/***************************************************************************
bking.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "emu.h"
#include "video/resnet.h"
#include "includes/bking.h"
/***************************************************************************
Convert the color PROMs into a more useable format.
The palette PROM is connected to the RGB output this way:
bit 7 -- 390 ohm resistor -- BLUE
-- 220 ohm resistor -- BLUE
-- 820 ohm resistor -- GREEN
-- 390 ohm resistor -- GREEN
-- 220 ohm resistor -- GREEN
-- 820 ohm resistor -- RED
-- 390 ohm resistor -- RED
bit 0 -- 220 ohm resistor -- RED
***************************************************************************/
PALETTE_INIT( bking )
{
static const int resistances_rg[3] = { 220, 390, 820 };
static const int resistances_b [2] = { 220, 390 };
double rweights[3], gweights[3], bweights[2];
int i;
/* compute the color output resistor weights */
compute_resistor_weights(0, 255, -1.0,
3, &resistances_rg[0], rweights, 0, 0,
3, &resistances_rg[0], gweights, 0, 0,
2, &resistances_b[0], bweights, 0, 0);
for (i = 0; i < machine.total_colors(); i++)
{
UINT16 pen;
int bit0, bit1, bit2, r, g, b;
/* color PROM A7-A8 is the palette select */
if (i < 0x20)
/* characters - image bits go to A0-A2 of the color PROM */
pen = (((i - 0x00) << 4) & 0x180) | ((i - 0x00) & 0x07);
else if (i < 0x30)
/* crow - image bits go to A5-A6. */
pen = (((i - 0x20) << 5) & 0x180) | (((i - 0x20) & 0x03) << 5);
else if (i < 0x38)
/* ball #1 - image bit goes to A3 */
pen = (((i - 0x30) << 6) & 0x180) | (((i - 0x30) & 0x01) << 3);
else
/* ball #2 - image bit goes to A4 */
pen = (((i - 0x38) << 6) & 0x180) | (((i - 0x38) & 0x01) << 4);
/* red component */
bit0 = (color_prom[pen] >> 0) & 0x01;
bit1 = (color_prom[pen] >> 1) & 0x01;
bit2 = (color_prom[pen] >> 2) & 0x01;
r = combine_3_weights(rweights, bit0, bit1, bit2);
/* green component */
bit0 = (color_prom[pen] >> 3) & 0x01;
bit1 = (color_prom[pen] >> 4) & 0x01;
bit2 = (color_prom[pen] >> 5) & 0x01;
g = combine_3_weights(gweights, bit0, bit1, bit2);
/* blue component */
bit0 = (color_prom[pen] >> 6) & 0x01;
bit1 = (color_prom[pen] >> 7) & 0x01;
b = combine_2_weights(gweights, bit0, bit1);
palette_set_color(machine, i, MAKE_RGB(r, g, b));
}
}
WRITE8_HANDLER( bking_xld1_w )
{
bking_state *state = space->machine().driver_data<bking_state>();
state->m_xld1 = -data;
}
WRITE8_HANDLER( bking_yld1_w )
{
bking_state *state = space->machine().driver_data<bking_state>();
state->m_yld1 = -data;
}
WRITE8_HANDLER( bking_xld2_w )
{
bking_state *state = space->machine().driver_data<bking_state>();
state->m_xld2 = -data;
}
WRITE8_HANDLER( bking_yld2_w )
{
bking_state *state = space->machine().driver_data<bking_state>();
state->m_yld2 = -data;
}
WRITE8_HANDLER( bking_xld3_w )
{
bking_state *state = space->machine().driver_data<bking_state>();
state->m_xld3 = -data;
}
WRITE8_HANDLER( bking_yld3_w )
{
