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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************

    Atari Rampart hardware

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

#include "emu.h"
#include "machine/atarigen.h"
#include "video/atarimo.h"
#include "includes/rampart.h"

/*************************************
 *
 *  Video system start
 *
 *************************************/

const atari_motion_objects_config rampart_state::s_mob_config =
{
	0,                  /* index to which gfx system */
	1,                  /* number of motion object banks */
	1,                  /* are the entries linked? */
	0,                  /* are the entries split? */
	0,                  /* render in reverse order? */
	0,                  /* render in swapped X/Y order? */
	0,                  /* does the neighbor bit affect the next object? */
	8,                  /* pixels per SLIP entry (0 for no-slip) */
	0,                  /* pixel offset for SLIPs */
	0,                  /* maximum number of links to visit/scanline (0=all) */

	0x100,              /* base palette entry */
	0x100,              /* maximum number of colors */
	0,                  /* transparent pen index */

	{{ 0x00ff,0,0,0 }}, /* mask for the link */
	{{ 0,0x7fff,0,0 }}, /* mask for the code index */
	{{ 0,0,0x000f,0 }}, /* mask for the color */
	{{ 0,0,0xff80,0 }}, /* mask for the X position */
	{{ 0,0,0,0xff80 }}, /* mask for the Y position */
	{{ 0,0,0,0x0070 }}, /* mask for the width, in tiles*/
	{{ 0,0,0,0x0007 }}, /* mask for the height, in tiles */
	{{ 0,0x8000,0,0 }}, /* mask for the horizontal flip */
	{{ 0 }},            /* mask for the vertical flip */
	{{ 0 }},            /* mask for the priority */
	{{ 0 }},            /* mask for the neighbor */
	{{ 0 }},            /* mask for absolute coordinates */

	{{ 0 }},            /* mask for the special value */
	0                   /* resulting value to indicate "special" */
};

void rampart_state::video_start()
{
	/* set the intial scroll offset */
	m_mob->set_xscroll(-12);
}



/*************************************
 *
 *  Main refresh
 *
 *************************************/

uint32_t rampart_state::screen_update_rampart(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	// start drawing
	m_mob->draw_async(cliprect);

	/* draw the playfield */
	rampart_bitmap_render(bitmap, cliprect);

	// draw and merge the MO
	bitmap_ind16 &mobitmap = m_mob->bitmap();
	for (const sparse_dirty_rect *rect = m_mob->first_dirty_rect(cliprect); rect != nullptr; rect = rect->next())
		for (int y = rect->min_y; y <= rect->max_y; y++)
		{
			uint16_t *mo = &mobitmap.pix16(y);
			uint16_t *pf = &bitmap.pix16(y);
			for (int x = rect->min_x; x <= rect->max_x; x++)
				if (mo[x] != 0xffff)
				{
					/* the PCB supports more complex priorities, but the PAL is not stuffed, so we get the default */
					pf[x] = mo[x];
				}
		}
	return 0;
}



/*************************************
 *
 *  Bitmap rendering
 *
 *************************************/

void rampart_state::rampart_bitmap_render(bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	/* update any dirty scanlines */
	for (int y = cliprect.min_y; y <= cliprect.max_y; y++)
	{
		const uint16_t *src = &m_bitmap[256 * y];
		uint16_t *dst = &bitmap.pix16(y);

		/* regenerate the line */
		for (int x = cliprect.min_x & ~1; x <= cliprect.max_x; x += 2)
		{
			int bits = src[(x - 8) / 2];
			dst[x + 0] = bits >> 8;
			dst[x + 1] = bits & 0xff;
		}
	}
}