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AmigActive 10
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vidhrdw
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shisen.c
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C/C++ Source or Header
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2000-04-23
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2KB
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85 lines
#include "driver.h"
#include "vidhrdw/generic.h"
static int gfxbank;
WRITE_HANDLER( sichuan2_bankswitch_w )
{
int bankaddress;
unsigned char *RAM = memory_region(REGION_CPU1);
if (data & 0xc0) logerror("bank switch %02x\n",data);
/* bits 0-2 select ROM bank */
bankaddress = 0x10000 + (data & 0x07) * 0x4000;
cpu_setbank(1,&RAM[bankaddress]);
/* bits 3-5 select gfx bank */
if (gfxbank != ((data & 0x38) >> 3))
{
gfxbank = (data & 0x38) >> 3;
memset(dirtybuffer,1,videoram_size);
}
/* bits 6-7 unknown */
}
WRITE_HANDLER( sichuan2_paletteram_w )
{
int r,g,b;
paletteram[offset] = data;
offset &= 0xff;
r = paletteram[offset+0x000] & 0x1f;
g = paletteram[offset+0x100] & 0x1f;
b = paletteram[offset+0x200] & 0x1f;
r = (r << 3) | (r >> 2);
g = (g << 3) | (g >> 2);
b = (b << 3) | (b >> 2);
palette_change_color(offset,r,g,b);
}
void sichuan2_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-2;offs >= 0;offs -= 2)
{
if (dirtybuffer[offs] || dirtybuffer[offs+1])
{
int sx,sy;
dirtybuffer[offs] = dirtybuffer[offs+1] = 0;
sx = (offs/2) % 64;
sy = (offs/2) / 64;
drawgfx(tmpbitmap,Machine->gfx[0],
videoram[offs] + ((videoram[offs+1] & 0x0f) << 8) + (gfxbank << 12),
(videoram[offs+1] & 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);
}