// license:BSD-3-Clause
// copyright-holders:Zsolt Vasvari
/***************************************************************************
video.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "emu.h"
#include "includes/marineb.h"
PALETTE_INIT_MEMBER(marineb_state, marineb)
{
const uint8_t *color_prom = memregion("proms")->base();
int i;
for (i = 0; i < palette.entries(); i++)
{
int bit0, bit1, bit2, r, g, b;
/* red component */
bit0 = (color_prom[i] >> 0) & 0x01;
bit1 = (color_prom[i] >> 1) & 0x01;
bit2 = (color_prom[i] >> 2) & 0x01;
r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* green component */
bit0 = (color_prom[i] >> 3) & 0x01;
bit1 = (color_prom[i + palette.entries()] >> 0) & 0x01;
bit2 = (color_prom[i + palette.entries()] >> 1) & 0x01;
g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* blue component */
bit0 = 0;
bit1 = (color_prom[i + palette.entries()] >> 2) & 0x01;
bit2 = (color_prom[i + palette.entries()] >> 3) & 0x01;
b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
palette.set_pen_color(i, rgb_t(r,g,b));
}
}
/***************************************************************************
Callbacks for the TileMap code
***************************************************************************/
TILE_GET_INFO_MEMBER(marineb_state::get_tile_info)
{
uint8_t code = m_videoram[tile_index];
uint8_t col = m_colorram[tile_index];
SET_TILE_INFO_MEMBER(0,
code | ((col & 0xc0) << 2),
(col & 0x0f) | (m_palette_bank << 4),
TILE_FLIPXY((col >> 4) & 0x03));
}
/*************************************
*
* Video system start
*
*************************************/
void marineb_state::video_start()
{
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(marineb_state::get_tile_info),this), TILEMAP_SCAN_ROWS, 8, 8, 32, 32);
m_bg_tilemap->set_scroll_cols(32);
save_item(NAME(m_palette_bank));
save_item(NAME(m_column_scroll));
save_item(NAME(m_flipscreen_x));
save_item(NAME(m_flipscreen_y));
}
/*************************************
*
* Memory handlers
*
*************************************/
WRITE8_MEMBER(marineb_state::marineb_videoram_w)
{
m_videoram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset);
}
WRITE8_MEMBER(marineb_state::marineb_colorram_w)
{
m_colorram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset);
}
WRITE8_MEMBER(marineb_state::marineb_column_scroll_w)
{
m_column_scroll = data;
}
WRITE8_MEMBER(marineb_state::marineb_palette_bank_0_w)
{
uint8_t old = m_palette_bank;
m_palette_bank = (m_palette_bank & 0x02) | (data & 0x01);
if (old != m_palette_bank)
{
m_bg_tilemap->mark_all_dirty();
}
}
WRITE8_MEMBER(marineb_state::marineb_palette_bank_1_w)
{
uint8_t old = m_palette_bank;
m_palette_bank = (m_palette_bank & 0x01) | ((data & 0x01) << 1);
if (old != m_palette_bank)
{
m_bg_tilemap->mark_all_dirty();
}
}
WRITE_LINE_MEMBER(marineb_state::flipscreen_x_w)
{
m_flipscreen_x = state;
m_bg_tilemap->set_flip((m_flipscreen_x ? TILEMAP_FLIPX : 0) | (m_flipscreen_y ? TILEMAP_FLIPY : 0));
}
WRITE_LINE_MEMBER(marineb_state::flipscreen_y_w)
{
m_flipscreen_y = state;
m_bg_tilemap->set_flip((m_flipscreen_x ? TILEMAP_FLIPX : 0) | (m_flipscreen_y ? TILEMAP_FLIPY : 0));
}
/*************************************
*
* Video update
*
*************************************/
void marineb_state::set_tilemap_scrolly( int cols )
{
int col;
for (col = 0; col < cols; col++)
m_bg_tilemap->set_scrolly(col, m_column_scroll);
for (; col < 32; col++)
m_bg_tilemap->set_scrolly(col, 0);
}
uint32_t marineb_state::screen_update_marineb(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
int offs;
set_tilemap_scrolly(24);
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
/* draw the sprites */
for (offs = 0x0f; offs >= 0; offs--)
{
int gfx, sx, sy, code, col, flipx, flipy, offs2;
if ((offs == 0) || (offs == 2))
continue; /* no sprites here */
if (offs < 8)
offs2 = 0x0018 + offs;
else
offs2 = 0x03d8 - 8 + offs;
code = m_videoram[offs2];
sx = m_videoram[offs2 + 0x20];
sy = m_colorram[offs2];
col = (m_colorram[offs2 + 0x20] & 0x0f) + 16 * m_palette_bank;
flipx = code & 0x02;
flipy = !(code & 0x01);
if (offs < 4)
{
/* big sprite */
gfx = 2;
code = (code >> 4) | ((code & 0x0c) << 2);
