// license:BSD-3-Clause
// copyright-holders:Bryan McPhail
/***************************************************************************
video.c
***************************************************************************/
#include "emu.h"
#include "includes/nemesis.h"
#include "video/resnet.h"
static const struct
{
uint8_t width;
uint8_t height;
uint8_t char_type;
}
sprite_data[8] =
{
{ 32, 32, 4 }, { 16, 32, 5 }, { 32, 16, 2 }, { 64, 64, 7 },
{ 8, 8, 0 }, { 16, 8, 6 }, { 8, 16, 3 }, { 16, 16, 1 }
};
TILE_GET_INFO_MEMBER(nemesis_state::get_bg_tile_info)
{
int code, color, flags, mask, layer;
code = m_videoram2[tile_index];
color = m_colorram2[tile_index];
flags = 0;
if (color & 0x80)
flags |= TILE_FLIPX;
if (code & 0x0800)
flags |= TILE_FLIPY;
if ((~code & 0x2000) || ((code & 0xc000) == 0x4000))
flags |= TILE_FORCE_LAYER0; /* no transparency */
if (code & 0xf800)
{
SET_TILE_INFO_MEMBER(0, code & 0x7ff, color & 0x7f, flags );
}
else
{
SET_TILE_INFO_MEMBER(0, 0, 0x00, 0 );
tileinfo.pen_data = m_blank_tile;
}
mask = (code & 0x1000) >> 12;
layer = (code & 0x4000) >> 14;
if (mask && !layer)
layer = 1;
tileinfo.category = mask | (layer << 1);
}
TILE_GET_INFO_MEMBER(nemesis_state::get_fg_tile_info)
{
int code, color, flags, mask, layer;
code = m_videoram1[tile_index];
color = m_colorram1[tile_index];
flags = 0;
if (color & 0x80)
flags |= TILE_FLIPX;
if (code & 0x0800)
flags |= TILE_FLIPY;
if ((~code & 0x2000) || ((code & 0xc000) == 0x4000))
flags |= TILE_FORCE_LAYER0; /* no transparency */
if (code & 0xf800)
{
SET_TILE_INFO_MEMBER(0, code & 0x7ff, color & 0x7f, flags );
}
else
{
SET_TILE_INFO_MEMBER(0, 0, 0x00, 0 );
tileinfo.pen_data = m_blank_tile;
}
mask = (code & 0x1000) >> 12;
layer = (code & 0x4000) >> 14;
if (mask && !layer)
layer = 1;
tileinfo.category = mask | (layer << 1);
}
WRITE_LINE_MEMBER(nemesis_state::gfx_flipx_w)
{
m_flipscreen = state;
if (state)
m_tilemap_flip |= TILEMAP_FLIPX;
else
m_tilemap_flip &= ~TILEMAP_FLIPX;
machine().tilemap().set_flip_all(m_tilemap_flip);
}
WRITE_LINE_MEMBER(nemesis_state::gfx_flipy_w)
{
if (state)
m_tilemap_flip |= TILEMAP_FLIPY;
else
m_tilemap_flip &= ~TILEMAP_FLIPY;
machine().tilemap().set_flip_all(m_tilemap_flip);
}
WRITE16_MEMBER(nemesis_state::salamand_control_port_word_w)
{
if (ACCESSING_BITS_0_7)
{
uint8_t accessing_bits = data ^ m_irq_port_last;
m_irq_on = data & 0x01;
m_irq2_on = data & 0x02;
m_flipscreen = data & 0x04;
if (data & 0x04)
m_tilemap_flip |= TILEMAP_FLIPX;
else
m_tilemap_flip &= ~TILEMAP_FLIPX;
if (data & 0x08)
m_tilemap_flip |= TILEMAP_FLIPY;
else
m_tilemap_flip &= ~TILEMAP_FLIPY;
if (accessing_bits & 0x0c)
machine().tilemap().set_flip_all(m_tilemap_flip);
m_irq_port_last = data;
}
if (ACCESSING_BITS_8_15)
{
machine().bookkeeping().coin_lockout_w(0, data & 0x0200);
machine().bookkeeping().coin_lockout_w(1, data & 0x0400);
if (data & 0x0800)
m_audiocpu->set_input_line(0, HOLD_LINE);
m_selected_ip = (~data & 0x1000) >> 12; /* citybomb steering & accel */
}
}
void nemesis_state::create_palette_lookups()
{
// driver is 74LS09 (AND gates with open collector)
static const res_net_info nemesis_net_info =
