#include "driver.h"
static tilemap *bg_tilemap;
WRITE8_HANDLER( higemaru_videoram_w )
{
videoram[offset] = data;
tilemap_mark_tile_dirty(bg_tilemap, offset);
}
WRITE8_HANDLER( higemaru_colorram_w )
{
colorram[offset] = data;
tilemap_mark_tile_dirty(bg_tilemap, offset);
}
/***************************************************************************
Convert the color PROMs into a more useable format.
***************************************************************************/
PALETTE_INIT( higemaru )
{
int i;
#define TOTAL_COLORS(gfxn) (machine->gfx[gfxn]->total_colors * machine->gfx[gfxn]->color_granularity)
#define COLOR(gfxn,offs) (colortable[machine->drv->gfxdecodeinfo[gfxn].color_codes_start + offs])
for (i = 0;i < machine->drv->total_colors;i++)
{
int bit0,bit1,bit2,r,g,b;
/* red component */
bit0 = (*color_prom >> 0) & 0x01;
bit1 = (*color_prom >> 1) & 0x01;
bit2 = (*color_prom >> 2) & 0x01;
r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* green component */
bit0 = (*color_prom >> 3) & 0x01;
bit1 = (*color_prom >> 4) & 0x01;
bit2 = (*color_prom >> 5) & 0x01;
g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* blue component */
bit0 = 0;
bit1 = (*color_prom >> 6) & 0x01;
bit2 = (*color_prom >> 7) & 0x01;
b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
palette_set_color(machine,i,MAKE_RGB(r,g,b));
color_prom++;
}
/* color_prom now points to the beginning of the lookup table */
/* characters use colors 0-15 */
for (i = 0;i < TOTAL_COLORS(0);i++)
COLOR(0,i) = *(color_prom++) & 0x0f;
color_prom += 128; /* the bottom half of the PROM doesn't seem to be used */
/* sprites use colors 16-31 */
for (i = 0;i < TOTAL_COLORS(1);i++)
COLOR(1,i) = (*(color_prom++) & 0x0f) + 0x10;
}
WRITE8_HANDLER( higemaru_c800_w )
{
if (data & 0x7c) logerror("c800 = %02x\n",data);
/* bits 0 and 1 are coin counters */
coin_counter_w(0,data & 2);
coin_counter_w(1,data & 1);
/* bit 7 flips screen */
if (flip_screen != (data & 0x80))
{
flip_screen_set(data & 0x80);
tilemap_mark_all_tiles_dirty(bg_tilemap);
}
}
static TILE_GET_INFO( get_bg_tile_info )
{
int code = videoram[tile_index] + ((colorram[tile_index] & 0x80) << 1);
int color = colorram[tile_index] & 0x1f;
SET_TILE_INFO(0, code, color, 0);
}
VIDEO_START( higemaru )
{
bg_tilemap = tilemap_create(get_bg_tile_info, tilemap_scan_rows,
TILEMAP_TYPE_PEN, 8, 8, 32, 32);
}
static void draw_sprites(running_machine *machine, mame_bitmap *bitmap, const rectangle *cliprect)
{
int offs;
for (offs = spriteram_size - 16;offs >= 0;offs -= 16)
{
int code,col,sx,sy,flipx,flipy;
code = spriteram[offs] & 0x7f;
col = spriteram[offs + 4] & 0x0f;
sx = spriteram[offs + 12];
sy = spriteram[offs + 8];
flipx = spriteram[offs + 4] & 0x10;
flipy = spriteram[offs + 4] & 0x20;
if (flip_screen)
{
sx = 240 - sx;
sy = 240 - sy;
flipx = !flipx;
flipy = !flipy;
}
drawgfx(bitmap,machine->gfx[1],
code,
col,
flipx,flipy,
sx,sy,
cliprect,TRANSPARENCY_PEN,15);
/* draw again with wraparound */
drawgfx(bitmap,machine->gfx[1],
code,
col,
flipx,flipy,
sx - 256,sy,
cliprect,TRANSPARENCY_PEN,15);
}
}
VIDEO_UPDATE( higemaru )
{
tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0);
draw_sprites(machine, bitmap, cliprect);
return 0;
}