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// license:BSD-3-Clause
// copyright-holders:David Haywood
#include "emu.h"
#include "includes/welltris.h"
#include "screen.h"
void welltris_state::setbank(int num, int bank)
{
if (m_gfxbank[num] != bank)
{
m_gfxbank[num] = bank;
m_char_tilemap->mark_all_dirty();
}
}
/* Not really enough evidence here */
WRITE16_MEMBER(welltris_state::palette_bank_w)
{
if (ACCESSING_BITS_0_7)
{
if (m_charpalettebank != (data & 0x03))
{
m_charpalettebank = (data & 0x03);
m_char_tilemap->mark_all_dirty();
}
flip_screen_set(data & 0x80);
m_spritepalettebank = (data & 0x20) >> 5;
m_pixelpalettebank = (data & 0x08) >> 3;
}
}
WRITE16_MEMBER(welltris_state::gfxbank_w)
{
if (ACCESSING_BITS_0_7)
{
setbank(0, (data & 0xf0) >> 4);
setbank(1, data & 0x0f);
}
}
WRITE16_MEMBER(welltris_state::scrollreg_w)
{
switch (offset) {
case 0: m_scrollx = data - 14; break;
case 1: m_scrolly = data + 0; break;
}
}
TILE_GET_INFO_MEMBER(welltris_state::get_tile_info)
{
uint16_t code = m_charvideoram[tile_index];
int bank = (code & 0x1000) >> 12;
SET_TILE_INFO_MEMBER(0,
(code & 0x0fff) + (m_gfxbank[bank] << 12),
((code & 0xe000) >> 13) + (8 * m_charpalettebank),
0);
}
WRITE16_MEMBER(welltris_state::charvideoram_w)
{
COMBINE_DATA(&m_charvideoram[offset]);
m_char_tilemap->mark_tile_dirty(offset);
}
void welltris_state::video_start()
{
m_char_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(welltris_state::get_tile_info),this), TILEMAP_SCAN_ROWS, 8, 8, 64, 32);
m_char_tilemap->set_transparent_pen(15);
save_item(NAME(m_gfxbank));
save_item(NAME(m_charpalettebank));
save_item(NAME(m_spritepalettebank));
save_item(NAME(m_pixelpalettebank));
save_item(NAME(m_scrollx));
save_item(NAME(m_scrolly));
}
void welltris_state::draw_background(bitmap_ind16 &bitmap, const rectangle &cliprect)
{
int x, y;
int pixdata;
for (y = 0; y < 256; y++) {
for (x = 0; x < 512 / 2; x++) {
pixdata = m_pixelram[(x & 0xff) + (y & 0xff) * 256];
bitmap.pix16(y, (x * 2) + 0) = (pixdata >> 8) + (0x100 * m_pixelpalettebank) + 0x400;
bitmap.pix16(y, (x * 2) + 1) = (pixdata & 0xff) + (0x100 * m_pixelpalettebank) + 0x400;
}
}
}
uint32_t welltris_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_char_tilemap->set_scrollx(0, m_scrollx);
m_char_tilemap->set_scrolly(0, m_scrolly);
draw_background(bitmap, cliprect);
m_char_tilemap->draw(screen, bitmap, cliprect, 0, 0);
m_spr_old->turbofrc_draw_sprites(m_spriteram, m_spriteram.bytes(), m_spritepalettebank, bitmap, cliprect, screen.priority(), 0);
return 0;
}
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