// license:BSD-3-Clause // copyright-holders:Ernesto Corvi, Mariusz Wojcieszek, Aaron Giles /*************************************************************************** Amiga hardware Driver by: Ernesto Corvi, Mariusz Wojcieszek, Aaron Giles ***************************************************************************/ #include "emu.h" #include "includes/amiga.h" /************************************* * * Debugging * *************************************/ #define LOG_COPPER 0 #define GUESS_COPPER_OFFSET 0 #define LOG_SPRITE_DMA 0 /************************************* * * Macros * *************************************/ #define COPPER_CYCLES_TO_PIXELS(x) (4 * (x)) /************************************* * * Tables * *************************************/ /* expand an 8-bit bit pattern into 16 bits, every other bit */ const uint16_t amiga_state::s_expand_byte[256] = { 0x0000, 0x0001, 0x0004, 0x0005, 0x0010, 0x0011, 0x0014, 0x0015, 0x0040, 0x0041, 0x0044, 0x0045, 0x0050, 0x0051, 0x0054, 0x0055, 0x0100, 0x0101, 0x0104, 0x0105, 0x0110, 0x0111, 0x0114, 0x0115, 0x0140, 0x0141, 0x0144, 0x0145, 0x0150, 0x0151, 0x0154, 0x0155, 0x0400, 0x0401, 0x0404, 0x0405, 0x0410, 0x0411, 0x0414, 0x0415, 0x0440, 0x0441, 0x0444, 0x0445, 0x0450, 0x0451, 0x0454, 0x0455, 0x0500, 0x0501, 0x0504, 0x0505, 0x0510, 0x0511, 0x0514, 0x0515, 0x0540, 0x0541, 0x0544, 0x0545, 0x0550, 0x0551, 0x0554, 0x0555, 0x1000, 0x1001, 0x1004, 0x1005, 0x1010, 0x1011, 0x1014, 0x1015, 0x1040, 0x1041, 0x1044, 0x1045, 0x1050, 0x1051, 0x1054, 0x1055, 0x1100, 0x1101, 0x1104, 0x1105, 0x1110, 0x1111, 0x1114, 0x1115, 0x1140, 0x1141, 0x1144, 0x1145, 0x1150, 0x1151, 0x1154, 0x1155, 0x1400, 0x1401, 0x1404, 0x1405, 0x1410, 0x1411, 0x1414, 0x1415, 0x1440, 0x1441, 0x1444, 0x1445, 0x1450, 0x1451, 0x1454, 0x1455, 0x1500, 0x1501, 0x1504, 0x1505, 0x1510, 0x1511, 0x1514, 0x1515, 0x1540, 0x1541, 0x1544, 0x1545, 0x1550, 0x1551, 0x1554, 0x1555, 0x4000, 0x4001, 0x4004, 0x4005, 0x4010, 0x4011, 0x4014, 0x4015, 0x4040, 0x4041, 0x4044, 0x4045, 0x4050, 0x4051, 0x4054, 0x4055, 0x4100, 0x4101, 0x4104, 0x4105, 0x4110, 0x4111, 0x4114, 0x4115, 0x4140, 0x4141, 0x4144, 0x4145, 0x4150, 0x4151, 0x4154, 0x4155, 0x4400, 0x4401, 0x4404, 0x4405, 0x4410, 0x4411, 0x4414, 0x4415, 0x4440, 0x4441, 0x4444, 0x4445, 0x4450, 0x4451, 0x4454, 0x4455, 0x4500, 0x4501, 0x4504, 0x4505, 0x4510, 0x4511, 0x4514, 0x4515, 0x4540, 0x4541, 0x4544, 0x4545, 0x4550, 0x4551, 0x4554, 0x4555, 0x5000, 0x5001, 0x5004, 0x5005, 0x5010, 0x5011, 0x5014, 0x5015, 0x5040, 0x5041, 0x5044, 0x5045, 0x5050, 0x5051, 0x5054, 0x5055, 0x5100, 0x5101, 0x5104, 0x5105, 0x5110, 0x5111, 0x5114, 0x5115, 0x5140, 0x5141, 0x5144, 0x5145, 0x5150, 0x5151, 0x5154, 0x5155, 0x5400, 0x5401, 0x5404, 0x5405, 0x5410, 0x5411, 0x5414, 0x5415, 0x5440, 0x5441, 0x5444, 0x5445, 0x5450, 0x5451, 0x5454, 0x5455, 0x5500, 0x5501, 0x5504, 0x5505, 0x5510, 0x5511, 0x5514, 0x5515, 0x5540, 0x5541, 0x5544, 0x5545, 0x5550, 0x5551, 0x5554, 0x5555 }; const uint16_t delay[256] = { 1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,1,1,1,1,0,0,0,0,0,0,0,0, /* 0x000 - 0x03e */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x040 - 0x05e */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x060 - 0x07e */ 0,0,0,0,1,1,1,1,1,1,1,1,0,0,0,0, /* 0x080 - 0x09e */ 1,1,0,0,0,0,0,0,1,1,0,0,0,0,0,0,1,1,0,0,0,0,0,0,1,1,0,0,0,0,0,0, /* 0x0a0 - 0x0de */ /* BPLxPTH/BPLxPTL */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x0e0 - 0x0fe */ /* BPLCON0-3,BPLMOD1-2 */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x100 - 0x11e */ /* SPRxPTH/SPRxPTL */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* 0x120 - 0x13e */ /* SPRxPOS/SPRxCTL/SPRxDATA/SPRxDATB */ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, /* 0x140 - 0x17e */ /* COLORxx */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, /* 0x180 - 0x1be */ /* RESERVED */ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 /* 0x1c0 - 0x1fe */ }; /************************************* * * 4-4-4 palette init * *************************************/ void amiga_state::amiga_palette(palette_device &palette) const { for (int i = 0; i < 0x1000; i++) palette.set_pen_color(i, pal4bit(i >> 8), pal4bit(i >> 4), pal4bit(i)); } /************************************* * * Video startup * *************************************/ VIDEO_START_MEMBER( amiga_state, amiga ) { int j; /* generate tables that produce the correct playfield color for dual playfield mode */ for (j = 0; j < 64; j++) { int pf1pix = ((j >> 0) & 1) | ((j >> 1) & 2) | ((j >> 2) & 4); int pf2pix = ((j >> 1) & 1) | ((j >> 2) & 2) | ((j >> 3) & 4); m_separate_bitplanes[0][j] = (pf1pix || !pf2pix) ? pf1pix : (pf2pix + 8); m_separate_bitplanes[1][j] = pf2pix ? (pf2pix + 8) : pf1pix; } #if GUESS_COPPER_OFFSET m_wait_offset = 3; #else (void)m_wait_offset; #endif /* reset the genlock color */ m_genlock_color = 0xffff; m_sprite_ctl_written = 0; m_screen->register_screen_bitmap(m_flickerfixer); } /************************************* * * Beam position * *************************************/ uint32_t amiga_state::amiga_gethvpos() { uint32_t hvpos = (m_last_scanline << 8) | (m_screen->hpos() >> 2); uint32_t latchedpos = m_hvpos.read_safe(0); /* if there's no latched position, or if we are in the active display area */ /* but before the latching point, return the live HV position */ if ((CUSTOM_REG(REG_BPLCON0) & 0x0008) == 0 || latchedpos == 0 || (m_last_scanline >= 20 && hvpos < latchedpos)) return hvpos; /* otherwise, return the latched position */ return latchedpos; } /************************************* * * Genlock interaction * *************************************/ void amiga_state::set_genlock_color(uint16_t color) { m_genlock_color = color; } /************************************* * * Copper emulation * *************************************/ void amiga_state::copper_setpc(uint32_t pc) { if (LOG_COPPER) logerror("copper_setpc(%06x)\n", pc); m_copper_pc = pc; m_copper_waiting = false; } int amiga_state::copper_execute_next(int xpos) { uint8_t ypos = m_last_scanline & 0xff; int word0, word1; /* bail if not enabled */ if ((CUSTOM_REG(REG_DMACON) & (DMACON_COPEN | DMACON_DMAEN)) != (DMACON_COPEN | DMACON_DMAEN)) return 511; /* flush any pending writes */ if (m_copper_pending_offset) { if (LOG_COPPER) logerror("%02X.%02X: Write to %s = %04x\n", m_last_scanline, xpos / 2, s_custom_reg_names[m_copper_pending_offset & 0xff], m_copper_pending_data); write_custom_chip(m_copper_pending_offset, m_copper_pending_data); m_copper_pending_offset = 0; } /* if we're waiting, check for a breakthrough */ if (m_copper_waiting) { int curpos = (ypos << 8) | (xpos >> 1); /* if we're past the wait time, stop it and hold up 2 cycles */ if ((curpos & m_copper_waitmask) >= (m_copper_waitval & m_copper_waitmask) && (!m_copper_waitblit || !(CUSTOM_REG(REG_DMACON) & DMACON_BBUSY))) { m_copper_waiting = false; #if GUESS_COPPER_OFFSET return xpos + COPPER_CYCLES_TO_PIXELS(1 + m_wait_offset); #else return xpos + COPPER_CYCLES_TO_PIXELS(1 + 3); #endif } /* otherwise, see if this line is even a possibility; if not, punt */ if (((curpos | 0xff) & m_copper_waitmask) < (m_copper_waitval & m_copper_waitmask)) return 511; /* else just advance another pixel */ xpos += COPPER_CYCLES_TO_PIXELS(1); return xpos; } /* fetch the first data word */ word0 = read_chip_ram(m_copper_pc); m_copper_pc += 2; xpos += COPPER_CYCLES_TO_PIXELS(1); /* fetch the second data word */ word1 = read_chip_ram(m_copper_pc); m_copper_pc += 2; xpos += COPPER_CYCLES_TO_PIXELS(1); if (LOG_COPPER) logerror("%02X.