/*************************************************************************** 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 "driver.h" #include "video/tms34061.h" #include "video/tlc34076.h" #include "cpu/m6809/m6809.h" #include "itech8.h" /************************************* * * Debugging * *************************************/ #define FULL_LOGGING 0 #define BLIT_LOGGING 0 /************************************* * * Blitter constants * *************************************/ #define BLITTER_ADDRHI blitter_data[0] #define BLITTER_ADDRLO blitter_data[1] #define BLITTER_FLAGS blitter_data[2] #define BLITTER_STATUS blitter_data[3] #define BLITTER_WIDTH blitter_data[4] #define BLITTER_HEIGHT blitter_data[5] #define BLITTER_MASK blitter_data[6] #define BLITTER_OUTPUT blitter_data[7] #define BLITTER_XSTART blitter_data[8] #define BLITTER_YCOUNT blitter_data[9] #define BLITTER_XSTOP blitter_data[10] #define BLITTER_YSKIP blitter_data[11] #define BLITFLAG_SHIFT 0x01 #define BLITFLAG_XFLIP 0x02 #define BLITFLAG_YFLIP 0x04 #define BLITFLAG_RLE 0x08 #define BLITFLAG_TRANSPARENT 0x10 /************************************* * * Global variables * *************************************/ UINT8 *itech8_grom_bank; static UINT8 blitter_data[16]; static UINT8 blit_in_progress; static UINT8 page_select; static offs_t fetch_offset; static UINT8 fetch_rle_count; static UINT8 fetch_rle_value; static UINT8 fetch_rle_literal; static struct tms34061_display tms_state; static UINT8 *grom_base; static UINT32 grom_size; /************************************* * * TMS34061 interfacing * *************************************/ static void generate_interrupt(int state) { itech8_update_interrupts(-1, state, -1); if (FULL_LOGGING && state) logerror("------------ DISPLAY INT (%d) --------------\n", video_screen_get_vpos(0)); } static struct tms34061_interface tms34061intf = { 0, /* the screen we are acting on */ 8, /* VRAM address is (row << rowshift) | col */ 0x40000, /* size of video RAM */ generate_interrupt /* interrupt gen callback */ }; /************************************* * * Video start * *************************************/ VIDEO_START( itech8 ) { /* initialize TMS34061 emulation */ tms34061_start(&tms34061intf); /* get the TMS34061 display state */ tms34061_get_display_state(&tms_state); /* reset statics */ page_select = 0xc0; /* fetch the GROM base */ grom_base = memory_region(REGION_GFX1); grom_size = memory_region_length(REGION_GFX1); } /************************************* * * Palette I/O * *************************************/ WRITE8_HANDLER( itech8_palette_w ) { tlc34076_w(offset/2, data); } /************************************* * * Paging control * *************************************/ WRITE8_HANDLER( itech8_page_w ) { video_screen_update_partial(0, video_screen_get_vpos(0)); logerror("%04x:display_page = %02X (%d)\n", activecpu_get_pc(), data, video_screen_get_vpos(0)); page_select = data; } /************************************* * * Blitter data fetchers * *************************************/ INLINE UINT8 fetch_next_raw(void) { return grom_base[fetch_offset++ % grom_size]; } INLINE void consume_raw(int count) { fetch_offset += count; } INLINE UINT8 fetch_next_rle(void) { if (fetch_rle_count == 0) { fetch_rle_count = grom_base[fetch_offset++ % grom_size]; fetch_rle_literal = fetch_rle_count & 0x80; fetch_rle_count &= 0x7f; if (!fetch_rle_literal) fetch_rle_value = grom_base[fetch_offset++ % grom_size]; } fetch_rle_count--; if (fetch_rle_literal) fetch_rle_value = grom_base[fetch_offset++ % grom_size]; return fetch_rle_value; } INLINE void consume_rle(int count) { while (count) { int num_to_consume; if (fetch_rle_count == 0) { fetch_rle_count = grom_base[fetch_offset++ % grom_size]; fetch_rle_literal = fetch_rle_count & 0x80; fetch_rle_count &= 0x7f; if (!fetch_rle_literal) fetch_rle_value = grom_base[fetch_offset++ % grom_size]; } num_to_consume = (count < fetch_rle_count) ? count : fetch_rle_count; count -= num_to_consume; fetch_rle_count -= num_to_consume; if (fetch_rle_literal) fetch_offset += num_to_consume; } } /************************************* * * Core blitter * *************************************/ static void perform_blit(void) { offs_t addr = tms_state.regs[TMS34061_XYADDRESS] | ((tms_state.regs[TMS34061_XYOFFSET] & 0x300) << 8); UINT8 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 = tms34061_latch_r(0); int width = BLITTER_WIDTH; int height = BLITTER_HEIGHT; UINT8 transmaskhi, transmasklo; UINT8 mask = BLITTER_MASK; UINT8 skip[3]; int x, y; /* debugging */ if (FULL_LOGGING) logerror("Blit: scan=%d src=%06x @ (%05x) for %dx%d ... flags=%02x\n", video_screen_get_vpos(0), (*itech8_grom_bank << 16) | (BLITTER_ADDRHI << 8) | BLITTER_ADDRLO, tms_state.regs[TMS34061_XYADDRESS] | ((tms_state.regs[TMS34061_XYOFFSET] & 0x300) << 8), BLITTER_WIDTH, BLITTER_HEIGHT, BLITTER_FLAGS); /* initialize the fetcher */ fetch_offset = (*itech8_grom_bank << 16) | (BLITTER_ADDRHI << 8) | BLITTER_ADDRLO; fetch_rle_count = 0; /* RLE starts with a couple of extra 0's */ if (rle) 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 &= 0x3ffff; 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 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); /* draw upper pixel */ if (!transparent || (pix & transmaskhi)) { tms_state.vram[addr] = (tms_state.vram[addr] & (0x0f << shift)) | ((pix & mask & 0xf0) >> shift); tms_state.latchram[addr] = (tms_state.latchram[addr] & (0x0f << shift)) | ((color & 0xf0) >> shift); } /* draw lower pixel */ if (!transparent || (pix & transmasklo)) { offs_t addr1 = addr + shift/4; tms_state.vram[addr1] = (tms_state.vram[addr1] & (0xf0 >> shift)) | ((pix & mask & 0x0f) << shift); tms_state.latchram[addr1] = (tms_state.latchram[addr1] & (0xf0 >> shift)) | ((color & 0x0f) << shift); } /* advance to the next byte */ addr += xdir; } /* 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 &= 0x3ffff; xdir = -xdir; } } /************************************* * * Blitter finished callback * *************************************/ static TIMER_CALLBACK( blitter_done ) { /* turn off blitting and generate an interrupt */ blit_in_progress = 0; itech8_update_interrupts(-1, -1, 1); if (FULL_LOGGING) logerror("------------ BLIT DONE (%d) --------------\n", video_screen_get_vpos(0)); } /************************************* * * Blitter I/O * *************************************/ READ8_HANDLER( itech8_blitter_r ) { int result = blitter_data[offset / 2]; /* debugging */ if (FULL_LOGGING) logerror("%04x:blitter_r(%02x)\n", activecpu_get_previouspc(), 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) { itech8_update_interrupts(-1, -1, 0); if (blit_in_progress) result |= 0x80; else result &= 0x7f; } /* a read from offsets 12-15 return input port values */ if (offset >= 12 && offset <= 15) result = readinputport(3 + offset - 12); return result; } WRITE8_HANDLER( itech8_blitter_w ) { /* low bit seems to be ignored */ offset /= 2; 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", (tms_state.regs[TMS34061_XYOFFSET] >> 