/* video/namconb1.c */

#include "emu.h"
#include "includes/namconb1.h"
#include "includes/namcoic.h"
#include "includes/namcos2.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.
 */
INLINE UINT16
nth_word32( const UINT32 *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.
 */
INLINE UINT8
nth_byte32( const UINT32 *pSource, int which )
{
	UINT32 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 */

static void
NB1TilemapCB(running_machine &machine, UINT16 code, int *tile, int *mask )
{
	*tile = code;
	*mask = code;
} /* NB1TilemapCB */

static void
NB2TilemapCB(running_machine &machine, UINT16 code, int *tile, int *mask )
{
	namconb1_state *state = machine.driver_data<namconb1_state>();
	int mangle;

	if( namcos2_gametype == NAMCONB2_MACH_BREAKERS )
	{
		/*  00010203 04050607 00010203 04050607 (normal) */
		/*  00010718 191a1b07 00010708 090a0b07 (alt bank) */
		int bank = nth_byte32( state->m_tilebank32, (code>>13)+8 );
		mangle = (code&0x1fff) + bank*0x2000;
		*tile = mangle;
		*mask = mangle;
	}
	else
	{
		/* the pixmap index is mangled, the transparency bitmask index is not */
		mangle = code&~(0x140);
		if( code&0x100 ) mangle |= 0x040;
		if( code&0x040 ) mangle |= 0x100;
		*tile = mangle;
		*mask = code;
	}
} /* NB2TilemapCB */

static void namconb1_install_palette(running_machine &machine)
{
	namconb1_state *state = machine.driver_data<namconb1_state>();
	int pen, page, dword_offset, byte_offset;
	UINT32 r,g,b;
	UINT32 *pSource;

	/**
     * This is unnecessarily expensive.  Better would be to mark palette entries dirty as
     * they are modified, and only process those that have changed.
     */
	pen = 0;
	for( page=0; page<4; page++ )
	{
		pSource = &state->m_generic_paletteram_32[page*0x2000/4];
		for( dword_offset=0; dword_offset<0x800/4; dword_offset++ )
		{
			r = pSource[dword_offset+0x0000/4];
			g = pSource[dword_offset+0x0800/4];
			b = pSource[dword_offset+0x1000/4];

			for( byte_offset=0; byte_offset<4; byte_offset++ )
			{
				palette_set_color_rgb( machine, pen++, r>>24, g>>24, b>>24 );
				r<<=8; g<<=8; b<<=8;
			}
		}
	}
} /* namconb1_install_palette */

static void
video_update_common(running_machine &machine, bitmap_ind16 &bitmap, const rectangle &cliprect, int bROZ )
{
	int pri;
	namconb1_install_palette(machine);

	if( bROZ )
	{
		for( pri=0; pri<16; pri++ )
		{
			namco_roz_draw( bitmap,cliprect,pri );
			if( (pri&1)==0 )
			{
				namco_tilemap_draw( bitmap, cliprect, pri/2 );
			}
			namco_obj_draw(machine, bitmap, cliprect, pri );
		}
	}
	else
	{
		for( pri=0; pri<8; pri++ )
		{
			namco_tilemap_draw( bitmap, cliprect, pri );
			namco_obj_draw(machine, bitmap, cliprect, pri );
		}
	}
} /* video_update_common */

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

SCREEN_UPDATE_IND16( namconb1 )
{
	/* compute window for custom screen blanking */
	rectangle clip;
	//004a 016a 0021 0101 0144 0020 (nebulas ray)
	namconb1_state *state = screen.machine().driver_data<namconb1_state>();
	UINT32 xclip = state->m_generic_paletteram_32[0x1800/4];
	UINT32 yclip = state->m_generic_paletteram_32[0x1804/4];
	clip.min_x = (xclip>>16)    - 0x4a;
	clip.max_x = (xclip&0xffff) - 0x4a - 1;
	clip.min_y = (yclip>>16)    - 0x21;
	clip.max_y = (yclip&0xffff) - 0x21 - 1;
	/* intersect with master clip rectangle */
	clip &= cliprect;

