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#include "emu.h"
#include "includes/exprraid.h"
WRITE8_HANDLER( exprraid_videoram_w )
{
exprraid_state *state = space->machine().driver_data<exprraid_state>();
state->m_videoram[offset] = data;
tilemap_mark_tile_dirty(state->m_fg_tilemap, offset);
}
WRITE8_HANDLER( exprraid_colorram_w )
{
exprraid_state *state = space->machine().driver_data<exprraid_state>();
state->m_colorram[offset] = data;
tilemap_mark_tile_dirty(state->m_fg_tilemap, offset);
}
WRITE8_HANDLER( exprraid_flipscreen_w )
{
if (flip_screen_get(space->machine()) != (data & 0x01))
{
flip_screen_set(space->machine(), data & 0x01);
tilemap_mark_all_tiles_dirty_all(space->machine());
}
}
WRITE8_HANDLER( exprraid_bgselect_w )
{
exprraid_state *state = space->machine().driver_data<exprraid_state>();
if (state->m_bg_index[offset] != data)
{
state->m_bg_index[offset] = data;
tilemap_mark_all_tiles_dirty(state->m_bg_tilemap);
}
}
WRITE8_HANDLER( exprraid_scrollx_w )
{
exprraid_state *state = space->machine().driver_data<exprraid_state>();
tilemap_set_scrollx(state->m_bg_tilemap, offset, data);
}
WRITE8_HANDLER( exprraid_scrolly_w )
{
exprraid_state *state = space->machine().driver_data<exprraid_state>();
tilemap_set_scrolly(state->m_bg_tilemap, 0, data);
}
static TILE_GET_INFO( get_bg_tile_info )
{
exprraid_state *state = machine.driver_data<exprraid_state>();
UINT8 *tilerom = machine.region("gfx4")->base();
int data, attr, bank, code, color, flags;
int quadrant = 0, offs;
int sx = tile_index % 32;
int sy = tile_index / 32;
if (sx >= 16) quadrant++;
if (sy >= 16) quadrant += 2;
offs = (sy % 16) * 16 + (sx % 16) + (state->m_bg_index[quadrant] & 0x3f) * 0x100;
data = tilerom[offs];
attr = tilerom[offs + 0x4000];
bank = (2 * (attr & 0x03) + ((data & 0x80) >> 7)) + 2;
code = data & 0x7f;
color = (attr & 0x18) >> 3;
flags = (attr & 0x04) ? TILE_FLIPX : 0;
tileinfo->category = ((attr & 0x80) ? 1 : 0);
SET_TILE_INFO(bank, code, color, flags);
}
static TILE_GET_INFO( get_fg_tile_info )
{
exprraid_state *state = machine.driver_data<exprraid_state>();
int attr = state->m_colorram[tile_index];
int code = state->m_videoram[tile_index] + ((attr & 0x07) << 8);
int color = (attr & 0x10) >> 4;
SET_TILE_INFO(0, code, color, 0);
}
VIDEO_START( exprraid )
{
exprraid_state *state = machine.driver_data<exprraid_state>();
state->m_bg_tilemap = tilemap_create(machine, get_bg_tile_info, tilemap_scan_rows, 16, 16, 32, 32);
state->m_fg_tilemap = tilemap_create(machine, get_fg_tile_info, tilemap_scan_rows, 8, 8, 32, 32);
tilemap_set_scroll_rows(state->m_bg_tilemap, 2);
tilemap_set_transparent_pen(state->m_fg_tilemap, 0);
}
static void draw_sprites( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect )
{
exprraid_state *state = machine.driver_data<exprraid_state>();
int offs;
for (offs = 0; offs < state->m_spriteram_size; offs += 4)
{
int attr = state->m_spriteram[offs + 1];
int code = state->m_spriteram[offs + 3] + ((attr & 0xe0) << 3);
int color = (attr & 0x03) + ((attr & 0x08) >> 1);
int flipx = (attr & 0x04);
int flipy = 0;
int sx = ((248 - state->m_spriteram[offs + 2]) & 0xff) - 8;
int sy = state->m_spriteram[offs];
if (flip_screen_get(machine))
{
sx = 240 - sx;
sy = 240 - sy;
flipx = !flipx;
flipy = !flipy;
}
drawgfx_transpen(bitmap, 0, machine.gfx[1],
code, color,
flipx, flipy,
sx, sy, 0);
/* double height */
if (attr & 0x10)
{
drawgfx_transpen(bitmap,cliprect, machine.gfx[1],
code + 1, color,
flipx, flipy,
sx, sy + (flip_screen_get(machine) ? -16 : 16), 0);
}
}
}
SCREEN_UPDATE( exprraid )
{
exprraid_state *state = screen->machine().driver_data<exprraid_state>();
tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0);
draw_sprites(screen->machine(), bitmap, cliprect);
tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 1, 0);
tilemap_draw(bitmap, cliprect, state->m_fg_tilemap, 0, 0);
return 0;
}
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