8) & 0x0f, tms_state.regs[TMS34061_XYADDRESS], *itech8_grom_bank, blitter_data[0], blitter_data[1], blitter_data[4], blitter_data[5], blitter_data[2]); logerror(" %02X %02X %02X [%02X] %02X %02X %02X [%02X]-%02X %02X %02X %02X [%02X %02X %02X %02X]\n", blitter_data[0], blitter_data[1], blitter_data[2], blitter_data[3], blitter_data[4], blitter_data[5], blitter_data[6], blitter_data[7], blitter_data[8], blitter_data[9], blitter_data[10], blitter_data[11], blitter_data[12], blitter_data[13], blitter_data[14], blitter_data[15]); } /* perform the blit */ perform_blit(); blit_in_progress = 1; /* set a timer to go off when we're done */ mame_timer_set(scale_up_mame_time(MAME_TIME_IN_HZ(12000000/4), BLITTER_WIDTH * BLITTER_HEIGHT + 12), 0, blitter_done); } /* debugging */ if (FULL_LOGGING) logerror("%04x:blitter_w(%02x)=%02x\n", activecpu_get_previouspc(), offset, data); } /************************************* * * TMS34061 I/O * *************************************/ WRITE8_HANDLER( itech8_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 */ tms34061_w(col, 0xff, func, data); } READ8_HANDLER( itech8_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 tms34061_r(col, 0xff, func); } /************************************* * * Main refresh * *************************************/ VIDEO_UPDATE( itech8_2layer ) { UINT32 page_offset; int x, y; /* first get the current display state */ tms34061_get_display_state(&tms_state); /* if we're blanked, just fill with black */ if (tms_state.blanked) { fillbitmap(bitmap, get_black_pen(machine), 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 = tms_state.dispstart & 0x0ffff; for (y = cliprect->min_y; y <= cliprect->max_y; y++) { UINT8 *base0 = &tms_state.vram[(0x00000 + page_offset + y * 256) & 0x3ffff]; UINT8 *base2 = &tms_state.vram[(0x20000 + page_offset + y * 256) & 0x3ffff]; UINT16 *dest = BITMAP_ADDR16(bitmap, y, 0); for (x = cliprect->min_x; x <= cliprect->max_x; x++) { int pix0 = base0[x] & 0x0f; dest[x] = pix0 ? pix0 : base2[x]; } } return 0; } VIDEO_UPDATE( itech8_2page ) { UINT32 page_offset; int x, y; /* first get the current display state */ tms34061_get_display_state(&tms_state); /* if we're blanked, just fill with black */ if (tms_state.blanked) { fillbitmap(bitmap, get_black_pen(machine), 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 = ((page_select & 0x80) << 10) | (tms_state.dispstart & 0x0ffff); for (y = cliprect->min_y; y <= cliprect->max_y; y++) { UINT8 *base = &tms_state.vram[(page_offset + y * 256) & 0x3ffff]; UINT16 *dest = BITMAP_ADDR16(bitmap, y, 0); for (x = cliprect->min_x; x <= cliprect->max_x; x++) dest[x] = base[x]; } return 0; } VIDEO_UPDATE( itech8_2page_large ) { UINT32 page_offset; int x, y; /* first get the current display state */ tms34061_get_display_state(&tms_state); /* if we're blanked, just fill with black */ if (tms_state.blanked) { fillbitmap(bitmap, get_black_pen(machine), 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 = ((~page_select & 0x80) << 10) | (tms_state.dispstart & 0x0ffff); for (y = cliprect->min_y; y <= cliprect->max_y; y++) { UINT8 *base = &tms_state.vram[(page_offset + y * 256) & 0x3ffff]; UINT8 *latch = &tms_state.latchram[(page_offset + y * 256) & 0x3ffff]; UINT16 *dest = BITMAP_ADDR16(bitmap, y, 0); for (x = cliprect->min_x & ~1; x <= cliprect->max_x; x += 2) { dest[x + 0] = (latch[x/2] & 0xf0) | (base[x/2] >> 4); dest[x + 1] = ((latch[x/2] << 4) & 0xf0) | (base[x/2] & 0x0f); } } return 0; }