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path: root/src/mame/video/namcos2_sprite.cpp
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// license:BSD-3-Clause
// copyright-holders:David Haywood, Phil Stroffolino

/*
    Namco System 2 Sprites - found on Namco System 2 video board (standard type)

    based on namcoic.txt this probably consists of the following
    C106 - Generates memory output clocks to generate X-Axis Zoom for Line Buffer Writes
    C134 - Object Memory Address Generator. Sequences the sprite memory contents to the hardware.
    C135 - Checks is object is displayed on Current output line.
    C146 - Steers the Decode Object Pixel data to the correct line buffer A or B

    Metal Hawk requires a different draw function, so might use a different chip unless the hookup is just scrambled (needs checking)

    used by the following drivers
    namcos2.cpp (all games EXCEPT Steel Gunner, Steel Gunner 2, Lucky & Wild, Suzuka 8 Hours, Suzuka 8 Hours 2 which use the newer Namco NB1 style sprites, see namco_c355spr.cpp)


*/

#include "emu.h"
#include "namcos2_sprite.h"

DEFINE_DEVICE_TYPE(NAMCOS2_SPRITE, namcos2_sprite_device, "namcos2_sprite", "Namco System 2 Sprites (C106,C134,C135,C146)")

namcos2_sprite_device::namcos2_sprite_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) :
	device_t(mconfig, NAMCOS2_SPRITE, tag, owner, clock),
	m_gfxdecode(*this, finder_base::DUMMY_TAG),
	m_palette(*this, finder_base::DUMMY_TAG),
	m_spriteram(*this, finder_base::DUMMY_TAG)
{
}

void namcos2_sprite_device::device_start()
{
}

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

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

void namcos2_sprite_device::zdrawgfxzoom(
		screen_device &screen,
		bitmap_ind16 &dest_bmp,const rectangle &clip,gfx_element *gfx,
		uint32_t code,uint32_t color,int flipx,int flipy,int sx,int sy,
		int scalex, int scaley, int zpos )
{
	if (!scalex || !scaley) return;
	if (dest_bmp.bpp() == 16)
	{
		if( gfx )
		{
			int shadow_offset = (m_palette->shadows_enabled())?m_palette->entries():0;
			const pen_t *pal = &m_palette->pen(gfx->colorbase() + gfx->granularity() * (color % gfx->colors()));
			const uint8_t *source_base = gfx->get_data(code % gfx->elements());
			int sprite_screen_height = (scaley*gfx->height()+0x8000)>>16;
			int sprite_screen_width = (scalex*gfx->width()+0x8000)>>16;
			if (sprite_screen_width && sprite_screen_height)
			{
				/* compute sprite increment per screen pixel */
				int dx = (gfx->width()<<16)/sprite_screen_width;
				int dy = (gfx->height()<<16)/sprite_screen_height;

				int ex = sx+sprite_screen_width;
				int ey = sy+sprite_screen_height;

				int x_index_base;
				int y_index;

				if( flipx )
				{
					x_index_base = (sprite_screen_width-1)*dx;
					dx = -dx;
				}
				else
				{
					x_index_base = 0;
				}

				if( flipy )
				{
					y_index = (sprite_screen_height-1)*dy;
					dy = -dy;
				}
				else
				{
					y_index = 0;
				}

				if( sx < clip.min_x)
				{ /* clip left */
					int pixels = clip.min_x-sx;
					sx += pixels;
					x_index_base += pixels*dx;
				}
				if( sy < clip.min_y )
				{ /* clip top */
					int pixels = clip.min_y-sy;
					sy += pixels;
					y_index += pixels*dy;
				}
				if( ex > clip.max_x+1 )
				{ /* clip right */
					int pixels = ex-clip.max_x-1;
					ex -= pixels;
				}
				if( ey > clip.max_y+1 )
				{ /* clip bottom */
					int pixels = ey-clip.max_y-1;
					ey -= pixels;
				}