%02X: Copper inst @ %06x = %04x %04x\n", m_last_scanline, xpos / 2, m_copper_pc, word0, word1); /* handle a move */ if ((word0 & 1) == 0) { int min = (CUSTOM_REG(REG_COPCON) & 2) ? 0x20 : 0x40; /* do the write if we're allowed */ word0 = (word0 >> 1) & 0xff; if (word0 >= min) { if (delay[word0] == 0) { if (LOG_COPPER) logerror("%02X.%02X: Write to %s = %04x\n", m_last_scanline, xpos / 2, s_custom_reg_names[word0 & 0xff], word1); write_custom_chip(word0, word1); } else // additional 2 cycles needed for non-Agnus registers { m_copper_pending_offset = word0; m_copper_pending_data = word1; } } /* illegal writes suspend until next frame */ else { if (LOG_COPPER) logerror("%02X.%02X: Aborting copper on illegal write\n", m_last_scanline, xpos / 2); m_copper_waitval = 0xffff; m_copper_waitmask = 0xffff; m_copper_waitblit = false; m_copper_waiting = true; return 511; } } else { /* extract common wait/skip values */ m_copper_waitval = word0 & 0xfffe; #if 0 if (m_copper_waitval != 0xfffe) m_copper_waitval = (word0 & 0x00fe) | ((((word0 >> 8) & 0xff) + 1) << 8); #endif m_copper_waitmask = word1 | 0x8001; m_copper_waitblit = (~word1 >> 15) & 1; /* handle a wait */ if ((word1 & 1) == 0) { if (LOG_COPPER) logerror(" Waiting for %04x & %04x (currently %04x)\n", m_copper_waitval, m_copper_waitmask, (m_last_scanline << 8) | (xpos >> 1)); m_copper_waiting = true; } /* handle a skip */ else { int curpos = (ypos << 8) | (xpos >> 1); if (LOG_COPPER) logerror(" Skipping if %04x & %04x (currently %04x)\n", m_copper_waitval, m_copper_waitmask, (m_last_scanline << 8) | (xpos >> 1)); /* if we're past the wait time, stop it and hold up 2 cycles */ if ((curpos & m_copper_waitmask) >= (m_copper_waitval & m_copper_waitmask) && (!m_copper_waitblit || !(CUSTOM_REG(REG_DMACON) & DMACON_BBUSY))) { if (LOG_COPPER) logerror(" Skipped\n"); /* count the cycles it out have taken to fetch the next instruction */ m_copper_pc += 4; xpos += COPPER_CYCLES_TO_PIXELS(2); } } } /* advance and consume 8 cycles */ return xpos; } /************************************* * * External sprite controls * *************************************/ void amiga_state::sprite_dma_reset(int which) { if (LOG_SPRITE_DMA) logerror("sprite %d dma reset\n", which ); m_sprite_dma_reload_mask |= 1 << which; m_sprite_dma_live_mask |= 1 << which; } void amiga_state::sprite_enable_comparitor(int which, int enable) { if (LOG_SPRITE_DMA) logerror("sprite %d comparitor %sable\n", which, enable ? "en" : "dis" ); if (enable) { m_sprite_comparitor_enable_mask |= 1 << which; m_sprite_dma_live_mask &= ~(1 << which); } else { m_sprite_comparitor_enable_mask &= ~(1 << which); m_sprite_ctl_written |= (1 << which); } } /************************************* * * Per-scanline sprite fetcher * *************************************/ void amiga_state::fetch_sprite_data(int scanline, int sprite) { CUSTOM_REG(REG_SPR0DATA + 4 * sprite) = read_chip_ram(CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 0); CUSTOM_REG(REG_SPR0DATB + 4 * sprite) = read_chip_ram(CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 2); CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) += 4; if (LOG_SPRITE_DMA) logerror("%3d:sprite %d fetch: data=%04X-%04X\n", scanline, sprite, CUSTOM_REG(REG_SPR0DATA + 4 * sprite), CUSTOM_REG(REG_SPR0DATB + 4 * sprite)); } void amiga_state::update_sprite_dma(int scanline) { int dmaenable = (CUSTOM_REG(REG_DMACON) & (DMACON_SPREN | DMACON_DMAEN)) == (DMACON_SPREN | DMACON_DMAEN); int num, maxdma; /* channels