/***************************************************************************
video.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "emu.h"
#include "video/konicdev.h"
#include "includes/ajax.h"
/***************************************************************************
Callbacks for the K052109
***************************************************************************/
void ajax_tile_callback( running_machine &machine, int layer, int bank, int *code, int *color, int *flags, int *priority )
{
ajax_state *state = machine.driver_data<ajax_state>();
*code |= ((*color & 0x0f) << 8) | (bank << 12);
*color = state->m_layer_colorbase[layer] + ((*color & 0xf0) >> 4);
}
/***************************************************************************
Callbacks for the K051960
***************************************************************************/
void ajax_sprite_callback( running_machine &machine, int *code, int *color, int *priority, int *shadow )
{
/* priority bits:
4 over zoom (0 = have priority)
5 over B (0 = have priority)
6 over A (1 = have priority)
never over F
*/
ajax_state *state = machine.driver_data<ajax_state>();
*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 = state->m_sprite_colorbase + (*color & 0x0f);
}
/***************************************************************************
Callbacks for the K051316
***************************************************************************/
void ajax_zoom_callback( running_machine &machine, int *code, int *color, int *flags )
{
ajax_state *state = machine.driver_data<ajax_state>();
*code |= ((*color & 0x07) << 8);
*color = state->m_zoom_colorbase + ((*color & 0x08) >> 3);
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
VIDEO_START( ajax )
{
ajax_state *state = machine.driver_data<ajax_state>();
state->m_layer_colorbase[0] = 64;
state->m_layer_colorbase[1] = 0;
state->m_layer_colorbase[2] = 32;
state->m_sprite_colorbase = 16;
state->m_zoom_colorbase = 6; /* == 48 since it's 7-bit graphics */
}
/***************************************************************************
Display Refresh
***************************************************************************/
SCREEN_UPDATE( ajax )
{
ajax_state *state = screen->machine().driver_data<ajax_state>();
k052109_tilemap_update(state->m_k052109);
bitmap_fill(screen->machine().priority_bitmap, cliprect, 0);
bitmap_fill(bitmap,cliprect,get_black_pen(screen->machine()));
k052109_tilemap_draw(state->m_k052109, bitmap, cliprect, 2, 0, 1);
if (state->m_priority)
{
/* basic layer order is B, zoom, A, F */
k051316_zoom_draw(state->m_k051316, bitmap, cliprect, 0, 4);
k052109_tilemap_draw(state->m_k052109, bitmap, cliprect, 1, 0, 2);
}
else
{
/* basic layer order is B, A, zoom, F */
k052109_tilemap_draw(state->m_k052109, bitmap, cliprect, 1, 0, 2);
k051316_zoom_draw(state->m_k051316, bitmap, cliprect, 0, 4);
}
k052109_tilemap_draw(state->m_k052109, bitmap, cliprect, 0, 0, 8);
k051960_sprites_draw(state->m_k051960, bitmap, cliprect, -1, -1);
return 0;
}