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// license:BSD-3-Clause
// copyright-holders:Ernesto Corvi
#include "emu.h"
#include "includes/jailbrek.h"
void jailbrek_state::jailbrek_palette(palette_device &palette) const
{
const uint8_t *color_prom = memregion("proms")->base();
// create a lookup table for the palette
for (int i = 0; i < 0x20; i++)
{
int const r = pal4bit(color_prom[i + 0x00] >> 0);
int const g = pal4bit(color_prom[i + 0x00] >> 4);
int const b = pal4bit(color_prom[i + 0x20] >> 0);
palette.set_indirect_color(i, rgb_t(r, g, b));
}
// color_prom now points to the beginning of the lookup table
color_prom += 0x40;
for (int i = 0; i < 0x100; i++)
{
uint8_t const ctabentry = (color_prom[i] & 0x0f) | 0x10;
palette.set_pen_indirect(i, ctabentry);
}
for (int i = 0x100; i < 0x200; i++)
{
uint8_t const ctabentry = color_prom[i] & 0x0f;
palette.set_pen_indirect(i, ctabentry);
}
}
WRITE8_MEMBER(jailbrek_state::videoram_w)
{
m_videoram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset);
}
WRITE8_MEMBER(jailbrek_state::colorram_w)
{
m_colorram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset);
}
TILE_GET_INFO_MEMBER(jailbrek_state::get_bg_tile_info)
{
int attr = m_colorram[tile_index];
int code = m_videoram[tile_index] + ((attr & 0xc0) << 2);
int color = attr & 0x0f;
SET_TILE_INFO_MEMBER(0, code, color, 0);
}
void jailbrek_state::video_start()
{
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(jailbrek_state::get_bg_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 64, 32);
}
void jailbrek_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect )
{
uint8_t *spriteram = m_spriteram;
int i;
for (i = 0; i < m_spriteram.bytes(); i += 4)
{
int attr = spriteram[i + 1]; // attributes = ?tyxcccc
int code = spriteram[i] + ((attr & 0x40) << 2);
int color = attr & 0x0f;
int flipx = attr & 0x10;
int flipy = attr & 0x20;
int sx = spriteram[i + 2] - ((attr & 0x80) << 1);
int sy = spriteram[i + 3];
if (flip_screen())
{
sx = 240 - sx;
sy = 240 - sy;
flipx = !flipx;
flipy = !flipy;
}
m_gfxdecode->gfx(1)->transmask(bitmap,cliprect, code, color, flipx, flipy,
sx, sy,
m_palette->transpen_mask(*m_gfxdecode->gfx(1), color, 0));
}
}
uint32_t jailbrek_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
int i;
// added support for vertical scrolling (credits). 23/1/2002 -BR
// bit 2 appears to be horizontal/vertical scroll control
if (m_scroll_dir[0] & 0x04)
{
m_bg_tilemap->set_scroll_cols(32);
m_bg_tilemap->set_scroll_rows(1);
m_bg_tilemap->set_scrollx(0, 0);
for (i = 0; i < 32; i++)
m_bg_tilemap->set_scrolly(i, ((m_scroll_x[i + 32] << 8) + m_scroll_x[i]));
}
else
{
m_bg_tilemap->set_scroll_rows(32);
m_bg_tilemap->set_scroll_cols(1);
m_bg_tilemap->set_scrolly(0, 0);
for (i = 0; i < 32; i++)
m_bg_tilemap->set_scrollx(i, ((m_scroll_x[i + 32] << 8) + m_scroll_x[i]));
}
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
draw_sprites(bitmap, cliprect);
return 0;
}
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