// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
Incredible Technologies/Strata system
(8-bit blitter variant)
****************************************************************************
The games run in one of two modes, either 4bpp mode with a latched
palette nibble, or straight 8bpp.
arligntn: 4bpp mode, dp = 00/80, draw to 0xxxx/2xxxx
hstennis: 4bpp mode, dp = 00/80, draw to 0xxxx/2xxxx
neckneck: 4bpp mode, dp = 00/80, draw to 0xxxx/2xxxx
ninclown: 4bpp mode, dp = 00/80, draw to 0xxxx/2xxxx
peggle: 4bpp mode, dp = 00/80, draw to 0xxxx/2xxxx
rimrockn: 4bpp mode, dp = 00/80, draw to 0xxxx/2xxxx
dynobop: 8bpp mode, dp = 00/FF, draw to 2xxxx/0xxxx
pokrdice: 8bpp mode, dp = 00/FF, draw to 2xxxx/0xxxx
slikshot: 8bpp mode, dp = 00/FF, draw to 2xxxx/0xxxx
gtg: 8bpp mode, dp = C0
stratab: 8bpp mode, dp = C0, always draws to 2xxxx
wfortune: 8bpp mode, dp = C0, always draws to 2xxxx
****************************************************************************
8-bit blitter data format:
+00 hhhhhhhh MSB of 16-bit source address
+01 llllllll LSB of 16-bit source address
+02 ---t---- Transparent: when set, don't write 0 nibbles
----r--- RLE: when set, source data is RLE compressed
-----y-- Y-flip: when set, draw up instead of down
------x- X-flip: when set, draw right instead of left
-------s Shift: when set, offset drawing by one nibble
+03 s------- Blit status: when set, blit is in progress
+03 -------- Blit start: a write here starts the blit
+04 wwwwwwww Width of blit, in bytes
+05 hhhhhhhh Height of blit, in rows
+06 mmmmmmmm Blit mask, applied to each source pixel
+07 ?------- Set by ninclown at startup
-4------ Set by games that use 4bpp latched output
--?----- Set by gtg, gtg2, peggle, pokrdice, stratab
---l---- Video status LED
----?--- Set by gtg2, ninclown, peggle, stratab
------?- Set by arligntn, neckneck, gtg, gtg2, ninclown, peggle, pokrdice, rimrockn, stratab
+08 xxxxxxxx Number of pixels to skip before drawing each row
+09 yyyyyyyy Number of rows to draw (the first height - y rows are skipped)
+0A eeeeeeee Number of pixels to skip at the end of each row
+0B ssssssss Number of rows to skip at the end of drawing
****************************************************************************
Blitter timing
Times are in 2MHz NOPs (@ 2 cycles/NOP) after issuing a blit start
command:
1x1 = 1-2 1x 1 = 1-2
2x1 = 2 1x 2 = 2
3x1 = 2 1x 3 = 2
4x1 = 2 1x 4 = 2
5x1 = 3 1x 5 = 3
6x1 = 3 1x 6 = 3
7x1 = 3-4 1x 7 = 3
8x1 = 4 1x 8 = 4
9x1 = 4 1x 9 = 4
10x1 = 4 1x 10 = 4-5
11x1 = 5 1x 11 = 5
12x1 = 5 1x 12 = 5
13x1 = 5-6 1x 13 = 5
14x1 = 6 1x 14 = 6
15x1 = 6 1x 15 = 6
16x1 = 6-7 1x 16 = 6
24x1 = 9-10 1x 24 = 9
32x1 = 12 1x 32 = 12
48x1 = 17 1x 48 = 17
64x1 = 23 1x 64 = 22
96x1 = 33 1x 96 = 33
128x1 = 44 1x128 = 44
192x1 = 65 1x192 = 65
240x1 = 81-82 1x240 = 81-82
Times are not affected by transparency or RLE settings at all.
Times are slightly variable in nature in my tests (within 1 NOP).
