/***************************************************************************
Atari G1 hardware
****************************************************************************/
#include "emu.h"
#include "video/atarirle.h"
#include "includes/atarig1.h"
/*************************************
*
* Tilemap callbacks
*
*************************************/
static TILE_GET_INFO( get_alpha_tile_info )
{
atarig1_state *state = machine.driver_data<atarig1_state>();
UINT16 data = state->m_alpha[tile_index];
int code = data & 0xfff;
int color = (data >> 12) & 0x0f;
int opaque = data & 0x8000;
SET_TILE_INFO(1, code, color, opaque ? TILE_FORCE_LAYER0 : 0);
}
static TILE_GET_INFO( get_playfield_tile_info )
{
atarig1_state *state = machine.driver_data<atarig1_state>();
UINT16 data = state->m_playfield[tile_index];
int code = (state->m_playfield_tile_bank << 12) | (data & 0xfff);
int color = (data >> 12) & 7;
SET_TILE_INFO(0, code, color, (data >> 15) & 1);
}
/*************************************
*
* Video system start
*
*************************************/
VIDEO_START( atarig1 )
{
atarig1_state *state = machine.driver_data<atarig1_state>();
/* blend the playfields and free the temporary one */
atarigen_blend_gfx(machine, 0, 2, 0x0f, 0x10);
/* initialize the playfield */
state->m_playfield_tilemap = tilemap_create(machine, get_playfield_tile_info, tilemap_scan_rows, 8,8, 64,64);
/* initialize the motion objects */
state->m_rle = machine.device("rle");
/* initialize the alphanumerics */
state->m_alpha_tilemap = tilemap_create(machine, get_alpha_tile_info, tilemap_scan_rows, 8,8, 64,32);
tilemap_set_transparent_pen(state->m_alpha_tilemap, 0);
/* reset statics */
state->m_pfscroll_xoffset = state->m_is_pitfight ? 2 : 0;
/* state saving */
state->save_item(NAME(state->m_current_control));
state->save_item(NAME(state->m_playfield_tile_bank));
state->save_item(NAME(state->m_playfield_xscroll));
state->save_item(NAME(state->m_playfield_yscroll));
}
/*************************************
*
* Periodic scanline updater
*
*************************************/
WRITE16_HANDLER( atarig1_mo_control_w )
{
atarig1_state *state = space->machine().driver_data<atarig1_state>();
logerror("MOCONT = %d (scan = %d)\n", data, space->machine().primary_screen->vpos());
/* set the control value */
COMBINE_DATA(&state->m_current_control);
}
void atarig1_scanline_update(screen_device &screen, int scanline)
{
atarig1_state *state = screen.machine().driver_data<atarig1_state>();
UINT16 *base = &state->m_alpha[(scanline / 8) * 64 + 48];
int i;
//if (scanline == 0) logerror("-------\n");
/* keep in range */
if (base >= &state->m_alpha[0x800])
return;
screen.update_partial(MAX(scanline - 1, 0));
/* update the playfield scrolls */
for (i = 0; i < 8; i++)
{
UINT16 word;
/* first word controls horizontal scroll */
word = *base++;
if (word & 0x8000)
{
int newscroll = ((word >> 6) + state->m_pfscroll_xoffset) & 0x1ff;
if (newscroll != state->m_playfield_xscroll)
{
screen.update_partial(MAX(scanline + i - 1, 0));
tilemap_set_scrollx(state->m_playfield_tilemap, 0, newscroll);
state->m_playfield_xscroll = newscroll;
}
}
/* second word controls vertical scroll and tile bank */
word = *base++;
if (word & 0x8000)
{
int newscroll = ((word >> 6) - (scanline + i)) & 0x1ff;
int newbank = word & 7;
if (newscroll != state->m_playfield_yscroll)
{
screen.update_partial(MAX(scanline + i - 1, 0));
tilemap_set_scrolly(state->m_playfield_tilemap, 0, newscroll);
state->m_playfield_yscroll = newscroll;
}
if (newbank != state->m_playfield_tile_bank)
{
screen.update_partial(MAX(scanline + i - 1, 0));
tilemap_mark_all_tiles_dirty(state->m_playfield_tilemap);
state->m_playfield_tile_bank = newbank;
}
}
}
}
/*************************************
*
* Main refresh
*
*************************************/
SCREEN_UPDATE( atarig1 )
{
atarig1_state *state = screen->machine().driver_data<atarig1_state>();
/* draw the playfield */
tilemap_draw(bitmap, cliprect, state->m_playfield_tilemap, 0, 0);
/* copy the motion objects on top */
copybitmap_trans(bitmap, atarirle_get_vram(state->m_rle, 0), 0, 0, 0, 0, cliprect, 0);
/* add the alpha on top */
tilemap_draw(bitmap, cliprect, state->m_alpha_tilemap, 0, 0);
return 0;
}
SCREEN_EOF( atarig1 )
{
atarig1_state *state = machine.driver_data<atarig1_state>();
atarirle_eof(state->m_rle);
}