are limited by DDFSTART */ maxdma = (CUSTOM_REG(REG_DDFSTRT) - 0x14) / 4; if (maxdma > 8) maxdma = 8; /* loop over sprite channels */ for (num = 0; num < maxdma; num++) { int bitmask = 1 << num; int vstart, vstop; /* if we are == VSTOP, fetch new control words */ if (dmaenable && (m_sprite_dma_live_mask & bitmask) && (m_sprite_dma_reload_mask & bitmask)) { /* disable the sprite */ m_sprite_comparitor_enable_mask &= ~bitmask; m_sprite_dma_reload_mask &= ~bitmask; /* fetch data into the control words */ CUSTOM_REG(REG_SPR0POS + 4 * num) = read_chip_ram(CUSTOM_REG_LONG(REG_SPR0PTH + 2 * num) + 0); CUSTOM_REG(REG_SPR0CTL + 4 * num) = read_chip_ram(CUSTOM_REG_LONG(REG_SPR0PTH + 2 * num) + 2); CUSTOM_REG_LONG(REG_SPR0PTH + 2 * num) += 4; if (LOG_SPRITE_DMA) logerror("%3d:sprite %d fetch: pos=%04X ctl=%04X\n", scanline, num, CUSTOM_REG(REG_SPR0POS + 4 * num), CUSTOM_REG(REG_SPR0CTL + 4 * num)); } /* compute vstart/vstop */ vstart = (CUSTOM_REG(REG_SPR0POS + 4 * num) >> 8) | ((CUSTOM_REG(REG_SPR0CTL + 4 * num) << 6) & 0x100); vstop = (CUSTOM_REG(REG_SPR0CTL + 4 * num) >> 8) | ((CUSTOM_REG(REG_SPR0CTL + 4 * num) << 7) & 0x100); /* if we hit vstart, enable the comparitor */ if (scanline == vstart) { m_sprite_comparitor_enable_mask |= 1 << num; if (LOG_SPRITE_DMA) logerror("%3d:sprite %d comparitor enable\n", scanline, num); } /* if we hit vstop, disable the comparitor and trigger a reload for the next scanline */ if (scanline == vstop) { m_sprite_ctl_written &= ~bitmask; m_sprite_comparitor_enable_mask &= ~bitmask; m_sprite_dma_reload_mask |= 1 << num; CUSTOM_REG(REG_SPR0DATA + 4 * num) = 0; /* just a guess */ CUSTOM_REG(REG_SPR0DATB + 4 * num) = 0; if (LOG_SPRITE_DMA) logerror("%3d:sprite %d comparitor disable, prepare for reload\n", scanline, num); } /* fetch data if this sprite is enabled */ if (dmaenable && (m_sprite_dma_live_mask & bitmask) && (m_sprite_comparitor_enable_mask & bitmask)) { fetch_sprite_data(scanline, num); } } } /************************************* * * Per-pixel sprite computations * *************************************/ uint32_t amiga_state::interleave_sprite_data(uint16_t lobits, uint16_t hibits) { return (s_expand_byte[lobits & 0xff] << 0) | (s_expand_byte[lobits >> 8] << 16) | (s_expand_byte[hibits & 0xff] << 1) | (s_expand_byte[hibits >> 8] << 17); } int amiga_state::get_sprite_pixel(int x) { int pixels = 0; int num, pair; /* loop over sprite channels */ for (num = 0; num < 8; num++) if (m_sprite_comparitor_enable_mask & (1 << num)) { /* if we're not currently clocking, check against hstart */ if (m_sprite_remain[num] == 0) { int hstart = ((CUSTOM_REG(REG_SPR0POS + 4 * num) & 0xff) << 1) | (CUSTOM_REG(REG_SPR0CTL + 4 * num) & 1); if (hstart == x) { m_sprite_remain[num] = 16; m_sprite_shiftreg[num] = interleave_sprite_data(CUSTOM_REG(REG_SPR0DATA + 4 * num), CUSTOM_REG(REG_SPR0DATB + 4 * num)); } } /* clock the next pixel if we're doing it */ if (m_sprite_remain[num] != 0) { m_sprite_remain[num]--; pixels |= (m_sprite_shiftreg[num] & 0xc0000000) >> (16 + 2 * (7 - num)); m_sprite_shiftreg[num] <<= 2; } } /* if we have pixels, determine the actual color and get out */ if (pixels) { static const uint16_t ormask[16] = { 0x0000, 0x000c, 0x00c0, 0x00cc, 0x0c00, 0x0c0c, 0x0cc0, 0x0ccc, 0xc000, 0xc00c, 0xc0c0, 0xc0cc, 0xcc00, 0xcc0c, 0xccc0, 0xcccc }; static const uint16_t spritecollide[16] = { 0x0000, 0x0000, 0x0000, 0x0200, 0x0000, 0x0400, 0x1000, 0x1600, 0x0000, 0x0800, 0x2000, 0x2a00, 0x4000, 0x4c00, 0x7000, 0x7e00 }; int collide; const int esprm = 0x10, osprm = 0x10; /* OR the two sprite bits together so we only have 1 bit per sprite */ collide = pixels | (pixels >> 1); /* based