***************************************************************************/
#include "emu.h"
#include "cpu/m6809/m6809.h"
#include "includes/itech8.h"
/*************************************
*
* Debugging
*
*************************************/
#define FULL_LOGGING 0
#define BLIT_LOGGING 0
/*************************************
*
* Blitter constants
*
*************************************/
#define BLITTER_ADDRHI m_blitter_data[0]
#define BLITTER_ADDRLO m_blitter_data[1]
#define BLITTER_FLAGS m_blitter_data[2]
#define BLITTER_STATUS m_blitter_data[3]
#define BLITTER_WIDTH m_blitter_data[4]
#define BLITTER_HEIGHT m_blitter_data[5]
#define BLITTER_MASK m_blitter_data[6]
#define BLITTER_OUTPUT m_blitter_data[7]
#define BLITTER_XSTART m_blitter_data[8]
#define BLITTER_YCOUNT m_blitter_data[9]
#define BLITTER_XSTOP m_blitter_data[10]
#define BLITTER_YSKIP m_blitter_data[11]
#define BLITFLAG_SHIFT 0x01
#define BLITFLAG_XFLIP 0x02
#define BLITFLAG_YFLIP 0x04
#define BLITFLAG_RLE 0x08
#define BLITFLAG_TRANSPARENT 0x10
/*************************************
*
* Video start
*
*************************************/
void itech8_state::video_start()
{
/* get the TMS34061 display state */
m_tms34061->get_display_state();
/* reset statics */
m_page_select = 0xc0;
/* fetch the GROM base */
m_grom_base = memregion("grom")->base();
m_grom_size = memregion("grom")->bytes();
save_item(NAME(m_blitter_data));
save_item(NAME(m_blit_in_progress));
save_item(NAME(m_page_select));
save_item(NAME(m_fetch_offset));
save_item(NAME(m_fetch_rle_count));
save_item(NAME(m_fetch_rle_value));
save_item(NAME(m_fetch_rle_literal));
}
/*************************************
*
* Palette I/O
*
*************************************/
WRITE8_MEMBER(itech8_state::palette_w)
{
m_tlc34076->write(space, offset/2, data);
}
/*************************************
*
* Paging control
*
*************************************/
WRITE8_MEMBER(itech8_state::page_w)
{
m_screen->update_partial(m_screen->vpos());
logerror("%04x:display_page = %02X (%d)\n", m_maincpu->pc(), data, m_screen->vpos());
m_page_select = data;
}
/*************************************
*
* Blitter data fetchers
*
*************************************/
inline uint8_t itech8_state::fetch_next_raw()
{
return m_grom_base[m_fetch_offset++ % m_grom_size];
}
inline void itech8_state::consume_raw(int count)
{
m_fetch_offset += count;
}
inline uint8_t itech8_state::fetch_next_rle()
{
if (m_fetch_rle_count == 0)
{
m_fetch_rle_count = m_grom_base[m_fetch_offset++ % m_grom_size];
m_fetch_rle_literal = m_fetch_rle_count & 0x80;
m_fetch_rle_count &= 0x7f;
if (!m_fetch_rle_literal)
m_fetch_rle_value = m_grom_base[m_fetch_offset++ % m_grom_size];
}
m_fetch_rle_count--;
if (m_fetch_rle_literal)
m_fetch_rle_value = m_grom_base[m_fetch_offset++ % m_grom_size];
return m_fetch_rle_value;
}
inline void itech8_state::consume_rle(int count)
{
while (count)
{
int num_to_consume;
if (m_fetch_rle_count == 0)
{
m_fetch_rle_count = m_grom_base[m_fetch_offset++ % m_grom_size];
m_fetch_rle_literal = m_fetch_rle_count & 0x80;
m_fetch_rle_count &= 0x7f;
if (!m_fetch_rle_literal)
