/*************************************************************************** Amiga AGA hardware Driver by: Ernesto Corvi, Mariusz Wojcieszek, Aaron Giles Done: - palette - bitplane data fetching - support for up to 8 standard bitplanes - HAM8 mode - preliminary sprites To do: - incorrect hstart/hstop values in CD32 logo, lsrquiz & lsrquiz2 - sprite collisions ***************************************************************************/ #include "emu.h" #include "includes/amiga.h" /************************************* * * Statics * *************************************/ /************************************* * * Palette * *************************************/ void amiga_aga_palette_write(running_machine &machine, int color_reg, UINT16 data) { amiga_state *state = machine.driver_data(); pen_t *aga_palette = state->m_aga_palette; int r,g,b; int cr,cg,cb; int color; color = ((CUSTOM_REG(REG_BPLCON3) >> 13) & 0x07)*32 + color_reg; r = (data & 0xf00) >> 8; g = (data & 0x0f0) >> 4; b = (data & 0x00f) >> 0; cr = RGB_RED(aga_palette[color]); cg = RGB_GREEN(aga_palette[color]); cb = RGB_BLUE(aga_palette[color]); if (BIT(CUSTOM_REG(REG_BPLCON3),9)) { // load low nibbles cr = (cr & 0xf0) | r; cg = (cg & 0xf0) | g; cb = (cb & 0xf0) | b; } else { cr = (r << 4) | r; cg = (g << 4) | g; cb = (b << 4) | b; } aga_palette[color] = MAKE_RGB(cr,cg,cb); } /************************************* * * Video startup * *************************************/ VIDEO_START( amiga_aga ) { amiga_state *state = machine.driver_data(); VIDEO_START_CALL( amiga ); state->m_aga_diwhigh_written = 0; } /************************************* * * Per-scanline sprite fetcher * *************************************/ INLINE void fetch_sprite_data(amiga_state *state, int scanline, int sprite) { switch((CUSTOM_REG(REG_FMODE) >> 2) & 0x03) { case 0: state->m_aga_sprdata[sprite][0] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 0); state->m_aga_sprdatb[sprite][0] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 2); CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) += 4; state->m_aga_sprite_fetched_words = 1; if (LOG_SPRITE_DMA) logerror("%3d:sprite %d fetch: data=%04X-%04X\n", scanline, sprite, state->m_aga_sprdata[sprite][0], state->m_aga_sprdatb[sprite][0]); break; case 1: case 2: state->m_aga_sprdata[sprite][0] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 0); state->m_aga_sprdata[sprite][1] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 2); CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) += 4; state->m_aga_sprdatb[sprite][0] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 0); state->m_aga_sprdatb[sprite][1] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 2); CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) += 4; state->m_aga_sprite_fetched_words = 2; if (LOG_SPRITE_DMA) logerror("%3d:sprite %d fetch: data=%04X-%04X %04X-%04X\n", scanline, sprite, state->m_aga_sprdata[sprite][0], state->m_aga_sprdatb[sprite][0], state->m_aga_sprdata[sprite][1], state->m_aga_sprdatb[sprite][1] ); break; case 3: state->m_aga_sprdata[sprite][0] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 0); state->m_aga_sprdata[sprite][1] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 2); CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) += 4; state->m_aga_sprdata[sprite][2] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 0); state->m_aga_sprdata[sprite][3] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 2); CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) += 4; state->m_aga_sprdatb[sprite][0] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 0); state->m_aga_sprdatb[sprite][1] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 2); CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) += 4; state->m_aga_sprdatb[sprite][2] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 0); state->m_aga_sprdatb[sprite][3] = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) + 2); CUSTOM_REG_LONG(REG_SPR0PTH + 2 * sprite) += 4; state->m_aga_sprite_fetched_words = 4; if (LOG_SPRITE_DMA) logerror("%3d:sprite %d fetch: data=%04X-%04X %04X-%04X %04X-%04X %04X-%04X\n", scanline, sprite, state->m_aga_sprdata[sprite][0], state->m_aga_sprdatb[sprite][0], state->m_aga_sprdata[sprite][1], state->m_aga_sprdatb[sprite][1], state->m_aga_sprdata[sprite][2], state->m_aga_sprdatb[sprite][2], state->m_aga_sprdata[sprite][3], state->m_aga_sprdatb[sprite][3]); break; } state->m_aga_sprite_dma_used_words[sprite] = 0; } static void update_sprite_dma(amiga_state *state, 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 && (state->m_sprite_dma_live_mask & bitmask) && (state->m_sprite_dma_reload_mask & bitmask) && !