/***************************************************************************
Atari Rampart hardware
****************************************************************************/
#include "driver.h"
#include "machine/atarigen.h"
#include "rampart.h"
/*************************************
*
* Globals we own
*
*************************************/
UINT16 *rampart_bitmap;
/*************************************
*
* Statics
*
*************************************/
static UINT8 *pfdirty;
static mame_bitmap *pfbitmap;
static int xdim, ydim;
/*************************************
*
* Video system start
*
*************************************/
VIDEO_START( rampart )
{
static const struct atarimo_desc modesc =
{
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 }}, /* mask for the graphics bank */
{{ 0,0x7fff,0,0 }}, /* mask for the code index */
{{ 0 }}, /* mask for the upper 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" */
0, /* callback routine for special entries */
};
/* initialize the playfield */
rampart_bitmap_init(machine, 43*8, 30*8);
/* initialize the motion objects */
atarimo_init(machine, 0, &modesc);
/* set the intial scroll offset */
atarimo_set_xscroll(0, -4);
}
/*************************************
*
* Main refresh
*
*************************************/
VIDEO_UPDATE( rampart )
{
struct atarimo_rect_list rectlist;
mame_bitmap *mobitmap;
int x, y, r;
/* draw the playfield */
rampart_bitmap_render(machine, bitmap, cliprect);
/* draw and merge the MO */
mobitmap = atarimo_render(machine, 0, cliprect, &rectlist);
for (r = 0; r < rectlist.numrects; r++, rectlist.rect++)
for (y = rectlist.rect->min_y; y <= rectlist.rect->max_y; y++)
{
UINT16 *mo = (UINT16 *)mobitmap->base + mobitmap->rowpixels * y;
UINT16 *pf = (UINT16 *)bitmap->base + bitmap->rowpixels * y;
for (x = rectlist.rect->min_x; x <= rectlist.rect->max_x; x++)
if (mo[x])
{
/* not yet verified
*/
pf[x] = mo[x];
/* erase behind ourselves */
mo[x] = 0;
}
}
return 0;
}
/*************************************
*
* Bitmap initialization
*
*************************************/
void rampart_bitmap_init(running_machine *machine, int _xdim, int _ydim)
{
/* set the dimensions */
xdim = _xdim;
ydim = _ydim;
/* allocate dirty map */
pfdirty = auto_malloc(sizeof(pfdirty[0]) * ydim);
memset(pfdirty, 1, sizeof(pfdirty[0]) * ydim);
/* allocate playfield bitmap */
pfbitmap = auto_bitmap_alloc(xdim, ydim, machine->screen[0].format);
}
/*************************************
*
* Bitmap RAM write handler
*
*************************************/
WRITE16_HANDLER( rampart_bitmap_w )
{
int oldword = rampart_bitmap[offset];
int newword = oldword;
int x, y;
COMBINE_DATA(&newword);
if (oldword != newword)
{
rampart_bitmap[offset] = newword;
/* track color usage */
x = offset % 256;
y = offset / 256;
if (x < xdim && y < ydim)
pfdirty[y] = 1;
}
}
/*************************************
*
* Bitmap rendering
*
*************************************/
void rampart_bitmap_render(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect)
{
int x, y;
/* update any dirty scanlines */
for (y = 0; y < ydim; y++)
if (pfdirty[y])
{
const UINT16 *src = &rampart_bitmap[256 * y];
UINT8 scanline[512];
UINT8 *dst = scanline;
/* regenerate the line */
for (x = 0; x < xdim / 2; x++)
{
int bits = *src++;
*dst++ = bits >> 8;
*dst++ = bits;
}
pfdirty[y] = 0;
/* draw it */
draw_scanline8(pfbitmap, 0, y, xdim, scanline, machine->pens, -1);
}
/* copy the cached bitmap */
copybitmap(bitmap, pfbitmap, 0, 0, 0, 0, cliprect, TRANSPARENCY_NONE, 0);
}