}
else
{
/* small sprite */
gfx = 1;
code >>= 2;
}
if (!m_flipscreen_y)
{
sy = 256 - m_gfxdecode->gfx(gfx)->width() - sy;
flipy = !flipy;
}
if (m_flipscreen_x)
{
sx++;
}
m_gfxdecode->gfx(gfx)->transpen(bitmap,cliprect,
code,
col,
flipx,flipy,
sx,sy,0);
}
return 0;
}
uint32_t marineb_state::screen_update_changes(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
int offs, sx, sy, code, col, flipx, flipy;
set_tilemap_scrolly(26);
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
/* draw the small sprites */
for (offs = 0x05; offs >= 0; offs--)
{
int offs2;
offs2 = 0x001a + offs;
code = m_videoram[offs2];
sx = m_videoram[offs2 + 0x20];
sy = m_colorram[offs2];
col = (m_colorram[offs2 + 0x20] & 0x0f) + 16 * m_palette_bank;
flipx = code & 0x02;
flipy = !(code & 0x01);
if (!m_flipscreen_y)
{
sy = 256 - m_gfxdecode->gfx(1)->width() - sy;
flipy = !flipy;
}
if (m_flipscreen_x)
{
sx++;
}
m_gfxdecode->gfx(1)->transpen(bitmap,cliprect,
code >> 2,
col,
flipx,flipy,
sx,sy,0);
}
/* draw the big sprite */
code = m_videoram[0x3df];
sx = m_videoram[0x3ff];
sy = m_colorram[0x3df];
col = m_colorram[0x3ff];
flipx = code & 0x02;
flipy = !(code & 0x01);
if (!m_flipscreen_y)
{
sy = 256 - m_gfxdecode->gfx(2)->width() - sy;
flipy = !flipy;
}
if (m_flipscreen_x)
{
sx++;
}
code >>= 4;
m_gfxdecode->gfx(2)->transpen(bitmap,cliprect,
code,
col,
flipx,flipy,
sx,sy,0);
/* draw again for wrap around */
m_gfxdecode->gfx(2)->transpen(bitmap,cliprect,
code,
col,
flipx,flipy,
sx-256,sy,0);
return 0;
}
uint32_t marineb_state::screen_update_springer(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
int offs;
set_tilemap_scrolly(0);
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
/* draw the sprites */
for (offs = 0x0f; offs >= 0; offs--)
{
int gfx, sx, sy, code, col, flipx, flipy, offs2;
if ((offs == 0) || (offs == 2))
continue; /* no sprites here */
offs2 = 0x0010 + offs;
code = m_videoram[offs2];
sx = 240 - m_videoram[offs2 + 0x20];
sy = m_colorram[offs2];
col = (m_colorram[offs2 + 0x20] & 0x0f) + 16 * m_palette_bank;
flipx = !(code & 0x02);
flipy = !(code & 0x01);
if (offs < 4)
{
/* big sprite */
sx -= 0x10;
gfx = 2;
code = (code >> 4) | ((code & 0x0c) << 2);
}
else
{
/* small sprite */
gfx = 1;
code >>= 2;
}
if (!m_flipscreen_y)
{
sy = 256 - m_gfxdecode->gfx(gfx)->width() - sy;
flipy = !flipy;
}
if (!m_flipscreen_x)
{
sx--;
}
m_gfxdecode->gfx(gfx)->transpen(bitmap,cliprect,
code,
col,
flipx,flipy,
sx,sy,0);
}
return 0;
}
uint32_t marineb_state::screen_update_hoccer(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
int offs;
set_tilemap_scrolly(0);
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
/* draw the sprites */
for (offs = 0x07; offs >= 0; offs--)
{
int sx, sy, code, col, flipx, flipy, offs2;
offs2 = 0x0018 + offs;
code = m_spriteram[offs2];
sx = m_spriteram[offs2 + 0x20];
sy = m_colorram[offs2];
col = m_colorram[offs2 + 0x20];
flipx = code & 0x02;
flipy = !(code & 0x01);
if (!m_flipscreen_y)
{
sy = 256 - m_gfxdecode->gfx(1)->width() - sy;
flipy = !flipy;
}
if (m_flipscreen_x)
{
sx = 256 - m_gfxdecode->gfx(1)->width() - sx;
flipx = !flipx;
}
m_gfxdecode->gfx(1)->transpen(bitmap,cliprect,
code >> 2,
col,
flipx,flipy,
sx,sy,0);
}
return 0;
}
uint32_t marineb_state::screen_update_hopprobo(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
int offs;
set_tilemap_scrolly(0);
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
/* draw the sprites */
for (offs = 0x0f; offs >= 0; offs--)
{
int gfx, sx, sy, code, col, flipx, flipy, offs2;
if ((offs == 0) || (offs == 2))
continue; /* no sprites here */
offs2 = 0x0010 + offs;
code = m_videoram[offs2];
sx = m_videoram[offs2 + 0x20];
sy = m_colorram[offs2];
col = (m_colorram[offs2 + 0x20] & 0x0f) + 16 * m_palette_bank;
flipx = code & 0x02;
flipy = !(code & 0x01);
if (offs < 4)
{
/* big sprite */
gfx = 2;
code = (code >> 4) | ((code & 0x0c) << 2);
}
else
{
/* small sprite */
gfx = 1;
code >>= 2;
}
if (!m_flipscreen_y)
{
sy = 256 - m_gfxdecode->gfx(gfx)->width() - sy;
flipy = !flipy;
}
if (!m_flipscreen_x)
{
sx--;
}
m_gfxdecode->gfx(gfx)->transpen(bitmap,cliprect,
code,
col,
flipx,flipy,
sx,sy,0);
}
return 0;
}