diff options
Diffstat (limited to 'src/mame/video/turbo.cpp')
-rw-r--r-- | src/mame/video/turbo.cpp | 657 |
1 files changed, 323 insertions, 334 deletions
diff --git a/src/mame/video/turbo.cpp b/src/mame/video/turbo.cpp index 723aa15054e..2cf22dd9d6c 100644 --- a/src/mame/video/turbo.cpp +++ b/src/mame/video/turbo.cpp @@ -27,11 +27,11 @@ static constexpr uint32_t sprite_expand[16] = * *************************************/ -void turbo_state::turbo_palette(palette_device &palette) const +void turbo_state::palette(palette_device &palette) const { static constexpr int resistances[3] = { 1000, 470, 220 }; - /* compute the color output resistor weights */ + // compute the color output resistor weights double rweights[3], gweights[3], bweights[2]; compute_resistor_weights(0, 255, -1.0, 3, &resistances[0], rweights, 470, 0, @@ -55,7 +55,7 @@ void turbo_state::turbo_palette(palette_device &palette) const } -void turbo_state::subroc3d_palette(palette_device &palette) const +void subroc3d_state::palette(palette_device &palette) const { static constexpr int resistances[3] = { 1000, 470, 220 }; @@ -83,7 +83,7 @@ void turbo_state::subroc3d_palette(palette_device &palette) const } -void turbo_state::buckrog_palette(palette_device &palette) const +void buckrog_state::palette(palette_device &palette) const { static constexpr int resistances[4] = { 2200, 1000, 500, 250 }; @@ -118,39 +118,35 @@ void turbo_state::buckrog_palette(palette_device &palette) const * *************************************/ -TILE_GET_INFO_MEMBER(turbo_state::get_fg_tile_info) +TILE_GET_INFO_MEMBER(turbo_base_state::get_fg_tile_info) { int code = m_videoram[tile_index]; tileinfo.set(0, code, code >> 2, 0); } -VIDEO_START_MEMBER(turbo_state,turbo) -{ - /* initialize the foreground tilemap */ - m_fg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(turbo_state::get_fg_tile_info)), TILEMAP_SCAN_ROWS, 8,8, 32,32); -} - - -VIDEO_START_MEMBER(turbo_state,buckrog) +void turbo_base_state::video_start() { - /* initialize the foreground tilemap */ - m_fg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(turbo_state::get_fg_tile_info)), TILEMAP_SCAN_ROWS, 8,8, 32,32); - - /* allocate the bitmap RAM */ - m_buckrog_bitmap_ram = std::make_unique<uint8_t[]>(0xe000); - save_pointer(NAME(m_buckrog_bitmap_ram), 0xe000); + // initialize the foreground tilemap + m_fg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(turbo_base_state::get_fg_tile_info)), TILEMAP_SCAN_ROWS, 8,8, 32,32); + + save_item(NAME(m_sprite_info.ve)); + save_item(NAME(m_sprite_info.lst)); + save_item(NAME(m_sprite_info.latched)); + save_item(NAME(m_sprite_info.plb)); + save_item(NAME(m_sprite_info.offset)); + save_item(NAME(m_sprite_info.frac)); + save_item(NAME(m_sprite_info.step)); } - /************************************* * * Videoram access * *************************************/ -void turbo_state::turbo_videoram_w(offs_t offset, uint8_t data) +void turbo_base_state::videoram_w(offs_t offset, uint8_t data) { m_videoram[offset] = data; if (offset < 0x400) @@ -161,9 +157,9 @@ void turbo_state::turbo_videoram_w(offs_t offset, uint8_t data) } -void turbo_state::buckrog_bitmap_w(offs_t offset, uint8_t data) +void buckrog_state::bitmap_w(offs_t offset, uint8_t data) { - m_buckrog_bitmap_ram[offset] = data & 1; + m_bitmap_ram[offset] = data & 1; } @@ -174,22 +170,22 @@ void turbo_state::buckrog_bitmap_w(offs_t offset, uint8_t data) * *************************************/ -inline uint32_t turbo_state::sprite_xscale(uint8_t dacinput, double vr1, double vr2, double cext) +inline uint32_t turbo_base_state::sprite_xscale(uint8_t dacinput, double vr1, double vr2, double cext) { - /* compute the effective pixel clock for this sprite */ - /* thanks to Frank Palazzolo for figuring out this logic */ + // compute the effective pixel clock for this sprite + // thanks to Frank Palazzolo for figuring out this logic - /* compute the control voltage to the VCO */ - /* VR1 and VR2 are variable resistors on Turbo, fixed on other boards */ + // compute the control voltage to the VCO + // VR1 and VR2 are variable resistors on Turbo, fixed on other boards double iref = 5.0 / (1.5e3 + vr2); double iout = iref * ((double)dacinput / 256.0); double vref = 5.0 * 1e3 / (3.8e3 + 1e3 + vr1); double vco_cv = (2.2e3 * iout) + vref; - /* based on the control voltage, compute the frequency assuming a 50pF */ - /* external capacitor; this