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// license:BSD-3-Clause
// copyright-holders:Zsolt Vasvari
/***************************************************************************
video.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "emu.h"
#include "includes/hanaawas.h"
/***************************************************************************
Convert the color PROMs into a more useable format.
***************************************************************************/
PALETTE_INIT_MEMBER(hanaawas_state, hanaawas)
{
const uint8_t *color_prom = memregion("proms")->base();
int i;
/* 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;
palette.set_indirect_color(i, rgb_t(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 = bitswap<8>(i,2,7,6,5,4,3,1,0);
uint8_t ctabentry = color_prom[swapped_i] & 0x0f;
palette.set_pen_indirect(i, ctabentry);
}
}
WRITE8_MEMBER(hanaawas_state::hanaawas_videoram_w)
{
m_videoram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset);
}
WRITE8_MEMBER(hanaawas_state::hanaawas_colorram_w)
{
m_colorram[offset] = data;
/* dirty both current and next offsets */
m_bg_tilemap->mark_tile_dirty(offset);
m_bg_tilemap->mark_tile_dirty((offset + (flip_screen() ? -1 : 1)) & 0x03ff);
}
WRITE8_MEMBER(hanaawas_state::hanaawas_portB_w)
{
/* bit 7 is flip screen */
if (flip_screen() != (~data & 0x80))
{
flip_screen_set(~data & 0x80);
machine().tilemap().mark_all_dirty();
}
}
TILE_GET_INFO_MEMBER(hanaawas_state::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 = m_colorram[offset];
int gfxbank = (attr & 0x40) >> 6;
int code = m_videoram[tile_index] + ((attr & 0x20) << 3);
int color = m_colorram[tile_index] & 0x1f;
SET_TILE_INFO_MEMBER(gfxbank, code, color, 0);
}
void hanaawas_state::video_start()
{
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(hanaawas_state::get_bg_tile_info),this), TILEMAP_SCAN_ROWS, 8, 8, 32, 32);
}
uint32_t hanaawas_state::screen_update_hanaawas(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
return 0;
}
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