/***************************************************************************
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "emu.h"
#include "video/konicdev.h"
#include "includes/flkatck.h"
/***************************************************************************
Callbacks for the K007121
***************************************************************************/
static TILE_GET_INFO( get_tile_info_A )
{
flkatck_state *state = machine.driver_data<flkatck_state>();
UINT8 ctrl_0 = k007121_ctrlram_r(state->m_k007121, 0);
UINT8 ctrl_2 = k007121_ctrlram_r(state->m_k007121, 2);
UINT8 ctrl_3 = k007121_ctrlram_r(state->m_k007121, 3);
UINT8 ctrl_4 = k007121_ctrlram_r(state->m_k007121, 4);
UINT8 ctrl_5 = k007121_ctrlram_r(state->m_k007121, 5);
int attr = state->m_k007121_ram[tile_index];
int code = state->m_k007121_ram[tile_index + 0x400];
int bit0 = (ctrl_5 >> 0) & 0x03;
int bit1 = (ctrl_5 >> 2) & 0x03;
int bit2 = (ctrl_5 >> 4) & 0x03;
int bit3 = (ctrl_5 >> 6) & 0x03;
int bank = ((attr & 0x80) >> 7) |
((attr >> (bit0 + 2)) & 0x02) |
((attr >> (bit1 + 1)) & 0x04) |
((attr >> (bit2 )) & 0x08) |
((attr >> (bit3 - 1)) & 0x10) |
((ctrl_3 & 0x01) << 5);
int mask = (ctrl_4 & 0xf0) >> 4;
bank = (bank & ~(mask << 1)) | ((ctrl_4 & mask) << 1);
if ((attr == 0x0d) && (!ctrl_0) && (!ctrl_2))
bank = 0; /* this allows the game to print text
in all banks selected by the k007121 */
SET_TILE_INFO(
0,
code + 256*bank,
(attr & 0x0f) + 16,
(attr & 0x20) ? TILE_FLIPY : 0);
}
static TILE_GET_INFO( get_tile_info_B )
{
flkatck_state *state = machine.driver_data<flkatck_state>();
int attr = state->m_k007121_ram[tile_index + 0x800];
int code = state->m_k007121_ram[tile_index + 0xc00];
SET_TILE_INFO(
0,
code,
(attr & 0x0f) + 16,
0);
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
VIDEO_START( flkatck )
{
flkatck_state *state = machine.driver_data<flkatck_state>();
state->m_k007121_tilemap[0] = tilemap_create(machine, get_tile_info_A, tilemap_scan_rows, 8, 8, 32, 32);
state->m_k007121_tilemap[1] = tilemap_create(machine, get_tile_info_B, tilemap_scan_rows, 8, 8, 32, 32);
}
/***************************************************************************
Memory handlers
***************************************************************************/
WRITE8_HANDLER( flkatck_k007121_w )
{
flkatck_state *state = space->machine().driver_data<flkatck_state>();
state->m_k007121_ram[offset] = data;
if (offset < 0x1000) /* tiles */
{
if (offset & 0x800) /* score */
tilemap_mark_tile_dirty(state->m_k007121_tilemap[1], offset & 0x3ff);
else
tilemap_mark_tile_dirty(state->m_k007121_tilemap[0], offset & 0x3ff);
}
}
WRITE8_HANDLER( flkatck_k007121_regs_w )
{
flkatck_state *state = space->machine().driver_data<flkatck_state>();
switch (offset)
{
case 0x04: /* ROM bank select */
if (data != k007121_ctrlram_r(state->m_k007121, 4))
tilemap_mark_all_tiles_dirty_all(space->machine());
break;
case 0x07: /* flip screen + IRQ control */
state->m_flipscreen = data & 0x08;
tilemap_set_flip_all(space->machine(), state->m_flipscreen ? (TILEMAP_FLIPY | TILEMAP_FLIPX) : 0);
state->m_irq_enabled = data & 0x02;
break;
}
k007121_ctrl_w(state->m_k007121, offset, data);
}
/***************************************************************************
Display Refresh
***************************************************************************/
/***************************************************************************
Flack Attack sprites. Each sprite has 16 bytes!:
***************************************************************************/
SCREEN_UPDATE( flkatck )
{
flkatck_state *state = screen->machine().driver_data<flkatck_state>();
rectangle clip[2];
const rectangle &visarea = screen->visible_area();
if (state->m_flipscreen)
{
clip[0] = visarea;
clip[0].max_x -= 40;
clip[1] = visarea;
clip[1].min_x = clip[1].max_x - 40;
tilemap_set_scrollx(state->m_k007121_tilemap[0], 0, k007121_ctrlram_r(state->m_k007121, 0) - 56 );
tilemap_set_scrolly(state->m_k007121_tilemap[0], 0, k007121_ctrlram_r(state->m_k007121, 2));
tilemap_set_scrollx(state->m_k007121_tilemap[1], 0, -16);
}
else
{
clip[0] = visarea;
clip[0].min_x += 40;
clip[1] = visarea;
clip[1].max_x = 39;
clip[1].min_x = 0;
tilemap_set_scrollx(state->m_k007121_tilemap[0], 0, k007121_ctrlram_r(state->m_k007121, 0) - 40 );
tilemap_set_scrolly(state->m_k007121_tilemap[0], 0, k007121_ctrlram_r(state->m_k007121, 2));
tilemap_set_scrollx(state->m_k007121_tilemap[1], 0, 0);
}
/* compute clipping */
sect_rect(&clip[0], cliprect);
sect_rect(&clip[1], cliprect);
/* draw the graphics */
tilemap_draw(bitmap, &clip[0], state->m_k007121_tilemap[0], 0, 0);
k007121_sprites_draw(state->m_k007121, bitmap, cliprect, screen->machine().gfx[0], NULL, &state->m_k007121_ram[0x1000], 0, 40, 0, (UINT32)-1);
tilemap_draw(bitmap, &clip[1], state->m_k007121_tilemap[1], 0, 0);
return 0;
}