// license:BSD-3-Clause
// copyright-holders:BUT
/*
* Chack'n Pop (C) 1983 TAITO Corp.
* emulate video hardware
*/
#include "emu.h"
#include "includes/chaknpop.h"
#define GFX_FLIP_X 0x01
#define GFX_FLIP_Y 0x02
#define GFX_VRAM_BANK 0x04
#define GFX_UNKNOWN1 0x08
#define GFX_TX_BANK1 0x20
#define GFX_UNKNOWN2 0x40
#define GFX_TX_BANK2 0x80
#define TX_COLOR1 0x0b
#define TX_COLOR2 0x01
/***************************************************************************
palette decode
***************************************************************************/
PALETTE_INIT_MEMBER(chaknpop_state, chaknpop)
{
const uint8_t *color_prom = memregion("proms")->base();
for (int i = 0; i < 1024; i++)
{
int col, r, g, b;
int bit0, bit1, bit2;
col = (color_prom[i] & 0x0f) + ((color_prom[i + 1024] & 0x0f) << 4);
/* red component */
bit0 = (col >> 0) & 0x01;
bit1 = (col >> 1) & 0x01;
bit2 = (col >> 2) & 0x01;
r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* green component */
bit0 = (col >> 3) & 0x01;
bit1 = (col >> 4) & 0x01;
bit2 = (col >> 5) & 0x01;
g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* blue component */
bit0 = 0;
bit1 = (col >> 6) & 0x01;
bit2 = (col >> 7) & 0x01;
b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
palette.set_pen_color(i, rgb_t(r, g, b));
}
}
/***************************************************************************
Memory handlers
***************************************************************************/
void chaknpop_state::tx_tilemap_mark_all_dirty()
{
m_tx_tilemap->mark_all_dirty();
m_tx_tilemap->set_flip(m_flip_x | m_flip_y);
}
READ8_MEMBER(chaknpop_state::gfxmode_r)
{
return m_gfxmode;
}
WRITE8_MEMBER(chaknpop_state::gfxmode_w)
{
if (m_gfxmode != data)
{
int all_dirty = 0;
m_gfxmode = data;
membank("bank1")->set_entry((m_gfxmode & GFX_VRAM_BANK) ? 1 : 0); /* Select 2 banks of 16k */
if (m_flip_x != (m_gfxmode & GFX_FLIP_X))
{
m_flip_x = m_gfxmode & GFX_FLIP_X;
all_dirty = 1;
}
if (m_flip_y != (m_gfxmode & GFX_FLIP_Y))
{
m_flip_y = m_gfxmode & GFX_FLIP_Y;
all_dirty = 1;
}
if (all_dirty)
tx_tilemap_mark_all_dirty();
}
}
WRITE8_MEMBER(chaknpop_state::txram_w)
{
m_tx_ram[offset] = data;
m_tx_tilemap->mark_tile_dirty(offset);
}
WRITE8_MEMBER(chaknpop_state::attrram_w)
{
if (m_attr_ram[offset] != data)
{
m_attr_ram[offset] = data;
if (offset == TX_COLOR1 || offset == TX_COLOR2)
tx_tilemap_mark_all_dirty();
}
}
/***************************************************************************
Callback for the tilemap code
***************************************************************************/
/*
* I'm not sure how to handle attributes about color
*/
TILE_GET_INFO_MEMBER(chaknpop_state::get_tx_tile_info)
{
int tile = m_tx_ram[tile_index];
int tile_h_bank = (m_gfxmode & GFX_TX_BANK2) << 2; /* 0x00-0xff -> 0x200-0x2ff */
int color = m_attr_ram[TX_COLOR2];
if (tile == 0x74)
color = m_attr_ram[TX_COLOR1];
if (m_gfxmode & GFX_TX_BANK1 && tile >= 0xc0)
tile += 0xc0; /* 0xc0-0xff -> 0x180-0x1bf */
tile |= tile_h_bank;
SET_TILE_INFO_MEMBER(1, tile, color, 0);
}
/***************************************************************************
Initialize video hardware emulation
***************************************************************************/
void chaknpop_state::video_start()
{
uint8_t *RAM = memregion("maincpu")->base();
/* info offset type w h col row */
m_tx_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(chaknpop_state::get_tx_tile_info),this), TILEMAP_SCAN_ROWS, 8, 8, 32, 32);
m_vram1 = &RAM[0x10000];
m_vram2 = &RAM[0x12000];
m_vram3 = &RAM[0x14000];
m_vram4 = &RAM[0x16000];
save_pointer(NAME(m_vram1), 0x2000);
save_pointer(NAME(m_vram2), 0x2000);
save_pointer(NAME(m_vram3), 0x2000);
save_pointer(NAME(m_vram4), 0x2000);
membank("bank1")->set_entry(0);
tx_tilemap_mark_all_dirty();
machine().save().register_postload(save_prepost_delegate(FUNC(chaknpop_state::tx_tilemap_mark_all_dirty), this));
}
/***************************************************************************
Screen refresh
***************************************************************************/
void chaknpop_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect )
{
/* Draw the sprites */
for (int offs = 0; offs < m_spr_ram.bytes(); offs += 4)
{
int sx = m_spr_ram[offs + 3];
int sy = 256 - 15 - m_spr_ram[offs];
int flipx = m_spr_ram[offs+1] & 0x40;
int flipy = m_spr_ram[offs+1] & 0x80;
int color = (m_spr_ram[offs + 2] & 7);
int tile = (m_spr_ram[offs + 1] & 0x3f) | ((m_spr_ram[offs + 2] & 0x38) << 3);
if (m_flip_x)
{
sx = 240 - sx;
flipx = !flipx;
}
if (m_flip_y)
{
sy = 242 - sy;
flipy = !flipy;
}
m_gfxdecode->gfx(0)->transpen(bitmap,cliprect,
tile,
color,
flipx, flipy,
sx, sy, 0);
}
}
void chaknpop_state::draw_bitmap( bitmap_ind16 &bitmap, const rectangle &cliprect )
{
int dx = m_flip_x ? -1 : 1;
int offs, i;
for (offs = 0; offs < 0x2000; offs++)
{
int x = ((offs & 0x1f) << 3) + 7;
int y = offs >> 5;
if (!m_flip_x)
x = 255 - x;
if (!m_flip_y)
y = 255 - y;
for (i = 0x80; i > 0; i >>= 1, x += dx)
{
pen_t color = 0;
if (m_vram1[offs] & i)
color |= 0x200; // green lower cage
if (m_vram2[offs] & i)
color |= 0x080;
if (m_vram3[offs] & i)
color |= 0x100; // green upper cage
if (m_vram4[offs] & i)
color |= 0x040; // tx mask
if (color)
{
pen_t pen = bitmap.pix16(y, x);
pen |= color;
bitmap.pix16(y, x) = pen;
}
}
}
}
uint32_t chaknpop_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_tx_tilemap->draw(screen, bitmap, cliprect, 0, 0);
draw_sprites(bitmap, cliprect);
draw_bitmap(bitmap, cliprect);
return 0;
}