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AmigActive 10
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vidhrdw
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ajax.c
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C/C++ Source or Header
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2000-03-21
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4KB
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147 lines
/***************************************************************************
vidhrdw.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
#include "vidhrdw/konamiic.h"
unsigned char ajax_priority;
static int layer_colorbase[3],sprite_colorbase,zoom_colorbase;
/***************************************************************************
Callbacks for the K052109
***************************************************************************/
static void tile_callback(int layer,int bank,int *code,int *color)
{
*code |= ((*color & 0x0f) << 8) | (bank << 12);
*color = layer_colorbase[layer] + ((*color & 0xf0) >> 4);
}
/***************************************************************************
Callbacks for the K051960
***************************************************************************/
static void sprite_callback(int *code,int *color,int *priority)
{
/* priority bits:
4 over zoom (0 = have priority)
5 over B (0 = have priority)
6 over A (1 = have priority)
never over F
*/
*priority = 0xff00; /* F = 8 */
if ( *color & 0x10) *priority |= 0xf0f0; /* Z = 4 */
if (~*color & 0x40) *priority |= 0xcccc; /* A = 2 */
if ( *color & 0x20) *priority |= 0xaaaa; /* B = 1 */
*color = sprite_colorbase + (*color & 0x0f);
}
/***************************************************************************
Callbacks for the K051316
***************************************************************************/
static void zoom_callback(int *code,int *color)
{
*code |= ((*color & 0x07) << 8);
*color = zoom_colorbase + ((*color & 0x08) >> 3);
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
int ajax_vh_start( void )
{
layer_colorbase[0] = 64;
layer_colorbase[1] = 0;
layer_colorbase[2] = 32;
sprite_colorbase = 16;
zoom_colorbase = 6; /* == 48 since it's 7-bit graphics */
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;
}
if (K051316_vh_start_0(REGION_GFX3,7,zoom_callback))
{
K052109_vh_stop();
K051960_vh_stop();
return 1;
}
return 0;
}
void ajax_vh_stop( void )
{
K052109_vh_stop();
K051960_vh_stop();
K051316_vh_stop_0();
}
/***************************************************************************
Display Refresh
***************************************************************************/
void ajax_vh_screenrefresh( struct osd_bitmap *bitmap, int fullrefresh )
{
K052109_tilemap_update();
K051316_tilemap_update_0();
palette_init_used_colors();
K051960_mark_sprites_colors();
/* set back pen for the zoom layer */
palette_used_colors[(zoom_colorbase + 0) * 128] = PALETTE_COLOR_TRANSPARENT;
palette_used_colors[(zoom_colorbase + 1) * 128] = PALETTE_COLOR_TRANSPARENT;
if (palette_recalc())
tilemap_mark_all_pixels_dirty(ALL_TILEMAPS);
tilemap_render(ALL_TILEMAPS);
fillbitmap(priority_bitmap,0,NULL);
if (ajax_priority)
{
/* basic layer order is B, zoom, A, F */
K052109_tilemap_draw(bitmap,2,TILEMAP_IGNORE_TRANSPARENCY|(1<<16));
K051316_zoom_draw_0(bitmap,4);
K052109_tilemap_draw(bitmap,1,2<<16);
K052109_tilemap_draw(bitmap,0,8<<16);
}
else
{
/* basic layer order is B, A, zoom, F */
K052109_tilemap_draw(bitmap,2,TILEMAP_IGNORE_TRANSPARENCY|(1<<16));
K052109_tilemap_draw(bitmap,1,2<<16);
K051316_zoom_draw_0(bitmap,4);
K052109_tilemap_draw(bitmap,0,8<<16);
}
K051960_sprites_draw(bitmap,-1,-1);
}