m_fetch_rle_value = m_grom_base[m_fetch_offset++ % m_grom_size];
}
num_to_consume = (count < m_fetch_rle_count) ? count : m_fetch_rle_count;
count -= num_to_consume;
m_fetch_rle_count -= num_to_consume;
if (m_fetch_rle_literal)
m_fetch_offset += num_to_consume;
}
}
/*************************************
*
* Core blitter
*
*************************************/
void itech8_state::perform_blit(address_space &space)
{
offs_t addr = m_tms34061->xyaddress() | ((m_tms34061->xyoffset() & 0x300) << 8);
uint8_t shift = (BLITTER_FLAGS & BLITFLAG_SHIFT) ? 4 : 0;
int transparent = (BLITTER_FLAGS & BLITFLAG_TRANSPARENT);
int ydir = (BLITTER_FLAGS & BLITFLAG_YFLIP) ? -1 : 1;
int xdir = (BLITTER_FLAGS & BLITFLAG_XFLIP) ? -1 : 1;
int xflip = (BLITTER_FLAGS & BLITFLAG_XFLIP);
int rle = (BLITTER_FLAGS & BLITFLAG_RLE);
int color = m_tms34061->latch_r(space, 0);
int width = BLITTER_WIDTH;
int height = BLITTER_HEIGHT;
uint8_t transmaskhi, transmasklo;
uint8_t mask = BLITTER_MASK;
uint8_t skip[3];
int x, y;
/* debugging */
if (FULL_LOGGING)
logerror("Blit: scan=%d src=%06x @ (%05x) for %dx%d ... flags=%02x\n",
m_screen->vpos(),
(m_grom_bank << 16) | (BLITTER_ADDRHI << 8) | BLITTER_ADDRLO,
m_tms34061->xyaddress() | ((m_tms34061->xyoffset() & 0x300) << 8),
BLITTER_WIDTH, BLITTER_HEIGHT, BLITTER_FLAGS);
/* initialize the fetcher */
m_fetch_offset = (m_grom_bank << 16) | (BLITTER_ADDRHI << 8) | BLITTER_ADDRLO;
m_fetch_rle_count = 0;
/* RLE starts with a couple of extra 0's */
if (rle)
m_fetch_offset += 2;
/* select 4-bit versus 8-bit transparency */
if (BLITTER_OUTPUT & 0x40)
transmaskhi = 0xf0, transmasklo = 0x0f;
else
transmaskhi = transmasklo = 0xff;
/* compute horiz skip counts */
skip[0] = BLITTER_XSTART;
skip[1] = (width <= BLITTER_XSTOP) ? 0 : width - 1 - BLITTER_XSTOP;
if (xdir == -1) { int temp = skip[0]; skip[0] = skip[1]; skip[1] = temp; }
width -= skip[0] + skip[1];
/* compute vertical skip counts */
if (ydir == 1)
{
skip[2] = (height <= BLITTER_YCOUNT) ? 0 : height - BLITTER_YCOUNT;
if (BLITTER_YSKIP > 1) height -= BLITTER_YSKIP - 1;
}
else
{
skip[2] = (height <= BLITTER_YSKIP) ? 0 : height - BLITTER_YSKIP;
if (BLITTER_YCOUNT > 1) height -= BLITTER_YCOUNT - 1;
}
/* skip top */
for (y = 0; y < skip[2]; y++)
{
/* skip src and dest */
addr += xdir * (width + skip[0] + skip[1]);
if (rle)
consume_rle(width + skip[0] + skip[1]);
else
consume_raw(width + skip[0] + skip[1]);
/* back up one and reverse directions */
addr -= xdir;
addr += ydir * 256;
addr &= VRAM_MASK;
xdir = -xdir;
}
/* loop over height */
for (y = skip[2]; y < height; y++)
{
/* skip left */
addr += xdir * skip[y & 1];
if (rle)
consume_rle(skip[y & 1]);
else
consume_raw(skip[y & 1]);
/* loop over width */
for (x = 0; x < width; x++)
{
uint8_t pix = rle ? fetch_next_rle() : fetch_next_raw();
/* swap pixels for X flip in 4bpp mode */
if (xflip && transmaskhi != 0xff)
pix = (pix >> 4) | (pix << 4);
pix &= mask;
/* draw upper pixel */
if (!transparent || (pix & transmaskhi))
{
m_tms34061->m_display.vram[addr] = (m_tms34061->m_display.vram[addr] & (0x0f << shift)) | ((pix & 0xf0) >> shift);
