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AmigActive 10
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vidhrdw
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aliens.c
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C/C++ Source or Header
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2000-03-26
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3KB
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112 lines
#include "driver.h"
#include "vidhrdw/konamiic.h"
static int layer_colorbase[3],sprite_colorbase;
/***************************************************************************
Callbacks for the K052109
***************************************************************************/
static void tile_callback(int layer,int bank,int *code,int *color)
{
*code |= ((*color & 0x3f) << 8) | (bank << 14);
*color = layer_colorbase[layer] + ((*color & 0xc0) >> 6);
}
/***************************************************************************
Callbacks for the K051960
***************************************************************************/
static void sprite_callback(int *code,int *color,int *priority_mask)
{
/* The PROM allows for mixed priorities, where sprites would have */
/* priority over text but not on one or both of the other two planes. */
switch (*color & 0x70)
{
case 0x10: *priority_mask = 0x00; break; /* over ABF */
case 0x00: *priority_mask = 0xf0 ; break; /* over AB, not F */
case 0x40: *priority_mask = 0xf0|0xcc ; break; /* over A, not BF */
case 0x20:
case 0x60: *priority_mask = 0xf0|0xcc|0xaa; break; /* over -, not ABF */
case 0x50: *priority_mask = 0xcc ; break; /* over AF, not B */
case 0x30:
case 0x70: *priority_mask = 0xcc|0xaa; break; /* over F, not AB */
}
*code |= (*color & 0x80) << 6;
*color = sprite_colorbase + (*color & 0x0f);
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
int aliens_vh_start( void )
{
paletteram = malloc(0x400);
if (!paletteram) return 1;
layer_colorbase[0] = 0;
layer_colorbase[1] = 4;
layer_colorbase[2] = 8;
sprite_colorbase = 16;
if (K052109_vh_start(REGION_GFX1,NORMAL_PLANE_ORDER,tile_callback))
{
free(paletteram);
return 1;
}
if (K051960_vh_start(REGION_GFX2,NORMAL_PLANE_ORDER,sprite_callback))
{
free(paletteram);
K052109_vh_stop();
return 1;
}
return 0;
}
void aliens_vh_stop( void )
{
free(paletteram);
K052109_vh_stop();
K051960_vh_stop();
}
/***************************************************************************
Display refresh
***************************************************************************/
void aliens_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
K052109_tilemap_update();
palette_init_used_colors();
K051960_mark_sprites_colors();
palette_used_colors[layer_colorbase[1] * 16] |= PALETTE_COLOR_VISIBLE;
if (palette_recalc())
tilemap_mark_all_pixels_dirty(ALL_TILEMAPS);
tilemap_render(ALL_TILEMAPS);
fillbitmap(priority_bitmap,0,NULL);
fillbitmap(bitmap,Machine->pens[layer_colorbase[1] * 16],&Machine->drv->visible_area);
K052109_tilemap_draw(bitmap,1,1<<16);
K052109_tilemap_draw(bitmap,2,2<<16);
K052109_tilemap_draw(bitmap,0,4<<16);
K051960_sprites_draw(bitmap,-1,-1);
}