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/***************************************************************************
Video emulation for Omori Battle Cross
***************************************************************************/
#include "emu.h"
#include "includes/battlex.h"
WRITE8_HANDLER( battlex_palette_w )
{
palette_set_color_rgb(space->machine(), offset, pal1bit(data >> 0), pal1bit(data >> 2), pal1bit(data >> 1));
}
WRITE8_HANDLER( battlex_scroll_x_lsb_w )
{
battlex_state *state = space->machine().driver_data<battlex_state>();
state->m_scroll_lsb = data;
}
WRITE8_HANDLER( battlex_scroll_x_msb_w )
{
battlex_state *state = space->machine().driver_data<battlex_state>();
state->m_scroll_msb = data;
}
WRITE8_HANDLER( battlex_scroll_starfield_w )
{
}
WRITE8_HANDLER( battlex_videoram_w )
{
battlex_state *state = space->machine().driver_data<battlex_state>();
state->m_videoram[offset] = data;
tilemap_mark_tile_dirty(state->m_bg_tilemap, offset / 2);
}
WRITE8_HANDLER( battlex_flipscreen_w )
{
battlex_state *state = space->machine().driver_data<battlex_state>();
state->m_starfield_enabled = data & 0x10;
if (flip_screen_get(space->machine()) != (data >> 7))
{
flip_screen_set(space->machine(), data & 0x80);
tilemap_mark_all_tiles_dirty_all(space->machine());
}
}
static TILE_GET_INFO( get_bg_tile_info )
{
battlex_state *state = machine.driver_data<battlex_state>();
int tile = state->m_videoram[tile_index * 2] | (((state->m_videoram[tile_index * 2 + 1] & 0x01)) << 8);
int color = (state->m_videoram[tile_index * 2 + 1] & 0x0e) >> 1; // high bits unused
SET_TILE_INFO(0, tile, color, 0);
}
VIDEO_START( battlex )
{
battlex_state *state = machine.driver_data<battlex_state>();
state->m_bg_tilemap = tilemap_create(machine, get_bg_tile_info, tilemap_scan_rows, 8, 8, 64, 32);
}
static void draw_sprites( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect )
{
battlex_state *state = machine.driver_data<battlex_state>();
const gfx_element *gfx = machine.gfx[1];
UINT8 *source = state->m_spriteram;
UINT8 *finish = state->m_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_get(machine))
{
sx = 240 - sx;
sy = 240 - sy;
flipx = !flipx;
flipy = !flipy;
}
drawgfx_transpen(bitmap, cliprect, gfx, tile, color, flipx, flipy, sx, sy, 0);
source += 4;
}
}
SCREEN_UPDATE(battlex)
{
battlex_state *state = screen->machine().driver_data<battlex_state>();
tilemap_set_scrollx(state->m_bg_tilemap, 0, state->m_scroll_lsb | (state->m_scroll_msb << 8));
tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0);
draw_sprites(screen->machine(), bitmap, cliprect);
return 0;
}
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