// license:BSD-3-Clause
// copyright-holders:Carlos A. Lozano
/***************************************************************************
cabal.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "emu.h"
#include "includes/cabal.h"
TILE_GET_INFO_MEMBER(cabal_state::get_back_tile_info)
{
int tile = m_videoram[tile_index];
int color = (tile>>12)&0xf;
tile &= 0xfff;
SET_TILE_INFO_MEMBER(1,
tile,
color,
0);
}
TILE_GET_INFO_MEMBER(cabal_state::get_text_tile_info)
{
int tile = m_colorram[tile_index];
int color = (tile>>10);
tile &= 0x3ff;
SET_TILE_INFO_MEMBER(0,
tile,
color,
0);
}
void cabal_state::video_start()
{
m_background_layer = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(cabal_state::get_back_tile_info),this),TILEMAP_SCAN_ROWS,16,16,16,16);
m_text_layer = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(cabal_state::get_text_tile_info),this),TILEMAP_SCAN_ROWS, 8,8,32,32);
m_text_layer->set_transparent_pen(3);
m_background_layer->set_transparent_pen(15);
}
/**************************************************************************/
WRITE16_MEMBER(cabal_state::flipscreen_w)
{
if (ACCESSING_BITS_0_7)
{
int flip = (data & 0x20) ? (TILEMAP_FLIPX | TILEMAP_FLIPY) : 0;
m_background_layer->set_flip(flip);
m_text_layer->set_flip(flip);
flip_screen_set(data & 0x20);
}
}
WRITE16_MEMBER(cabal_state::background_videoram_w)
{
COMBINE_DATA(&m_videoram[offset]);
m_background_layer->mark_tile_dirty(offset);
}
WRITE16_MEMBER(cabal_state::text_videoram_w)
{
COMBINE_DATA(&m_colorram[offset]);
m_text_layer->mark_tile_dirty(offset);
}
/********************************************************************
Cabal Spriteram
---------------
+0 .......x ........ Sprite enable bit
+0 ........ xxxxxxxx Sprite Y coordinate
+1 ..??.... ........ ??? unknown ???
+1 ....xxxx xxxxxxxx Sprite tile number
+2 .xxxx... ........ Sprite color bank
+2 .....x.. ........ Sprite flip x
+2 .......x xxxxxxxx Sprite X coordinate
+3 (unused)
-------E YYYYYYYY
----BBTT TTTTTTTT
-CCCCF-X XXXXXXXX
-------- --------
********************************************************************/
void cabal_state::draw_sprites(bitmap_ind16 &bitmap, const rectangle &cliprect)
{
int offs,data0,data1,data2;
for( offs = m_spriteram.bytes()/2 - 4; offs >= 0; offs -= 4 )
{
data0 = m_spriteram[offs];
data1 = m_spriteram[offs+1];
data2 = m_spriteram[offs+2];
if( data0 & 0x100 )
{
int tile_number = data1 & 0xfff;
int color = ( data2 & 0x7800 ) >> 11;
int sy = ( data0 & 0xff );
int sx = ( data2 & 0x1ff );
int flipx = ( data2 & 0x0400 );
int flipy = 0;
if ( sx>256 ) sx -= 512;
if (flip_screen())
{
sx = 240 - sx;
sy = 240 - sy;
flipx = !flipx;
flipy = !flipy;
}
m_gfxdecode->gfx(2)->transpen(bitmap,cliprect,
tile_number,
color,
flipx,flipy,
sx,sy,0xf );
}
}
}
uint32_t cabal_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_background_layer->draw(screen, bitmap, cliprect, TILEMAP_DRAW_OPAQUE,0);
draw_sprites(bitmap,cliprect);
m_text_layer->draw(screen, bitmap, cliprect, 0,0);
return 0;
}