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// license:BSD-3-Clause
// copyright-holders:David Haywood
#include "emu.h"
#include "includes/xyonix.h"
PALETTE_INIT_MEMBER(xyonix_state, xyonix)
{
const uint8_t *color_prom = memregion("proms")->base();
int i;
for (i = 0;i < palette.entries();i++)
{
int bit0,bit1,bit2,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] >> 5) & 0x01;
bit1 = (color_prom[i] >> 6) & 0x01;
bit2 = (color_prom[i] >> 7) & 0x01;
g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* blue component */
bit0 = (color_prom[i] >> 3) & 0x01;
bit1 = (color_prom[i] >> 4) & 0x01;
b = 0x4f * bit0 + 0xa8 * bit1;
palette.set_pen_color(i,rgb_t(r,g,b));
}
}
TILE_GET_INFO_MEMBER(xyonix_state::get_tile_info)
{
int tileno;
int attr = m_vidram[tile_index+0x1000+1];
tileno = (m_vidram[tile_index+1] << 0) | ((attr & 0x0f) << 8);
SET_TILE_INFO_MEMBER(0,tileno,attr >> 4,0);
}
WRITE8_MEMBER(xyonix_state::vidram_w)
{
m_vidram[offset] = data;
m_tilemap->mark_tile_dirty((offset-1)&0x0fff);
}
void xyonix_state::video_start()
{
m_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(xyonix_state::get_tile_info),this), TILEMAP_SCAN_ROWS, 4, 8, 80, 32);
}
uint32_t xyonix_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_tilemap->draw(screen, bitmap, cliprect, 0, 0);
return 0;
}
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