on the CLXCON, merge even/odd sprite results */ collide |= (collide & ormask[CUSTOM_REG(REG_CLXCON) >> 12]) >> 2; /* collapse down to a 4-bit final "sprite present" mask */ collide = (collide & 1) | ((collide >> 3) & 2) | ((collide >> 6) & 4) | ((collide >> 9) & 8); /* compute sprite-sprite collisions */ CUSTOM_REG(REG_CLXDAT) |= spritecollide[collide]; /* now determine the actual color */ for (pair = 0; pixels; pair++, pixels >>= 4) if (pixels & 0x0f) { /* final result is: topmost sprite color in bits 0-5 sprite present bitmask in bits 6-9 topmost sprite pair index in bits 10-11 */ uint32_t result = (collide << 6) | (pair << 10); /* attached case */ if (CUSTOM_REG(REG_SPR1CTL + 8 * pair) & 0x0080) return (pixels & 0xf) | osprm | result; /* lower-numbered sprite of pair */ else if (pixels & 3) return (pixels & 3) | esprm | (pair << 2) | result; /* higher-numbered sprite of pair */ else return ((pixels >> 2) & 3) | osprm | (pair << 2) | result; } } return 0; } /************************************* * * Bitplane assembly * *************************************/ uint8_t amiga_state::assemble_odd_bitplanes(int planes, int obitoffs) { uint8_t pix = (CUSTOM_REG(REG_BPL1DAT) >> obitoffs) & 1; if (planes >= 3) { pix |= ((CUSTOM_REG(REG_BPL3DAT) >> obitoffs) & 1) << 2; if (planes >= 5) pix |= ((CUSTOM_REG(REG_BPL5DAT) >> obitoffs) & 1) << 4; } return pix; } uint8_t amiga_state::assemble_even_bitplanes(int planes, int ebitoffs) { uint8_t pix = 0; if (planes >= 2) { pix |= ((CUSTOM_REG(REG_BPL2DAT) >> ebitoffs) & 1) << 1; if (planes >= 4) { pix |= ((CUSTOM_REG(REG_BPL4DAT) >> ebitoffs) & 1) << 3; if (planes >= 6) pix |= ((CUSTOM_REG(REG_BPL6DAT) >> ebitoffs) & 1) << 5; } } return pix; } void amiga_state::fetch_bitplane_data(int plane) { CUSTOM_REG(REG_BPL1DAT + plane) = read_chip_ram(CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2)); CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2) += 2; } /************************************* * * Hold and modify pixel computations * *************************************/ int amiga_state::update_ham(int newpix) { switch (newpix >> 4) { case 0: m_ham_color = CUSTOM_REG(REG_COLOR00 + (newpix & 0xf)); break; case 1: m_ham_color = (m_ham_color & 0xff0) | ((newpix & 0xf) << 0); break; case 2: m_ham_color = (m_ham_color & 0x0ff) | ((newpix & 0xf) << 8); break; case 3: m_ham_color = (m_ham_color & 0xf0f) | ((newpix & 0xf) << 4); break; } return m_ham_color; } //************************************************************************** // DISPLAY WINDOW //************************************************************************** void amiga_state::update_display_window() { int vstart = CUSTOM_REG(REG_DIWSTRT) >> 8; int vstop = CUSTOM_REG(REG_DIWSTOP) >> 8; int hstart = CUSTOM_REG(REG_DIWSTRT) & 0xff; int hstop = CUSTOM_REG(REG_DIWSTOP) & 0xff; if (m_diwhigh_valid) { vstart |= (CUSTOM_REG(REG_DIWHIGH) & 7) << 8; vstop |= ((CUSTOM_REG(REG_DIWHIGH) >> 8) & 7) << 8; hstart |= ((CUSTOM_REG(REG_DIWHIGH) >> 5) & 1) << 8; hstop |= ((CUSTOM_REG(REG_DIWHIGH) >> 13) & 1) << 8; } else { vstop |= ((~CUSTOM_REG(REG_DIWSTOP) >> 7) & 0x100); hstop |= 0x100; } if (hstop < hstart) { hstart = 0x00; hstop = 0x1ff; } m_diw.set(hstart, hstop, vstart, vstop); } /************************************* * * Single scanline rasterizer * *************************************/ void amiga_state::render_scanline(bitmap_rgb32 &bitmap, int scanline) { uint16_t save_color0 = CUSTOM_REG(REG_COLOR00); int ddf_start_pixel = 0, ddf_stop_pixel = 0; int hires = 0, dualpf = 0, ham = 0; int pf1pri = 0, pf2pri = 0; int planes = 0; uint32_t *dst = nullptr; int ebitoffs = 0, obitoffs = 0; int ecolmask = 0, ocolmask = 0; int edelay = 0, odelay = 0; int next_copper_x; int pl; const int defbitoffs = 15; int save_scanline = scanline; // we need to do a bit more work on the first scanline if (scanline == 0) { m_previous_lof = CUSTOM_REG(REG_VPOSR) & VPOSR_LOF; // toggle lof if enabled if (CUSTOM_REG(REG_BPLCON0) & BPLCON0_LACE) CUSTOM_REG(REG_VPOSR) ^= VPOSR_LOF; // reset copper and ham color copper_setpc(CUSTOM_REG_LONG(REG_COP1LCH)); m_ham_color = CUSTOM_REG(REG_COLOR00); } // in visible area? if (bitmap.valid()) { bool lof = CUSTOM_REG(REG_VPOSR) & VPOSR_LOF; if ((scanline & 1) ^ lof) { // lof matches? then render this scanline dst = &bitmap.pix32(scanline); } else { // lof doesn't match, we don't render this scanline // if we didn't switch lof we have a full non-interlace screen, // so we fill the black gaps with the contents of the previous scanline // otherwise just render the contents of the previous frame's scanline int shift = (m_previous_lof == lof) ? 1 : 0; std::copy_n(&m_flickerfixer.pix32(scanline - shift), amiga_state::SCREEN_WIDTH, &bitmap.pix32(scanline)); return; } } scanline /= 2; m_last_scanline = scanline; /* update sprite data fetching */ update_sprite_dma(scanline); /* all sprites off at the start of the line */ memset(m_sprite_remain, 0, sizeof(m_sprite_remain)); /* temporary set color 0 to the genlock color */ if (m_genlock_color != 0xffff) CUSTOM_REG(REG_COLOR00) = m_genlock_color; /* loop over the line */ next_copper_x = 0; for (int x = 0; x < amiga_state::SCREEN_WIDTH / 2; x++) { int sprpix; /* time to execute the copper? */ if (x == next_copper_x) { /* execute the next batch, restoring and re-saving color 0 around it */ CUSTOM_REG(REG_COLOR00) = save_color0; next_copper_x = copper_execute_next(x); save_color0 = CUSTOM_REG(REG_COLOR00); if (m_genlock_color != 0xffff) CUSTOM_REG(REG_COLOR00) = m_genlock_color; /* compute update-related register values */ planes = (CUSTOM_REG(REG_BPLCON0) & (BPLCON0_BPU0 | BPLCON0_BPU1 | BPLCON0_BPU2)) >> 12; hires = CUSTOM_REG(REG_BPLCON0) & BPLCON0_HIRES; ham = CUSTOM_REG(REG_BPLCON0) & BPLCON0_HOMOD; dualpf = CUSTOM_REG(REG_BPLCON0) & BPLCON0_DBLPF; /* compute the pixel fetch parameters */ ddf_start_pixel = (CUSTOM_REG(REG_DDFSTRT) & (hires ? 0xfc : 0xf8)) * 2; ddf_start_pixel += hires ? 9 : 17; ddf_stop_pixel = (CUSTOM_REG(REG_DDFSTOP) & (hires ? 0xfc : 0xf8)) * 2; ddf_stop_pixel += hires ? (9 + defbitoffs) : (17 + defbitoffs); if ( ( CUSTOM_REG(REG_DDFSTRT) ^ CUSTOM_REG(REG_DDFSTOP) ) & 0x04 ) ddf_stop_pixel += 8; // display window update_display_window(); /* extract playfield priorities */ pf1pri = CUSTOM_REG(REG_BPLCON2) & 7; pf2pri = (CUSTOM_REG(REG_BPLCON2) >> 3) & 7; /* extract collision masks */ ocolmask = (CUSTOM_REG(REG_CLXCON) >> 6) & 0x15; ecolmask = (CUSTOM_REG(REG_CLXCON) >> 6) & 0x2a; } /* clear the target pixels to the background color as a starting point */ if (dst != nullptr) dst[x*2+0] = dst[x*2+1] = m_palette->pen(CUSTOM_REG(REG_COLOR00)); /* if we hit the first fetch pixel, reset the counters and latch the delays */ if (x == ddf_start_pixel) { odelay = CUSTOM_REG(REG_BPLCON1) & 0xf; edelay = ( CUSTOM_REG(REG_BPLCON1) >> 4 ) & 0x0f; if ( hires ) { obitoffs = defbitoffs + ( odelay << 1 ); ebitoffs = defbitoffs + ( edelay << 1 ); } else { if ( CUSTOM_REG(REG_DDFSTRT) & 0x04 ) { odelay = ( odelay + 8 ) & 0x0f; edelay = ( edelay + 8 ) & 0x0f; } obitoffs = defbitoffs + odelay; ebitoffs = defbitoffs + edelay; } for (pl = 0; pl < 6; pl++) CUSTOM_REG(REG_BPL1DAT + pl) = 0; } /* need to run the sprite engine every pixel to ensure display */ sprpix = get_sprite_pixel(x); /* to render, we must have bitplane DMA enabled, at least 1 plane, and