				if( ex>sx )
				{ /* skip if inner loop doesn't draw anything */
					int y;
					bitmap_ind8 &priority_bitmap = screen.priority();
					if( priority_bitmap.valid() )
					{
						for( y=sy; y<ey; y++ )
						{
							const uint8_t *source = source_base + (y_index>>16) * gfx->rowbytes();
							uint16_t *dest = &dest_bmp.pix16(y);
							uint8_t *pri = &priority_bitmap.pix8(y);
							int x, x_index = x_index_base;
							/* this code was previously shared with the c355 where this was needed
							if( m_palxor )
							{
							    for( x=sx; x<ex; x++ )
							    {
							        int c = source[x_index>>16];
							        if( c != 0xff )
							        {
							            if( pri[x]<=zpos )
							            {
							                switch( c )
							                {
							                case 0:
							                    dest[x] = 0x4000|(dest[x]&0x1fff);
							                    break;
							                case 1:
							                    dest[x] = 0x6000|(dest[x]&0x1fff);
							                    break;
							                default:
							                    dest[x] = pal[c];
							                    break;
							                }
							                pri[x] = zpos;
							            }
							        }
							        x_index += dx;
							    }
							    y_index += dy;
							}
							else
							*/
							{
								for( x=sx; x<ex; x++ )
								{
									int c = source[x_index>>16];
									if( c != 0xff )
									{
										if( pri[x]<=zpos )
										{
											if( color == 0xf && c==0xfe && shadow_offset )
											{
												dest[x] |= shadow_offset;
											}
											else
											{
												dest[x] = pal[c];
											}
											pri[x] = zpos;
										}
									}
									x_index += dx;
								}
								y_index += dy;
							}
						}
					}
				}
			}
		}
	}
} /* zdrawgfxzoom */

void namcos2_sprite_device::zdrawgfxzoom(
		screen_device &screen,
		bitmap_rgb32 &dest_bmp,const rectangle &clip,gfx_element *gfx,
		uint32_t code,uint32_t color,int flipx,int flipy,int sx,int sy,
		int scalex, int scaley, int zpos )
{
	/* nop */
}

void namcos2_sprite_device::draw_sprites(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect, int pri, int control )
{
	int offset = (control & 0x000f) * (128*4);
	int loop;
	if( pri==0 )
	{
		screen.priority().fill(0, cliprect );
	}
	for( loop=0; loop < 128; loop++ )
	{
		/****************************************
		* word#0
		*   Sprite Y position           D00-D08
		*   Sprite Size 16/32           D09
		*   Sprite Size Y               D10-D15
		*
		* word#1
		*   Sprite Quadrant             D00-D01
		*   Sprite Number               D02-D12
		*   Sprite ROM Bank select      D13
		*   Sprite flip X               D14
		*   Sprite flip Y               D15
		*
		* word#2
		*   Sprite X position           D00-D10
		*
		* word#3
		*   Sprite priority             D00-D02
		*   Sprite colour index         D04-D07
		*   Sprite Size X               D10-D15
		*/
		int word3 = m_spriteram[offset+(loop*4)+3];
		if( (word3&0xf)==pri )
		{
			int word0 = m_spriteram[offset+(loop*4)+0];
			int word1 = m_spriteram[offset+(loop*4)+1];
			int offset4 = m_spriteram[offset+(loop*4)+2];

			int sizey=((word0>>10)&0x3f)+1;
			int sizex=(word3>>10)&0x3f;

			if((word0&0x0200)==0) sizex>>=1;

			if((sizey-1) && sizex )
			{
				int color  = (word3>>4)&0x000f;
				int sprn   = (word1>>2)&0x7ff;
				int rgn    = (word1&0x2000)?1:0;
				int ypos   = (0x1ff-(word0&0x01ff))-0x50+0x02;
				int xpos   = (offset4&0x03ff)-0x50+0x07;
				int flipy  = word1&0x8000;
				int flipx  = word1&0x4000;
				int scalex = (sizex<<16)/((word0&0x0200)?0x20:0x10);
				int scaley = (sizey<<16)/((word0&0x0200)?0x20:0x10);
				if(scalex && scaley)
				{
					gfx_element *gfx = m_gfxdecode->gfx(rgn);

