// 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;
}
}
}