{
RES_NET_VCC_5V | RES_NET_VBIAS_5V | RES_NET_VIN_OPEN_COL,
{
{ RES_NET_AMP_EMITTER, 1000, 0, 5, { 4700, 2400, 1200, 620, 300 } },
{ RES_NET_AMP_EMITTER, 1000, 0, 5, { 4700, 2400, 1200, 620, 300 } },
{ RES_NET_AMP_EMITTER, 1000, 0, 5, { 4700, 2400, 1200, 620, 300 } }
}
};
for (int i = 0; i < 32; i++)
m_palette_lookup[i] = compute_res_net(i, 0, nemesis_net_info);
// normalize black/white levels
double black = m_palette_lookup[0];
double white = 255.0 / (m_palette_lookup[31] - black);
for (auto & elem : m_palette_lookup)
elem = (elem - black) * white + 0.5;
}
WRITE16_MEMBER(nemesis_state::nemesis_palette_word_w)
{
COMBINE_DATA(m_paletteram + offset);
data = m_paletteram[offset];
int r = (data >> 0) & 0x1f;
int g = (data >> 5) & 0x1f;
int b = (data >> 10) & 0x1f;
m_palette->set_pen_color(offset, m_palette_lookup[r],m_palette_lookup[g],m_palette_lookup[b]);
}
WRITE16_MEMBER(nemesis_state::nemesis_videoram1_word_w)
{
COMBINE_DATA(m_videoram1 + offset);
m_foreground->mark_tile_dirty(offset);
}
WRITE16_MEMBER(nemesis_state::nemesis_videoram2_word_w)
{
COMBINE_DATA(m_videoram2 + offset);
m_background->mark_tile_dirty(offset);
}
WRITE16_MEMBER(nemesis_state::nemesis_colorram1_word_w)
{
COMBINE_DATA(m_colorram1 + offset);
m_foreground->mark_tile_dirty(offset);
}
WRITE16_MEMBER(nemesis_state::nemesis_colorram2_word_w)
{
COMBINE_DATA(m_colorram2 + offset);
m_background->mark_tile_dirty(offset);
}
WRITE16_MEMBER(nemesis_state::nemesis_charram_word_w)
{
uint16_t oldword = m_charram[offset];
COMBINE_DATA(m_charram + offset);
data = m_charram[offset];
if (oldword != data)
{
int i;
for (i = 0; i < 8; i++)
{
int w = sprite_data[i].width;
int h = sprite_data[i].height;
m_gfxdecode->gfx(sprite_data[i].char_type)->mark_dirty(offset * 4 / (w * h));
}
}
}
void nemesis_state::nemesis_postload()
{
for (int i = 0; i < 8; i++)
{
m_gfxdecode->gfx(i)->mark_all_dirty();
}
}
void nemesis_state::video_start()
{
create_palette_lookups();
m_spriteram_words = m_spriteram.bytes() / 2;
m_background = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(nemesis_state::get_bg_tile_info),this), TILEMAP_SCAN_ROWS, 8, 8, 64, 32);
m_foreground = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(nemesis_state::get_fg_tile_info),this), TILEMAP_SCAN_ROWS, 8, 8, 64, 32);
m_background->set_transparent_pen(0);
m_foreground->set_transparent_pen(0);
m_background->set_scroll_rows(256);
m_foreground->set_scroll_rows(256);
memset(m_charram, 0, m_charram.bytes());
memset(m_blank_tile, 0, ARRAY_LENGTH(m_blank_tile));
/* Set up save state */
machine().save().register_postload(save_prepost_delegate(FUNC(nemesis_state::nemesis_postload), this));
}
void nemesis_state::draw_sprites( screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect )
{
/*
* 16 bytes per sprite, in memory from 56000-56fff
*
* byte 0 : relative priority.
* byte 2 : size (?) value #E0 means not used., bit 0x01 is flipx
0xc0 is upper 2 bits of zoom.
0x38 is size.
* byte 4 : zoom = 0xff
* byte 6 : low bits sprite code.
* byte 8 : color + hi bits sprite code., bit 0x20 is flipy bit. bit 0x01 is high bit of X pos.
