// license:BSD-3-Clause
// copyright-holders:Stefan Jokisch
/***************************************************************************
Taito Field Goal video emulation
***************************************************************************/
#include "emu.h"
#include "includes/fgoal.h"
WRITE8_MEMBER(fgoal_state::color_w)
{
m_current_color = data & 3;
}
WRITE8_MEMBER(fgoal_state::ypos_w)
{
m_ypos = data;
}
WRITE8_MEMBER(fgoal_state::xpos_w)
{
m_xpos = data;
}
void fgoal_state::video_start()
{
m_screen->register_screen_bitmap(m_fgbitmap);
m_screen->register_screen_bitmap(m_bgbitmap);
save_item(NAME(m_fgbitmap));
save_item(NAME(m_bgbitmap));
}
uint32_t fgoal_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
const uint8_t* VRAM = m_video_ram;
int x;
int y;
int n;
/* draw color overlay foreground and background */
if (m_player == 1 && (ioport("IN1")->read() & 0x40))
{
m_gfxdecode->gfx(0)->zoom_opaque(m_fgbitmap,cliprect,
0, (m_player << 2) | m_current_color,
1, 1,
0, 16,
0x40000,
0x40000);
m_gfxdecode->gfx(1)->zoom_opaque(m_bgbitmap,cliprect,
0, 0,
1, 1,
0, 16,
0x40000,
0x40000);
}
else
{
m_gfxdecode->gfx(0)->zoom_opaque(m_fgbitmap,cliprect,
0, (m_player << 2) | m_current_color,
0, 0,
0, 0,
0x40000,
0x40000);
m_gfxdecode->gfx(1)->zoom_opaque(m_bgbitmap,cliprect,
0, 0,
0, 0,
0, 0,
0x40000,
0x40000);
}
/* the ball has a fixed color */
for (y = m_ypos; y < m_ypos + 8; y++)
{
for (x = m_xpos; x < m_xpos + 8; x++)
{
if (y < 256 && x < 256)
{
m_fgbitmap.pix16(y, x) = 128 + 16;
}
}
}
/* draw bitmap layer */
for (y = 0; y < 256; y++)
{
uint16_t* p = &bitmap.pix16(y);
const uint16_t* FG = &m_fgbitmap.pix16(y);
const uint16_t* BG = &m_bgbitmap.pix16(y);
for (x = 0; x < 256; x += 8)
{
uint8_t v = *VRAM++;
for (n = 0; n < 8; n++)
{
if (v & (1 << n))
{
p[x + n] = FG[x + n];
}
else
{
p[x + n] = BG[x + n];
}
}
}
}
return 0;
}