// license:BSD-3-Clause
// copyright-holders:Zsolt Vasvari, Couriersud
/***************************************************************************
video.c
Functions to emulate the video hardware of the machine.
This file is also used by scregg.c
***************************************************************************/
#include "emu.h"
#include "includes/btime.h"
/***************************************************************************
Burger Time doesn't have a color PROM. It uses RAM to dynamically
create the palette.
The palette RAM is connected to the RGB output this way:
bit 7 -- 15 kohm resistor -- BLUE (inverted)
-- 33 kohm resistor -- BLUE (inverted)
-- 15 kohm resistor -- GREEN (inverted)
-- 33 kohm resistor -- GREEN (inverted)
-- 47 kohm resistor -- GREEN (inverted)
-- 15 kohm resistor -- RED (inverted)
-- 33 kohm resistor -- RED (inverted)
bit 0 -- 47 kohm resistor -- RED (inverted)
***************************************************************************/
PALETTE_INIT_MEMBER(btime_state,btime)
{
/* Burger Time doesn't have a color PROM, but Hamburge has. */
/* This function is also used by Eggs. */
if (m_prom_region == nullptr)
{
return;
}
const uint8_t *color_prom = m_prom_region->base();
for (int i = 0; i < palette.entries(); i++)
{
/* red component */
int bit0 = (color_prom[i] >> 0) & 0x01;
int bit1 = (color_prom[i] >> 1) & 0x01;
int bit2 = (color_prom[i] >> 2) & 0x01;
int r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* green component */
bit0 = (color_prom[i] >> 3) & 0x01;
bit1 = (color_prom[i] >> 4) & 0x01;
bit2 = (color_prom[i] >> 5) & 0x01;
int g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* blue component */
bit0 = 0;
bit1 = (color_prom[i] >> 6) & 0x01;
bit2 = (color_prom[i] >> 7) & 0x01;
int b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
palette.set_pen_color(i, rgb_t(r,g,b));
}
}
/***************************************************************************
Convert the color PROMs into a more useable format.
The PROM is connected to the RGB output this way:
bit 7 -- 47 kohm resistor -- RED
-- 33 kohm resistor -- RED
-- 15 kohm resistor -- RED
-- 47 kohm resistor -- GREEN
-- 33 kohm resistor -- GREEN
-- 15 kohm resistor -- GREEN
-- 33 kohm resistor -- BLUE
bit 0 -- 15 kohm resistor -- BLUE
***************************************************************************/
PALETTE_INIT_MEMBER(btime_state,lnc)
{
const uint8_t *color_prom = memregion("proms")->base();
for (int i = 0; i < palette.entries(); i++)
{
/* red component */
int bit0 = (color_prom[i] >> 7) & 0x01;
int bit1 = (color_prom[i] >> 6) & 0x01;
int bit2 = (color_prom[i] >> 5) & 0x01;
int r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* green component */
bit0 = (color_prom[i] >> 4) & 0x01;
bit1 = (color_prom[i] >> 3) & 0x01;
bit2 = (color_prom[i] >> 2) & 0x01;
int g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* blue component */
bit0 = 0;
bit1 = (color_prom[i] >> 1) & 0x01;
bit2 = (color_prom[i] >> 0) & 0x01;
int b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
palette.set_pen_color(i, rgb_t(r,g,b));
}
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
VIDEO_START_MEMBER(btime_state,disco)
{
// graphics are in RAM
m_gfxdecode->gfx(0)->set_source(m_deco_charram);
m_gfxdecode->gfx(1)->set_source(m_deco_charram);
}
VIDEO_START_MEMBER(btime_state,bnj)
{
/* the background area is twice as wide as the screen */
int width = 256;
int height = 256;
m_background_bitmap = std::make_unique<bitmap_ind16>(2 * width, height);
save_item(NAME(*m_background_bitmap));
}
WRITE8_MEMBER(btime_state::lnc_videoram_w)
{
m_videoram[offset] = data;
m_colorram[offset] = *m_lnc_charbank;
}
READ8_MEMBER(btime_state::btime_mirrorvideoram_r)
{
int x, y;
/* swap x and y coordinates */
x = offset / 32;
y = offset % 32;
offset = 32 * y + x;
return m_videoram[offset];
}
READ8_MEMBER(btime_state::btime_mirrorcolorram_r)
{
int x, y;
/* swap x and y coordinates */
x = offset / 32;
y = offset % 32;
offset = 32 * y + x;
return m_colorram[offset];
}
