home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
AmigActive 10
/
AACD 10.iso
/
AACD
/
Games
/
MAME
/
src
/
vidhrdw
/
superqix.c
< prev
next >
Wrap
C/C++ Source or Header
|
2000-04-04
|
8KB
|
331 lines
/***************************************************************************
vidhrdw.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
static int gfxbank;
static unsigned char *superqix_bitmapram,*superqix_bitmapram2,*superqix_bitmapram_dirty,*superqix_bitmapram2_dirty;
static struct osd_bitmap *tmpbitmap2;
int sqix_minx,sqix_maxx,sqix_miny,sqix_maxy;
int sqix_last_bitmap;
int sqix_current_bitmap;
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
int superqix_vh_start(void)
{
if (generic_vh_start() != 0)
return 1;
/* palette RAM is accessed thorough I/O ports, so we have to */
/* allocate it ourselves */
if ((paletteram = malloc(256 * sizeof(unsigned char))) == 0)
{
generic_vh_stop();
return 1;
}
if ((superqix_bitmapram = malloc(0x7000 * sizeof(unsigned char))) == 0)
{
free(paletteram);
generic_vh_stop();
return 1;
}
if ((superqix_bitmapram2 = malloc(0x7000 * sizeof(unsigned char))) == 0)
{
free(superqix_bitmapram);
free(paletteram);
generic_vh_stop();
return 1;
}
if ((superqix_bitmapram_dirty = malloc(0x7000 * sizeof(unsigned char))) == 0)
{
free(superqix_bitmapram2);
free(superqix_bitmapram);
free(paletteram);
generic_vh_stop();
return 1;
}
memset(superqix_bitmapram_dirty,1,0x7000);
if ((superqix_bitmapram2_dirty = malloc(0x7000 * sizeof(unsigned char))) == 0)
{
free(superqix_bitmapram_dirty);
free(superqix_bitmapram2);
free(superqix_bitmapram);
free(paletteram);
generic_vh_stop();
return 1;
}
memset(superqix_bitmapram2_dirty,1,0x7000);
if ((tmpbitmap2 = osd_create_bitmap(256, 256)) == 0)
{
free(superqix_bitmapram2_dirty);
free(superqix_bitmapram_dirty);
free(superqix_bitmapram2);
free(superqix_bitmapram);
free(paletteram);
generic_vh_stop();
return 1;
}
sqix_minx=0;sqix_maxx=127;sqix_miny=0;sqix_maxy=223;
sqix_last_bitmap=0;
return 0;
}
/***************************************************************************
Stop the video hardware emulation.
***************************************************************************/
void superqix_vh_stop(void)
{
free(superqix_bitmapram2);
free(superqix_bitmapram);
free(superqix_bitmapram_dirty);
free(superqix_bitmapram2_dirty);
osd_free_bitmap (tmpbitmap2);
free(paletteram);
generic_vh_stop();
}
READ_HANDLER( superqix_bitmapram_r )
{
return superqix_bitmapram[offset];
}
WRITE_HANDLER( superqix_bitmapram_w )
{
if(data != superqix_bitmapram[offset])
{
int x,y;
superqix_bitmapram[offset] = data;
superqix_bitmapram_dirty[offset] = 1;
x=offset%128;
y=offset/128;
if(x<sqix_minx) sqix_minx=x;
if(x>sqix_maxx) sqix_maxx=x;
if(y<sqix_miny) sqix_miny=y;
if(y>sqix_maxy) sqix_maxy=y;
}
}
READ_HANDLER( superqix_bitmapram2_r )
{
return superqix_bitmapram2[offset];
}
WRITE_HANDLER( superqix_bitmapram2_w )
{
if(data != superqix_bitmapram2[offset])
{
int x,y;
superqix_bitmapram2[offset] = data;
superqix_bitmapram2_dirty[offset] = 1;
x=offset%128;
y=offset/128;
if(x<sqix_minx) sqix_minx=x;
if(x>sqix_maxx) sqix_maxx=x;
if(y<sqix_miny) sqix_miny=y;
if(y>sqix_maxy) sqix_maxy=y;
}
}
WRITE_HANDLER( superqix_0410_w )
{
int bankaddress;
unsigned char *RAM = memory_region(REGION_CPU1);
/* bits 0-1 select the tile bank */