is the graph in the datasheet. Some attempt */ - /* to simulate the non-linearity at the edges has been made, but it is */ - /* admittedly cheesy. */ + // based on the control voltage, compute the frequency assuming a 50pF + // external capacitor; this is the graph in the datasheet. Some attempt + // to simulate the non-linearity at the edges has been made, but it is + // admittedly cheesy. double vco_freq; if (vco_cv > 5.0) vco_cv = 5.0; @@ -204,20 +200,20 @@ inline uint32_t turbo_state::sprite_xscale(uint8_t dacinput, double vr1, double else vco_freq = (-1.560279 + pow(vco_cv - 4.3 + 6, 1.26)) * 1e6; - /* now scale based on the actual external capacitor; the frequency goes */ - /* up by a factor of 10 for every factor of 10 the capacitance is reduced */ - /* approximately */ + // now scale based on the actual external capacitor; the frequency goes + // up by a factor of 10 for every factor of 10 the capacitance is reduced + // approximately vco_freq *= 50e-12 / cext; } else { - /* based on figure 6 of datasheet */ + // based on figure 6 of datasheet vco_freq = -0.9892942 * log10(cext) - 0.0309697 * vco_cv * vco_cv + 0.344079975 * vco_cv - 4.086395841; vco_freq = pow(10.0, vco_freq); } - /* finally, convert to a fraction (8.24) of 5MHz, which is the pixel clock */ + // finally, convert to a fraction (8.24) of 5MHz, which is the pixel clock return (uint32_t)((vco_freq / (5e6 * TURBO_X_SCALE)) * 16777216.0); } @@ -229,31 +225,30 @@ inline uint32_t turbo_state::sprite_xscale(uint8_t dacinput, double vr1, double * *************************************/ -void turbo_state::turbo_prepare_sprites(uint8_t y, sprite_info *info) +void turbo_state::prepare_sprites(uint8_t y) { const uint8_t *pr1119 = &m_proms[0x200]; - int sprnum; - /* initialize the line enable signals to 0 */ - info->ve = 0; - info->lst = 0; + // initialize the line enable signals to 0 + m_sprite_info.ve = 0; + m_sprite_info.lst = 0; - /* compute the sprite information, which was done on the previous scanline during HBLANK */ - for (sprnum = 0; sprnum < 16; sprnum++) + // compute the sprite information, which was done on the previous scanline during HBLANK + for (int sprnum = 0; sprnum < 16; sprnum++) { uint8_t *rambase = &m_alt_spriteram[sprnum * 8]; int level = sprnum & 7; uint8_t clo, chi; uint32_t sum; - /* perform the first ALU to see if we are within the scanline */ + // perform the first ALU to see if we are within the scanline sum = y + (rambase[0] ^ 0xff); clo = (sum >> 8) & 1; sum += (y << 8) + ((rambase[1] ^ 0xff) << 8); chi = (sum >> 16) & 1; - /* the AND of the low carry and the inverse of the high carry clocks an enable bit */ - /* for this sprite; note that the logic in the Turbo schematics is reversed here */ + // the AND of the low carry and the inverse of the high carry clocks an enable bit + // for this sprite; note that the logic in the Turbo schematics is reversed here if (clo & (chi ^ 1)) { int xscale = rambase[2] ^ 0xff; @@ -261,16 +256,16 @@ void turbo_state::turbo_prepare_sprites(uint8_t y, sprite_info *info) uint16_t offset = rambase[6] + (rambase[7] << 8); int offs; - /* mark this entry enabled */ - info->ve |= 1 << sprnum; + // mark this entry enabled + m_sprite_info.ve |= 1 << sprnum; - /* look up the low byte of the sum plus the yscale value in */ - /* IC50/PR1119 to determine if we write back the sum of the */ - /* offset and the rowbytes this scanline (p. 138) */ - offs = (sum & 0xff) | /* A0-A7 = AL0-AL7 */ - ((yscale & 0x08) << 5); /* A8-A9 = /RO11-/RO12 */ + // look up the low byte of the sum plus the yscale value in + // IC50/PR1119 to determine if we write back the sum of the + // offset and the rowbytes this scanline (p. 138) + offs = (sum & 0xff) | // A0-A7 = AL0-AL7 + ((yscale & 0x08) << 5); // A8-A9 = /RO11-/RO12 - /* one of the bits is selected based on the low 7 bits of yscale */ + // one of the bits is selected based on the low 7 bits of yscale if (!