WRITE8_MEMBER(btime_state::btime_mirrorvideoram_w)
{
int x, y;
/* swap x and y coordinates */
x = offset / 32;
y = offset % 32;
offset = 32 * y + x;
m_videoram[offset] = data;
}
WRITE8_MEMBER(btime_state::lnc_mirrorvideoram_w)
{
int x, y;
/* swap x and y coordinates */
x = offset / 32;
y = offset % 32;
offset = 32 * y + x;
lnc_videoram_w(space, offset, data);
}
WRITE8_MEMBER(btime_state::btime_mirrorcolorram_w)
{
int x, y;
/* swap x and y coordinates */
x = offset / 32;
y = offset % 32;
offset = 32 * y + x;
m_colorram[offset] = data;
}
WRITE8_MEMBER(btime_state::deco_charram_w)
{
if (m_deco_charram[offset] == data)
return;
m_deco_charram[offset] = data;
offset &= 0x1fff;
/* dirty sprite */
m_gfxdecode->gfx(1)->mark_dirty(offset >> 5);
/* diry char */
m_gfxdecode->gfx(0)->mark_dirty(offset >> 3);
}
WRITE8_MEMBER(btime_state::bnj_background_w)
{
m_bnj_backgroundram[offset] = data;
}
WRITE8_MEMBER(btime_state::bnj_scroll1_w)
{
m_bnj_scroll1 = data;
}
WRITE8_MEMBER(btime_state::bnj_scroll2_w)
{
m_bnj_scroll2 = data;
}
WRITE8_MEMBER(btime_state::btime_video_control_w)
{
// Btime video control
//
// Bit 0 = Flip screen
// Bit 1-7 = Unknown
flip_screen_set(data & 0x01);
}
WRITE8_MEMBER(btime_state::bnj_video_control_w)
{
/* Bnj/Lnc works a little differently than the btime/eggs (apparently). */
/* According to the information at: */
/* http://www.davesclassics.com/arcade/Switch_Settings/BumpNJump.sw */
/* SW8 is used for cocktail video selection (as opposed to controls), */
/* but bit 7 of the input port is used for vblank input. */
/* My guess is that this switch open circuits some connection to */
/* the monitor hardware. */
/* For now we just check 0x40 in DSW1, and ignore the write if we */
/* are in upright controls mode. */
if (ioport("DSW1")->read() & 0x40) /* cocktail mode */
btime_video_control_w(space, offset, data);
}
WRITE8_MEMBER(btime_state::zoar_video_control_w)
{
// Zoar video control
//
// Bit 0-2 = Unknown (always 0). Marked as MCOL on schematics
// Bit 3-4 = Palette
// Bit 7 = Flip Screen
m_btime_palette = (data & 0x30) >> 3;
if (ioport("DSW1")->read() & 0x40) /* cocktail mode */
flip_screen_set(data & 0x80);
}
WRITE8_MEMBER(btime_state::disco_video_control_w)
{
m_btime_palette = (data >> 2) & 0x03;
if (!(ioport("DSW1")->read() & 0x40)) /* cocktail mode */
flip_screen_set(data & 0x01);
}
void btime_state::draw_chars( bitmap_ind16 &bitmap, const rectangle &cliprect, uint8_t transparency, uint8_t color, int priority )
{
offs_t offs;
for (offs = 0; offs < m_videoram.bytes(); offs++)
{
uint8_t x = 31 - (offs / 32);
uint8_t y = offs % 32;
uint16_t code = m_videoram[offs] + 256 * (m_colorram[offs] & 3);
/* check priority */
if ((priority != -1) && (priority != ((code >> 7) & 0x01)))
continue;
if (flip_screen())
{
x = 31 - x;
y = 31 - y;
}
m_gfxdecode->gfx(0)->transpen(bitmap,cliprect,
code,
color,
flip_screen(),flip_screen(),
8*x,8*y,
transparency ? 0 : -1);
}
}
void btime_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect, uint8_t color,
uint8_t sprite_y_adjust, uint8_t sprite_y_adjust_flip_screen,
uint8_t *sprite_ram, offs_t interleave )
{
int i;
offs_t offs;
/* draw the sprites */
for (i = 0, offs = 0; i < 8; i++, offs += 4 * interleave)
{
int x, y;
uint8_t flipx, flipy;
if (!(sprite_ram[offs + 0] & 0x01)) continue;
x = 240 - sprite_ram[offs + 3 * interleave];
y = 240 - sprite_ram[offs + 2 * interleave];
flipx = sprite_ram[offs + 0] & 0x04;
flipy = sprite_ram[offs + 0] & 0x02;
if (flip_screen())
{
x = 240 - x;
y = 240 - y + sprite_y_adjust_flip_screen;
flipx = !flipx;
flipy = !flipy;
}
y = y - sprite_y_adjust;
m_gfxdecode->gfx(1)->transpen(bitmap,cliprect,
sprite_ram[offs + interleave],
color,
flipx,flipy,
x, y,0);
y = y + (flip_screen() ? -256 : 256);
// Wrap around
m_gfxdecode->gfx(1)->transpen(bitmap,cliprect,
sprite_ram[offs + interleave],
color,
flipx,flipy,
x,y,0);
}
}
void btime_state::draw_background( bitmap_ind16 &bitmap, const rectangle &cliprect, uint8_t* tmap, uint8_t color )
{
int i;
const uint8_t *gfx = memregion("bg_map")->base();
