/*************************************************************************** Amiga hardware Driver by: Ernesto Corvi, Mariusz Wojcieszek, Aaron Giles ***************************************************************************/ #include "driver.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)) /************************************* * * Statics * *************************************/ /* sprite states */ static UINT8 sprite_comparitor_enable_mask; static UINT8 sprite_dma_reload_mask; static UINT8 sprite_dma_live_mask; static UINT32 sprite_shiftreg[8]; static UINT8 sprite_remain[8]; /* playfield states */ static int last_scanline; static UINT16 ham_color; /* copper states */ static UINT32 copper_pc; static UINT8 copper_waiting; static UINT8 copper_waitblit; static UINT16 copper_waitval; static UINT16 copper_waitmask; static UINT16 copper_pending_offset; static UINT16 copper_pending_data; /* misc states */ static UINT16 genlock_color; #if GUESS_COPPER_OFFSET static int wait_offset = 3; #endif /************************************* * * Tables * *************************************/ /* expand an 8-bit bit pattern into 16 bits, every other bit */ static const UINT16 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 }; /* separate 6 in-order bitplanes into 2 x 3-bit bitplanes in two nibbles */ static UINT8 separate_bitplanes[2][64]; /************************************* * * 4-4-4 palette init * *************************************/ PALETTE_INIT( amiga ) { int i; for (i = 0; i < 0x1000; i++) palette_set_color_rgb(machine, i, pal4bit(i >> 8), pal4bit(i >> 4), pal4bit(i)); } /************************************* * * Video startup * *************************************/ VIDEO_START( 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); separate_bitplanes[0][j] = (pf1pix || !pf2pix) ? pf1pix : (pf2pix + 8); separate_bitplanes[1][j] = pf2pix ? (pf2pix + 8) : pf1pix; } /* reset the genlock color */ genlock_color = 0xffff; video_start_generic_bitmapped(machine); } /************************************* * * Beam position * *************************************/ UINT32 amiga_gethvpos(void) { UINT32 hvpos = (last_scanline << 8) | (video_screen_get_hpos(0) >> 2); UINT32 latchedpos = readinputportbytag_safe("HVPOS", 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 || (last_scanline >= 20 && hvpos < latchedpos)) return hvpos; /* otherwise, return the latched position */ return latchedpos; } /************************************* * * Genlock interaction * *************************************/ void amiga_set_genlock_color(UINT16 color) { genlock_color = color; } /************************************* * * Copper emulation * *************************************/ void copper_setpc(UINT32 pc) { if (LOG_COPPER) logerror("copper_setpc(%06x)\n", pc); copper_pc = pc; copper_waiting = FALSE; } static int copper_execute_next(int xpos) { 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 (copper_pending_offset) { if (LOG_COPPER) logerror("%02X.%02X: Write to %s = %04x\n", last_scanline, xpos / 2, amiga_custom_names[copper_pending_offset & 0xff], copper_pending_data); amiga_custom_w(copper_pending_offset, copper_pending_data, 0); copper_pending_offset = 0; } /* if we're waiting, check for a breakthrough */ if (copper_waiting) { int curpos = (last_scanline << 8) | (xpos >> 1); /* if we're past the wait time, stop it and hold up 2 cycles */ if ((curpos & copper_waitmask) >= (copper_waitval & copper_waitmask) && (!copper_waitblit || !