// license:BSD-3-Clause
// copyright-holders:David Haywood
// remaining gfx glitches
// layer priority register not fully understood
#include "emu.h"
#include "includes/drgnmst.h"
PALETTE_DECODER_MEMBER(drgnmst_state, drgnmst_IIIIRRRRGGGGBBBB)
{
int const bright = 0x5 + ((raw >> 12) & 0xf); // TODO : verify brightness value from real pcb
int r = (pal4bit((raw >> 8) & 0x0f) * bright) / 0x14;
int g = (pal4bit((raw >> 4) & 0x0f) * bright) / 0x14;
int b = (pal4bit((raw >> 0) & 0x0f) * bright) / 0x14;
if (r < 0) r = 0;
if (r > 0xff) r = 0xff;
if (g < 0) g = 0;
if (g > 0xff) g = 0xff;
if (b < 0) b = 0;
if (b > 0xff) b = 0xff;
return rgb_t(r, g, b);
}
TILE_GET_INFO_MEMBER(drgnmst_state::get_fg_tile_info)
{
int tileno, colour, flipyx;
tileno = m_fg_videoram[tile_index * 2] & 0xfff;
colour = m_fg_videoram[tile_index * 2 + 1] & 0x1f;
flipyx = (m_fg_videoram[tile_index * 2 + 1] & 0x60)>>5;
SET_TILE_INFO_MEMBER(1, tileno, colour, TILE_FLIPYX(flipyx));
}
WRITE16_MEMBER(drgnmst_state::fg_videoram_w)
{
COMBINE_DATA(&m_fg_videoram[offset]);
m_fg_tilemap->mark_tile_dirty(offset / 2);
}
TILE_GET_INFO_MEMBER(drgnmst_state::get_bg_tile_info)
{
int tileno, colour, flipyx;
tileno = (m_bg_videoram[tile_index * 2]& 0x1fff) + 0x800;
colour = m_bg_videoram[tile_index * 2 + 1] & 0x1f;
flipyx = (m_bg_videoram[tile_index * 2 + 1] & 0x60) >> 5;
SET_TILE_INFO_MEMBER(3, tileno, colour, TILE_FLIPYX(flipyx));
}
WRITE16_MEMBER(drgnmst_state::bg_videoram_w)
{
COMBINE_DATA(&m_bg_videoram[offset]);
m_bg_tilemap->mark_tile_dirty(offset / 2);
}
TILE_GET_INFO_MEMBER(drgnmst_state::get_md_tile_info)
{
int tileno, colour, flipyx;
tileno = (m_md_videoram[tile_index * 2] & 0x7fff) - 0x2000;
colour = m_md_videoram[tile_index * 2 + 1] & 0x1f;
flipyx = (m_md_videoram[tile_index * 2 + 1] & 0x60) >> 5;
SET_TILE_INFO_MEMBER(2, tileno, colour, TILE_FLIPYX(flipyx));
}
WRITE16_MEMBER(drgnmst_state::md_videoram_w)
{
COMBINE_DATA(&m_md_videoram[offset]);
m_md_tilemap->mark_tile_dirty(offset / 2);
}
void drgnmst_state::draw_sprites( bitmap_ind16 &bitmap,const rectangle &cliprect )
{
gfx_element *gfx = m_gfxdecode->gfx(0);
uint16_t *source = m_spriteram;
uint16_t *finish = source + 0x800 / 2;
while (source < finish)
{
int xpos, ypos, number, flipx, flipy, wide, high;
int x, y;
int incx, incy;
int colr;
number = source[2];
xpos = source[0];
ypos = source[1];
flipx = source[3] & 0x0020;
flipy = source[3] & 0x0040;
wide = (source[3] & 0x0f00) >> 8;
high = (source[3] & 0xf000) >> 12;
colr = (source[3] & 0x001f);
if ((source[3] & 0xff00) == 0xff00) break;
if (!flipx) { incx = 16;} else { incx = -16; xpos += 16 * wide; }
if (!flipy) { incy = 16;} else { incy = -16; ypos += 16 * high; }
for (y = 0; y <= high; y++)
{
for (x = 0; x <= wide; x++)
{
int realx, realy, realnumber;
realx = xpos + incx * x;
realy = ypos + incy * y;
realnumber = number + x + y * 16;
gfx->transpen(bitmap,cliprect, realnumber, colr, flipx, flipy, realx, realy, 15);
}
}
source += 4;
}
}
TILEMAP_MAPPER_MEMBER(drgnmst_state::fg_tilemap_scan_cols)
{
return ((col & 0x3f) << 5) | (row & 0x1f) | ((row & 0x20) << 6);
}
TILEMAP_MAPPER_MEMBER(drgnmst_state::md_tilemap_scan_cols)
{
return ((col & 0x3f) << 4) | (row & 0x0f) | ((row & 0x30) << 6);
