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AmigActive 10
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AACD 10.iso
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vidhrdw
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ohmygod.c
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C/C++ Source or Header
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2000-05-06
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3KB
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125 lines
#include "driver.h"
#include "vidhrdw/generic.h"
unsigned char *ohmygod_videoram;
static int spritebank;
static struct tilemap *bg_tilemap;
/***************************************************************************
Callbacks for the TileMap code
***************************************************************************/
static void get_tile_info(int tile_index)
{
UINT16 code = READ_WORD(&ohmygod_videoram[4*tile_index+2]);
UINT16 attr = READ_WORD(&ohmygod_videoram[4*tile_index]);
SET_TILE_INFO(0,code,(attr & 0x0f00) >> 8)
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
int ohmygod_vh_start(void)
{
bg_tilemap = tilemap_create(get_tile_info,tilemap_scan_rows,TILEMAP_OPAQUE,8,8,64,64);
if (!bg_tilemap)
return 1;
return 0;
}
/***************************************************************************
Memory handlers
***************************************************************************/
READ_HANDLER( ohmygod_videoram_r )
{
return READ_WORD(&ohmygod_videoram[offset]);
}
WRITE_HANDLER( ohmygod_videoram_w )
{
int oldword = READ_WORD(&ohmygod_videoram[offset]);
int newword = COMBINE_WORD(oldword,data);
if (oldword != newword)
{
WRITE_WORD(&ohmygod_videoram[offset],newword);
tilemap_mark_tile_dirty(bg_tilemap,offset/4);
}
}
WRITE_HANDLER( ohmygod_spritebank_w )
{
spritebank = data & 0x8000;
}
WRITE_HANDLER( ohmygod_scroll_w )
{
if (offset == 0) tilemap_set_scrollx(bg_tilemap,0,data - 0x81ec);
else tilemap_set_scrolly(bg_tilemap,0,data - 0x81ef);
}
/***************************************************************************
Display refresh
***************************************************************************/
static void draw_sprites(struct osd_bitmap *bitmap)
{
int offs;
for (offs = 0;offs < spriteram_size;offs += 8)
{
int sx,sy,code,color,flipx;
unsigned char *sr;
sr = spritebank ? spriteram_2 : spriteram;
code = READ_WORD(&sr[offs+6]) & 0x0fff;
color = READ_WORD(&sr[offs+4]) & 0x000f;
sx = READ_WORD(&sr[offs+0]) - 29;
sy = READ_WORD(&sr[offs+2]);
if (sy >= 32768) sy -= 65536;
flipx = READ_WORD(&sr[offs+6]) & 0x8000;
drawgfx(bitmap,Machine->gfx[1],
code,
color,
flipx,0,
sx,sy,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}
void ohmygod_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
tilemap_update(ALL_TILEMAPS);
if (palette_recalc())
tilemap_mark_all_pixels_dirty(ALL_TILEMAPS);
tilemap_render(ALL_TILEMAPS);
tilemap_draw(bitmap,bg_tilemap,0);
draw_sprites(bitmap);
}