((pr1119[offs] >> (yscale & 0x07)) & 1)) { offset += rambase[4] + (rambase[5] << 8); @@ -278,63 +273,62 @@ void turbo_state::turbo_prepare_sprites(uint8_t y, sprite_info *info) rambase[7] = offset >> 8; } - /* the output of the ALU here goes to the individual level counter */ - info->latched[level] = 0; - info->plb[level] = 0; - info->offset[level] = offset; - info->frac[level] = 0; + // the output of the ALU here goes to the individual level counter + m_sprite_info.latched[level] = 0; + m_sprite_info.plb[level] = 0; + m_sprite_info.offset[level] = offset; + m_sprite_info.frac[level] = 0; /* actual pots read from one board: VR1 = 310 Ohm VR2 = 910 Ohm */ - info->step[level] = sprite_xscale(xscale, 1.0e3 * ioport("VR1")->read() / 100.0, 1.0e3 * ioport("VR2")->read() / 100.0, 100e-12); + m_sprite_info.step[level] = sprite_xscale(xscale, 1.0e3 * m_vr[0]->read() / 100.0, 1.0e3 * m_vr[1]->read() / 100.0, 100e-12); } } } -uint32_t turbo_state::turbo_get_sprite_bits(uint8_t road, sprite_info *sprinfo) +uint32_t turbo_state::get_sprite_bits(uint8_t road) { - uint8_t sprlive = sprinfo->lst; + uint8_t sprlive = m_sprite_info.lst; uint32_t sprdata = 0; - int level; - /* if we haven't left the road yet, sprites 3-7 are disabled */ + // if we haven't left the road yet, sprites 3-7 are disabled if (!road) sprlive &= 0x07; - /* loop over all live levels */ - for (level = 0; level < 8; level++) + // loop over all live levels + for (int level = 0; level < 8; level++) if (sprlive & (1 << level)) { - /* latch the data and advance the offset */ - sprdata |= sprinfo->latched[level]; - sprinfo->frac[level] += sprinfo->step[level]; + // latch the data and advance the offset + sprdata |= m_sprite_info.latched[level]; + m_sprite_info.frac[level] += m_sprite_info.step[level]; - /* if we're live and we've clocked more data, advance */ - while (sprinfo->frac[level] >= 0x1000000) + // if we're live and we've clocked more data, advance + while (m_sprite_info.frac[level] >= 0x1000000) { - uint16_t offs = sprinfo->offset[level]; + uint16_t offs = m_sprite_info.offset[level]; uint8_t pixdata; - /* bit 0 controls which half of the byte to use */ - /* bits 1-13 go to address lines */ - /* bit 14 selects which of the two ROMs to read from */ + // bit 0 controls which half of the byte to use + // bits 1-13 go to address lines + // bit 14 selects which of the two ROMs to read from pixdata = m_spriteroms[(level << 14) | ((offs >> 1) & 0x3fff)] >> ((~offs & 1) * 4); - sprinfo->latched[level] = sprite_expand[pixdata & 0x0f] << level; + m_sprite_info.latched[level] = sprite_expand[pixdata & 0x0f] << level; - /* if bit 3 is 0 and bit 2 is 1, the enable flip/flip is reset */ + // if bit 3 is 0 and bit 2 is 1, the enable flip/flip is reset if ((pixdata & 0x0c) == 0x04) { - sprinfo->lst &= ~(1 << level); + m_sprite_info.lst &= ~(1 << level); sprlive &= ~(1 << level); } - /* if bit 15 is set, we decrement instead of increment */ - sprinfo->offset[level] += (offs & 0x8000) ? -1 : 1; - sprinfo->frac[level] -= 0x1000000; + // if bit 15 is set, we decrement instead of increment + m_sprite_info.offset[level] += (offs & 0x8000) ? -1 : 1; + m_sprite_info.frac[level] -= 0x1000000; } } @@ -349,7 +343,7 @@ uint32_t turbo_state::turbo_get_sprite_bits(uint8_t road, sprite_info *sprinfo) * *************************************/ -uint32_t turbo_state::screen_update_turbo(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) +uint32_t turbo_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { bitmap_ind16 &fgpixmap = m_fg_tilemap->pixmap(); uint8_t const *const pr1114 = &m_proms[0x000]; @@ -361,57 +355,56 @@ uint32_t turbo_state::screen_update_turbo(screen_device &screen, bitmap_ind16 &b uint8_t const *const pr1122 = &m_proms[0x800]; uint8_t const *const pr1123 = &m_proms[0xc00]; - /* loop over rows */ + // loop over rows for (int y = cliprect.min_y; y <= cliprect.max_y; y++) { uint16_t const *const fore = &fgpixmap.pix(y); uint16_t *const dest = &bitmap.pix(y); int road = 0; - sprite_info sprinfo; - /* compute the Y sum between opa and the current scanline (p. 141) */ - int va = (y + m_turbo_opa) & 0xff; + // compute the Y sum between opa and the current scanline (p. 141) + int va = (y + m_opa) & 0xff; - /* the upper bit of OPC inverts the road (p. 141) */ - if (!(m_turbo_opc & 0x80)) + // the upper bit of OPC inverts the road (p. 141) + if (!