bking_state *state = space->machine().driver_data<bking_state>();
state->m_yld3 = -data;
}
WRITE8_HANDLER( bking_cont1_w )
{
bking_state *state = space->machine().driver_data<bking_state>();
/* D0 = COIN LOCK */
/* D1 = BALL 5 (Controller selection) */
/* D2 = VINV (flip screen) */
/* D3 = Not Connected */
/* D4-D7 = CROW0-CROW3 (selects crow picture) */
coin_lockout_global_w(space->machine(), ~data & 0x01);
flip_screen_set_no_update(space->machine(), data & 0x04);
tilemap_set_flip_all(space->machine(), flip_screen_get(space->machine()) ? TILEMAP_FLIPX | TILEMAP_FLIPY : 0);
state->m_controller = data & 0x02;
state->m_crow_pic = (data >> 4) & 0x0f;
}
WRITE8_HANDLER( bking_cont2_w )
{
bking_state *state = space->machine().driver_data<bking_state>();
/* D0-D2 = BALL10 - BALL12 (Selects player 1 ball picture) */
/* D3-D5 = BALL20 - BALL22 (Selects player 2 ball picture) */
/* D6 = HIT1 */
/* D7 = HIT2 */
state->m_ball1_pic = (data >> 0) & 0x07;
state->m_ball2_pic = (data >> 3) & 0x07;
state->m_hit = data >> 6;
}
WRITE8_HANDLER( bking_cont3_w )
{
bking_state *state = space->machine().driver_data<bking_state>();
/* D0 = CROW INV (inverts Crow picture and coordinates) */
/* D1-D2 = COLOR 0 - COLOR 1 (switches 4 color palettes, global across all graphics) */
/* D3 = SOUND STOP */
state->m_crow_flip = ~data & 0x01;
if (state->m_palette_bank != ((data >> 1) & 0x03))
{
tilemap_mark_all_tiles_dirty(state->m_bg_tilemap);
}
state->m_palette_bank = (data >> 1) & 0x03;
space->machine().sound().system_mute(data & 0x08);
}
WRITE8_HANDLER( bking_msk_w )
{
bking_state *state = space->machine().driver_data<bking_state>();
state->m_pc3259_mask++;
}
WRITE8_HANDLER( bking_hitclr_w )
{
bking_state *state = space->machine().driver_data<bking_state>();
state->m_pc3259_mask = 0;
state->m_pc3259_output[0] = 0;
state->m_pc3259_output[1] = 0;
state->m_pc3259_output[2] = 0;
state->m_pc3259_output[3] = 0;
}
WRITE8_HANDLER( bking_playfield_w )
{
bking_state *state = space->machine().driver_data<bking_state>();
state->m_playfield_ram[offset] = data;
tilemap_mark_tile_dirty(state->m_bg_tilemap, offset / 2);
}
READ8_HANDLER( bking_input_port_5_r )
{
bking_state *state = space->machine().driver_data<bking_state>();
return input_port_read(space->machine(), state->m_controller ? "TRACK1_X" : "TRACK0_X");
}
READ8_HANDLER( bking_input_port_6_r )
{
bking_state *state = space->machine().driver_data<bking_state>();
return input_port_read(space->machine(), state->m_controller ? "TRACK1_Y" : "TRACK0_Y");
}
READ8_HANDLER( bking_pos_r )
{
bking_state *state = space->machine().driver_data<bking_state>();
return state->m_pc3259_output[offset / 8] << 4;
}
static TILE_GET_INFO( get_tile_info )
{
bking_state *state = machine.driver_data<bking_state>();
UINT8 code0 = state->m_playfield_ram[2 * tile_index + 0];
UINT8 code1 = state->m_playfield_ram[2 * tile_index + 1];
int flags = 0;
if (code1 & 4) flags |= TILE_FLIPX;
if (code1 & 8) flags |= TILE_FLIPY;
