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path: root/src/mame/video/gaelco.cpp
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// license:BSD-3-Clause
// copyright-holders:Manuel Abadia
/***************************************************************************

  Gaelco Type 1 Video Hardware

  Functions to emulate the video hardware of the machine

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

#include "emu.h"
#include "includes/gaelco.h"
#include "screen.h"

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

    Callbacks for the TileMap code

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

/*
    Tile format
    -----------

    Screen 0 & 1: (32*32, 16x16 tiles)

    Word | Bit(s)            | Description
    -----+-FEDCBA98-76543210-+--------------------------
      0  | -------- -------x | flip x
      0  | -------- ------x- | flip y
      0  | xxxxxxxx xxxxxx-- | code
      1  | -------- --xxxxxx | color
      1  | -------- xx------ | priority
      1  | xxxxxxxx -------- | not used
*/

template<int Layer>
TILE_GET_INFO_MEMBER(gaelco_state::get_tile_info)
{
	int data = m_videoram[(Layer * 0x1000 / 2) + (tile_index << 1)];
	int data2 = m_videoram[(Layer * 0x1000 / 2) + (tile_index << 1) + 1];
	int code = ((data & 0xfffc) >> 2);

	tileinfo.category = (data2 >> 6) & 0x03;

	SET_TILE_INFO_MEMBER(1, 0x4000 + code, data2 & 0x3f, TILE_FLIPYX(data & 0x03));
}

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

    Memory Handlers

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

void gaelco_state::vram_w(offs_t offset, u16 data, u16 mem_mask)
{
	uint16_t old = m_videoram[offset];
	COMBINE_DATA(&m_videoram[offset]);
	if (old != m_videoram[offset])
		m_tilemap[offset >> 11]->mark_tile_dirty(((offset << 1) & 0x0fff) >> 2);
}

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

    Start/Stop the video hardware emulation.

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

VIDEO_START_MEMBER(gaelco_state,bigkarnk)
{
	m_tilemap[0] = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(gaelco_state::get_tile_info<0>)), TILEMAP_SCAN_ROWS, 16, 16, 32, 32);
	m_tilemap[1] = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(gaelco_state::get_tile_info<1>)), TILEMAP_SCAN_ROWS, 16, 16, 32, 32);

	m_tilemap[0]->set_transmask(0, 0xff01, 0x00ff); // pens 1-7 opaque, pens 0, 8-15 transparent
	m_tilemap[1]->set_transmask(0, 0xff01, 0x00ff); // pens 1-7 opaque, pens 0, 8-15 transparent
}

VIDEO_START_MEMBER(gaelco_state,maniacsq)
{
	m_tilemap[0] = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(gaelco_state::get_tile_info<0>)), TILEMAP_SCAN_ROWS, 16, 16, 32, 32);
	m_tilemap[1] = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(gaelco_state::get_tile_info<1>)), TILEMAP_SCAN_ROWS, 16, 16, 32, 32);

	m_tilemap[0]->set_transparent_pen(0);
	m_tilemap[1]->set_transparent_pen(0);
}


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

    Sprites

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

/*
    Sprite Format
    -------------

    Word | Bit(s)            | Description
    -----+-FEDCBA98-76543210-+--------------------------
      0  | -------- xxxxxxxx | y position
      0  | -----xxx -------- | not used
      0  | ----x--- -------- | sprite size
      0  | --xx---- -------- | sprite priority
      0  | -x------ -------- | flipx
      0  | x------- -------- | flipy
      1  | xxxxxxxx xxxxxxxx | not used
      2  | -------x xxxxxxxx | x position
      2  | -xxxxxx- -------- | sprite color
      3  | -------- ------xx | sprite code (8x8 quadrant)
      3  | xxxxxxxx xxxxxx-- | sprite code
*/

void gaelco_state::draw_sprites( screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect )
{
	int i, x, y, ex, ey;
	gfx_element *gfx = m_gfxdecode->gfx(0);

	static const int x_offset[2] = {0x0,0x2};
	static const int y_offset[2] = {0x0,0x1};

	for (i = 0x800 - 4 - 1; i >= 3; i -= 4)
	{
		int sx = m_spriteram[i + 2] & 0x01ff;
		int sy = (240 - (m_spriteram[i] & 0x00ff)) & 0x00ff;
		int number = m_spriteram[i + 3];
		int color = (m_spriteram[i + 2] & 0x7e00) >> 9;
		int attr = (m_spriteram[i] & 0xfe00) >> 9;
		int priority = (m_spriteram[i] & 0x3000) >> 12;

		int xflip = attr & 0x20;
		int yflip = attr & 0x40;
		int spr_size, pri_mask;

