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vidhrdw
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thunderx.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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111 lines
#include "driver.h"
#include "vidhrdw/konamiic.h"
int scontra_priority;
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 & 0x1f) << 8) | (bank << 13);
*color = layer_colorbase[layer] + ((*color & 0xe0) >> 5);
}
/***************************************************************************
Callbacks for the K051960
***************************************************************************/
static void sprite_callback(int *code,int *color,int *priority_mask)
{
/* Sprite priority 1 means appear behind background, used only to mask sprites */
/* in the foreground */
/* Sprite priority 3 means don't draw (not used) */
switch (*color & 0x30)
{
case 0x00: *priority_mask = 0xf0; break;
case 0x10: *priority_mask = 0xf0|0xcc|0xaa; break;
case 0x20: *priority_mask = 0xf0|0xcc; break;
case 0x30: *priority_mask = 0xffff; break;
}
*color = sprite_colorbase + (*color & 0x0f);
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
int scontra_vh_start(void)
{
layer_colorbase[0] = 48;
layer_colorbase[1] = 0;
layer_colorbase[2] = 16;
sprite_colorbase = 32;
if (K052109_vh_start(REGION_GFX1,NORMAL_PLANE_ORDER,tile_callback))
return 1;
if (K051960_vh_start(REGION_GFX2,NORMAL_PLANE_ORDER,sprite_callback))
{
K052109_vh_stop();
return 1;
}
return 0;
}
void scontra_vh_stop(void)
{
K052109_vh_stop();
K051960_vh_stop();
}
/***************************************************************************
Display refresh
***************************************************************************/
void scontra_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
K052109_tilemap_update();
palette_init_used_colors();
K051960_mark_sprites_colors();
if (palette_recalc())
tilemap_mark_all_pixels_dirty(ALL_TILEMAPS);
tilemap_render(ALL_TILEMAPS);
fillbitmap(priority_bitmap,0,NULL);
/* The background color is always from layer 1 - but it's always black anyway */
// fillbitmap(bitmap,Machine->pens[16 * layer_colorbase[1]],&Machine->drv->visible_area);
if (scontra_priority)
{
K052109_tilemap_draw(bitmap,2,TILEMAP_IGNORE_TRANSPARENCY|(1<<16));
K052109_tilemap_draw(bitmap,1,2<<16);
}
else
{
K052109_tilemap_draw(bitmap,1,TILEMAP_IGNORE_TRANSPARENCY|(1<<16));
K052109_tilemap_draw(bitmap,2,2<<16);
}
K052109_tilemap_draw(bitmap,0,4<<16);
K051960_sprites_draw(bitmap,-1,-1);
}