(m_opc & 0x80)) va ^= 0xff; - /* compute the sprite information; we use y-1 since this info was computed during HBLANK */ - /* on the previous scanline */ - turbo_prepare_sprites(y, &sprinfo); + // compute the sprite information; we use y-1 since this info was computed during HBLANK + // on the previous scanline + prepare_sprites(y); - /* loop over columns */ + // loop over columns for (int x = 0; x <= cliprect.max_x; x += TURBO_X_SCALE) { int xx = x / TURBO_X_SCALE; - /* load the bitmask from the sprite position for both halves of the sprites (p. 139) */ + // load the bitmask from the sprite position for both halves of the sprites (p. 139) uint16_t he = m_sprite_position[xx] | (m_sprite_position[xx + 0x100] << 8); - /* the AND of the line enable and horizontal enable is clocked and held in LST0-7 (p. 143) */ - he &= sprinfo.ve; - sprinfo.lst |= he | (he >> 8); + // the AND of the line enable and horizontal enable is clocked and held in LST0-7 (p. 143) + he &= m_sprite_info.ve; + m_sprite_info.lst |= he | (he >> 8); - /* compute the X sum between opb and the current column; only the carry matters (p. 141) */ - uint8_t carry = (xx + m_turbo_opb) >> 8; + // compute the X sum between opb and the current column; only the carry matters (p. 141) + uint8_t carry = (xx + m_opb) >> 8; - /* the carry selects which inputs to use (p. 141) */ + // the carry selects which inputs to use (p. 141) int sel, coch; if (carry) { - sel = m_turbo_ipb; - coch = m_turbo_ipc >> 4; + sel = m_ipb; + coch = m_ipc >> 4; } else { - sel = m_turbo_ipa; - coch = m_turbo_ipc & 15; + sel = m_ipa; + coch = m_ipc & 15; } - /* look up AREA1 and AREA2 (p. 142) */ + // look up AREA1 and AREA2 (p. 142) int area, offs, areatmp; - offs = va | /* A0- A7 = VA0-VA7 */ - ((sel & 0x0f) << 8); /* A8-A11 = SEL0-3 */ + offs = va | // A0- A7 = VA0-VA7 + ((sel & 0x0f) << 8); // A8-A11 = SEL0-3 areatmp = m_roadroms[0x0000 | offs]; areatmp = ((areatmp + xx) >> 8) & 0x01; @@ -421,9 +414,9 @@ uint32_t turbo_state::screen_update_turbo(screen_device &screen, bitmap_ind16 &b areatmp = ((areatmp + xx) >> 8) & 0x01; area |= areatmp << 1; - /* look up AREA3 and AREA4 (p. 142) */ - offs = va | /* A0- A7 = VA0-VA7 */ - ((sel & 0xf0) << 4); /* A8-A11 = SEL4-7 */ + // look up AREA3 and AREA4 (p. 142) + offs = va | // A0- A7 = VA0-VA7 + ((sel & 0xf0) << 4); // A8-A11 = SEL4-7 areatmp = m_roadroms[0x2000 | offs]; areatmp = ((areatmp + xx) >> 8) & 0x01; @@ -433,90 +426,90 @@ uint32_t turbo_state::screen_update_turbo(screen_device &screen, bitmap_ind16 &b areatmp = ((areatmp + xx) >> 8) & 0x01; area |= areatmp << 3; - /* look up AREA5 (p. 141) */ - offs = (xx >> 3) | /* A0- A4 = H3-H7 */ - ((m_turbo_opc & 0x3f) << 5); /* A5-A10 = OPC0-5 */ + // look up AREA5 (p. 141) + offs = (xx >> 3) | // A0- A4 = H3-H7 + ((m_opc & 0x3f) << 5); // A5-A10 = OPC0-5 areatmp = m_roadroms[0x4000 | offs]; areatmp = (areatmp << (xx & 7)) & 0x80; area |= areatmp >> 3; - /* compute the final area value and look it up in IC18/PR1115 (p. 144) */ - /* note: SLIPAR is 0 on the road surface only */ - /* ACCIAR is 0 on the road surface and the striped edges only */ + // compute the final area value and look it up in IC18/PR1115 (p. 144) + // note: SLIPAR is 0 on the road surface only + // ACCIAR is 0 on the road surface and the striped edges only int babit = pr1115[area]; int slipar_acciar = babit & 0x30; if (!road && (slipar_acciar & 0x20)) road = 1; - /* also use the coch value to look up color info in IC13/PR1114 and IC21/PR1117 (p. 144) */ - offs = (coch & 0x0f) | /* A0-A3: CONT0-3 = COCH0-3 */ - ((m_turbo_fbcol & 0x01) << 4); /* A4: COL0 */ + // also use the coch value to look up color info in IC13/PR1114 and IC21/PR1117 (p. 144) + offs = (coch & 0x0f) | // A0-A3: CONT0-3 = COCH0-3 + ((m_fbcol & 0x01) << 4); // A4: COL0 int bacol = pr1114[offs] | (pr1117[offs] << 8); - /* at this point, do the character lookup; due to the shift register loading in */ - /* the sync PROM, we latch character 0 during pixel 6 and start clocking in pixel */ - /* 8, effectively shifting the display by 8; at pixel 0x108, the color latch is */ - /* forced clear and isn't touched until the next shift register load */ + // at this point, do the character lookup; due to the shift register loading in + // the sync PROM, we latch character 0 during pixel 6 and start clocking in pixel + // 8, effectively shifting the display by 8; at pixel 0x108, the color latch is + // forced clear and isn't touched until the next shift register load int foreraw = (xx < 8 || xx >= 0x108) ? 