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AmigActive 10
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AACD 10.iso
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vidhrdw
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galpanic.c
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C/C++ Source or Header
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2000-05-04
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4KB
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172 lines
#include "driver.h"
#include "vidhrdw/generic.h"
unsigned char *galpanic_bgvideoram,*galpanic_fgvideoram;
size_t galpanic_fgvideoram_size;
void galpanic_init_palette(unsigned char *palette, unsigned short *colortable,const unsigned char *color_prom)
{
int i;
palette += 3*1024; /* first 1024 colors are dynamic */
/* initialize 555 RGB lookup */
for (i = 0;i < 32768;i++)
{
int r,g,b;
r = (i >> 5) & 0x1f;
g = (i >> 10) & 0x1f;
b = (i >> 0) & 0x1f;
(*palette++) = (r << 3) | (r >> 2);
(*palette++) = (g << 3) | (g >> 2);
(*palette++) = (b << 3) | (b >> 2);
}
}
READ_HANDLER( galpanic_bgvideoram_r )
{
return READ_WORD(&galpanic_bgvideoram[offset]);
}
WRITE_HANDLER( galpanic_bgvideoram_w )
{
int sx,sy,color;
COMBINE_WORD_MEM(&galpanic_bgvideoram[offset],data);
sy = (offset/2) / 256;
sx = (offset/2) % 256;
color = READ_WORD(&galpanic_bgvideoram[offset]);
plot_pixel(tmpbitmap, sx, sy, Machine->pens[1024 + (color >> 1)]);
}
READ_HANDLER( galpanic_fgvideoram_r )
{
return READ_WORD(&galpanic_fgvideoram[offset]);
}
WRITE_HANDLER( galpanic_fgvideoram_w )
{
COMBINE_WORD_MEM(&galpanic_fgvideoram[offset],data);
}
READ_HANDLER( galpanic_paletteram_r )
{
return READ_WORD(&paletteram[offset]);
}
WRITE_HANDLER( galpanic_paletteram_w )
{
int r,g,b;
int oldword = READ_WORD(&paletteram[offset]);
int newword = COMBINE_WORD(oldword,data);
WRITE_WORD(&paletteram[offset],newword);
r = (newword >> 6) & 0x1f;
g = (newword >> 11) & 0x1f;
b = (newword >> 1) & 0x1f;
/* bit 0 seems to be a transparency flag for the front bitmap */
r = (r << 3) | (r >> 2);
g = (g << 3) | (g >> 2);
b = (b << 3) | (b >> 2);
palette_change_color(offset / 2,r,g,b);
}
READ_HANDLER( galpanic_spriteram_r )
{
return READ_WORD(&spriteram[offset]);
}
WRITE_HANDLER( galpanic_spriteram_w )
{
COMBINE_WORD_MEM(&spriteram[offset],data);
}
/***************************************************************************
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 galpanic_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs;
int sx,sy;
palette_recalc();
/* copy the temporary bitmap to the screen */
/* it's raw RGB, so it doesn't have to be recalculated even if palette_recalc() */
/* returns true */
copybitmap(bitmap,tmpbitmap,0,0,0,0,&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
for (offs = 0;offs < galpanic_fgvideoram_size;offs+=2)
{
int color;
sx = (offs/2) % 256;
sy = (offs/2) / 256;
color = READ_WORD(&galpanic_fgvideoram[offs]);
if (color)
{
plot_pixel(bitmap, sx, sy, Machine->pens[color]);
}
}
sx = sy = 0;
for (offs = 0;offs < spriteram_size;offs += 0x10)
{
int x,y,code,color,flipx,flipy;
x = READ_WORD(&spriteram[offs + 8]) - ((READ_WORD(&spriteram[offs + 6]) & 0x01) << 8);
y = READ_WORD(&spriteram[offs + 10]) + ((READ_WORD(&spriteram[offs + 6]) & 0x02) << 7);
if (READ_WORD(&spriteram[offs + 6]) & 0x04) /* multi sprite */
{
sx += x;
sy += y;
}
else
{
sx = x;
sy = y;
}
/* bit 0 [offs + 0] is used but I don't know what for */
code = READ_WORD(&spriteram[offs + 12]) + ((READ_WORD(&spriteram[offs + 14]) & 0x1f) << 8);
color = (READ_WORD(&spriteram[offs + 6]) & 0xf0) >> 4;
flipx = READ_WORD(&spriteram[offs + 14]) & 0x80;
flipy = READ_WORD(&spriteram[offs + 14]) & 0x40;
drawgfx(bitmap,Machine->gfx[0],
code,
color,
flipx,flipy,
sx,sy - 16,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}