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#include "driver.h"
static int battlex_scroll_lsb;
static int battlex_scroll_msb;
static tilemap *bg_tilemap;
PALETTE_INIT( battlex )
{
int i,col;
for (col = 0;col < 8;col++)
{
for (i = 0;i < 16;i++)
{
int data = i | col;
int g = pal1bit(data >> 0);
int b = pal1bit(data >> 1);
int r = pal1bit(data >> 2);
#if 0
/* from Tim's shots, bit 3 seems to have no effect (see e.g. Laser Ship on title screen) */
if (i & 8)
{
r /= 2;
g /= 2;
b /= 2;
}
#endif
palette_set_color(machine, i + 16 * col,MAKE_RGB(r,g,b));
}
}
}
WRITE8_HANDLER( battlex_palette_w )
{
palette_set_color_rgb(Machine,16*8 + offset,pal1bit(data >> 2),pal1bit(data >> 0),pal1bit(data >> 1));
}
WRITE8_HANDLER( battlex_scroll_x_lsb_w )
{
battlex_scroll_lsb = data;
}
WRITE8_HANDLER( battlex_scroll_x_msb_w )
{
battlex_scroll_msb = data;
}
WRITE8_HANDLER( battlex_videoram_w )
{
videoram[offset] = data;
tilemap_mark_tile_dirty(bg_tilemap, offset / 2);
}
WRITE8_HANDLER( battlex_flipscreen_w )
{
/* bit 4 is used, but for what? */
/* bit 7 is flip screen */
if (flip_screen != (data & 0x80))
{
flip_screen_set(data & 0x80);
tilemap_mark_all_tiles_dirty(ALL_TILEMAPS);
}
}
static TILE_GET_INFO( get_bg_tile_info )
{
int tile = videoram[tile_index*2] | (((videoram[tile_index*2+1] & 0x01)) << 8);
int color = (videoram[tile_index*2+1] & 0x0e) >> 1;
SET_TILE_INFO(0,tile,color,0);
}
VIDEO_START( battlex )
{
bg_tilemap = tilemap_create(get_bg_tile_info, tilemap_scan_rows,
TILEMAP_TYPE_PEN, 8, 8, 64, 32);
}
static void draw_sprites(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect )
{
const gfx_element *gfx = machine->gfx[1];
UINT8 *source = spriteram;
UINT8 *finish = spriteram + 0x200;
while( source<finish )
{
int sx = (source[0] & 0x7f) * 2 - (source[0] & 0x80) * 2;
int sy = source[3];
int tile = source[2] & 0x7f;
int color = source[1] & 0x07; /* bits 3,4,5 also used during explosions */
int flipy = source[1] & 0x80;
int flipx = source[1] & 0x40;
if (flip_screen)
{
sx = 240 - sx;
sy = 240 - sy;
flipx = !flipx;
flipy = !flipy;
}
drawgfx(bitmap,gfx,tile,color,flipx,flipy,sx,sy,cliprect,TRANSPARENCY_PEN,0);
source += 4;
}
}
VIDEO_UPDATE(battlex)
{
tilemap_set_scrollx(bg_tilemap, 0, battlex_scroll_lsb | (battlex_scroll_msb << 8));
tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0);
draw_sprites(machine, bitmap, cliprect);
return 0;
}
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