if (gfxbank != (data & 0x03))
{
gfxbank = data & 0x03;
memset(dirtybuffer,1,videoram_size);
}
/* bit 2 controls bitmap 1/2 */
sqix_current_bitmap=data&4;
if(sqix_current_bitmap !=sqix_last_bitmap)
{
sqix_last_bitmap=sqix_current_bitmap;
memset(superqix_bitmapram_dirty,1,0x7000);
memset(superqix_bitmapram2_dirty,1,0x7000);
sqix_minx=0;sqix_maxx=127;sqix_miny=0;sqix_maxy=223;
}
/* bit 3 enables NMI */
interrupt_enable_w(offset,data & 0x08);
/* bits 4-5 control ROM bank */
bankaddress = 0x10000 + ((data & 0x30) >> 4) * 0x4000;
cpu_setbank(1,&RAM[bankaddress]);
}
/***************************************************************************
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 superqix_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs,i;
unsigned char pens[16];
/* recalc the palette if necessary */
if (palette_recalc())
{
memset(dirtybuffer,1,videoram_size);
memset(superqix_bitmapram_dirty,1,0x7000);
memset(superqix_bitmapram2_dirty,1,0x7000);
sqix_minx=0;sqix_maxx=127;sqix_miny=0;sqix_maxy=223;
}
/* 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;
drawgfx(tmpbitmap,Machine->gfx[(colorram[offs] & 0x04) ? 0 : (1 + gfxbank)],
videoram[offs] + 256 * (colorram[offs] & 0x03),
(colorram[offs] & 0xf0) >> 4,
0,0,
8*sx,8*sy,
&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
}
}
/* copy the character mapped graphics */
copybitmap(bitmap,tmpbitmap,0,0,0,0,&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
for(i=1;i<16;i++)
pens[i]=Machine->pens[i];
pens[0]=palette_transparent_pen;
if(sqix_current_bitmap==0) /* Bitmap 1 */
{
int x,y;
for (y = sqix_miny;y <= sqix_maxy;y++)
{
for (x = sqix_minx;x <= sqix_maxx;x++)
{
int sx,sy,d;
if(superqix_bitmapram_dirty[y*128+x])
{
superqix_bitmapram_dirty[y*128+x]=0;
d = superqix_bitmapram[y*128+x];
sx = 2*x;
sy = y+16;
plot_pixel(tmpbitmap2, sx , sy, pens[d >> 4]);
plot_pixel(tmpbitmap2, sx + 1, sy, pens[d & 0x0f]);
}
}
}
}
else /* Bitmap 2 */
{
int x,y;
for (y = sqix_miny;y <= sqix_maxy;y++)
{
for (x = sqix_minx;x <= sqix_maxx;x++)
{
int sx,sy,d;
if(superqix_bitmapram2_dirty[y*128+x])
{
superqix_bitmapram2_dirty[y*128+x]=0;
d = superqix_bitmapram2[y*128+x];
sx = 2*x;
sy = y+16;
plot_pixel(tmpbitmap2, sx , sy, pens[d >> 4]);
plot_pixel(tmpbitmap2, sx + 1, sy, pens[d & 0x0f]);
}
}
}
}
copybitmap(bitmap,tmpbitmap2,0,0,0,0,&Machine->drv->visible_area,TRANSPARENCY_PEN,palette_transparent_pen);
/* Draw the sprites. Note that it is important to draw them exactly in this */
/* order, to have the correct priorities. */
for (offs = 0;offs < spriteram_size;offs += 4)
{
drawgfx(bitmap,Machine->gfx[5],
spriteram[offs] + 256 * (spriteram[offs + 3] & 0x01),
(spriteram[offs + 3] & 0xf0) >> 4,
spriteram[offs + 3] & 0x04,spriteram[offs + 3] & 0x08,
spriteram[offs + 1],spriteram[offs + 2],
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
/* redraw characters which have priority over the bitmap */
for (offs = videoram_size - 1;offs >= 0;offs--)
{
if (colorram[offs] & 0x08)
{
int sx,sy;
sx = offs % 32;
sy = offs / 32;
drawgfx(bitmap,Machine->gfx[(colorram[offs] & 0x04) ? 0 : 1],
videoram[offs] + 256 * (colorram[offs] & 0x03),
(colorram[offs] & 0xf0) >> 4,
0,0,
8*sx,8*sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}
sqix_minx=1000;sqix_maxx=-1;sqix_miny=1000;sqix_maxy=-1;
}