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/***************************************************************************
video.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "driver.h"
static int flipscreen[2];
WRITE8_HANDLER( pkunwar_flipscreen_w )
{
if (flipscreen[0] != (data & 1))
{
flipscreen[0] = data & 1;
memset(dirtybuffer,1,videoram_size);
}
if (flipscreen[1] != (data & 2))
{
flipscreen[1] = data & 2;
memset(dirtybuffer,1,videoram_size);
}
}
VIDEO_UPDATE( pkunwar )
{
int offs;
/* for every character in the Video RAM, check if it has been modified */
/* since last time and update it accordingly. */
for (offs = videoram_size - 1;offs >= 0;offs--)
{
if (dirtybuffer[offs])
{
int sx,sy;
dirtybuffer[offs] = 0;
sx = offs % 32;
sy = offs / 32;
if (flipscreen[0]) sx = 31 - sx;
if (flipscreen[1]) sy = 31 - sy;
drawgfx(tmpbitmap,machine->gfx[0],
videoram[offs] + ((colorram[offs] & 0x07) << 8),
(colorram[offs] & 0xf0) >> 4,
flipscreen[0],flipscreen[1],
8*sx,8*sy,
&machine->screen[0].visarea,TRANSPARENCY_NONE,0);
}
}
/* copy the character mapped graphics */
copybitmap(bitmap,tmpbitmap,0,0,0,0,&machine->screen[0].visarea,TRANSPARENCY_NONE,0);
/* Draw the sprites. */
for (offs = 0;offs < spriteram_size;offs += 32)
{
int sx,sy,flipx,flipy;
sx = ((spriteram[offs + 1] + 8) & 0xff) - 8;
sy = spriteram[offs + 2];
flipx = spriteram[offs] & 0x01;
flipy = spriteram[offs] & 0x02;
if (flipscreen[0])
{
sx = 240 - sx;
flipx = !flipx;
}
if (flipscreen[1])
{
sy = 240 - sy;
flipy = !flipy;
}
drawgfx(bitmap,machine->gfx[1],
((spriteram[offs] & 0xfc) >> 2) + ((spriteram[offs + 3] & 0x07) << 6),
(spriteram[offs + 3] & 0xf0) >> 4,
flipx,flipy,
sx,sy,
&machine->screen[0].visarea,TRANSPARENCY_PEN,0);
}
/* redraw characters which have priority over sprites */
for (offs = videoram_size - 1;offs >= 0;offs--)
{
if (colorram[offs] & 0x08)
{
int sx,sy;
sx = offs % 32;
sy = offs / 32;
if (flipscreen[0]) sx = 31 - sx;
if (flipscreen[1]) sy = 31 - sy;
drawgfx(bitmap,machine->gfx[0],
videoram[offs] + ((colorram[offs] & 0x07) << 8),
(colorram[offs] & 0xf0) >> 4,
flipscreen[0],flipscreen[1],
8*sx,8*sy,
&machine->screen[0].visarea,TRANSPARENCY_PEN,0);
}
}
return 0;
}
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