m_tms34061->m_display.latchram[addr] = (m_tms34061->m_display.latchram[addr] & (0x0f << shift)) | ((color & 0xf0) >> shift);
}
/* draw lower pixel */
if (!transparent || (pix & transmasklo))
{
offs_t addr1 = addr + shift/4;
m_tms34061->m_display.vram[addr1] = (m_tms34061->m_display.vram[addr1] & (0xf0 >> shift)) | ((pix & 0x0f) << shift);
m_tms34061->m_display.latchram[addr1] = (m_tms34061->m_display.latchram[addr1] & (0xf0 >> shift)) | ((color & 0x0f) << shift);
}
/* advance to the next byte */
addr += xdir;
addr &= VRAM_MASK;
}
/* skip right */
addr += xdir * skip[~y & 1];
if (rle)
consume_rle(skip[~y & 1]);
else
consume_raw(skip[~y & 1]);
/* back up one and reverse directions */
addr -= xdir;
addr += ydir * 256;
addr &= VRAM_MASK;
xdir = -xdir;
}
}
/*************************************
*
* Blitter finished callback
*
*************************************/
TIMER_CALLBACK_MEMBER(itech8_state::blitter_done)
{
/* turn off blitting and generate an interrupt */
m_blit_in_progress = 0;
update_interrupts(-1, -1, 1);
if (FULL_LOGGING) logerror("------------ BLIT DONE (%d) --------------\n", m_screen->vpos());
}
/*************************************
*
* Blitter I/O
*
*************************************/
READ8_MEMBER(itech8_state::blitter_r)
{
int result = m_blitter_data[offset / 2];
/* debugging */
if (FULL_LOGGING) logerror("%s:blitter_r(%02x)\n", machine().describe_context(), offset / 2);
/* low bit seems to be ignored */
offset /= 2;
/* a read from offset 3 clears the interrupt and returns the status */
if (offset == 3)
{
update_interrupts(-1, -1, 0);
if (m_blit_in_progress)
result |= 0x80;
else
result &= 0x7f;
}
/* a read from offsets 12-15 return input port values */
if (offset >= 12 && offset <= 15)
result = m_an[offset - 12].read_safe(0);
return result;
}
WRITE8_MEMBER(itech8_state::blitter_w)
{
/* low bit seems to be ignored */
offset /= 2;
m_blitter_data[offset] = data;
/* a write to offset 3 starts things going */
if (offset == 3)
{
/* log to the blitter file */
if (BLIT_LOGGING)
{
logerror("Blit: XY=%1X%04X SRC=%02X%02X%02X SIZE=%3dx%3d FLAGS=%02x",
(m_tms34061->xyoffset() >> 8) & 0x0f, m_tms34061->xyaddress(),
m_grom_bank, m_blitter_data[0], m_blitter_data[1],
m_blitter_data[4], m_blitter_data[5],
m_blitter_data[2]);
logerror(" %02X %02X %02X [%02X] %02X %02X %02X [%02X]-%02X %02X %02X %02X [%02X %02X %02X %02X]\n",
m_blitter_data[0], m_blitter_data[1],
m_blitter_data[2], m_blitter_data[3],
m_blitter_data[4], m_blitter_data[5],
m_blitter_data[6], m_blitter_data[7],
m_blitter_data[8], m_blitter_data[9],
m_blitter_data[10], m_blitter_data[11],
m_blitter_data[12], m_blitter_data[13],
m_blitter_data[14], m_blitter_data[15]);
}
/* perform the blit */
perform_blit(space);
m_blit_in_progress = 1;
/* set a timer to go off when we're done */
m_blitter_done_timer->adjust(attotime::from_hz(12000000/4) * (BLITTER_WIDTH * BLITTER_HEIGHT + 12));
}
/* debugging */
if (FULL_LOGGING) logerror("%04x:blitter_w(%02x)=%02x\n", m_subcpu->pcbase(), offset, data);
}
/*************************************
*
* TMS34061 I/O
*
*************************************/
WRITE8_MEMBER(itech8_state::tms34061_w)
{
int func = (offset >> 9) & 7;
int col = offset & 0xff;