(CUSTOM_REG(REG_DMACON) & DMACON_BBUSY))) { copper_waiting = FALSE; #if GUESS_COPPER_OFFSET return xpos + COPPER_CYCLES_TO_PIXELS(1 + 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) & copper_waitmask) < (copper_waitval & copper_waitmask)) return 511; /* else just advance another pixel */ xpos += COPPER_CYCLES_TO_PIXELS(1); return xpos; } /* fetch the first data word */ word0 = amiga_chip_ram_r(copper_pc); copper_pc += 2; xpos += COPPER_CYCLES_TO_PIXELS(1); /* fetch the second data word */ word1 = amiga_chip_ram_r(copper_pc); copper_pc += 2; xpos += COPPER_CYCLES_TO_PIXELS(1); if (LOG_COPPER) logerror("%02X.%02X: Copper inst @ %06x = %04x %04x\n", last_scanline, xpos / 2, 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) { /* write it at the *end* of this instruction's cycles */ /* needed for Arcadia's Fast Break */ copper_pending_offset = word0; copper_pending_data = word1; } /* illegal writes suspend until next frame */ else { if (LOG_COPPER) logerror("%02X.%02X: Aborting copper on illegal write\n", last_scanline, xpos / 2); copper_waitval = 0xffff; copper_waitmask = 0xffff; copper_waitblit = FALSE; copper_waiting = TRUE; return 511; } } else { /* extract common wait/skip values */ copper_waitval = word0 & 0xfffe; copper_waitmask = word1 | 0x8001; copper_waitblit = (~word1 >> 15) & 1; /* handle a wait */ if ((word1 & 1) == 0) { if (LOG_COPPER) logerror(" Waiting for %04x & %04x (currently %04x)\n", copper_waitval, copper_waitmask, (last_scanline << 8) | (xpos >> 1)); copper_waiting = TRUE; } /* handle a skip */ else { int curpos = (last_scanline << 8) | (xpos >> 1); if (LOG_COPPER) logerror(" Skipping if %04x & %04x (currently %04x)\n", copper_waitval, copper_waitmask, (last_scanline << 8) | (xpos >> 1)); /* if we're past the wait time, stop it and hold up 2 cycles */ if ((curpos & copper_waitmask) >= (copper_waitval & copper_waitmask) && (!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 */ copper_pc += 4; xpos += COPPER_CYCLES_TO_PIXELS(2); } } } /* advance and consume 8 cycles */ return xpos; } /************************************* * * External sprite controls * *************************************/ void amiga_sprite_dma_reset(int which) { sprite_dma_reload_mask |= 1 << which; sprite_dma_live_mask |= 1 << which; } void amiga_sprite_enable_comparitor(int which, int enable) { if (enable) { sprite_comparitor_enable_mask |= 1 << which; sprite_dma_live_mask &= ~(1 << which); } else sprite_comparitor_enable_mask &= ~(1 << which); } /************************************* * * Per-scanline sprite fetcher * *************************************/ static void 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 && (sprite_dma_live_mask & bitmask) && (sprite_dma_reload_mask & bitmask)) { /* disable the sprite */ sprite_comparitor_enable_mask &= ~bitmask; sprite_dma_reload_mask &= ~bitmask; /* fetch data into the control words */ CUSTOM_REG(REG_SPR0POS + 4 * num) = amiga_chip_ram_r(CUSTOM_REG_LONG(REG_SPR0PTH + 2 * num) + 0); CUSTOM_REG(REG_SPR0CTL + 4 * num) = amiga_chip_ram_r(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) { 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) { sprite_comparitor_enable_mask &= ~bitmask; 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 && (sprite_dma_live_mask & bitmask) && (sprite_comparitor_enable_mask & bitmask)) { CUSTOM_REG(REG_SPR0DATA + 4 * num) = amiga_chip_ram_r(CUSTOM_REG_LONG(REG_SPR0PTH + 2 * num) + 0); CUSTOM_REG(REG_SPR0DATB + 4 * num) = amiga_chip_ram_r(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: data=%04X-%04X\n", scanline, num, CUSTOM_REG(REG_SPR0DATA + 4 * num), CUSTOM_REG(REG_SPR0DATB + 4 * num)); } } } /************************************* * * Per-pixel sprite computations * *************************************/ INLINE UINT32 interleave_sprite_data(UINT16 lobits, UINT16 hibits) { return (expand_byte[lobits & 0xff] << 0) | (expand_byte[lobits >> 8] << 16) | (expand_byte[hibits & 0xff] << 1) | (expand_byte[hibits >> 8] << 17); } static int get_sprite_pixel(int x) { int pixels = 0; int num, pair; /* loop over sprite channels */ for (num = 0; num < 8; num++) if (sprite_comparitor_enable_mask & (1 << num)) { /* if we're not currently clocking, check against hstart */ if (sprite_remain[num] == 0) { int hstart = ((CUSTOM_REG(REG_SPR0POS + 4 * num) & 0xff) << 1) | (CUSTOM_REG(REG_SPR0CTL + 4 * num) & 1); if (hstart == x) { sprite_remain[num] = 16; 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 (sprite_remain[num] != 0) { sprite_remain[num]--; pixels |= (sprite_shiftreg[num] & 0xc0000000) >> (16 + 2 * (7 - num)); sprite_shiftreg[num] <<= 2; } } /* if we have pixels, determine the actual color and get out */ if (pixels) { static const UINT16 ormask[16] = { 0x0000, 0x000c, 0x00c0, 0x00cc, 0x0c00, 0x0c0c, 0x0cc0, 0x0ccc, 0xc000, 0xc00c, 0xc0c0, 0xc0cc, 0xcc00, 0xcc0c, 0xccc0, 0xcccc }; static const UINT16 spritecollide[16] = { 0x0000, 0x0000, 0x0000, 0x0200, 0x0000, 0x0400, 0x1000, 0x1600, 0x0000, 0x0800, 0x2000, 0x2a00, 0x4000, 0x4c00, 0x7000, 0x7e00 }; int collide; /* 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 */ /* attached case */ if (CUSTOM_REG(REG_SPR1CTL + 8 * pair) & 0x0080) return (pixels & 0xf) | 0x10 | (collide << 6) | (pair << 10); /* lower-numbered sprite of pair */ else if (pixels & 3) return (pixels & 3) | 0x10 | (pair << 2) | (collide << 6) | (pair << 10); /* higher-numbered sprite of pair */ else return ((pixels >> 2) & 3) | 0x10 | (pair << 2) | (collide << 6) | (pair << 10); } } return 0; } /************************************* * * Bitplane assembly * *************************************/ INLINE UINT8 assemble_odd_bitplanes(int planes, int obitoffs) { UINT8 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; } INLINE UINT8 assemble_even_bitplanes(int planes, int ebitoffs) { UINT8 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; } /************************************* * * Hold and modify pixel computations * *************************************/ INLINE int update_ham(int newpix) { switch (newpix >> 4) { case 0: ham_color = CUSTOM_REG(REG_COLOR00 + (newpix & 0xf)); break; case 1: ham_color = (ham_color & 0xff0) | ((newpix & 0xf) << 0); break; case 2: ham_color = (ham_color & 0x0ff) | ((newpix & 0xf) << 8); break; case 3: ham_color = (ham_color & 