0 : fore[xx - 8]; - /* perform the foreground color table lookup in IC99/PR1118 (p. 137) */ + // perform the foreground color table lookup in IC99/PR1118 (p. 137) int forebits = pr1118[foreraw]; - /* now that we have done all the per-5MHz pixel work, mix the sprites at the scale factor */ + // now that we have done all the per-5MHz pixel work, mix the sprites at the scale factor for (int ix = 0; ix < TURBO_X_SCALE; ix++) { - /* iterate over live sprites and update them */ - /* the final 32-bit value is: */ - /* CDB0-7 = D0 -D7 */ - /* CDG0-7 = D8 -D15 */ - /* CDR0-7 = D16-D23 */ - /* PLB0-7 = D24-D31 */ - uint32_t sprbits = turbo_get_sprite_bits(road, &sprinfo); - - /* perform collision detection here via lookup in IC20/PR1116 (p. 144) */ - m_turbo_collision |= pr1116[((sprbits >> 24) & 7) | (slipar_acciar >> 1)]; - - /* look up the sprite priority in IC11/PR1122 (p. 144) */ - int priority = ((sprbits & 0xfe000000) >> 25) | /* A0-A6: PLB1-7 */ - ((m_turbo_fbpla & 0x07) << 7); /* A7-A9: PLA0-2 */ + // iterate over live sprites and update them + // the final 32-bit value is: + // CDB0-7 = D0 -D7 + // CDG0-7 = D8 -D15 + // CDR0-7 = D16-D23 + // PLB0-7 = D24-D31 + uint32_t sprbits = get_sprite_bits(road); + + // perform collision detection here via lookup in IC20/PR1116 (p. 144) + m_collision |= pr1116[((sprbits >> 24) & 7) | (slipar_acciar >> 1)]; + + // look up the sprite priority in IC11/PR1122 (p. 144) + int priority = ((sprbits & 0xfe000000) >> 25) | // A0-A6: PLB1-7 + ((m_fbpla & 0x07) << 7); // A7-A9: PLA0-2 priority = pr1122[priority]; - /* use that to look up the overall priority in IC12/PR1123 (p. 144) */ - int mx = (priority & 7) | /* A0-A2: PR-1122 output, bits 0-2 */ - ((sprbits & 0x01000000) >> 21) | /* A3: PLB0 */ - ((foreraw & 0x80) >> 3) | /* A4: PLBE */ - ((forebits & 0x08) << 2) | /* A5: PLBF */ - ((babit & 0x07) << 6) | /* A6-A8: BABIT1-3 */ - ((m_turbo_fbpla & 0x08) << 6); /* A9: PLA3 */ + // use that to look up the overall priority in IC12/PR1123 (p. 144) + int mx = (priority & 7) | // A0-A2: PR-1122 output, bits 0-2 + ((sprbits & 0x01000000) >> 21) | // A3: PLB0 + ((foreraw & 0x80) >> 3) | // A4: PLBE + ((forebits & 0x08) << 2) | // A5: PLBF + ((babit & 0x07) << 6) | // A6-A8: BABIT1-3 + ((m_fbpla & 0x08) << 6); // A9: PLA3 mx = pr1123[mx]; - /* the MX output selects one of 16 inputs; build up a 16-bit pattern to match */ - /* these in red, green, and blue (p. 144) */ - int red = ((sprbits & 0x0000ff) >> 0) | /* D0- D7: CDR0-CDR7 */ - ((forebits & 0x01) << 8) | /* D8: CDRF */ - ((bacol & 0x001f) << 9) | /* D9-D13: BAR0-BAR4 */ - (1 << 14) | /* D14: 1 */ - (0 << 15); /* D15: 0 */ - - int grn = ((sprbits & 0x00ff00) >> 8) | /* D0- D7: CDG0-CDG7 */ - ((forebits & 0x02) << 7) | /* D8: CDGF */ - ((bacol & 0x03e0) << 4) | /* D9-D13: BAG0-BAG4 */ - (1 << 14) | /* D14: 1 */ - (0 << 15); /* D15: 0 */ - - int blu = ((sprbits & 0xff0000) >> 16) | /* D0- D7: CDB0-CDB7 */ - ((forebits & 0x04) << 6) | /* D8: CDBF */ - ((bacol & 0x7c00) >> 1) | /* D9-D13: BAB0-BAB4 */ - (1 << 14) | /* D14: 1 */ - (0 << 15); /* D15: 0 */ - - /* we then go through a muxer to select one of the 16 outputs computed above (p. 144) */ - offs = mx | /* A0-A3: MX0-MX3 */ - (((~red >> mx) & 1) << 4) | /* A4: CDR */ - (((~grn >> mx) & 1) << 5) | /* A5: CDG */ - (((~blu >> mx) & 1) << 6) | /* A6: CDB */ - ((m_turbo_fbcol & 6) << 6); /* A7-A8: COL1-2 */ + // the MX output selects one of 16 inputs; build up a 16-bit pattern to match + // these in red, green, and blue (p. 144) + int red = ((sprbits & 0x0000ff) >> 0) | // D0- D7: CDR0-CDR7 + ((forebits & 0x01) << 8) | // D8: CDRF + ((bacol & 0x001f) << 9) | // D9-D13: BAR0-BAR4 + (1 << 14) | // D14: 1 + (0 << 15); // D15: 0 + + int grn = ((sprbits & 0x00ff00) >> 8) | // D0- D7: CDG0-CDG7 + ((forebits & 0x02) << 7) | // D8: CDGF + ((bacol & 0x03e0) << 4) | // D9-D13: BAG0-BAG4 + (1 << 14) | // D14: 1 + (0 << 15); // D15: 0 + + int blu = ((sprbits & 0xff0000) >> 16) | // D0- D7: CDB0-CDB7 + ((forebits & 0x04) << 6) | // D8: CDBF + ((bacol & 0x7c00) >> 1) | // D9-D13: BAB0-BAB4 + (1 << 14) | // D14: 1 + (0 << 15); // D15: 0 + + // we then go through a muxer to select one of the 16 outputs computed above (p. 144) + offs = mx | // A0-A3: MX0-MX3 + (((~red >> mx) & 1) << 4) | // A4: CDR + (((~grn >> mx) & 1) << 5) | // A5: CDG + (((~blu >> mx) & 1) << 6) | // A6: CDB + ((m_fbcol & 6) << 6); // A7-A8: COL1-2 dest[x + ix] = pr1121[offs]; } } @@ -581,31 +574,30 @@ uint32_t turbo_state::screen_update_turbo(screen_device &screen, bitmap_ind16 &b */ -void turbo_state::subroc3d_prepare_sprites(uint8_t y, sprite_info *info) +void subroc3d_state::prepare_sprites(uint8_t y) { const uint8_t *pr1449 = &m_proms[0x300]; - int sprnum; - /* initialize the line enable signals to 0 */ - info->ve = 