/* Column address (CA0-CA8) is hooked up the A0-A7, with A1 being inverted
during register access. CA8 is ignored */
if (func == 0 || func == 2)
col ^= 2;
/* Row address (RA0-RA8) is not dependent on the offset */
m_tms34061->write(space, col, 0xff, func, data);
}
READ8_MEMBER(itech8_state::tms34061_r)
{
int func = (offset >> 9) & 7;
int col = offset & 0xff;
/* Column address (CA0-CA8) is hooked up the A0-A7, with A1 being inverted
during register access. CA8 is ignored */
if (func == 0 || func == 2)
col ^= 2;
/* Row address (RA0-RA8) is not dependent on the offset */
return m_tms34061->read(space, col, 0xff, func);
}
/*************************************
*
* Special Grudge Match handlers
*
*************************************/
WRITE8_MEMBER(itech8_state::grmatch_palette_w)
{
/* set the palette control; examined in the scanline callback */
m_grmatch_palcontrol = data;
}
WRITE8_MEMBER(itech8_state::grmatch_xscroll_w)
{
/* update the X scroll value */
//m_screen->update_now();
m_screen->update_partial(m_screen->vpos());
m_grmatch_xscroll = data;
}
TIMER_DEVICE_CALLBACK_MEMBER(itech8_state::grmatch_palette_update)
{
/* if the high bit is set, we are supposed to latch the palette values */
if (m_grmatch_palcontrol & 0x80)
{
/* the TMS34070s latch at the start of the frame, based on the first few bytes */
uint32_t page_offset = (m_tms34061->m_display.dispstart & 0x0ffff) | m_grmatch_xscroll;
int page, x;
/* iterate over both pages */
for (page = 0; page < 2; page++)
{
const uint8_t *base = &m_tms34061->m_display.vram[(page * 0x20000 + page_offset) & VRAM_MASK];
for (x = 0; x < 16; x++)
{
uint8_t data0 = base[x * 2 + 0];
uint8_t data1 = base[x * 2 + 1];
m_grmatch_palette[page][x] = rgb_t(pal4bit(data0 >> 0), pal4bit(data1 >> 4), pal4bit(data1 >> 0));
}
}
}
}
/*************************************
*
* Main refresh
*
*************************************/
uint32_t itech8_state::screen_update_2layer(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
uint32_t page_offset;
int x, y;
const pen_t *pens = m_tlc34076->pens();
/* first get the current display state */
m_tms34061->get_display_state();
/* if we're blanked, just fill with black */
if (m_tms34061->blanked())
{
bitmap.fill(rgb_t::black(), cliprect);
return 0;
}
/* there are two layers: */
/* top layer @ 0x00000 is only 4bpp, colors come from the first 16 palettes */
/* bottom layer @ 0x20000 is full 8bpp */
page_offset = m_tms34061->m_display.dispstart & 0x0ffff;
for (y = cliprect.min_y; y <= cliprect.max_y; y++)
{
uint8_t *base0 = &m_tms34061->m_display.vram[(0x00000 + page_offset + y * 256) & VRAM_MASK];
uint8_t *base2 = &m_tms34061->m_display.vram[(0x20000 + page_offset + y * 256) & VRAM_MASK];
uint32_t *dest = &bitmap.pix32(y);
for (x = cliprect.min_x; x <= cliprect.max_x; x++)
{
int pix0 = base0[x] & 0x0f;
dest[x] = pens[pix0 ? pix0 : base2[x]];
}
}
return 0;
}
uint32_t itech8_state::screen_update_grmatch(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
uint32_t page_offset;
int x, y;
/* first get the current display state */
m_tms34061->get_display_state();
/* if we're blanked, just fill with black */