0xf0f) | ((newpix & 0xf) << 4); break; } return ham_color; } /************************************* * * Single scanline rasterizer * *************************************/ void amiga_render_scanline(int scanline) { UINT16 save_color0 = CUSTOM_REG(REG_COLOR00); int ddf_start_pixel = 0, ddf_stop_pixel = 0; int hires = 0, dualpf = 0, lace = 0, ham = 0; int hstart = 0, hstop = 0; int vstart = 0, vstop = 0; int pf1pri = 0, pf2pri = 0; int planes = 0; int x; UINT16 *dst; int ebitoffs = 0, obitoffs = 0; int ecolmask = 0, ocolmask = 0; int edelay = 0, odelay = 0; int next_copper_x; int p; last_scanline = scanline; /* on the first scanline, reset the COPPER and HAM color */ if (scanline == 0) { copper_setpc(CUSTOM_REG_LONG(REG_COP1LCH)); ham_color = CUSTOM_REG(REG_COLOR00); } /* update sprite data fetching */ update_sprite_dma(scanline); /* start of a new line, signal we're not done with it and fill up vars */ dst = BITMAP_ADDR16(tmpbitmap, scanline, 0); /* all sprites off at the start of the line */ memset(sprite_remain, 0, sizeof(sprite_remain)); /* temporary set color 0 to the genlock color */ if (genlock_color != 0xffff) CUSTOM_REG(REG_COLOR00) = genlock_color; /* loop over the line */ next_copper_x = 2; /* copper runs on odd timeslots */ for (x = 0; x < 0xe4*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 (genlock_color != 0xffff) CUSTOM_REG(REG_COLOR00) = 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; lace = CUSTOM_REG(REG_BPLCON0) & BPLCON0_LACE; /* compute the pixel fetch parameters */ ddf_start_pixel = ( CUSTOM_REG(REG_DDFSTRT) & 0xfc ) * 2 + (hires ? 9 : 17); ddf_stop_pixel = ( CUSTOM_REG(REG_DDFSTOP) & 0xfc ) * 2 + (hires ? (9 + 15) : (17 + 15)); if ( ( CUSTOM_REG(REG_DDFSTRT) ^ CUSTOM_REG(REG_DDFSTOP) ) & 0x04 ) ddf_stop_pixel += 8; /* compute the horizontal start/stop */ hstart = CUSTOM_REG(REG_DIWSTRT) & 0xff; hstop = 0x100 + (CUSTOM_REG(REG_DIWSTOP) & 0xff); /* compute the vertical start/stop */ vstart = CUSTOM_REG(REG_DIWSTRT) >> 8; vstop = (CUSTOM_REG(REG_DIWSTOP) >> 8) | ((~CUSTOM_REG(REG_DIWSTOP) >> 7) & 0x100); /* 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 */ dst[x*2+0] = dst[x*2+1] = 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 = 15 + ( odelay << 1 ); ebitoffs = 15 + ( edelay << 1 ); } else { if ( CUSTOM_REG(REG_DDFSTRT) & 0x04 ) { odelay = ( odelay + 8 ) & 0x0f; edelay = ( edelay + 8 ) & 0x0f; } obitoffs = 15 + odelay; ebitoffs = 15 + edelay; } for (p = 0; p < 6; p++) CUSTOM_REG(REG_BPL1DAT + p) = 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 >= vstart && scanline < vstop) { 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 == 15) for (p = 0; p < planes; p += 2) { CUSTOM_REG(REG_BPL1DAT + p) = amiga_chip_ram_r(CUSTOM_REG_LONG(REG_BPL1PTH + p * 2)); CUSTOM_REG_LONG(REG_BPL1PTH + p * 2) += 2; } /* 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 = 15; for (p = 0; p < planes; p += 2) { CUSTOM_REG(REG_BPL1DAT + p) = amiga_chip_ram_r(CUSTOM_REG_LONG(REG_BPL1PTH + p * 2)); CUSTOM_REG_LONG(REG_BPL1PTH + p * 2) += 2; } } pfpix1 |= assemble_odd_bitplanes(planes, obitoffs); obitoffs--; } else pfpix1 |= pfpix0 & 0x15; /* reset bit offsets if needed */ if (obitoffs < 0) obitoffs = 15; } /* 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 == 