be within the */ /* vertical display window */ if ((CUSTOM_REG(REG_DMACON) & (DMACON_BPLEN | DMACON_DMAEN)) == (DMACON_BPLEN | DMACON_DMAEN) && planes > 0 && scanline >= m_diw.top() && scanline < m_diw.bottom()) { int pfpix0 = 0, pfpix1 = 0, collide; /* fetch the odd bits if we are within the fetching region */ if (x >= ddf_start_pixel && x <= ddf_stop_pixel + odelay) { /* if we need to fetch more data, do it now */ if (obitoffs == defbitoffs) { for (pl = 0; pl < planes; pl += 2) { fetch_bitplane_data(pl); } } /* now assemble the bits */ pfpix0 |= assemble_odd_bitplanes(planes, obitoffs); obitoffs--; /* for high res, assemble a second set of bits */ if (hires) { /* reset bit offsets and fetch more data if needed */ if (obitoffs < 0) { obitoffs = defbitoffs; for (pl = 0; pl < planes; pl += 2) { fetch_bitplane_data(pl); } } pfpix1 |= assemble_odd_bitplanes(planes, obitoffs); obitoffs--; } else pfpix1 |= pfpix0 & 0x15; /* reset bit offsets if needed */ if (obitoffs < 0) obitoffs = defbitoffs; } /* fetch the even bits if we are within the fetching region */ if (x >= ddf_start_pixel && x <= ddf_stop_pixel + edelay) { /* if we need to fetch more data, do it now */ if (ebitoffs == defbitoffs) { for (pl = 1; pl < planes; pl += 2) { fetch_bitplane_data(pl); } } /* now assemble the bits */ pfpix0 |= assemble_even_bitplanes(planes, ebitoffs); ebitoffs--; /* for high res, assemble a second set of bits */ if (hires) { /* reset bit offsets and fetch more data if needed */ if (ebitoffs < 0) { ebitoffs = defbitoffs; for (pl = 1; pl < planes; pl += 2) { fetch_bitplane_data(pl); } } pfpix1 |= assemble_even_bitplanes(planes, ebitoffs); ebitoffs--; } else pfpix1 |= pfpix0 & 0x2a; /* reset bit offsets if needed */ if (ebitoffs < 0) ebitoffs = defbitoffs; } /* compute playfield/sprite collisions for first pixel */ collide = pfpix0 ^ CUSTOM_REG(REG_CLXCON); if ((collide & ocolmask) == 0) CUSTOM_REG(REG_CLXDAT) |= (sprpix >> 5) & 0x01e; if ((collide & ecolmask) == 0) CUSTOM_REG(REG_CLXDAT) |= (sprpix >> 1) & 0x1e0; if ((collide & (ecolmask | ocolmask)) == 0) CUSTOM_REG(REG_CLXDAT) |= 0x001; /* compute playfield/sprite collisions for second pixel */ collide = pfpix1 ^ CUSTOM_REG(REG_CLXCON); if ((collide & ocolmask) == 0) CUSTOM_REG(REG_CLXDAT) |= (sprpix >> 5) & 0x01e; if ((collide & ecolmask) == 0) CUSTOM_REG(REG_CLXDAT) |= (sprpix >> 1) & 0x1e0; if ((collide & (ecolmask | ocolmask)) == 0) CUSTOM_REG(REG_CLXDAT) |= 0x001; /* if we are within the display region, render */ if (dst != nullptr && x >= m_diw.left() && x < m_diw.right()) { int pix, pri; /* hold-and-modify mode -- assume low-res (hi-res not supported by the hardware) */ if (ham) { /* update the HAM color */ pfpix0 = update_ham(pfpix0); pix = sprpix & 0x1f; pri = (sprpix >> 10); /* sprite has priority */ if (sprpix && pf1pri > pri) { dst[x*2+0] = dst[x*2+1] = m_palette->pen(CUSTOM_REG(REG_COLOR00 + pix)); } /* playfield has priority */ else { dst[x*2+0] = dst[x*2+1] = m_palette->pen(pfpix0); } } /* dual playfield mode */ else if (dualpf) { /* mask out the sprite if it doesn't have priority */ pix = sprpix & 0x1f; pri = (sprpix >> 10); if (pix) { if ((pfpix0 & 0x15) && pf1pri <= pri) pix = 0; if ((pfpix0 & 0x2a) && pf2pri <= pri) pix = 0; } /* write out the left pixel */ if (pix) dst[x*2+0] = m_palette->pen(CUSTOM_REG(REG_COLOR00 + pix)); else dst[x*2+0] = m_palette->pen(CUSTOM_REG(REG_COLOR00 + m_separate_bitplanes[(CUSTOM_REG(REG_BPLCON2) >> 6) & 1][pfpix0])); /* mask out the sprite if it doesn't have priority */ pix = sprpix & 0x1f; if (pix) { if ((pfpix1 & 0x15) && pf1pri <= pri) pix = 0; if ((pfpix1 & 0x2a) && pf2pri <= pri) pix = 0; } /* write out the right