(state->m_sprite_ctl_written & bitmask)) { /* disable the sprite */ state->m_sprite_comparitor_enable_mask &= ~bitmask; state->m_sprite_dma_reload_mask &= ~bitmask; /* fetch data into the control words */ CUSTOM_REG(REG_SPR0POS + 4 * num) = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * num) + 0); CUSTOM_REG(REG_SPR0CTL + 4 * num) = (*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_SPR0PTH + 2 * num) + 2); CUSTOM_REG_LONG(REG_SPR0PTH + 2 * num) += 4; /* fetch additional words */ switch((CUSTOM_REG(REG_FMODE) >> 2) & 0x03) { case 0: break; case 1: case 2: CUSTOM_REG_LONG(REG_SPR0PTH + 2 * num) += 4; break; case 3: CUSTOM_REG_LONG(REG_SPR0PTH + 2 * num) += 3*4; break; } 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) { state->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) { state->m_sprite_ctl_written &= ~bitmask; state->m_sprite_comparitor_enable_mask &= ~bitmask; state->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 && (state->m_sprite_dma_live_mask & bitmask) && (state->m_sprite_comparitor_enable_mask & bitmask)) { fetch_sprite_data(state, scanline, num); } } } /************************************* * * Per-pixel sprite computations * *************************************/ INLINE UINT32 interleave_sprite_data(UINT16 lobits, UINT16 hibits) { return (amiga_expand_byte[lobits & 0xff] << 0) | (amiga_expand_byte[lobits >> 8] << 16) | (amiga_expand_byte[hibits & 0xff] << 1) | (amiga_expand_byte[hibits >> 8] << 17); } static int get_sprite_pixel(amiga_state *state, int x) { int pixels = 0; int num, pair; /* loop over sprite channels */ for (num = 0; num < 8; num++) if (state->m_sprite_comparitor_enable_mask & (1 << num)) { /* if we're not currently clocking, check against hstart */ if (state->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) { state->m_sprite_remain[num] = 16; state->m_sprite_shiftreg[num] = interleave_sprite_data(state->m_aga_sprdata[num][0], state->m_aga_sprdatb[num][0]); state->m_aga_sprite_dma_used_words[num] = 1; } } /* clock the next pixel if we're doing it */ if (state->m_sprite_remain[num] != 0) { state->m_sprite_remain[num]--; pixels |= (state->m_sprite_shiftreg[num] & 0xc0000000) >> (16 + 2 * (7 - num)); state->m_sprite_shiftreg[num] <<= 2; if (state->m_sprite_remain[num] == 0) { if (state->m_aga_sprite_dma_used_words[num] < state->m_aga_sprite_fetched_words) { int w = state->m_aga_sprite_dma_used_words[num]; state->m_sprite_remain[num] = 16; state->m_sprite_shiftreg[num] = interleave_sprite_data(state->m_aga_sprdata[num][w], state->m_aga_sprdatb[num][w]); state->m_aga_sprite_dma_used_words[num]++; } } } } /* 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; int esprm, osprm; esprm = CUSTOM_REG(REG_BPLCON4) & 0x00f0; osprm = (CUSTOM_REG(REG_BPLCON4) & 0x000f) << 4; /* 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 0-7 sprite present bitmask in bits 8-9 topmost sprite pair index in bits 12-13 */ UINT32 result = (collide << 8) | (pair << 12); /* 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 * *************************************/ INLINE UINT8 assemble_odd_bitplanes(amiga_state *state, int planes, int obitoffs) { UINT64 *aga_bpldat = state->m_aga_bpldat; UINT8 pix = (aga_bpldat[0] >> obitoffs) & 1; if (planes >= 3) { pix |= ((aga_bpldat[2] >> obitoffs) & 1) << 2; if (planes >= 5) { pix |= ((aga_bpldat[4] >> obitoffs) & 1) << 4; if (planes >= 7) pix |= ((aga_bpldat[6] >> obitoffs) & 1) << 6; } } return pix; } INLINE UINT8 assemble_even_bitplanes(amiga_state *state, int planes, int ebitoffs) { UINT8 pix = 0; if (planes >= 2) { UINT64 *aga_bpldat = state->m_aga_bpldat; pix |= ((aga_bpldat[1] >> ebitoffs) & 1) << 1; if (planes >= 4) { pix |= ((aga_bpldat[3] >> ebitoffs) & 1) << 3; if (planes >= 6) { pix |= ((aga_bpldat[5] >> ebitoffs) & 1) << 5; if (planes >= 8) pix |= ((aga_bpldat[7] >> ebitoffs) & 1) << 7; } } } return pix; } INLINE void