0; - info->lst = 0; + // initialize the line enable signals to 0 + m_sprite_info.ve = 0; + m_sprite_info.lst = 0; - /* compute the sprite information, which was done on the previous scanline during HBLANK */ - for (sprnum = 0; sprnum < 16; sprnum++) + // compute the sprite information, which was done on the previous scanline during HBLANK + for (int sprnum = 0; sprnum < 16; sprnum++) { uint8_t *rambase = &m_spriteram[sprnum * 8]; int level = sprnum & 7; uint8_t clo, chi; uint32_t sum; - /* perform the first ALU to see if we are within the scanline */ + // perform the first ALU to see if we are within the scanline sum = y + (rambase[0]/* ^ 0xff*/); clo = (sum >> 8) & 1; sum += (y << 8) + ((rambase[1]/* ^ 0xff*/) << 8); chi = (sum >> 16) & 1; - /* the AND of the low carry and the inverse of the high carry clocks an enable bit */ - /* for this sprite; note that the logic in the Turbo schematics is reversed here */ + // the AND of the low carry and the inverse of the high carry clocks an enable bit + // for this sprite; note that the logic in the Turbo schematics is reversed here if (clo & (chi ^ 1)) { int xscale = rambase[2] ^ 0xff; @@ -613,16 +605,16 @@ void turbo_state::subroc3d_prepare_sprites(uint8_t y, sprite_info *info) uint16_t offset = rambase[6] + (rambase[7] << 8); int offs; - /* mark this entry enabled */ - info->ve |= 1 << sprnum; + // mark this entry enabled + m_sprite_info.ve |= 1 << sprnum; - /* look up the low byte of the sum plus the yscale value in */ - /* IC50/PR1119 to determine if we write back the sum of the */ - /* offset and the rowbytes this scanline (p. 138) */ - offs = (sum & 0xff) | /* A0-A7 = AL0-AL7 */ - ((yscale & 0x08) << 5); /* A8-A9 = /RO11-/RO12 */ + // look up the low byte of the sum plus the yscale value in + // IC50/PR1119 to determine if we write back the sum of the */ + // offset and the rowbytes this scanline (p. 138) + offs = (sum & 0xff) | // A0-A7 = AL0-AL7 + ((yscale & 0x08) << 5); // A8-A9 = /RO11-/RO12 - /* one of the bits is selected based on the low 7 bits of yscale */ + // one of the bits is selected based on the low 7 bits of yscale if (!((pr1449[offs] >> (yscale & 0x07)) & 1)) { offset += rambase[4] + (rambase[5] << 8); @@ -630,18 +622,18 @@ void turbo_state::subroc3d_prepare_sprites(uint8_t y, sprite_info *info) rambase[7] = offset >> 8; } - /* the output of the ALU here goes to the individual level counter */ - info->latched[level] = 0; - info->plb[level] = 0; - info->offset[level] = offset << 1; - info->frac[level] = 0; - info->step[level] = sprite_xscale(xscale, 1.2e3, 1.2e3, 220e-12); + // the output of the ALU here goes to the individual level counter + m_sprite_info.latched[level] = 0; + m_sprite_info.plb[level] = 0; + m_sprite_info.offset[level] = offset << 1; + m_sprite_info.frac[level] = 0; + m_sprite_info.step[level] = sprite_xscale(xscale, 1.2e3, 1.2e3, 220e-12); } } } -uint32_t turbo_state::subroc3d_get_sprite_bits(sprite_info *sprinfo, uint8_t *plb) +uint32_t subroc3d_state::get_sprite_bits(uint8_t *plb) { /* see logic on each sprite: END = (CDA == 1 && (CDA ^ CDB) == 0 && (CDC ^ CDD) == 0) @@ -650,39 +642,38 @@ uint32_t turbo_state::subroc3d_get_sprite_bits(sprite_info *sprinfo, uint8_t *pl */ static const uint8_t plb_end[16] = { 0,1,1,2, 1,1,1,1, 1,1,1,1, 0,1,1,2 }; uint32_t sprdata = 0; - int level; *plb = 0; - /* loop over all live levels */ - for (level = 0; level < 8; level++) - if (sprinfo->lst & (1 << level)) + // loop over all live levels + for (int level = 0; level < 8; level++) + if (m_sprite_info.lst & (1 << level)) { - /* latch the data and advance the offset */ - sprdata |= sprinfo->latched[level]; - *plb |= sprinfo->plb[level]; - sprinfo->frac[level] += sprinfo->step[level]; + // latch the data and advance the offset + sprdata |= m_sprite_info.latched[level]; + *plb |= m_sprite_info.plb[level]; + m_sprite_info.frac[level] += m_sprite_info.step[level]; - /* if we're live and we've clocked more data, advance */ - while (sprinfo->frac[level] >= 0x800000) + // if we're live and we've clocked more data, advance + while (m_sprite_info.frac[level] >= 0x800000) { - uint32_t offs = sprinfo->offset[level]; + uint32_t offs = m_sprite_info.offset[level]; uint8_t pixdata; - /* bit 0 controls which half of the byte to use */ - /* bits 1-13 go to address lines */ - /* bit 14 selects which of the two ROMs to read from */ + // bit 0 controls which half of the byte