/***************************************************************************
video/jack.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "emu.h"
#include "includes/jack.h"
WRITE8_HANDLER( jack_videoram_w )
{
jack_state *state = space->machine().driver_data<jack_state>();
state->m_videoram[offset] = data;
tilemap_mark_tile_dirty(state->m_bg_tilemap, offset);
}
WRITE8_HANDLER( jack_colorram_w )
{
jack_state *state = space->machine().driver_data<jack_state>();
state->m_colorram[offset] = data;
tilemap_mark_tile_dirty(state->m_bg_tilemap, offset);
}
WRITE8_HANDLER( jack_paletteram_w )
{
/* RGB output is inverted */
paletteram_BBGGGRRR_w(space, offset, ~data);
}
READ8_HANDLER( jack_flipscreen_r )
{
flip_screen_set(space->machine(), offset);
return 0;
}
WRITE8_HANDLER( jack_flipscreen_w )
{
flip_screen_set(space->machine(), offset);
}
static TILE_GET_INFO( get_bg_tile_info )
{
jack_state *state = machine.driver_data<jack_state>();
int code = state->m_videoram[tile_index] + ((state->m_colorram[tile_index] & 0x18) << 5);
int color = state->m_colorram[tile_index] & 0x07;
// striv: state->m_colorram[tile_index] & 0x80 ???
SET_TILE_INFO(0, code, color, 0);
}
static UINT32 tilemap_scan_cols_flipy( UINT32 col, UINT32 row, UINT32 num_cols, UINT32 num_rows )
{
/* logical (col,row) -> memory offset */
return (col * num_rows) + (num_rows - 1 - row);
}
VIDEO_START( jack )
{
jack_state *state = machine.driver_data<jack_state>();
state->m_bg_tilemap = tilemap_create(machine, get_bg_tile_info, tilemap_scan_cols_flipy, 8, 8, 32, 32);
}
static void jack_draw_sprites( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect )
{
jack_state *state = machine.driver_data<jack_state>();
UINT8 *spriteram = state->m_spriteram;
int offs;
for (offs = state->m_spriteram_size - 4; offs >= 0; offs -= 4)
{
int sx, sy, num, color, flipx, flipy;
sx = spriteram[offs + 1];
sy = spriteram[offs];
num = spriteram[offs + 2] + ((spriteram[offs + 3] & 0x08) << 5);
color = spriteram[offs + 3] & 0x07;
flipx = (spriteram[offs + 3] & 0x80);
flipy = (spriteram[offs + 3] & 0x40);
if (flip_screen_get(machine))
{
sx = 248 - sx;
sy = 248 - sy;
flipx = !flipx;
flipy = !flipy;
}
drawgfx_transpen(bitmap,cliprect,machine.gfx[0],
num,
color,
flipx,flipy,
sx,sy,0);
}
}
SCREEN_UPDATE( jack )
{
jack_state *state = screen->machine().driver_data<jack_state>();
tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0);
jack_draw_sprites(screen->machine(), bitmap, cliprect);
return 0;
}
/*
Joinem has a bit different video hardware with proms based palette,
3bpp gfx and different banking / colors bits
*/
PALETTE_INIT( joinem )
{
int i;
for (i = 0; i < machine.total_colors(); i++)
{
int bit0, bit1, bit2, r, g, b;
bit0 = (color_prom[i] >> 0) & 0x01;
bit1 = (color_prom[i] >> 1) & 0x01;
bit2 = (color_prom[i] >> 2) & 0x01;
r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
bit0 = (color_prom[i] >> 3) & 0x01;
bit1 = (color_prom[i] >> 4) & 0x01;
bit2 = (color_prom[i] >> 5) & 0x01;
g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
bit0 = 0;
bit1 = (color_prom[i] >> 6) & 0x01;
bit2 = (color_prom[i] >> 7) & 0x01;
b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
palette_set_color(machine, i, MAKE_RGB(r,g,b));
}
}
static TILE_GET_INFO( joinem_get_bg_tile_info )
{
jack_state *state = machine.driver_data<jack_state>();
int code = state->m_videoram[tile_index] + ((state->m_colorram[tile_index] & 0x03) << 8);
int color = (state->m_colorram[tile_index] & 0x38) >> 3;
SET_TILE_INFO(0, code, color, 0);
}
VIDEO_START( joinem )
{
jack_state *state = machine.driver_data<jack_state>();
state->m_bg_tilemap = tilemap_create(machine, joinem_get_bg_tile_info, tilemap_scan_cols_flipy, 8, 8, 32, 32);
}
static void joinem_draw_sprites( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect )
{
jack_state *state = machine.driver_data<jack_state>();
UINT8 *spriteram = state->m_spriteram;
int offs;
for (offs = state->m_spriteram_size - 4; offs >= 0; offs -= 4)
{
int sx, sy, num, color, flipx, flipy;
sx = spriteram[offs + 1];
sy = spriteram[offs];
num = spriteram[offs + 2] + ((spriteram[offs + 3] & 0x01) << 8);
color = (spriteram[offs + 3] & 0x38) >> 3;
flipx = (spriteram[offs + 3] & 0x80);
flipy = (spriteram[offs + 3] & 0x40);
if (flip_screen_get(machine))
{
sx = 248 - sx;
sy = 248 - sy;
flipx = !flipx;
flipy = !flipy;
}
drawgfx_transpen(bitmap,cliprect,machine.gfx[0],
num,
color,
flipx,flipy,
sx,sy,0);
}
}
SCREEN_UPDATE( joinem )
{
jack_state *state = screen->machine().driver_data<jack_state>();
tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0);
joinem_draw_sprites(screen->machine(), bitmap, cliprect);
return 0;
}