fetch_bitplane_data(amiga_state *state, int plane) { UINT64 *aga_bpldat = state->m_aga_bpldat; switch (CUSTOM_REG(REG_FMODE) & 0x03) { case 0: aga_bpldat[plane] = (UINT64)(*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2)); CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2) += 2; break; case 1: case 2: aga_bpldat[plane] = (UINT64)(*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2)) << 16; CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2) += 2; aga_bpldat[plane] |= ((UINT64)(*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2))); CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2) += 2; break; case 3: aga_bpldat[plane] = (UINT64)(*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2)) << 48; CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2) += 2; aga_bpldat[plane] |= ((UINT64)(*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2))) << 32; CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2) += 2; aga_bpldat[plane] |= ((UINT64)(*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2))) << 16; CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2) += 2; aga_bpldat[plane] |= (UINT64)(*state->m_chip_ram_r)(state, CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2)); CUSTOM_REG_LONG(REG_BPL1PTH + plane * 2) += 2; break; } } void amiga_aga_diwhigh_written(running_machine &machine, int written) { amiga_state *state = machine.driver_data(); state->m_aga_diwhigh_written = written; } /************************************* * * Hold and modify pixel computations * *************************************/ INLINE int update_ham(amiga_state *state, int newpix) { switch (newpix & 0x03) { case 0: state->m_ham_color = state->m_aga_palette[(newpix >> 2) & 0x3f]; break; case 1: state->m_ham_color = MAKE_RGB(RGB_RED(state->m_ham_color), RGB_GREEN(state->m_ham_color), (newpix & 0xfc) | (RGB_BLUE(state->m_ham_color) & 0x03)); break; case 2: state->m_ham_color = MAKE_RGB((newpix & 0xfc) | (RGB_RED(state->m_ham_color) & 0x03), RGB_GREEN(state->m_ham_color), RGB_BLUE(state->m_ham_color)); break; case 3: state->m_ham_color = MAKE_RGB(RGB_RED(state->m_ham_color), (newpix & 0xfc) | (RGB_GREEN(state->m_ham_color) & 0x03), RGB_BLUE(state->m_ham_color)); break; } return state->m_ham_color; } /************************************* * * Single scanline rasterizer * *************************************/ void amiga_aga_render_scanline(running_machine &machine, bitmap_t *bitmap, int scanline) { amiga_state *state = machine.driver_data(); UINT16 save_color0 = CUSTOM_REG(REG_COLOR00); int ddf_start_pixel = 0, ddf_stop_pixel = 0; int hires = 0, dualpf = 0, ham = 0; int hstart = 0, hstop = 0; int vstart = 0, vstop = 0; int pf1pri = 0, pf2pri = 0; int planes = 0; int x; UINT32 *dst = NULL; int ebitoffs = 0, obitoffs = 0; int ecolmask = 0, ocolmask = 0; int edelay = 0, odelay = 0; int next_copper_x; int pl; int defbitoffs = 0; pen_t *aga_palette = state->m_aga_palette; state->m_last_scanline = scanline; /* on the first scanline, reset the COPPER and HAM color */ if (scanline == 0) { amiga_copper_setpc(machine, CUSTOM_REG_LONG(REG_COP1LCH)); state->m_ham_color = CUSTOM_REG(REG_COLOR00); } /* update sprite data fetching */ update_sprite_dma(state, scanline); /* start of a new line, signal we're not done with it and fill up vars */ if (bitmap != NULL) dst = BITMAP_ADDR32(bitmap, scanline, 0); /* all sprites off at the start of the line */ memset(state->m_sprite_remain, 0, sizeof(state->m_sprite_remain)); /* temporary set color 0 to the genlock color */ if (state->m_genlock_color != 0xffff) CUSTOM_REG(REG_COLOR00) = state->m_genlock_color; /* loop over the line */ next_copper_x = 2; /* copper runs on odd timeslots */ for (x = 0; x < 0xe8*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 = amiga_copper_execute_next(machine, x); save_color0 = CUSTOM_REG(REG_COLOR00); if (state->m_genlock_color != 0xffff) CUSTOM_REG(REG_COLOR00) = state->m_genlock_color; /* compute update-related register values */ planes = (CUSTOM_REG(REG_BPLCON0) & (BPLCON0_BPU0 | BPLCON0_BPU1 | BPLCON0_BPU2)) >> 12; if ( CUSTOM_REG(REG_BPLCON0) & BPLCON0_BPU3 ) planes |= 8; 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; /* get default bitoffset */ switch(CUSTOM_REG(REG_FMODE) & 0x3) { case 0: defbitoffs = 15; break; case 1: case 2: defbitoffs = 31; break; case 3: defbitoffs = 63; break; } /* 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 + defbitoffs - ((defbitoffs >= 31) ? 