to use + // bits 1-13 go to address lines + // bit 14 selects which of the two ROMs to read from pixdata = m_spriteroms[(level << 15) | ((offs >> 1) & 0x7fff)] >> ((~offs & 1) * 4); - sprinfo->latched[level] = sprite_expand[pixdata & 0x0f] << level; - sprinfo->plb[level] = (plb_end[pixdata & 0x0f] & 1) << level; + m_sprite_info.latched[level] = sprite_expand[pixdata & 0x0f] << level; + m_sprite_info.plb[level] = (plb_end[pixdata & 0x0f] & 1) << level; - /* if bit 3 is 0 and bit 2 is 1, the enable flip/flip is reset */ + // if bit 3 is 0 and bit 2 is 1, the enable flip/flip is reset if (plb_end[pixdata & 0x0f] & 2) - sprinfo->lst &= ~(1 << level); + m_sprite_info.lst &= ~(1 << level); - /* if bit 15 is set, we decrement instead of increment */ - sprinfo->offset[level] += (offs & 0x10000) ? -1 : 1; - sprinfo->frac[level] -= 0x800000; + // if bit 15 is set, we decrement instead of increment + m_sprite_info.offset[level] += (offs & 0x10000) ? -1 : 1; + m_sprite_info.frac[level] -= 0x800000; } } @@ -697,7 +688,7 @@ uint32_t turbo_state::subroc3d_get_sprite_bits(sprite_info *sprinfo, uint8_t *pl * *************************************/ -uint32_t turbo_state::screen_update_subroc3d(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) +uint32_t subroc3d_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { bitmap_ind16 &fgpixmap = m_fg_tilemap->pixmap(); uint8_t const *const pr1419 = &m_proms[0x000]; @@ -705,84 +696,83 @@ uint32_t turbo_state::screen_update_subroc3d(screen_device &screen, bitmap_ind16 uint8_t const *const pr1450 = &m_proms[0x500]; uint8_t const *const pr1454 = &m_proms[0x920]; - /* loop over rows */ + // loop over rows for (int y = cliprect.min_y; y <= cliprect.max_y; y++) { uint16_t const *const fore = &fgpixmap.pix(y); uint16_t *const dest = &bitmap.pix(y); - sprite_info sprinfo; - /* compute the sprite information; we use y-1 since this info was computed during HBLANK */ - /* on the previous scanline */ - subroc3d_prepare_sprites(y, &sprinfo); + // compute the sprite information; we use y-1 since this info was computed during HBLANK + // on the previous scanline + prepare_sprites(y); - /* loop over columns */ + // loop over columns for (int x = 0; x <= cliprect.max_x; x += TURBO_X_SCALE) { uint8_t xx = x / TURBO_X_SCALE; - /* load the bitmask from the sprite position for both halves of the sprites (p. 143) */ + // load the bitmask from the sprite position for both halves of the sprites (p. 143) uint16_t he = m_sprite_position[xx * 2] | (m_sprite_position[xx * 2 + 1] << 8); - /* the AND of the line enable and horizontal enable is clocked and held in LST0-7 (p. 143) */ - he &= sprinfo.ve; - sprinfo.lst |= he | (he >> 8); + // the AND of the line enable and horizontal enable is clocked and held in LST0-7 (p. 143) + he &= m_sprite_info.ve; + m_sprite_info.lst |= he | (he >> 8); - /* at this point, do the character lookup */ + // at this point, do the character lookup uint8_t foreraw; - if (!m_subroc3d_flip) + if (!m_flip) foreraw = fore[xx]; else foreraw = fore[(pr1454[(xx >> 3) & 0x1f] << 3) | (xx & 0x07)]; - /* perform the foreground color table lookup in IC62/PR1620 (p. 141) */ + // perform the foreground color table lookup in IC62/PR1620 (p. 141) uint8_t forebits = pr1620[foreraw]; - /* MPLB is set based on the high bit of the raw foreground data, as an OR over the output */ - /* of the foreground color PROM */ + // MPLB is set based on the high bit of the raw foreground data, as an OR over the output + // of the foreground color PROM uint8_t mplb = (foreraw & 0x80) || ((forebits & 0x0f) == 0); - /* now that we have done all the per-5MHz pixel work, mix the sprites at the scale factor */ + // now that we have done all the per-5MHz pixel work, mix the sprites at the scale factor for (int ix = 0; ix < TURBO_X_SCALE; ix++) { int offs; - /* iterate over live sprites and update them */ - /* the final 32-bit value is: */ - /* CDA0-7 = D0 -D7 */ - /* CDB0-7 = D8 -D15 */ - /* CDC0-7 = D16-D23 */ - /* CDD0-7 = D24-D31 */ + // iterate over live sprites and update them + // the final 32-bit value is: + // CDA0-7 = D0 -D7 + // CDB0-7 = D8 -D15 + // CDC0-7 = D16-D23 + // CDD0-7 = D24-D31 uint8_t plb; - uint32_t sprbits = subroc3d_get_sprite_bits(&sprinfo, &plb); + uint32_t sprbits = get_sprite_bits(&plb); - /* MUX0-3 is selected by PLY0-3 and the sprite enable bits, and is the output */ - /* of IC21/PR1450 (p. 141), unless