// license:BSD-3-Clause
// copyright-holders:Takahiro Nogi
/***************************************************************************
video.c
Functions to emulate the video hardware of the machine.
***************************************************************************/
#include "emu.h"
#include "includes/mrjong.h"
/***************************************************************************
Convert the color PROMs. (from video/pengo.c)
***************************************************************************/
void mrjong_state::mrjong_palette(palette_device &palette) const
{
uint8_t const *color_prom = memregion("proms")->base();
// create a lookup table for the palette
for (int i = 0; i < 0x10; i++)
{
int bit0, bit1, bit2;
// red component
bit0 = BIT(color_prom[i], 0);
bit1 = BIT(color_prom[i], 1);
bit2 = BIT(color_prom[i], 2);
int const r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
// green component
bit0 = BIT(color_prom[i], 3);
bit1 = BIT(color_prom[i], 4);
bit2 = BIT(color_prom[i], 5);
int const g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
// blue component
bit0 = 0;
bit1 = BIT(color_prom[i], 6);
bit2 = BIT(color_prom[i], 7);
int const 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;
// characters/sprites
for (int i = 0; i < 0x80; i++)
{
uint8_t const ctabentry = color_prom[i] & 0x0f;
palette.set_pen_indirect(i, ctabentry);
}
}
/***************************************************************************
Display control parameter.
***************************************************************************/
WRITE8_MEMBER(mrjong_state::mrjong_videoram_w)
{
m_videoram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset);
}
WRITE8_MEMBER(mrjong_state::mrjong_colorram_w)
{
m_colorram[offset] = data;
m_bg_tilemap->mark_tile_dirty(offset);
}
WRITE8_MEMBER(mrjong_state::mrjong_flipscreen_w)
{
if (flip_screen() != BIT(data, 2))
{
flip_screen_set(BIT(data, 2));
machine().tilemap().mark_all_dirty();
}
}
TILE_GET_INFO_MEMBER(mrjong_state::get_bg_tile_info)
{
int code = m_videoram[tile_index] | ((m_colorram[tile_index] & 0x20) << 3);
int color = m_colorram[tile_index] & 0x1f;
int flags = ((m_colorram[tile_index] & 0x40) ? TILE_FLIPX : 0) | ((m_colorram[tile_index] & 0x80) ? TILE_FLIPY : 0);
SET_TILE_INFO_MEMBER(0, code, color, flags);
}
void mrjong_state::video_start()
{
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(mrjong_state::get_bg_tile_info)), TILEMAP_SCAN_ROWS_FLIP_XY, 8, 8, 32, 32);
}
/*
Note: First 0x40 entries in the videoram are actually spriteram
*/
void mrjong_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect )
{
int offs;
for (offs = (0x40 - 4); offs >= 0; offs -= 4)
{
int sprt;
int color;
int sx, sy;
int flipx, flipy;
sprt = (((m_videoram[offs + 1] >> 2) & 0x3f) | ((m_videoram[offs + 3] & 0x20) << 1));
flipx = (m_videoram[offs + 1] & 0x01) >> 0;
flipy = (m_videoram[offs + 1] & 0x02) >> 1;
color = (m_videoram[offs + 3] & 0x1f);
sx = 224 - m_videoram[offs + 2];
sy = m_videoram[offs + 0];
if (flip_screen())
{
sx = 208 - sx;
sy = 240 - sy;
flipx = !flipx;
flipy = !flipy;
}
m_gfxdecode->gfx(1)->transpen(bitmap,cliprect,
sprt,
color,
flipx, flipy,
sx, sy, 0);
}
}
uint32_t mrjong_state::screen_update_mrjong(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
draw_sprites(bitmap, cliprect);
return 0;
}