16 : 0)) : (17 + defbitoffs)); 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 = (CUSTOM_REG(REG_DIWSTOP) & 0xff); if (state->m_aga_diwhigh_written) { hstart |= ((CUSTOM_REG(REG_DIWHIGH) >> 5) & 1) << 8; hstop |= ((CUSTOM_REG(REG_DIWHIGH) >> 13) & 1) << 8; } else { hstop |= 0x100; } if ( hstop < hstart ) { hstart = 0x00; hstop = 0x1ff; } /* compute the vertical start/stop */ vstart = CUSTOM_REG(REG_DIWSTRT) >> 8; vstop = (CUSTOM_REG(REG_DIWSTOP) >> 8); if (state->m_aga_diwhigh_written) { vstart |= (CUSTOM_REG(REG_DIWHIGH) & 7) << 8; vstop |= ((CUSTOM_REG(REG_DIWHIGH) >> 8) & 7) << 8; } else { vstop |= ((~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 */ if (dst != NULL) dst[x*2+0] = dst[x*2+1] = aga_palette[0]; /* 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 < 8; pl++) state->m_aga_bpldat[pl] = 0; } /* need to run the sprite engine every pixel to ensure display */ sprpix = get_sprite_pixel(state, 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 == defbitoffs) { for (pl = 0; pl < planes; pl += 2) { fetch_bitplane_data(state, pl); } } /* now assemble the bits */ pfpix0 |= assemble_odd_bitplanes(state, 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(state, pl); } } pfpix1 |= assemble_odd_bitplanes(state, planes, obitoffs); obitoffs--; } else pfpix1 |= pfpix0 & 0x55; // 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(state, pl); } } /* now assemble the bits */ pfpix0 |= assemble_even_bitplanes(state, 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(state, pl); } } pfpix1 |= assemble_even_bitplanes(state, planes, ebitoffs); ebitoffs--; } else pfpix1 |= pfpix0 & 0xaa; /* 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 != NULL && x >= hstart && x < hstop) { 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(state, pfpix0); pix = sprpix & 0xff; pri = (sprpix >> 10); /* sprite has priority */ if (sprpix && pf1pri > pri) { dst[x*2+0] = dst[x*2+1] = aga_palette[pix]; } /* playfield has priority */ else { dst[x*2+0] = dst[x*2+1] = pfpix0; } } /* dual playfield mode */ else if (dualpf) { /* mask out the sprite if it doesn't have priority */ pix = sprpix & 0x1f; pri = (sprpix >> 12); 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] = aga_palette[pix]; else dst[x*2+0] = aga_palette[state->m_separate_bitplanes[(CUSTOM_REG(REG_BPLCON2) >> 6) & 1][pfpix0]]; /* mask out the sprite if it doesn't have priority */ pix = sprpix & 0xff; 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] = aga_palette[pix]; else dst[x*2+1] = aga_palette[state->m_separate_bitplanes[(CUSTOM_REG(REG_BPLCON2) >> 6) & 1][pfpix1]]; } /* single playfield mode */ else { pix = sprpix & 0xff; pri = (sprpix >> 12); /* sprite has priority */ if (sprpix && pf1pri > pri) { dst[x*2+0] = dst[x*2+1] = aga_palette[pix]; } /* playfield has priority */ else { dst[x*2+0] = aga_palette[pfpix0]; dst[x*2+1] = aga_palette[pfpix1]; } } } } } #if 0 if ( machine.primary_screen->frame_number() % 16 == 0 && scanline == 250 ) { 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=%02x ed=%02x start=%d stop=%d hstart=%04x hstop=%04x diwhigh=%04x fetchbits=%d )", p, planes, odelay, edelay, ddf_start_pixel, ddf_stop_pixel, CUSTOM_REG(REG_DIWSTRT), CUSTOM_REG(REG_DIWSTOP), CUSTOM_REG(REG_DIWHIGH), defbitoffs ); //popmessage("%s(%d pl bplpt1=%06X, bpl1mod=%04x, offset=%x)", p, planes, CUSTOM_REG_LONG(REG_BPL1PTH), CUSTOM_REG(REG_BPL1MOD), hires_modulo_offset ); } #endif /* end of the line: time to add the modulos */ if (scanline >= vstart && scanline < vstop) { /* 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; #if GUESS_COPPER_OFFSET if (machine.primary_screen->frame_number() % 64 == 0 && scanline == 0) { if (machine.input().code_pressed(KEYCODE_Q)) popmessage("%d", wait_offset -= 1); if (machine.input().code_pressed(KEYCODE_W)) popmessage("%d", wait_offset += 1); } #endif } /************************************* * * Update * *************************************/ SCREEN_UPDATE( amiga_aga ) { int y; /* render each scanline in the visible region */ for (y = cliprect->min_y; y <= cliprect->max_y; y++) amiga_aga_render_scanline(screen->machine(), bitmap, y); return 0; }