15) for (p = 1; p < planes; p += 2) { CUSTOM_REG(REG_BPL1DAT + p) = amiga_chip_ram_r(CUSTOM_REG_LONG(REG_BPL1PTH + p * 2)); CUSTOM_REG_LONG(REG_BPL1PTH + p * 2) += 2; } /* 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 = 15; for (p = 1; p < planes; p += 2) { CUSTOM_REG(REG_BPL1DAT + p) = amiga_chip_ram_r(CUSTOM_REG_LONG(REG_BPL1PTH + p * 2)); CUSTOM_REG_LONG(REG_BPL1PTH + p * 2) += 2; } } pfpix1 |= assemble_even_bitplanes(planes, ebitoffs); ebitoffs--; } else pfpix1 |= pfpix0 & 0x2a; /* reset bit offsets if needed */ if (ebitoffs < 0) ebitoffs = 15; } /* 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 (x >= hstart && x < hstop) { /* hold-and-modify mode -- assume low-res (hi-res not supported by the hardware) */ if (ham) { /* update the HAM color */ pfpix0 = update_ham(pfpix0); /* sprite has priority */ if (sprpix && pf1pri > (sprpix >> 10)) { dst[x*2+0] = dst[x*2+1] = CUSTOM_REG(REG_COLOR00 + (sprpix & 0x1f)); } /* playfield has priority */ else { dst[x*2+0] = dst[x*2+1] = pfpix0; } } /* dual playfield mode */ else if (dualpf) { int pix; /* mask out the sprite if it doesn't have priority */ pix = sprpix & 0x1f; if (pix) { if ((pfpix0 & 0x15) && pf1pri <= (sprpix >> 10)) pix = 0; if ((pfpix0 & 0x2a) && pf2pri <= (sprpix >> 10)) pix = 0; } /* write out the left pixel */ if (pix) dst[x*2+0] = CUSTOM_REG(REG_COLOR00 + pix); else dst[x*2+0] = CUSTOM_REG(REG_COLOR00 + 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 <= (sprpix >> 10)) pix = 0; if ((pfpix1 & 0x2a) && pf2pri <= (sprpix >> 10)) pix = 0; } /* write out the right pixel */ if (pix) dst[x*2+1] = CUSTOM_REG(REG_COLOR00 + pix); else dst[x*2+1] = CUSTOM_REG(REG_COLOR00 + separate_bitplanes[(CUSTOM_REG(REG_BPLCON2) >> 6) & 1][pfpix1]); } /* single playfield mode */ else { /* sprite has priority */ if (sprpix && pf1pri > (sprpix >> 10)) { dst[x*2+0] = dst[x*2+1] = CUSTOM_REG(REG_COLOR00 + (sprpix & 0x1f)); } /* playfield has priority */ else { dst[x*2+0] = CUSTOM_REG(REG_COLOR00 + pfpix0); dst[x*2+1] = CUSTOM_REG(REG_COLOR00 + pfpix1); } } } } } #if 0 if ( cpu_getcurrentframe() % 64 == 0 && scanline == 100 ) { const char *m_lores = "LORES"; const char *m_hires = "HIRES"; const char *m_ham = "HAM"; const char *m_dualpf = "DUALPF"; const char *m_lace = "LACE"; const char *m_hilace = "HI-LACE"; const char *p = m_lores; if ( hires ) p = m_hires; if ( ham ) p = m_ham; if ( dualpf ) p = m_dualpf; if ( lace ) p = m_lace; if ( hires && lace ) p = m_hilace; popmessage("%s(%d pl od=%04x ed=%04x start=%04x stop=%04x)", p, planes, odelay, edelay, CUSTOM_REG(REG_DDFSTRT), CUSTOM_REG(REG_DDFSTOP) ); } #endif /* end of the line: time to add the modulos */ if (scanline >= vstart && scanline < vstop) { int p; /* update odd planes */ for (p = 0; p < planes; p += 2) CUSTOM_REG_LONG(REG_BPL1PTH + p * 2) += CUSTOM_REG_SIGNED(REG_BPL1MOD); /* update even planes */ for (p = 1; p < planes; p += 2) CUSTOM_REG_LONG(REG_BPL1PTH + p * 2) += CUSTOM_REG_SIGNED(REG_BPL2MOD); } /* restore color00 */ CUSTOM_REG(REG_COLOR00) = save_color0; #if GUESS_COPPER_OFFSET if (cpu_getcurrentframe() % 64 == 0 && scanline == 0) { if (input_code_pressed(KEYCODE_Q)) popmessage("%d", wait_offset -= 1); if (input_code_pressed(KEYCODE_W)) popmessage("%d", wait_offset += 1); } #endif }