		/* palettes 0x38-0x3f are used for high priority sprites in Big Karnak */
		if (color >= 0x38)
			priority = 4;

		switch (priority)
		{
			case 0: pri_mask = 0xff00; break;
			case 1: pri_mask = 0xff00 | 0xf0f0; break;
			case 2: pri_mask = 0xff00 | 0xf0f0 | 0xcccc; break;
			case 3: pri_mask = 0xff00 | 0xf0f0 | 0xcccc | 0xaaaa; break;
			default:
			case 4: pri_mask = 0; break;
		}

		if (attr & 0x04)
			spr_size = 1;
		else
		{
			spr_size = 2;
			number &= (~3);
		}

		for (y = 0; y < spr_size; y++)
		{
			for (x = 0; x < spr_size; x++)
			{
				ex = xflip ? (spr_size - 1 - x) : x;
				ey = yflip ? (spr_size - 1 - y) : y;

				gfx->prio_transpen(bitmap,cliprect,number + x_offset[ex] + y_offset[ey],
						color,xflip,yflip,
						sx-0x0f+x*8,sy+y*8,
						screen.priority(),pri_mask,0);
			}
		}
	}
}

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

    Display Refresh

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

uint32_t gaelco_state::screen_update_maniacsq(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	/* set scroll registers */
	m_tilemap[0]->set_scrolly(0, m_vregs[0]);
	m_tilemap[0]->set_scrollx(0, m_vregs[1] + 4);
	m_tilemap[1]->set_scrolly(0, m_vregs[2]);
	m_tilemap[1]->set_scrollx(0, m_vregs[3]);

	screen.priority().fill(0, cliprect);
	bitmap.fill(0, cliprect);

	m_tilemap[1]->draw(screen, bitmap, cliprect, 3, 0);
	m_tilemap[0]->draw(screen, bitmap, cliprect, 3, 0);

	m_tilemap[1]->draw(screen, bitmap, cliprect, 2, 1);
	m_tilemap[0]->draw(screen, bitmap, cliprect, 2, 1);

	m_tilemap[1]->draw(screen, bitmap, cliprect, 1, 2);
	m_tilemap[0]->draw(screen, bitmap, cliprect, 1, 2);

	m_tilemap[1]->draw(screen, bitmap, cliprect, 0, 4);
	m_tilemap[0]->draw(screen, bitmap, cliprect, 0, 4);

	draw_sprites(screen, bitmap, cliprect);
	return 0;
}

uint32_t gaelco_state::screen_update_bigkarnk(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	/* set scroll registers */
	m_tilemap[0]->set_scrolly(0, m_vregs[0]);
	m_tilemap[0]->set_scrollx(0, m_vregs[1] + 4);
	m_tilemap[1]->set_scrolly(0, m_vregs[2]);
	m_tilemap[1]->set_scrollx(0, m_vregs[3]);

	screen.priority().fill(0, cliprect);
	bitmap.fill(0, cliprect);

	m_tilemap[1]->draw(screen, bitmap, cliprect, TILEMAP_DRAW_LAYER1 | 3, 0);
	m_tilemap[0]->draw(screen, bitmap, cliprect, TILEMAP_DRAW_LAYER1 | 3, 0);

	m_tilemap[1]->draw(screen, bitmap, cliprect, TILEMAP_DRAW_LAYER0 | 3, 1);
	m_tilemap[0]->draw(screen, bitmap, cliprect, TILEMAP_DRAW_LAYER0 | 3, 1);

	m_tilemap[1]->draw(screen, bitmap, cliprect, TILEMAP_DRAW_LAYER1 | 2, 1);
	m_tilemap[0]->draw(screen, bitmap, cliprect, TILEMAP_DRAW_LAYER1 | 2, 1);

	m_tilemap[1]->draw(screen, bitmap, cliprect, TILEMAP_DRAW_LAYER0 | 2, 2);
	m_tilemap[0]->draw(screen, bitmap, cliprect, TILEMAP_DRAW_LAYER0 | 2, 2);

	m_tilemap[1]->draw(screen, bitmap, cliprect, TILEMAP_DRAW_LAYER1 | 1, 2);
	m_tilemap[0]->draw(screen, bitmap, cliprect, TILEMAP_DRAW_LAYER1 | 1, 2);

	m_tilemap[1]->draw(screen, bitmap, cliprect, TILEMAP_DRAW_LAYER0 | 1, 4);
	m_tilemap[0]->draw(screen, bitmap, cliprect, TILEMAP_DRAW_LAYER0 | 1, 4);

	m_tilemap[1]->draw(screen, bitmap, cliprect, TILEMAP_DRAW_LAYER1 | 0, 4);
	m_tilemap[0]->draw(screen, bitmap, cliprect, TILEMAP_DRAW_LAYER1 | 0, 4);

	m_tilemap[1]->draw(screen, bitmap, cliprect, TILEMAP_DRAW_LAYER0 | 0, 8);
	m_tilemap[0]->draw(screen, bitmap, cliprect, TILEMAP_DRAW_LAYER0 | 0, 8);

	draw_sprites(screen, bitmap, cliprect);
	return 0;
}