					if( (word0&0x0200)==0 )
						gfx->set_source_clip((word1&0x0001) ? 16 : 0, 16, (word1&0x0002) ? 16 : 0, 16);
					else
						gfx->set_source_clip(0, 32, 0, 32);

					zdrawgfxzoom(
						screen,
						bitmap,
						cliprect,
						gfx,
						sprn,
						color,
						flipx,flipy,
						xpos,ypos,
						scalex,scaley,
						loop );
				}
			}
		}
	}
} /* namcos2_draw_sprites */

void namcos2_sprite_device::draw_sprites_metalhawk(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect, int pri )
{
	/**
	 * word#0
	 *  xxxxxx---------- ysize
	 *  ------x--------- sprite tile size
	 *  -------xxxxxxxxx screeny
	 *
	 * word#1
	 *  --x------------- bank
	 *  ----xxxxxxxxxxxx tile
	 *
	 * word#2 (unused)
	 *
	 * word#3
	 *  xxxxxx---------- xsize
	 *  ------xxxxxxxxxx screenx
	 *
	 * word#4 (unused)
	 * word#5 (unused)
	 *
	 * word#6 (orientation)
	 *  ---------------x rot90
	 *  --------------x- flipx
	 *  -------------x-- flipy
	 *  ------------x--- tile size
	 *
	 * word#7
	 *  ------------xxxx priority
	 *  --------xxxx---- color
	 *  x--------------- unknown
	 */
	const uint16_t *pSource = m_spriteram;
	int loop;
	if( pri==0 )
	{
		screen.priority().fill(0, cliprect );
	}
	for( loop=0; loop < 128; loop++ )
	{
		int ypos  = pSource[0];
		int tile  = pSource[1];
		int xpos  = pSource[3];
		int flags = pSource[6];
		int attrs = pSource[7];
		int sizey = ((ypos>>10)&0x3f)+1;
		int sizex = (xpos>>10)&0x3f;
		int sprn  = (tile>>2)&0x7ff;

		if( tile&0x2000 )
		{
			sprn&=0x3ff;
		}
		else
		{
			sprn|=0x400;
		}

		if( (sizey-1) && sizex && (attrs&0xf)==pri )
		{
			int bBigSprite = (flags&8);
			int color = (attrs>>4)&0xf;
			int sx = (xpos&0x03ff)-0x50+0x07;
			int sy = (0x1ff-(ypos&0x01ff))-0x50+0x02;
			int flipx = flags&2;
			int flipy = flags&4;
			int scalex = (sizex<<16)/(0x20);//(sizex<<16)/(bBigSprite?0x20:0x10); correct formula?
			int scaley = (sizey<<16)/(bBigSprite?0x20:0x10);

			/* swap xy */
			int rgn = (flags&0x01) ? 3 : 0;

			gfx_element *gfx = m_gfxdecode->gfx(rgn);

			if( bBigSprite )
			{
				if( sizex < 0x20 )
				{
					sx -= (0x20-sizex)/0x8;
				}
				if( sizey < 0x20 )
				{
					sy += (0x20-sizey)/0xC;
				}
				gfx->set_source_clip(0, 32, 0, 32);
			}
			else
				gfx->set_source_clip((tile&0x0001) ? 16 : 0, 16, (tile&0x0002) ? 16 : 0, 16);

			zdrawgfxzoom(
				screen,
				bitmap,
				cliprect,
				gfx,
				sprn, color,
				flipx,flipy,
				sx,sy,
				scalex, scaley,
				loop );
		}
		pSource += 8;
	}
} /* namcos2_draw_sprites_metalhawk */