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AmigActive 10
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AACD 10.iso
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vidhrdw
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jack.c
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C/C++ Source or Header
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2000-04-04
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2KB
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107 lines
/***************************************************************************
vidhrdw/jack.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
static int flipscreen = 0;
WRITE_HANDLER( jack_paletteram_w )
{
/* RGB output is inverted */
paletteram_BBGGGRRR_w(offset,~data);
}
READ_HANDLER( jack_flipscreen_r )
{
if (offset != flipscreen)
{
flipscreen = offset;
memset(dirtybuffer,1,videoram_size);
}
return 0;
}
WRITE_HANDLER( jack_flipscreen_w )
{
jack_flipscreen_r(offset);
}
void jack_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs;
if (palette_recalc())
memset(dirtybuffer,1,videoram_size);
/* 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 = 31 - offs % 32;
if (flipscreen)
{
sx = 31 - sx;
sy = 31 - sy;
}
drawgfx(tmpbitmap,Machine->gfx[0],
videoram[offs] + ((colorram[offs] & 0x18) << 5),
colorram[offs] & 0x07,
flipscreen,flipscreen,
8*sx,8*sy,
&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
}
/* copy the temporary bitmap to the screen */
copybitmap(bitmap,tmpbitmap,0,0,0,0,&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
/* draw sprites */
for (offs = spriteram_size - 4;offs >= 0;offs -= 4)
{
int sx,sy,num, color,flipx,flipy;
sx = spriteram[offs + 1];
sy = spriteram[offs];
num = spriteram[offs + 2] + ((spriteram[offs + 3] & 0x08) << 5);
color = spriteram[offs + 3] & 0x07;
flipx = (spriteram[offs + 3] & 0x80);
flipy = (spriteram[offs + 3] & 0x40);
if (flipscreen)
{
sx = 248 - sx;
sy = 248 - sy;
flipx = !flipx;
flipy = !flipy;
}
drawgfx(bitmap,Machine->gfx[0],
num,
color,
flipx,flipy,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}