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// license:BSD-3-Clause
// copyright-holders:Phil Stroffolino
/* video/namconb1.c */

#include "emu.h"
#include "includes/namconb1.h"

/* nth_word32 is a general-purpose utility function, which allows us to
 * read from 32-bit aligned memory as if it were an array of 16 bit words.
 */
static inline uint16_t
nth_word32( const uint32_t *source, int which )
{
	source += which/2;
	if( which&1 )
	{
		return (*source)&0xffff;
	}
	else
	{
		return (*source)>>16;
	}
}

/* nth_byte32 is a general-purpose utility function, which allows us to
 * read from 32-bit aligned memory as if it were an array of bytes.
 */
static inline uint8_t
nth_byte32( const uint32_t *pSource, int which )
{
	uint32_t data = pSource[which/4];
	switch( which&3 )
	{
	case 0: return data>>24;
	case 1: return (data>>16)&0xff;
	case 2: return (data>>8)&0xff;
	default: return data&0xff;
	}
} /* nth_byte32 */

void namconb1_state::NB1TilemapCB(uint16_t code, int *tile, int *mask)
{
	*tile = code;
	*mask = code;
} /* NB1TilemapCB */

void namconb1_state::NB2TilemapCB_machbrkr(uint16_t code, int *tile, int *mask )
{
	/*  00010203 04050607 00010203 04050607 (normal) */
	/*  00010718 191a1b07 00010708 090a0b07 (alt bank) */
	int bank = nth_byte32( m_tilebank32, (code>>13)+8 );
	int mangle = (code&0x1fff) | (bank<<13);
	*tile = mangle;
	*mask = mangle;

} /* NB2TilemapCB_machbrkr */

void namconb1_state::NB2TilemapCB_outfxies(uint16_t code, int *tile, int *mask )
{
	/* the pixmap index is mangled, the transparency bitmask index is not */
	*tile = bitswap<16>(code, 15, 14, 13, 12, 11, 10, 9, 6, 7, 8, 5, 4, 3, 2, 1, 0);
	*mask = code;

} /* NB2TilemapCB_outfxies */

void namconb1_state::NB2RozCB_machbrkr(uint16_t code, int *tile, int *mask, int which )
{
	int bank = nth_byte32(&m_rozbank32[which * 8 / 4], (code >> 11) & 0x7);
	int mangle = (code & 0x7ff) | (bank << 11);
	*tile = mangle;
	*mask = mangle;

} /* NB2RozCB_machbrkr */

void namconb1_state::NB2RozCB_outfxies(uint16_t code, int *tile, int *mask, int which )
{
	/* the pixmap index is mangled, the transparency bitmask index is not */
	int bank = nth_byte32(&m_rozbank32[which * 8 / 4], (code >> 11) & 0x7);
	int mangle = (code & 0x7ff) | (bank << 11);
	*mask = mangle;
	mangle = bitswap<19>(mangle & 0x7ffff, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 4, 5, 6, 3, 2, 1, 0);
	*tile = mangle;

} /* NB2RozCB_outfxies */

void namconb1_state::video_update_common(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect, int bROZ )
{
	int pri;

	if( bROZ )
	{
		for( pri=0; pri<16; pri++ )
		{
			m_c169roz->draw(screen, bitmap, cliprect, pri);
			if ((pri & 1) == 0)
			{
				m_c123tmap->draw( screen, bitmap, cliprect, pri/2 );
			}
			m_c355spr->draw(screen, bitmap, cliprect, pri );
		}
	}
	else
	{
		for( pri=0; pri<8; pri++ )
		{
			m_c123tmap->draw( screen, bitmap, cliprect, pri );
			m_c355spr->draw(screen, bitmap, cliprect, pri );
		}
	}
} /* video_update_common */

/************************************************************************************************/

uint32_t namconb1_state::screen_update_namconb1(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	/* compute window for custom screen blanking */
	rectangle clip;
	//004a 016a 0021 0101 0144 0020 (nebulas ray)
	clip.min_x = m_c116->get_reg(0) - 0x4a;
	clip.max_x = m_c116->get_reg(1) - 0x4a - 1;
	clip.min_y = m_c116->get_reg(2) - 0x21;
	clip.max_y = m_c116->get_reg(3) - 0x21 - 1;
	/* intersect with master clip rectangle */
	clip &= cliprect;

	bitmap.fill(m_palette->black_pen(), cliprect );

	video_update_common( screen, bitmap, clip, 0 );

	return 0;
}

int namconb1_state::NB1objcode2tile( int code )
{
	int bank = nth_word32( m_spritebank32, code>>11 );
	return (code&0x7ff) | (bank<<11);
}

VIDEO_START_MEMBER(namconb1_state,namconb1)
{
	save_item(NAME(m_tilemap_tile_bank));
} /* namconb1 */

/****************************************************************************************************/

WRITE32_MEMBER(namconb1_state::rozbank32_w)
{
	uint32_t old_data = m_rozbank32[offset];
	COMBINE_DATA(&m_rozbank32[offset]);
	if (m_rozbank32[offset] != old_data)
		m_c169roz->mark_all_dirty();
}

uint32_t namconb1_state::screen_update_namconb2(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	/* compute window for custom screen blanking */
	rectangle clip;
	//004a016a 00210101 01440020
	clip.min_x = m_c116->get_reg(0) - 0x4b;
	clip.max_x = m_c116->get_reg(1) - 0x4b - 1;
	clip.min_y = m_c116->get_reg(2) - 0x21;
	clip.max_y = m_c116->get_reg(3) - 0x21 - 1;
	/* intersect with master clip rectangle */
	clip &= cliprect;

	bitmap.fill(m_palette->black_pen(), cliprect );

	if( memcmp(m_tilemap_tile_bank,m_tilebank32,sizeof(m_tilemap_tile_bank))!=0 )
	{
		m_c123tmap->mark_all_dirty();
		memcpy(m_tilemap_tile_bank,m_tilebank32,sizeof(m_tilemap_tile_bank));
	}
	video_update_common( screen, bitmap, clip, 1 );
	return 0;
}

int namconb1_state::NB2objcode2tile_machbrkr( int code )
{
	int bank = nth_byte32( m_spritebank32, (code>>11)&0xf );
	code &= 0x7ff;
	code |= bitswap<6>(bank & 0x5f, 6, 4, 3, 2, 1, 0) << 11;
	return code;
} /* NB2objcode2tile_machbrkr */

int namconb1_state::NB2objcode2tile_outfxies( int code )
{
	int bank = nth_byte32( m_spritebank32, (code>>11)&0xf );
	code &= 0x7ff;
	code |= bitswap<6>(bank & 0x5f, 6, 4, 3, 1, 2, 0) << 11;
	return code;
} /* NB2objcode2tile_outfxies */

VIDEO_START_MEMBER(namconb1_state,machbrkr)
{
	save_item(NAME(m_tilemap_tile_bank));
} /* machbrkr */

VIDEO_START_MEMBER(namconb1_state,outfxies)
{
	save_item(NAME(m_tilemap_tile_bank));
} /* outfxies */