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/***************************************************************************
video.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "driver.h"
static tilemap *bg_tilemap;
/***************************************************************************
Convert the color PROMs into a more useable format.
***************************************************************************/
PALETTE_INIT( hanaawas )
{
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 += 0x10;
/* color_prom now points to the beginning of the lookup table */
/* character lookup table. The 1bpp tiles really only use colors 0-0x0f and the
3bpp ones 0x10-0x1f */
for (i = 0;i < TOTAL_COLORS(0)/8 ;i++)
{
COLOR(0,i*8+0) = color_prom[i*4+0x00] & 0x0f;
COLOR(0,i*8+1) = color_prom[i*4+0x01] & 0x0f;
COLOR(0,i*8+2) = color_prom[i*4+0x02] & 0x0f;
COLOR(0,i*8+3) = color_prom[i*4+0x03] & 0x0f;
COLOR(0,i*8+4) = color_prom[i*4+0x80] & 0x0f;
COLOR(0,i*8+5) = color_prom[i*4+0x81] & 0x0f;
COLOR(0,i*8+6) = color_prom[i*4+0x82] & 0x0f;
COLOR(0,i*8+7) = color_prom[i*4+0x83] & 0x0f;
}
}
WRITE8_HANDLER( hanaawas_videoram_w )
{
videoram[offset] = data;
tilemap_mark_tile_dirty(bg_tilemap, offset);
}
WRITE8_HANDLER( hanaawas_colorram_w )
{
colorram[offset] = data;
/* dirty both current and next offsets */
tilemap_mark_tile_dirty(bg_tilemap, offset);
tilemap_mark_tile_dirty(bg_tilemap, (offset + (flip_screen ? -1 : 1)) & 0x03ff);
}
WRITE8_HANDLER( hanaawas_portB_w )
{
/* 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 )
{
/* the color is determined by the current color byte, but the bank is via the previous one!!! */
int offset = (tile_index + (flip_screen ? 1 : -1)) & 0x3ff;
int attr = colorram[offset];
int gfxbank = (attr & 0x40) >> 6;
int code = videoram[tile_index] + ((attr & 0x20) << 3);
int color = colorram[tile_index] & 0x1f;
SET_TILE_INFO(gfxbank, code, color, 0);
}
VIDEO_START( hanaawas )
{
bg_tilemap = tilemap_create(get_bg_tile_info, tilemap_scan_rows,
TILEMAP_TYPE_PEN, 8, 8, 32, 32);
}
VIDEO_UPDATE( hanaawas )
{
tilemap_draw(bitmap, &machine->screen[0].visarea, bg_tilemap, 0, 0);
return 0;
}
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