// license:BSD-3-Clause
// copyright-holders:Brad Oliver
/***************************************************************************
video/jack.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "emu.h"
#include "includes/jack.h"
WRITE8_MEMBER(jack_state::jack_videoram_w)
{
m_videoram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset);
}
WRITE8_MEMBER(jack_state::jack_colorram_w)
{
m_colorram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset);
}
READ8_MEMBER(jack_state::jack_flipscreen_r)
{
flip_screen_set(offset);
return 0;
}
WRITE8_MEMBER(jack_state::jack_flipscreen_w)
{
flip_screen_set(offset);
}
/**************************************************************************/
TILE_GET_INFO_MEMBER(jack_state::get_bg_tile_info)
{
int code = m_videoram[tile_index] + ((m_colorram[tile_index] & 0x18) << 5);
int color = m_colorram[tile_index] & 0x07;
// striv: m_colorram[tile_index] & 0x80 ???
SET_TILE_INFO_MEMBER(0, code, color, 0);
}
TILEMAP_MAPPER_MEMBER(jack_state::tilemap_scan_cols_flipy)
{
/* logical (col,row) -> memory offset */
return (col * num_rows) + (num_rows - 1 - row);
}
void jack_state::video_start()
{
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(jack_state::get_bg_tile_info),this), tilemap_mapper_delegate(FUNC(jack_state::tilemap_scan_cols_flipy),this), 8, 8, 32, 32);
}
/**************************************************************************/
void jack_state::jack_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 sy = spriteram[offs];
int sx = spriteram[offs + 1];
int code = spriteram[offs + 2] | ((spriteram[offs + 3] & 0x08) << 5);
int color = spriteram[offs + 3] & 0x07;
int flipx = (spriteram[offs + 3] & 0x80) >> 7;
int flipy = (spriteram[offs + 3] & 0x40) >> 6;
if (flip_screen())
{
sx = 248 - sx;
sy = 248 - sy;
flipx = !flipx;
flipy = !flipy;
}
m_gfxdecode->gfx(0)->transpen(bitmap,cliprect,
code,
color,
flipx,flipy,
sx,sy,0);
}
}
uint32_t jack_state::screen_update_jack(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
jack_draw_sprites(bitmap, cliprect);
return 0;
}
uint32_t jack_state::screen_update_striv(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
// no sprites
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
return 0;
}
/***************************************************************************
Joinem has a bit different video hardware with proms based palette,
3bpp gfx and different banking / colors bits
***************************************************************************/
WRITE8_MEMBER(jack_state::joinem_scroll_w)
{
switch (offset & 3)
{
// byte 0: column scroll
case 0:
m_bg_tilemap->set_scrolly(offset >> 2, -data);
break;
// byte 1/2/3: no effect?
default:
break;
}
m_scrollram[offset] = data;
}
/**************************************************************************/
PALETTE_INIT_MEMBER(jack_state,joinem)
{
const uint8_t *color_prom = memregion("proms")->base();
int i;
for (i = 0; i < palette.entries(); i++)
{
int bit0, bit1, bit2, r, g, b;
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;
bit0 = (color_prom[i] >> 3) & 0x01;
bit1 = (color_prom[i] >> 4) & 0x01;
bit2 = (color_prom[i] >> 5) & 0x01;
g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
bit0 = 0;
bit1 = (color_prom[i] >> 6) & 0x01;
bit2 = (color_prom[i] >> 7) & 0x01;
b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
palette.set_pen_color(i, rgb_t(r,g,b));
}
}
TILE_GET_INFO_MEMBER(jack_state::joinem_get_bg_tile_info)
{
int code = m_videoram[tile_index] + ((m_colorram[tile_index] & 0x03) << 8);
int color = (m_colorram[tile_index] & 0x38) >> 3 | m_joinem_palette_bank;
SET_TILE_INFO_MEMBER(0, code, color, 0);
}
VIDEO_START_MEMBER(jack_state,joinem)
{
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(jack_state::joinem_get_bg_tile_info),this), tilemap_mapper_delegate(FUNC(jack_state::tilemap_scan_cols_flipy),this), 8, 8, 32, 32);
m_bg_tilemap->set_scroll_cols(32);
}
/**************************************************************************/
void jack_state::joinem_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 sy = spriteram[offs];
int sx = spriteram[offs + 1];
int code = spriteram[offs + 2] | ((spriteram[offs + 3] & 0x03) << 8);
int color = (spriteram[offs + 3] & 0x38) >> 3 | m_joinem_palette_bank;
int flipx = (spriteram[offs + 3] & 0x80) >> 7;
int flipy = (spriteram[offs + 3] & 0x40) >> 6;
if (flip_screen())
{
sx = 248 - sx;
sy = 248 - sy;
flipx = !flipx;
flipy = !flipy;
}
m_gfxdecode->gfx(0)->transpen(bitmap,cliprect,
code,
color,
flipx,flipy,
sx,sy,0);
}
}
uint32_t jack_state::screen_update_joinem(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
joinem_draw_sprites(bitmap, cliprect);
return 0;
}