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// license:BSD-3-Clause
// copyright-holders:Sebastien Monassa
/*************************************************************************
Atari Video Pinball video emulation
*************************************************************************/
#include "emu.h"
#include "includes/videopin.h"
TILEMAP_MAPPER_MEMBER(videopin_state::get_memory_offset)
{
return num_rows * ((col + 16) % 48) + row;
}
TILE_GET_INFO_MEMBER(videopin_state::get_tile_info)
{
uint8_t code = m_video_ram[tile_index];
SET_TILE_INFO_MEMBER(0, code, 0, (code & 0x40) ? TILE_FLIPY : 0);
}
void videopin_state::video_start()
{
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(videopin_state::get_tile_info),this), tilemap_mapper_delegate(FUNC(videopin_state::get_memory_offset),this), 8, 8, 48, 32);
save_item(NAME(m_ball_x));
save_item(NAME(m_ball_y));
}
uint32_t videopin_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
int col;
int row;
m_bg_tilemap->set_scrollx(0, -8); /* account for delayed loading of shift reg C6 */
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
for (row = 0; row < 32; row++)
{
for (col = 0; col < 48; col++)
{
uint32_t offset = m_bg_tilemap->memory_index(col, row);
if (m_video_ram[offset] & 0x80) /* ball bit found */
{
int x = 8 * col;
int y = 8 * row;
int i;
int j;
x += 4; /* account for delayed loading of flip-flop C4 */
rectangle rect(x, x + 15, y, y + 15);
rect &= cliprect;
x -= m_ball_x;
y -= m_ball_y;
/* ball placement is still 0.5 pixels off but don't tell anyone */
for (i = 0; i < 2; i++)
{
for (j = 0; j < 2; j++)
{
m_gfxdecode->gfx(1)->transpen(bitmap,rect,
0, 0,
0, 0,
x + 16 * i,
y + 16 * j, 0);
}
}
return 0; /* keep things simple and ignore the rest */
}
}
}
return 0;
}
WRITE8_MEMBER(videopin_state::ball_w)
{
m_ball_x = data & 15;
m_ball_y = data >> 4;
}
WRITE8_MEMBER(videopin_state::video_ram_w)
{
m_video_ram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset);
}
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