* byte A : X position.
* byte C : Y position.
* byte E : not used.
*/
uint16_t *spriteram = m_spriteram;
int address; /* start of sprite in spriteram */
int sx; /* sprite X-pos */
int sy; /* sprite Y-pos */
int code; /* start of sprite in obj RAM */
int color; /* color of the sprite */
int flipx,flipy;
int zoom;
int char_type;
int priority;
int size;
int w,h;
int idx;
for (priority = 256 - 1; priority >= 0; priority--)
{
for (address = m_spriteram_words - 8; address >= 0; address -= 8)
{
if((spriteram[address] & 0xff) != priority)
continue;
zoom = spriteram[address + 2] & 0xff;
if (!(spriteram[address + 2] & 0xff00) && ((spriteram[address + 3] & 0xff00) != 0xff00))
code = spriteram[address + 3] + ((spriteram[address + 4] & 0xc0) << 2);
else
code = (spriteram[address + 3] & 0xff) + ((spriteram[address + 4] & 0xc0) << 2);
if (zoom != 0xff || code != 0)
{
size = spriteram[address + 1];
zoom += (size & 0xc0) << 2;
sx = spriteram[address + 5] & 0xff;
sy = spriteram[address + 6] & 0xff;
if (spriteram[address + 4] & 0x01)
sx-=0x100; /* fixes left side clip */
color = (spriteram[address + 4] & 0x1e) >> 1;
flipx = spriteram[address + 1] & 0x01;
flipy = spriteram[address + 4] & 0x20;
idx = (size >> 3) & 7;
w = sprite_data[idx].width;
h = sprite_data[idx].height;
code = code * 8 * 16 / (w * h);
char_type = sprite_data[idx].char_type;
if (zoom)
{
zoom = ((1 << 16) * 0x80 / zoom) + 0x02ab;
if (m_flipscreen)
{
sx = 256 - ((zoom * w) >> 16) - sx;
sy = 256 - ((zoom * h) >> 16) - sy;
flipx = !flipx;
flipy = !flipy;
}
m_gfxdecode->gfx(char_type)->prio_zoom_transpen(bitmap,cliprect,
code,
color,
flipx,flipy,
sx,sy,
zoom,zoom,
screen.priority(),0xffcc,0 );
}
}
}
}
}
/******************************************************************************/
uint32_t nemesis_state::screen_update_nemesis(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
int offs;
rectangle clip;
screen.priority().fill(0, cliprect);
bitmap.fill(0, cliprect);
clip.min_x = 0;
clip.max_x = 255;
m_background->set_scroll_cols(64);
m_foreground->set_scroll_cols(64);
m_background->set_scroll_rows(1);
m_foreground->set_scroll_rows(1);
for (offs = 0; offs < 64; offs++)
{
int offset_x = offs;
if (m_flipscreen)
offset_x = (offs + 0x20) & 0x3f;
m_background->set_scrolly(offs, m_yscroll2[offset_x]);
m_foreground->set_scrolly(offs, m_yscroll1[offset_x]);
}
for (offs = cliprect.min_y; offs <= cliprect.max_y; offs++)
{
int i;
int offset_y = offs;
clip.min_y = offs;
clip.max_y = offs;
if (m_flipscreen)
offset_y = 255 - offs;
m_background->set_scrollx(0, (m_xscroll2[offset_y] & 0xff) + ((m_xscroll2[0x100 + offset_y] & 0x01) << 8) - (m_flipscreen ? 0x107 : 0));
m_foreground->set_scrollx(0, (m_xscroll1[offset_y] & 0xff) + ((m_xscroll1[0x100 + offset_y] & 0x01) << 8) - (m_flipscreen ? 0x107 : 0));
for (i = 0; i < 4; i += 2)
{
m_background->draw(screen, bitmap, clip, TILEMAP_DRAW_CATEGORY(i + 0), 1);
m_background->draw(screen, bitmap, clip, TILEMAP_DRAW_CATEGORY(i + 1), 2);
m_foreground->draw(screen, bitmap, clip, TILEMAP_DRAW_CATEGORY(i + 0), 1);
m_foreground->draw(screen, bitmap, clip, TILEMAP_DRAW_CATEGORY(i + 1), 2);
}
}
draw_sprites(screen,bitmap,cliprect);
return 0;
}