// license:BSD-3-Clause
// copyright-holders:Paul Leaman
/***************************************************************************
Battle Lane Vol. 5
***************************************************************************/
#include "emu.h"
#include "includes/battlane.h"
/*
Video control register
0x80 = low bit of blue component (taken when writing to palette)
0x0e = Bitmap plane (bank?) select (0-7)
0x01 = Scroll MSB
*/
WRITE8_MEMBER(battlane_state::battlane_palette_w)
{
int r, g, b;
int bit0, bit1, bit2;
/* red component */
bit0 = (~data >> 0) & 0x01;
bit1 = (~data >> 1) & 0x01;
bit2 = (~data >> 2) & 0x01;
r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* green component */
bit0 = (~data >> 3) & 0x01;
bit1 = (~data >> 4) & 0x01;
bit2 = (~data >> 5) & 0x01;
g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* blue component */
bit0 = (~m_video_ctrl >> 7) & 0x01;
bit1 = (~data >> 6) & 0x01;
bit2 = (~data >> 7) & 0x01;
b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
m_palette->set_pen_color(offset, rgb_t(r, g, b));
}
WRITE8_MEMBER(battlane_state::battlane_scrollx_w)
{
m_bg_tilemap->set_scrollx(0, ((m_video_ctrl & 0x01) << 8) + data);
}
WRITE8_MEMBER(battlane_state::battlane_scrolly_w)
{
m_bg_tilemap->set_scrolly(0, ((m_cpu_control & 0x01) << 8) + data);
}
WRITE8_MEMBER(battlane_state::battlane_tileram_w)
{
m_tileram[offset] = data;
//m_bg_tilemap->mark_tile_dirty(offset);
}
WRITE8_MEMBER(battlane_state::battlane_spriteram_w)
{
m_spriteram[offset] = data;
}
WRITE8_MEMBER(battlane_state::battlane_bitmap_w)
{
int i, orval;
orval = (~m_video_ctrl >> 1) & 0x07;
if (!orval)
orval = 7;
for (i = 0; i < 8; i++)
{
if (data & 1 << i)
{
m_screen_bitmap.pix8(offset % 0x100, (offset / 0x100) * 8 + i) |= orval;
}
else
{
m_screen_bitmap.pix8(offset % 0x100, (offset / 0x100) * 8 + i) &= ~orval;
}
}
}
WRITE8_MEMBER(battlane_state::battlane_video_ctrl_w)
{
m_video_ctrl = data;
}
TILE_GET_INFO_MEMBER(battlane_state::get_tile_info_bg)
{
int code = m_tileram[tile_index];
int attr = m_tileram[tile_index + 0x400];
int gfxn = (attr & 0x01) + 1;
int color = (attr >> 1) & 0x03;
SET_TILE_INFO_MEMBER(gfxn, code, color, 0);
}
TILEMAP_MAPPER_MEMBER(battlane_state::battlane_tilemap_scan_rows_2x2)
{
/*
Tilemap Memory Organization
0 15 16 31
+-----------------+----------------+
|0 15|256 |0
| | |
| screen 0 | screen 1 |
| | |
|240 255| 511|15
+-----------------+----------------+
|512 |768 |16
| | |
| screen 2 | screen 3 |
| | |
| 767| 1023|31
+-----------------+-----------------
*/
return (row & 0xf) * 16 + (col & 0xf) + (row & 0x10) * 32 + (col & 0x10) * 16;
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
void battlane_state::video_start()
{
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(battlane_state::get_tile_info_bg),this), tilemap_mapper_delegate(FUNC(battlane_state::battlane_tilemap_scan_rows_2x2),this), 16, 16, 32, 32);
m_screen_bitmap.allocate(32 * 8, 32 * 8);
save_item(NAME(m_screen_bitmap));
}
void battlane_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect )
{
int offs, attr, code, color, sx, sy, flipx, flipy, dy;
for (offs = 0; offs < 0x100; offs += 4)
{
/*
0x80 = Bank 2
0x40 =
0x20 = Bank 1
0x10 = Y Double
0x08 = Color
0x04 = X Flip
0x02 = Y Flip
0x01 = Sprite Enable
*/
attr = m_spriteram[offs + 1];
code = m_spriteram[offs + 3];
code += 256 * ((attr >> 6) & 0x02);
code += 256 * ((attr >> 5) & 0x01);
if (attr & 0x01)
{
color = (attr >> 3) & 0x01;
sx = m_spriteram[offs + 2];
sy = m_spriteram[offs];
flipx = attr & 0x04;
flipy = attr & 0x02;
if (!flip_screen())
{
sx = 240 - sx;
sy = 240 - sy;
flipx = !flipx;
flipy = !flipy;
}
m_gfxdecode->gfx(0)->transpen(bitmap,cliprect,
code,
color,
flipx, flipy,
sx, sy, 0);
if (attr & 0x10) /* Double Y direction */
{
dy = flipy ? 16 : -16;
m_gfxdecode->gfx(0)->transpen(bitmap,cliprect,
code + 1,
color,
flipx, flipy,
sx, sy + dy, 0);
}
}
}
}
void battlane_state::draw_fg_bitmap( bitmap_ind16 &bitmap )
{
int x, y, data;
for (y = 0; y < 32 * 8; y++)
{
for (x = 0; x < 32 * 8; x++)
{
data = m_screen_bitmap.pix8(y, x);
if (data)
{
if (flip_screen())
bitmap.pix16(255 - y, 255 - x) = data;
else
bitmap.pix16(y, x) = data;
}
}
}
}
uint32_t battlane_state::screen_update_battlane(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_bg_tilemap->mark_all_dirty(); // HACK
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
draw_sprites(bitmap, cliprect);
draw_fg_bitmap(bitmap);
return 0;
}