pixel */ if (pix) dst[x*2+1] = m_palette->pen(CUSTOM_REG(REG_COLOR00 + pix)); else dst[x*2+1] = m_palette->pen(CUSTOM_REG(REG_COLOR00 + m_separate_bitplanes[(CUSTOM_REG(REG_BPLCON2) >> 6) & 1][pfpix1])); } /* single playfield mode */ else { pix = sprpix & 0x1f; pri = (sprpix >> 10); /* sprite has priority */ if (sprpix && pf1pri > pri) { dst[x*2+0] = dst[x*2+1] = m_palette->pen(CUSTOM_REG(REG_COLOR00 + pix)); } /* playfield has priority */ else { dst[x*2+0] = m_palette->pen(CUSTOM_REG(REG_COLOR00 + pfpix0)); dst[x*2+1] = m_palette->pen(CUSTOM_REG(REG_COLOR00 + pfpix1)); } } } } } // end of the line: time to add the modulos if (scanline >= m_diw.top() && scanline < m_diw.bottom()) { // update odd planes for (pl = 0; pl < planes; pl += 2) CUSTOM_REG_LONG(REG_BPL1PTH + pl * 2) += CUSTOM_REG_SIGNED(REG_BPL1MOD); // update even planes for (pl = 1; pl < planes; pl += 2) CUSTOM_REG_LONG(REG_BPL1PTH + pl * 2) += CUSTOM_REG_SIGNED(REG_BPL2MOD); } // restore color00 CUSTOM_REG(REG_COLOR00) = save_color0; // save if (dst != nullptr) std::copy_n(dst, amiga_state::SCREEN_WIDTH, &m_flickerfixer.pix32(save_scanline)); #if GUESS_COPPER_OFFSET if (m_screen->frame_number() % 64 == 0 && scanline == 0) { if (machine().input().code_pressed(KEYCODE_Q)) popmessage("%d", m_wait_offset -= 1); if (machine().input().code_pressed(KEYCODE_W)) popmessage("%d", m_wait_offset += 1); } #endif } /************************************* * * Update * *************************************/ uint32_t amiga_state::screen_update_amiga(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect) { // sometimes the core tells us to render a bunch of lines to keep up (resolution change, for example) // this causes trouble for us since it can happen at any time if (cliprect.top() != cliprect.bottom()) return 0; // render each scanline in the visible region for (int y = cliprect.top(); y <= cliprect.bottom(); y++) render_scanline(bitmap, y); return 0; } void amiga_state::update_screenmode() { bool pal; // first let's see if we're PAL or NTSC if (m_agnus_id >= AGNUS_HR_PAL) // we support dynamic switching between PAL and NTSC, determine mode from register pal = CUSTOM_REG(REG_BEAMCON0) & 0x20; else // old agnus, agnus id determines PAL or NTSC pal = !(m_agnus_id & 0x10); // basic height & vblank length int height = pal ? SCREEN_HEIGHT_PAL : SCREEN_HEIGHT_NTSC; int vblank = pal ? VBLANK_PAL : VBLANK_NTSC; // frame period attoseconds_t period = HZ_TO_ATTOSECONDS(m_screen->clock()) * SCREEN_WIDTH * height; // adjust visible area rectangle visarea = m_screen->visible_area(); visarea.sety(vblank, height - 1); // finally set our new mode m_screen->configure(SCREEN_WIDTH, height, visarea, period); } //************************************************************************** // MACHINE DRIVER FRAGMENTS //************************************************************************** void amiga_state::pal_video(machine_config &config) { SCREEN(config, m_screen, SCREEN_TYPE_RASTER); m_screen->set_raw ( (amiga_state::CLK_28M_PAL / 4) * 2 * 2, amiga_state::SCREEN_WIDTH, amiga_state::HBLANK, amiga_state::SCREEN_WIDTH, amiga_state::SCREEN_HEIGHT_PAL, amiga_state::VBLANK_PAL, amiga_state::SCREEN_HEIGHT_PAL ); m_screen->set_screen_update(FUNC(amiga_state::screen_update_amiga)); } void amiga_state::ntsc_video(machine_config &config) { SCREEN(config, m_screen, SCREEN_TYPE_RASTER); m_screen->set_raw ( (amiga_state::CLK_28M_NTSC / 4) * 2 * 2, amiga_state::SCREEN_WIDTH, amiga_state::HBLANK, amiga_state::SCREEN_WIDTH, amiga_state::SCREEN_HEIGHT_NTSC, amiga_state::VBLANK_NTSC, amiga_state::SCREEN_HEIGHT_NTSC ); m_screen->set_screen_update(FUNC(amiga_state::screen_update_amiga)); }