	bitmap.fill(get_black_pen(screen.machine()), cliprect );

	video_update_common( screen.machine(), bitmap, clip, 0 );

	return 0;
}

static int
NB1objcode2tile( running_machine &machine, int code )
{
	namconb1_state *state = machine.driver_data<namconb1_state>();
	int bank = nth_word32( state->m_spritebank32, code>>11 );
	return (code&0x7ff) + bank*0x800;
}

VIDEO_START( namconb1 )
{
	namco_tilemap_init( machine, NAMCONB1_TILEGFX, machine.root_device().memregion(NAMCONB1_TILEMASKREGION)->base(), NB1TilemapCB );
	namco_obj_init(machine,NAMCONB1_SPRITEGFX,0x0,NB1objcode2tile);
} /* namconb1 */

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

SCREEN_UPDATE_IND16( namconb2 )
{
	namconb1_state *state = screen.machine().driver_data<namconb1_state>();
	/* compute window for custom screen blanking */
	rectangle clip;
	//004a016a 00210101 01440020
	UINT32 xclip = state->m_generic_paletteram_32[0x1800/4];
	UINT32 yclip = state->m_generic_paletteram_32[0x1804/4];
	clip.min_x = (xclip>>16)    - 0x4b;
	clip.max_x = (xclip&0xffff) - 0x4b - 1;
	clip.min_y = (yclip>>16)    - 0x21;
	clip.max_y = (yclip&0xffff) - 0x21 - 1;
	/* intersect with master clip rectangle */
	clip &= cliprect;

	bitmap.fill(get_black_pen(screen.machine()), cliprect );

	if( memcmp(state->m_tilemap_tile_bank,state->m_tilebank32,sizeof(state->m_tilemap_tile_bank))!=0 )
	{
		namco_tilemap_invalidate();
		memcpy(state->m_tilemap_tile_bank,state->m_tilebank32,sizeof(state->m_tilemap_tile_bank));
	}
	video_update_common( screen.machine(), bitmap, clip, 1 );
	return 0;
}

static int
NB2objcode2tile( running_machine &machine, int code )
{
	namconb1_state *state = machine.driver_data<namconb1_state>();
	int bank = nth_byte32( state->m_spritebank32, (code>>11)&0xf );
	code &= 0x7ff;
	if( namcos2_gametype == NAMCONB2_MACH_BREAKERS )
	{
		if( bank&0x01 ) code |= 0x01*0x800;
		if( bank&0x02 ) code |= 0x02*0x800;
		if( bank&0x04 ) code |= 0x04*0x800;
		if( bank&0x08 ) code |= 0x08*0x800;
		if( bank&0x10 ) code |= 0x10*0x800;
		if( bank&0x40 ) code |= 0x20*0x800;
	}
	else
	{
		if( bank&0x01 ) code |= 0x01*0x800;
		if( bank&0x02 ) code |= 0x04*0x800;
		if( bank&0x04 ) code |= 0x02*0x800;
		if( bank&0x08 ) code |= 0x08*0x800;
		if( bank&0x10 ) code |= 0x10*0x800;
		if( bank&0x40 ) code |= 0x20*0x800;
	}
	return code;
} /* NB2objcode2tile */

VIDEO_START( namconb2 )
{
	namco_tilemap_init(machine, NAMCONB1_TILEGFX, machine.root_device().memregion(NAMCONB1_TILEMASKREGION)->base(), NB2TilemapCB );
	namco_obj_init(machine,NAMCONB1_SPRITEGFX,0x0,NB2objcode2tile);
	namco_roz_init(machine, NAMCONB1_ROTGFX,NAMCONB1_ROTMASKREGION);
} /* namconb2_vh_start */