}
TILEMAP_MAPPER_MEMBER(drgnmst_state::bg_tilemap_scan_cols)
{
return ((col & 0x3f) << 3) | (row & 0x07) | ((row & 0x38) << 6);
}
void drgnmst_state::video_start()
{
m_fg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(drgnmst_state::get_fg_tile_info),this), tilemap_mapper_delegate(FUNC(drgnmst_state::fg_tilemap_scan_cols),this), 8, 8, 64,64);
m_fg_tilemap->set_transparent_pen(15);
m_md_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(drgnmst_state::get_md_tile_info),this), tilemap_mapper_delegate(FUNC(drgnmst_state::md_tilemap_scan_cols),this), 16, 16, 64,64);
m_md_tilemap->set_transparent_pen(15);
m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(FUNC(drgnmst_state::get_bg_tile_info),this), tilemap_mapper_delegate(FUNC(drgnmst_state::bg_tilemap_scan_cols),this), 32, 32, 64,64);
m_bg_tilemap->set_transparent_pen(15);
// do the other tilemaps have rowscroll too? probably not ..
m_md_tilemap->set_scroll_rows(1024);
}
uint32_t drgnmst_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
int y, rowscroll_bank;
m_bg_tilemap->set_scrollx(0, m_vidregs[10] - 18); // verify
m_bg_tilemap->set_scrolly(0, m_vidregs[11]); // verify
// m_md_tilemap->set_scrollx(0, m_vidregs[8] - 16); // rowscrolled
m_md_tilemap->set_scrolly(0, m_vidregs[9]); // verify
m_fg_tilemap->set_scrollx(0, m_vidregs[6] - 18); // verify (test mode colour test needs it)
m_fg_tilemap->set_scrolly(0, m_vidregs[7]); // verify
rowscroll_bank = (m_vidregs[4] & 0x30) >> 4;
for (y = 0; y < 1024; y++)
m_md_tilemap->set_scrollx(y, m_vidregs[8] - 16 + m_rowscrollram[y + 0x800 * rowscroll_bank]);
// todo: figure out which bits relate to the order
switch (m_vidregs2[0])
{
case 0x2451: // fg unsure
case 0x2d9a: // fg unsure
case 0x2440: // all ok
case 0x245a: // fg unsure, title screen
m_fg_tilemap->draw(screen, bitmap, cliprect, TILEMAP_DRAW_OPAQUE, 0);
m_md_tilemap->draw(screen, bitmap, cliprect, 0, 0);
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
break;
case 0x23c0: // all ok
m_bg_tilemap->draw(screen, bitmap, cliprect, TILEMAP_DRAW_OPAQUE, 0);
m_fg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
m_md_tilemap->draw(screen, bitmap, cliprect, 0, 0);
break;
case 0x38da: // fg unsure
case 0x215a: // fg unsure
case 0x2140: // all ok
m_fg_tilemap->draw(screen, bitmap, cliprect, TILEMAP_DRAW_OPAQUE, 0);
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
m_md_tilemap->draw(screen, bitmap, cliprect, 0, 0);
break;
case 0x2d80: // all ok
m_md_tilemap->draw(screen, bitmap, cliprect, TILEMAP_DRAW_OPAQUE, 0);
m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
m_fg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
break;
default:
m_bg_tilemap->draw(screen, bitmap, cliprect, TILEMAP_DRAW_OPAQUE, 0);
m_fg_tilemap->draw(screen, bitmap, cliprect, 0, 0);
m_md_tilemap->draw(screen, bitmap, cliprect, 0, 0);
logerror ("unknown video priority regs %04x\n", m_vidregs2[0]);
}
draw_sprites(bitmap,cliprect);
// popmessage ("x %04x x %04x x %04x x %04x x %04x", m_vidregs2[0], m_vidregs[12], m_vidregs[13], m_vidregs[14], m_vidregs[15]);
// popmessage ("x %04x x %04x y %04x y %04x z %04x z %04x",m_vidregs[0],m_vidregs[1],m_vidregs[2],m_vidregs[3],m_vidregs[4],m_vidregs[5]);
return 0;
}