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vidhrdw
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battlnts.c
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C/C++ Source or Header
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2000-04-04
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2KB
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91 lines
#include "driver.h"
#include "vidhrdw/generic.h"
#include "vidhrdw/konamiic.h"
static int spritebank;
static int layer_colorbase[2];
/***************************************************************************
Callback for the K007342
***************************************************************************/
static void tile_callback(int layer, int bank, int *code, int *color)
{
*code |= ((*color & 0x0f) << 9) | ((*color & 0x40) << 2);
*color = layer_colorbase[layer];
}
/***************************************************************************
Callback for the K007420
***************************************************************************/
static void sprite_callback(int *code,int *color)
{
*code |= ((*color & 0xc0) << 2) | spritebank;
*code = (*code << 2) | ((*color & 0x30) >> 4);
*color = 0;
}
WRITE_HANDLER( battlnts_spritebank_w )
{
spritebank = 1024 * (data & 1);
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
int battlnts_vh_start(void)
{
layer_colorbase[0] = 0;
layer_colorbase[1] = 0;
if (K007342_vh_start(0,tile_callback))
{
/* Battlantis use this as Work RAM */
K007342_tilemap_set_enable(1, 0);
return 1;
}
if (K007420_vh_start(1,sprite_callback))
{
K007420_vh_stop();
return 1;
}
return 0;
}
void battlnts_vh_stop(void)
{
K007342_vh_stop();
K007420_vh_stop();
}
/***************************************************************************
Screen Refresh
***************************************************************************/
void battlnts_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh){
K007342_tilemap_update();
if (palette_recalc())
tilemap_mark_all_pixels_dirty(ALL_TILEMAPS);
tilemap_render( ALL_TILEMAPS );
K007342_tilemap_draw( bitmap, 0, TILEMAP_IGNORE_TRANSPARENCY );
K007420_sprites_draw( bitmap );
K007342_tilemap_draw( bitmap, 0, 1 | TILEMAP_IGNORE_TRANSPARENCY );
}