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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;
/* allocate the colortable */
machine->colortable = colortable_alloc(machine, 0x10);
/* create a lookup table for the palette */
for (i = 0; i < 0x10; i++)
{
int bit0, bit1, bit2;
int r, g, b;
/* red component */
bit0 = (color_prom[i] >> 0) & 0x01;
bit1 = (color_prom[i] >> 1) & 0x01;
bit2 = (color_prom[i] >> 2) & 0x01;
r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* green component */
bit0 = (color_prom[i] >> 3) & 0x01;
bit1 = (color_prom[i] >> 4) & 0x01;
bit2 = (color_prom[i] >> 5) & 0x01;
g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* blue component */
bit0 = 0;
bit1 = (color_prom[i] >> 6) & 0x01;
bit2 = (color_prom[i] >> 7) & 0x01;
b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
colortable_palette_set_color(machine->colortable, i, MAKE_RGB(r, g, b));
}
/* color_prom now points to the beginning of the lookup table */
color_prom += 0x20;
/* character lookup table. The 1bpp tiles really only use colors 0-0x0f and the
3bpp ones 0x10-0x1f */
for (i = 0; i < 0x100; i++)
{
int swapped_i = BITSWAP8(i,2,7,6,5,4,3,1,0);
UINT8 ctabentry = color_prom[swapped_i] & 0x0f;
colortable_entry_set_value(machine->colortable, i, ctabentry);
}
}
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_get() ? -1 : 1)) & 0x03ff);
}
WRITE8_HANDLER( hanaawas_portB_w )
{
/* bit 7 is flip screen */
if (flip_screen_get() != (~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_get() ? 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(machine, get_bg_tile_info, tilemap_scan_rows, 8, 8, 32, 32);
}
VIDEO_UPDATE( hanaawas )
{
tilemap_draw(bitmap, cliprect, bg_tilemap, 0, 0);
return 0;
}
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