home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
AmigActive 10
/
AACD 10.iso
/
AACD
/
Games
/
MAME
/
src
/
vidhrdw
/
pbaction.c
< prev
next >
Wrap
C/C++ Source or Header
|
2000-04-04
|
5KB
|
240 lines
/***************************************************************************
vidhrdw.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
unsigned char *pbaction_videoram2,*pbaction_colorram2;
WRITE_HANDLER( pbaction_videoram2_w );
WRITE_HANDLER( pbaction_colorram2_w );
static unsigned char *dirtybuffer2;
static struct osd_bitmap *tmpbitmap2;
static int scroll;
static int flipscreen;
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
int pbaction_vh_start(void)
{
int i;
if (generic_vh_start() != 0)
return 1;
if ((dirtybuffer2 = malloc(videoram_size)) == 0)
{
generic_vh_stop();
return 1;
}
memset(dirtybuffer2,1,videoram_size);
if ((tmpbitmap2 = osd_create_bitmap(Machine->drv->screen_width,Machine->drv->screen_height)) == 0)
{
free(dirtybuffer2);
generic_vh_stop();
return 1;
}
/* leave everything at the default, but map all foreground 0 pens as transparent */
for (i = 0;i < 16;i++) palette_used_colors[8 * i] = PALETTE_COLOR_TRANSPARENT;
return 0;
}
/***************************************************************************
Stop the video hardware emulation.
***************************************************************************/
void pbaction_vh_stop(void)
{
osd_free_bitmap(tmpbitmap2);
free(dirtybuffer2);
generic_vh_stop();
}
WRITE_HANDLER( pbaction_videoram2_w )
{
if (pbaction_videoram2[offset] != data)
{
dirtybuffer2[offset] = 1;
pbaction_videoram2[offset] = data;
}
}
WRITE_HANDLER( pbaction_colorram2_w )
{
if (pbaction_colorram2[offset] != data)
{
dirtybuffer2[offset] = 1;
pbaction_colorram2[offset] = data;
}
}
WRITE_HANDLER( pbaction_scroll_w )
{
scroll = -(data-3);
}
WRITE_HANDLER( pbaction_flipscreen_w )
{
if (flipscreen != (data & 1))
{
flipscreen = data & 1;
memset(dirtybuffer,1,videoram_size);
memset(dirtybuffer2,1,videoram_size);
}
}
/***************************************************************************
Draw the game screen in the given osd_bitmap.
Do NOT call osd_update_display() from this function, it will be called by
the main emulation engine.
***************************************************************************/
void pbaction_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs;
/* recalc the palette if necessary */
if (palette_recalc())
{
memset(dirtybuffer,1,videoram_size);
memset(dirtybuffer2,1,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,flipx,flipy;
dirtybuffer[offs] = 0;
sx = offs % 32;
sy = offs / 32;
flipx = colorram[offs] & 0x40;
flipy = colorram[offs] & 0x80;
if (flipscreen)
{
sx = 31 - sx;
sy = 31 - sy;
flipx = !flipx;
flipy = !flipy;
}
drawgfx(tmpbitmap,Machine->gfx[0],
videoram[offs] + 0x10 * (colorram[offs] & 0x30),
colorram[offs] & 0x0f,
flipx,flipy,
8*sx,8*sy,
&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
if (dirtybuffer2[offs])
{
int sx,sy,flipy;
dirtybuffer2[offs] = 0;
sx = offs % 32;
sy = offs / 32;
flipy = pbaction_colorram2[offs] & 0x80;
if (flipscreen)
{
sx = 31 - sx;
sy = 31 - sy;
flipy = !flipy;
}
drawgfx(tmpbitmap2,Machine->gfx[1],
pbaction_videoram2[offs] + 0x10 * (pbaction_colorram2[offs] & 0x70),
pbaction_colorram2[offs] & 0x0f,
flipscreen,flipy,
8*sx,8*sy,
&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
}
/* copy the background */
copyscrollbitmap(bitmap,tmpbitmap2,1,&scroll,0,0,&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
/* Draw the sprites. */
for (offs = spriteram_size - 4;offs >= 0;offs -= 4)
{
int sx,sy,flipx,flipy;
/* if next sprite is double size, skip this one */
if (offs > 0 && spriteram[offs - 4] & 0x80) continue;
sx = spriteram[offs+3];
if (spriteram[offs] & 0x80)
sy = 225-spriteram[offs+2];
else
sy = 241-spriteram[offs+2];
flipx = spriteram[offs+1] & 0x40;
flipy = spriteram[offs+1] & 0x80;
if (flipscreen)
{
if (spriteram[offs] & 0x80)
{
sx = 224 - sx;
sy = 225 - sy;
}
else
{
sx = 240 - sx;
sy = 241 - sy;
}
flipx = !flipx;
flipy = !flipy;
}
drawgfx(bitmap,Machine->gfx[(spriteram[offs] & 0x80) ? 3 : 2], /* normal or double size */
spriteram[offs],
spriteram[offs + 1] & 0x0f,
flipx,flipy,
sx+scroll,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
/* copy the foreground */
copyscrollbitmap(bitmap,tmpbitmap,1,&scroll,0,0,&Machine->drv->visible_area,TRANSPARENCY_PEN,palette_transparent_pen);
}