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// license:BSD-3-Clause
// copyright-holders:Ernesto Corvi
/***************************************************************************
Knuckle Joe
***************************************************************************/
#include "emu.h"
#include "includes/kncljoe.h"
/***************************************************************************
Convert the color PROMs into a more useable format.
***************************************************************************/
void kncljoe_state::kncljoe_palette(palette_device &palette) const
{
uint8_t const *color_prom = memregion("proms")->base();
// create a lookup table for the palette
for (int i = 0; i < 0x80; i++)
{
int const r = pal4bit(color_prom[i + 0x000]);
int const g = pal4bit(color_prom[i + 0x100]);
int const b = pal4bit(color_prom[i + 0x200]);
palette.set_indirect_color(i, rgb_t(r, g, b));
}
for (int i = 0; i < 0x10; i++)
{
int bit0, bit1, bit2;
// red component
bit0 = 0;
bit1 = BIT(color_prom[i + 0x300], 6);
bit2 = BIT(color_prom[i + 0x300], 7);
int const r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
// green component
bit0 = BIT(color_prom[i + 0x300], 3);
bit1 = BIT(color_prom[i + 0x300], 4);
bit2 = BIT(color_prom[i + 0x300], 5);
int const g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
// blue component
bit0 = BIT(color_prom[i + 0x300], 0);
bit1 = BIT(color_prom[i + 0x300], 1);
bit2 = BIT(color_prom[i + 0x300], 2);
int const b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
palette.set_indirect_color(i + 0x80, rgb_t(r, g, b));
}
// color_prom now points to the beginning of the lookup table
color_prom += 0x320;
// chars
for (int i = 0; i < 0x80; i++)
palette.set_pen_indirect(i, i);
// sprite lookup table
for (int i = 0; i < 0x80; i++)
{
uint8_t const ctabentry = (color_prom[i] & 0x0f) | 0x80;
palette.set_pen_indirect(i + 0x80, ctabentry);
}
}
/***************************************************************************
Callbacks for the TileMap code
***************************************************************************/
TILE_GET_INFO_MEMBER(kncljoe_state::get_bg_tile_info)
{
int attr = m_videoram[2 * tile_index + 1];
int code = m_videoram[2 * tile_index] + ((attr & 0xc0) << 2) + (m_tile_bank << 10);
tileinfo.set(0,
code,
attr & 0xf,
TILE_FLIPXY((attr & 0x30) >> 4));
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
void kncljoe_state::video_start()
{
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(kncljoe_state::get_bg_tile_info)), TILEMAP_SCAN_ROWS, 8, 8, 64, 32);
m_bg_tilemap->set_scroll_rows(4);
}
/***************************************************************************
Memory handlers
***************************************************************************/
void kncljoe_state::kncljoe_videoram_w(offs_t offset, uint8_t data)
{
m_videoram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset / 2);
}
void kncljoe_state::kncljoe_control_w(uint8_t data)
{
/*
0x01 screen flip
0x02 coin counter#1
0x04 sprite bank
0x10 character bank
0x20 coin counter#2
reset when IN0 - Coin 1 goes low (active)
set after IN0 - Coin 1 goes high AND the credit has been added
*/
m_flipscreen = data & 0x01;
machine().tilemap().set_flip_all(m_flipscreen ? TILEMAP_FLIPX : TILEMAP_FLIPY);
machine().bookkeeping().coin_counter_w(0, data & 0x02);
machine().bookkeeping().coin_counter_w(1, data & 0x20);
if (m_tile_bank != BIT(data, 4))
{
m_tile_bank = BIT(data, 4);
m_bg_tilemap->mark_all_dirty();
}
m_sprite_bank = BIT(data, 2);
}
void kncljoe_state::kncljoe_scroll_w(offs_t offset, uint8_t data)
{
m_scrollregs[offset] = data;
int scrollx = m_scrollregs[0] | m_scrollregs[1] << 8;
m_bg_tilemap->set_scrollx(0, scrollx);
m_bg_tilemap->set_scrollx(1, scrollx);
m_bg_tilemap->set_scrollx(2, scrollx);
m_bg_tilemap->set_scrollx(3, 0);
}
/***************************************************************************
Display refresh
***************************************************************************/
void kncljoe_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect )
{
gfx_element *gfx = m_gfxdecode->gfx(1 + m_sprite_bank);
for (int i = 0; i < 4; i++)
{
// clip vertical strip for each layer
rectangle clip = cliprect;
clip.min_y = m_flipscreen ? (191 - i * 64) : (i * 64 + 1);
clip.max_y = clip.min_y + 63;
clip &= cliprect;
for (int j = 0x7c; j >= 0; j -= 4)
{
int offs = bitswap<2>(~i, 0, 1) << 7 | j;
int sy = m_spriteram[offs] + 1;
int sx = m_spriteram[offs + 3];
int attr = m_spriteram[offs + 1];
int code = m_spriteram[offs + 2] | ((attr & 0x10) << 5) | ((attr & 0x20) << 3);
int flipx = attr & 0x40;
int flipy = !(attr & 0x80);
int color = attr & 0x0f;
if (m_flipscreen)
{
flipx = !flipx;
flipy = !flipy;
sx = 240 - sx;
sy = 240 - sy;
}
if (sx >= 256-8)
sx -= 256;
gfx->transpen(bitmap,clip,
code,
color,
flipx,flipy,
sx,sy,0);
}
}
}
uint32_t kncljoe_state::screen_update_kncljoe(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
draw_sprites(bitmap, cliprect);
return 0;
}
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