// license:BSD-3-Clause
// copyright-holders:Mirko Buffoni
/***************************************************************************
Capcom Vulgus hardware
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "emu.h"
#include "includes/vulgus.h"
/***************************************************************************
Convert the color PROMs into a more useable format.
***************************************************************************/
PALETTE_INIT_MEMBER(vulgus_state, vulgus)
{
const uint8_t *color_prom = memregion("proms")->base();
int i;
for (i = 0;i < 256;i++)
{
int bit0,bit1,bit2,bit3,r,g,b;
bit0 = (color_prom[0] >> 0) & 0x01;
bit1 = (color_prom[0] >> 1) & 0x01;
bit2 = (color_prom[0] >> 2) & 0x01;
bit3 = (color_prom[0] >> 3) & 0x01;
r = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
bit0 = (color_prom[256] >> 0) & 0x01;
bit1 = (color_prom[256] >> 1) & 0x01;
bit2 = (color_prom[256] >> 2) & 0x01;
bit3 = (color_prom[256] >> 3) & 0x01;
g = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
bit0 = (color_prom[2*256] >> 0) & 0x01;
bit1 = (color_prom[2*256] >> 1) & 0x01;
bit2 = (color_prom[2*256] >> 2) & 0x01;
bit3 = (color_prom[2*256] >> 3) & 0x01;
b = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
palette.set_indirect_color(i,rgb_t(r,g,b));
color_prom++;
}
color_prom += 2*256;
/* color_prom now points to the beginning of the lookup table */
/* characters use colors 32-47 (?) */
for (i = 0;i < m_gfxdecode->gfx(0)->colors() * m_gfxdecode->gfx(0)->granularity();i++)
palette.set_pen_indirect(m_gfxdecode->gfx(0)->colorbase() + i, 32 + *color_prom++);
/* sprites use colors 16-31 */
for (i = 0;i < m_gfxdecode->gfx(2)->colors() * m_gfxdecode->gfx(2)->granularity();i++)
palette.set_pen_indirect(m_gfxdecode->gfx(2)->colorbase() + i, 16 + *color_prom++);
/* background tiles use colors 0-15, 64-79, 128-143, 192-207 in four banks */
for (i = 0;i < m_gfxdecode->gfx(1)->colors() * m_gfxdecode->gfx(1)->granularity() / 4;i++)
{
palette.set_pen_indirect(m_gfxdecode->gfx(1)->colorbase() + 0*32*8 + i, *color_prom);
palette.set_pen_indirect(m_gfxdecode->gfx(1)->colorbase() + 1*32*8 + i, *color_prom + 64);
palette.set_pen_indirect(m_gfxdecode->gfx(1)->colorbase() + 2*32*8 + i, *color_prom + 128);
palette.set_pen_indirect(m_gfxdecode->gfx(1)->colorbase() + 3*32*8 + i, *color_prom + 192);
color_prom++;
}
}
/***************************************************************************
Callbacks for the TileMap code
***************************************************************************/
TILE_GET_INFO_MEMBER(vulgus_state::get_fg_tile_info)
{
int code, color;
code = m_fgvideoram[tile_index];
color = m_fgvideoram[tile_index + 0x400];
SET_TILE_INFO_MEMBER(0,
code + ((color & 0x80) << 1),
color & 0x3f,
0);
tileinfo.group = color & 0x3f;
}
TILE_GET_INFO_MEMBER(vulgus_state::get_bg_tile_info)
{
int code, color;
code = m_bgvideoram[tile_index];
color = m_bgvideoram[tile_index + 0x400];
SET_TILE_INFO_MEMBER(1,
code + ((color & 0x80) << 1),
(color & 0x1f) + (0x20 * m_palette_bank),
TILE_FLIPYX((color & 0x60) >> 5));
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
void vulgus_state::video_start()
{
m_fg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(vulgus_state::get_fg_tile_info),this),TILEMAP_SCAN_ROWS, 8, 8,32,32);
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(vulgus_state::get_bg_tile_info),this),TILEMAP_SCAN_COLS,16,16,32,32);
m_fg_tilemap->configure_groups(*m_gfxdecode->gfx(0), 47);
save_item(NAME(m_palette_bank));
}
/***************************************************************************
Memory handlers
***************************************************************************/
WRITE8_MEMBER(vulgus_state::fgvideoram_w)
{
m_fgvideoram[offset] = data;
m_fg_tilemap->mark_tile_dirty(offset & 0x3ff);
}
WRITE8_MEMBER(vulgus_state::bgvideoram_w)
{
m_bgvideoram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset & 0x3ff);
}
WRITE8_MEMBER(vulgus_state::c804_w)
{
/* bits 0 and 1 are coin counters */
machine().bookkeeping().coin_counter_w(0, data & 0x01);
machine().bookkeeping().coin_counter_w(1, data & 0x02);
/* bit 7 flips screen */
flip_screen_set(data & 0x80);
}
WRITE8_MEMBER(vulgus_state::palette_bank_w)
{
if (m_palette_bank != (data & 3))
{
m_palette_bank = data & 3;
m_bg_tilemap->mark_all_dirty();
}
}
/***************************************************************************
Display refresh
***************************************************************************/
void vulgus_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect)
{
gfx_element *gfx = m_gfxdecode->gfx(2);
for (int offs = m_spriteram.bytes() - 4; offs >= 0; offs -= 4)
{
int code = m_spriteram[offs];
int color = m_spriteram[offs + 1] & 0x0f;
int sy = m_spriteram[offs + 2];
int sx = m_spriteram[offs + 3];
bool flip = flip_screen() ? true : false;
int dir = 1;
if (sy == 0)
continue;
if (flip)
{
sx = 240 - sx;
sy = 240 - sy;
dir = -1;
}
// draw sprite rows (16*16, 16*32, or 16*64)
int row = (m_spriteram[offs + 1] & 0xc0) >> 6;
if (row == 2) row = 3;
for (; row >= 0; row--)
gfx->transpen(bitmap, cliprect, code + row, color, flip, flip, sx, sy + 16 * row * dir, 15);
}
}
uint32_t vulgus_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_bg_tilemap->set_scrollx(0, m_scroll_low[1] + 256 * m_scroll_high[1]);
m_bg_tilemap->set_scrolly(0, m_scroll_low[0] + 256 * m_scroll_high[0]);
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
draw_sprites(bitmap, cliprect);
m_fg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
return 0;
}