if (m_tms34061->blanked())
{
bitmap.fill(rgb_t::black(), cliprect);
return 0;
}
/* there are two layers: */
/* top layer @ 0x00000 is 4bpp, colors come from TMS34070, enabled via palette control */
/* bottom layer @ 0x20000 is 4bpp, colors come from TMS34070, enabled via palette control */
/* 4bpp pixels are packed 2 to a byte */
/* xscroll is set via a separate register */
page_offset = (m_tms34061->m_display.dispstart & 0x0ffff) | m_grmatch_xscroll;
for (y = cliprect.min_y; y <= cliprect.max_y; y++)
{
uint8_t *base0 = &m_tms34061->m_display.vram[0x00000 + ((page_offset + y * 256) & 0xffff)];
uint8_t *base2 = &m_tms34061->m_display.vram[0x20000 + ((page_offset + y * 256) & 0xffff)];
uint32_t *dest = &bitmap.pix32(y);
for (x = cliprect.min_x & ~1; x <= cliprect.max_x; x += 2)
{
uint8_t pix0 = base0[x / 2];
uint8_t pix2 = base2[x / 2];
if ((pix0 & 0xf0) != 0)
dest[x] = m_grmatch_palette[0][pix0 >> 4];
else
dest[x] = m_grmatch_palette[1][pix2 >> 4];
if ((pix0 & 0x0f) != 0)
dest[x + 1] = m_grmatch_palette[0][pix0 & 0x0f];
else
dest[x + 1] = m_grmatch_palette[1][pix2 & 0x0f];
}
}
return 0;
}
uint32_t itech8_state::screen_update_2page(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
uint32_t page_offset;
int x, y;
const pen_t *pens = m_tlc34076->pens();
/* first get the current display state */
m_tms34061->get_display_state();
/* if we're blanked, just fill with black */
if (m_tms34061->blanked())
{
bitmap.fill(rgb_t::black(), cliprect);
return 0;
}
/* there are two pages, each of which is a full 8bpp */
/* page index is selected by the top bit of the page_select register */
page_offset = ((m_page_select & 0x80) << 10) | (m_tms34061->m_display.dispstart & 0x0ffff);
for (y = cliprect.min_y; y <= cliprect.max_y; y++)
{
uint8_t *base = &m_tms34061->m_display.vram[(page_offset + y * 256) & VRAM_MASK];
uint32_t *dest = &bitmap.pix32(y);
for (x = cliprect.min_x; x <= cliprect.max_x; x++)
dest[x] = pens[base[x]];
}
return 0;
}
uint32_t itech8_state::screen_update_2page_large(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
uint32_t page_offset;
int x, y;
const pen_t *pens = m_tlc34076->pens();
/* first get the current display state */
m_tms34061->get_display_state();
/* if we're blanked, just fill with black */
if (m_tms34061->blanked())
{
bitmap.fill(rgb_t::black(), cliprect);
return 0;
}
/* there are two pages, each of which is a full 8bpp */
/* the low 4 bits come from the bitmap directly */
/* the upper 4 bits were latched on each write into a separate bitmap */
/* page index is selected by the top bit of the page_select register */
page_offset = ((~m_page_select & 0x80) << 10) | (m_tms34061->m_display.dispstart & 0x0ffff);
for (y = cliprect.min_y; y <= cliprect.max_y; y++)
{
uint8_t *base = &m_tms34061->m_display.vram[(page_offset + y * 256) & VRAM_MASK];
uint8_t *latch = &m_tms34061->m_display.latchram[(page_offset + y * 256) & VRAM_MASK];
uint32_t *dest = &bitmap.pix32(y);
for (x = cliprect.min_x & ~1; x <= cliprect.max_x; x += 2)
{
dest[x + 0] = pens[(latch[x/2] & 0xf0) | (base[x/2] >> 4)];
dest[x + 1] = pens[((latch[x/2] << 4) & 0xf0) | (base[x/2] & 0x0f)];
}
}
return 0;
}