int scroll = -(m_bnj_scroll2 | ((m_bnj_scroll1 & 0x03) << 8));
// One extra iteration for wrap around
for (i = 0; i < 5; i++, scroll += 256)
{
offs_t offs;
offs_t tileoffset = tmap[i & 3] * 0x100;
// Skip if this tile is completely off the screen
if (scroll > 256)
break;
if (scroll < -256)
continue;
for (offs = 0; offs < 0x100; offs++)
{
int x = 240 - (16 * (offs / 16) + scroll) - 1;
int y = 16 * (offs % 16);
if (flip_screen())
{
x = 240 - x;
y = 240 - y;
}
m_gfxdecode->gfx(2)->opaque(bitmap,cliprect,
gfx[tileoffset + offs],
color,
flip_screen(),flip_screen(),
x,y);
}
}
}
uint32_t btime_state::screen_update_btime(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
if (m_bnj_scroll1 & 0x10)
{
int i, start;
// Generate tile map
if (flip_screen())
start = 0;
else
start = 1;
for (i = 0; i < 4; i++)
{
m_btime_tilemap[i] = start | (m_bnj_scroll1 & 0x04);
start = (start + 1) & 0x03;
}
draw_background(bitmap, cliprect, m_btime_tilemap, 0);
draw_chars(bitmap, cliprect, true, 0, -1);
}
else
draw_chars(bitmap, cliprect, false, 0, -1);
draw_sprites(bitmap, cliprect, 0, 1, 0, m_videoram, 0x20);
return 0;
}
uint32_t btime_state::screen_update_eggs(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
draw_chars(bitmap, cliprect, false, 0, -1);
draw_sprites(bitmap, cliprect, 0, 0, 0, m_videoram, 0x20);
return 0;
}
uint32_t btime_state::screen_update_lnc(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
draw_chars(bitmap, cliprect, false, 0, -1);
draw_sprites(bitmap, cliprect, 0, 1, 2, m_videoram, 0x20);
return 0;
}
uint32_t btime_state::screen_update_zoar(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
if (m_bnj_scroll1 & 0x04)
{
draw_background(bitmap, cliprect, m_zoar_scrollram, m_btime_palette);
draw_chars(bitmap, cliprect, true, m_btime_palette + 1, -1);
}
else
draw_chars(bitmap, cliprect, false, m_btime_palette + 1, -1);
/* The order is important for correct priorities */
draw_sprites(bitmap, cliprect, m_btime_palette + 1, 1, 2, m_videoram + 0x1f, 0x20);
draw_sprites(bitmap, cliprect, m_btime_palette + 1, 1, 2, m_videoram, 0x20);
return 0;
}
uint32_t btime_state::screen_update_bnj(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
if (m_bnj_scroll1)
{
int scroll, offs;
for (offs = m_bnj_backgroundram.bytes() - 1; offs >=0; offs--)
{
int sx, sy;
sx = 16 * ((offs < 0x100) ? ((offs % 0x80) / 8) : ((offs % 0x80) / 8) + 16);
sy = 16 * (((offs % 0x100) < 0x80) ? offs % 8 : (offs % 8) + 8);
sx = 496 - sx;
if (flip_screen())
{
sx = 496 - sx;
sy = 240 - sy;
}
m_gfxdecode->gfx(2)->opaque(*m_background_bitmap,m_background_bitmap->cliprect(),
(m_bnj_backgroundram[offs] >> 4) + ((offs & 0x80) >> 3) + 32,
0,
flip_screen(), flip_screen(),
sx, sy);
}
/* copy the background bitmap to the screen */
scroll = (m_bnj_scroll1 & 0x02) * 128 + 511 - m_bnj_scroll2;
if (!flip_screen())
scroll = 767 - scroll;
copyscrollbitmap(bitmap, *m_background_bitmap, 1, &scroll, 0, nullptr, cliprect);
/* copy the low priority characters followed by the sprites
then the high priority characters */
draw_chars(bitmap, cliprect, true, 0, 1);
draw_sprites(bitmap, cliprect, 0, 0, 0, m_videoram, 0x20);
draw_chars(bitmap, cliprect, true, 0, 0);
}
else
{
draw_chars(bitmap, cliprect, false, 0, -1);
draw_sprites(bitmap, cliprect, 0, 0, 0, m_videoram, 0x20);
}
return 0;
}
uint32_t btime_state::screen_update_cookrace(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
int offs;
for (offs = m_bnj_backgroundram.bytes() - 1; offs >=0; offs--)
{
int sx, sy;
sx = 31 - (offs / 32);
sy = offs % 32;
if (flip_screen())
{
sx = 31 - sx;
sy = 31 - sy;
}
m_gfxdecode->gfx(2)->opaque(bitmap,cliprect,
m_bnj_backgroundram[offs],
0,
flip_screen(), flip_screen(),
8*sx,8*sy);
}
draw_chars(bitmap, cliprect, true, 0, -1);
draw_sprites(bitmap, cliprect, 0, 1, 0, m_videoram, 0x20);
return 0;
}
uint32_t btime_state::screen_update_disco(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
draw_chars(bitmap, cliprect, false, m_btime_palette, -1);
draw_sprites(bitmap, cliprect, m_btime_palette, 0, 0, m_spriteram, 1);
return 0;
}