16_MEMBER(shadfrce_state::bg1scrollx_w)
{
m_bg1tilemap->set_scrollx(0, data & 0x1ff );
}
WRITE16_MEMBER(shadfrce_state::bg1scrolly_w)
{
m_bg1tilemap->set_scrolly(0, data & 0x1ff );
}
void shadfrce_state::draw_sprites(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect )
{
/* | ---- ---- hhhf Fe-Y | ---- ---- yyyy yyyy | ---- ---- TTTT TTTT | ---- ---- tttt tttt |
| ---- ---- -pCc cccX | ---- ---- xxxx xxxx | ---- ---- ---- ---- | ---- ---- ---- ---- | */
/* h = height
f = flipx
F = flipy
e = enable
Yy = Y Position
Tt = Tile No.
Xx = X Position
Cc = color
P = priority
*/
gfx_element *gfx = m_gfxdecode->gfx(1);
uint16_t *finish = m_spvideoram_old.get();
uint16_t *source = finish + 0x2000/2 - 8;
int hcount;
while( source>=finish )
{
int ypos = 0x100 - (((source[0] & 0x0003) << 8) | (source[1] & 0x00ff));
int xpos = (((source[4] & 0x0001) << 8) | (source[5] & 0x00ff)) + 1;
int tile = ((source[2] & 0x00ff) << 8) | (source[3] & 0x00ff);
int height = (source[0] & 0x00e0) >> 5;
int enable = ((source[0] & 0x0004));
int flipx = ((source[0] & 0x0010) >> 4);
int flipy = ((source[0] & 0x0008) >> 3);
int pal = ((source[4] & 0x003e));
int pri_mask = (source[4] & 0x0040) ? 0x02 : 0x00;
if (pal & 0x20) pal ^= 0x60; /* skip hole */
height++;
if (enable) {
for (hcount=0;hcount<height;hcount++) {
gfx->prio_transpen(bitmap,cliprect,tile+hcount,pal,flipx,flipy,xpos,ypos-hcount*16-16,screen.priority(),pri_mask,0);
gfx->prio_transpen(bitmap,cliprect,tile+hcount,pal,flipx,flipy,xpos-0x200,ypos-hcount*16-16,screen.priority(),pri_mask,0);
gfx->prio_transpen(bitmap,cliprect,tile+hcount,pal,flipx,flipy,xpos,ypos-hcount*16-16+0x200,screen.priority(),pri_mask,0);
gfx->prio_transpen(bitmap,cliprect,tile+hcount,pal,flipx,flipy,xpos-0x200,ypos-hcount*16-16+0x200,screen.priority(),pri_mask,0);
}
}
source-=8;
}
}
uint32_t shadfrce_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
screen.priority().fill(0, cliprect);
if (m_video_enable)
{
m_bg1tilemap->draw(screen, bitmap, cliprect, 0,0);
m_bg0tilemap->draw(screen, bitmap, cliprect, 0,1);
draw_sprites(screen,bitmap,cliprect);
m_fgtilemap->draw(screen, bitmap, cliprect, 0,0);
}
else
{
bitmap.fill(m_palette->black_pen(), cliprect);
}
return 0;
}
WRITE_LINE_MEMBER(shadfrce_state::screen_vblank)
{
// rising edge
if (state)
{
/* looks like sprites are *two* frames ahead */
memcpy(m_spvideoram_old.get(), m_spvideoram, m_spvideoram.bytes());
}
}