SET_TILE_INFO(0, code0 + 256 * code1, state->m_palette_bank, flags);
}
VIDEO_START( bking )
{
bking_state *state = machine.driver_data<bking_state>();
state->m_bg_tilemap = tilemap_create(machine, get_tile_info, tilemap_scan_rows, 8, 8, 32, 32);
state->m_tmp_bitmap1 = machine.primary_screen->alloc_compatible_bitmap();
state->m_tmp_bitmap2 = machine.primary_screen->alloc_compatible_bitmap();
state->save_item(NAME(*state->m_tmp_bitmap1));
state->save_item(NAME(*state->m_tmp_bitmap2));
}
SCREEN_UPDATE( bking )
{
bking_state *state = screen->machine().driver_data<bking_state>();
tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0);
/* draw the balls */
drawgfx_transpen(bitmap, cliprect, screen->machine().gfx[2],
state->m_ball1_pic,
state->m_palette_bank,
0, 0,
state->m_xld1, state->m_yld1, 0);
drawgfx_transpen(bitmap, cliprect, screen->machine().gfx[3],
state->m_ball2_pic,
state->m_palette_bank,
0, 0,
state->m_xld2, state->m_yld2, 0);
/* draw the crow */
drawgfx_transpen(bitmap, cliprect, screen->machine().gfx[1],
state->m_crow_pic,
state->m_palette_bank,
state->m_crow_flip, state->m_crow_flip,
state->m_crow_flip ? state->m_xld3 - 16 : 256 - state->m_xld3, state->m_crow_flip ? state->m_yld3 - 16 : 256 - state->m_yld3, 0);
return 0;
}
SCREEN_EOF( bking )
{
bking_state *state = machine.driver_data<bking_state>();
static const rectangle rect = { 0, 7, 0, 15 };
int xld = 0;
int yld = 0;
UINT32 latch = 0;
if (state->m_pc3259_mask == 6) /* player 1 */
{
xld = state->m_xld1;
yld = state->m_yld1;
drawgfx_opaque(state->m_tmp_bitmap2, &rect, machine.gfx[2],
state->m_ball1_pic,
0,
0, 0,
0, 0);
latch = 0x0c00;
}
if (state->m_pc3259_mask == 3) /* player 2 */
{
xld = state->m_xld2;
yld = state->m_yld2;
drawgfx_opaque(state->m_tmp_bitmap2, &rect, machine.gfx[3],
state->m_ball2_pic,
0,
0, 0,
0, 0);
latch = 0x0400;
}
tilemap_set_scrollx(state->m_bg_tilemap, 0, flip_screen_get(machine) ? -xld : xld);
tilemap_set_scrolly(state->m_bg_tilemap, 0, flip_screen_get(machine) ? -yld : yld);
tilemap_draw(state->m_tmp_bitmap1, &rect, state->m_bg_tilemap, 0, 0);
tilemap_set_scrollx(state->m_bg_tilemap, 0, 0);
tilemap_set_scrolly(state->m_bg_tilemap, 0, 0);
if (latch != 0)
{
const UINT8* MASK = machine.region("user1")->base() + 8 * state->m_hit;
int x;
int y;
for (y = rect.min_y; y <= rect.max_y; y++)
{
const UINT16* p0 = BITMAP_ADDR16(state->m_tmp_bitmap1, y, 0);
const UINT16* p1 = BITMAP_ADDR16(state->m_tmp_bitmap2, y, 0);
for (x = rect.min_x; x <= rect.max_x; x++)
{
if (MASK[p0[x] & 7] && p1[x])
{
int col = (xld + x) / 8 + 1;
int row = (yld + y) / 8 + 0;
latch |= (flip_screen_get(machine) ? 31 - col : col) << 0;
latch |= (flip_screen_get(machine) ? 31 - row : row) << 5;
state->m_pc3259_output[0] = (latch >> 0x0) & 0xf;
state->m_pc3259_output[1] = (latch >> 0x4) & 0xf;
state->m_pc3259_output[2] = (latch >> 0x8) & 0xf;
state->m_pc3259_output[3] = (latch >> 0xc) & 0xf;
return;
}
}
}
}
}