// license:BSD-3-Clause
// copyright-holders:Nicola Salmoria
/***************************************************************************
video.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "emu.h"
#include "includes/pbaction.h"
WRITE8_MEMBER(pbaction_state::pbaction_videoram_w)
{
m_videoram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset);
}
WRITE8_MEMBER(pbaction_state::pbaction_colorram_w)
{
m_colorram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset);
}
WRITE8_MEMBER(pbaction_state::pbaction_videoram2_w)
{
m_videoram2[offset] = data;
m_fg_tilemap->mark_tile_dirty(offset);
}
WRITE8_MEMBER(pbaction_state::pbaction_colorram2_w)
{
m_colorram2[offset] = data;
m_fg_tilemap->mark_tile_dirty(offset);
}
WRITE8_MEMBER(pbaction_state::pbaction_scroll_w)
{
m_scroll = data - 3;
if (flip_screen())
m_scroll = -m_scroll;
m_bg_tilemap->set_scrollx(0, m_scroll);
m_fg_tilemap->set_scrollx(0, m_scroll);
}
WRITE8_MEMBER(pbaction_state::pbaction_flipscreen_w)
{
flip_screen_set(data & 0x01);
}
TILE_GET_INFO_MEMBER(pbaction_state::get_bg_tile_info)
{
int attr = m_colorram[tile_index];
int code = m_videoram[tile_index] + 0x10 * (attr & 0x70);
int color = attr & 0x07;
int flags = (attr & 0x80) ? TILE_FLIPY : 0;
SET_TILE_INFO_MEMBER(1, code, color, flags);
}
TILE_GET_INFO_MEMBER(pbaction_state::get_fg_tile_info)
{
int attr = m_colorram2[tile_index];
int code = m_videoram2[tile_index] + 0x10 * (attr & 0x30);
int color = attr & 0x0f;
int flags = ((attr & 0x40) ? TILE_FLIPX : 0) | ((attr & 0x80) ? TILE_FLIPY : 0);
SET_TILE_INFO_MEMBER(0, code, color, flags);
}
void pbaction_state::video_start()
{
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(pbaction_state::get_bg_tile_info),this), TILEMAP_SCAN_ROWS, 8, 8, 32, 32);
m_fg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(pbaction_state::get_fg_tile_info),this), TILEMAP_SCAN_ROWS, 8, 8, 32, 32);
m_fg_tilemap->set_transparent_pen(0);
}
void pbaction_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect )
{
uint8_t *spriteram = m_spriteram;
int offs;
for (offs = m_spriteram.bytes() - 4; offs >= 0; offs -= 4)
{
int sx, sy, flipx, flipy;
/* if next sprite is double size, skip this one */
if (offs > 0 && spriteram[offs - 4] & 0x80)
continue;
sx = spriteram[offs + 3];
if (spriteram[offs] & 0x80)
sy = 225 - spriteram[offs + 2];
else
sy = 241 - spriteram[offs + 2];
flipx = spriteram[offs + 1] & 0x40;
flipy = spriteram[offs + 1] & 0x80;
if (flip_screen())
{
if (spriteram[offs] & 0x80)
{
sx = 224 - sx;
sy = 225 - sy;
}
else
{
sx = 240 - sx;
sy = 241 - sy;
}
flipx = !flipx;
flipy = !flipy;
}
m_gfxdecode->gfx((spriteram[offs] & 0x80) ? 3 : 2)->transpen(bitmap,cliprect, /* normal or double size */
spriteram[offs],
spriteram[offs + 1] & 0x0f,
flipx,flipy,
sx + (flip_screen() ? m_scroll : -m_scroll), sy,0);
}
}
uint32_t pbaction_state::screen_update_pbaction(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;
}