MPLB = 0, in which case the values are grounded (p. 141) */ + // MUX0-3 is selected by PLY0-3 and the sprite enable bits, and is the output + // of IC21/PR1450 (p. 141), unless MPLB = 0, in which case the values are grounded (p. 141) uint8_t mux; if (mplb) { - offs = (plb ^ 0xff) | /* A0-A7: /PLB0-7 */ - ((m_subroc3d_ply & 0x02) << 7); /* A8: PLY1 */ - mux = pr1450[offs] >> ((m_subroc3d_ply & 0x01) * 4); + offs = (plb ^ 0xff) | // A0-A7: /PLB0-7 + ((m_ply & 0x02) << 7); // A8: PLY1 + mux = pr1450[offs] >> ((m_ply & 0x01) * 4); } else mux = 0; - /* CD0-3 are selected from the sprite bits and MUX0-2 (p. 141) */ + // CD0-3 are selected from the sprite bits and MUX0-2 (p. 141) sprbits = (sprbits >> (mux & 0x07)) & 0x01010101; uint8_t cd = (sprbits >> (24-3)) | (sprbits >> (16-2)) | (sprbits >> (8-1)) | sprbits; - /* MUX3 selects either CD0-3 or the foreground output (p. 141) */ + // MUX3 selects either CD0-3 or the foreground output (p. 141) int finalbits; if (mux & 0x08) finalbits = cd; else finalbits = forebits; - /* we then go through a muxer to select one of the 16 outputs computed above (p. 141) */ - offs = (finalbits & 0x0f) | /* A0-A3: CD0-CD3 */ - ((mux & 0x08) << 1) | /* A4: MUX3 */ - (m_subroc3d_col << 5); /* A5-A8: COL0-COL3 */ + // we then go through a muxer to select one of the 16 outputs computed above (p. 141) + offs = (finalbits & 0x0f) | // A0-A3: CD0-CD3 + ((mux & 0x08) << 1) | // A4: MUX3 + (m_col << 5); // A5-A8: COL0-COL3 dest[x + ix] = pr1419[offs]; } } @@ -798,44 +788,44 @@ uint32_t turbo_state::screen_update_subroc3d(screen_device &screen, bitmap_ind16 * *************************************/ -void turbo_state::buckrog_prepare_sprites(uint8_t y, sprite_info *info) +void buckrog_state::prepare_sprites(uint8_t y) { uint8_t const *const pr5196 = &m_proms[0x100]; - /* initialize the line enable signals to 0 */ - info->ve = 0; - info->lst = 0; + // initialize the line enable signals to 0 + m_sprite_info.ve = 0; + m_sprite_info.lst = 0; - /* compute the sprite information, which was done on the previous scanline during HBLANK */ + // compute the sprite information, which was done on the previous scanline during HBLANK for (int sprnum = 0; sprnum < 16; sprnum++) { uint8_t *const rambase = &m_spriteram[sprnum * 8]; int level = sprnum & 7; - /* perform the first ALU to see if we are within the scanline */ + // perform the first ALU to see if we are within the scanline uint32_t sum = y + (rambase[0]/* ^ 0xff*/); uint8_t clo = (sum >> 8) & 1; sum += (y << 8) + ((rambase[1]/* ^ 0xff*/) << 8); uint8_t chi = (sum >> 16) & 1; - /* the AND of the low carry and the inverse of the high carry clocks an enable bit */ - /* for this sprite; note that the logic in the Turbo schematics is reversed here */ + // the AND of the low carry and the inverse of the high carry clocks an enable bit + // for this sprite; note that the logic in the Turbo schematics is reversed here if (clo & (chi ^ 1)) { int xscale = rambase[2] ^ 0xff; int yscale = rambase[3];// ^ 0xff; uint16_t offset = rambase[6] + (rambase[7] << 8); - /* mark this entry enabled */ - info->ve |= 1 << sprnum; + // mark this entry enabled + m_sprite_info.ve |= 1 << sprnum; - /* look up the low byte of the sum plus the yscale value in */ - /* IC50/PR1119 to determine if we write back the sum of the */ - /* offset and the rowbytes this scanline (p. 138) */ - int offs = (sum & 0xff) | /* A0-A7 = AL0-AL7 */ - ((yscale & 0x08) << 5); /* A8-A9 = /RO11-/RO12 */ + // look up the low byte of the sum plus the yscale value in + // IC50/PR1119 to determine if we write back the sum of the + // offset and the rowbytes this scanline (p. 138) + int offs = (sum & 0xff) | // A0-A7 = AL0-AL7 + ((yscale & 0x08) << 5); // A8-A9 = /RO11-/RO12 - /* one of the bits is selected based on the low 7 bits of yscale */ + // one of the bits is selected based on the low 7 bits of yscale if (!((pr5196[offs] >> (yscale & 0x07)) & 1)) { offset += rambase[4] + (rambase[5] << 8); @@ -843,19 +833,19 @@ void turbo_state::buckrog_prepare_sprites(uint8_t y, sprite_info *info) rambase[7] = offset >> 8; } - /* the output of the ALU here goes to the individual level counter */ - info->latched[level] = 0; - info->plb[level] = 0; - info->offset[level] = offset << 1; - info->frac[level] = 0; - /* 820 verified in schematics */ - info->step[level] = sprite_xscale(xscale, 1.2e3, 820, 220e-12); + // the output of the ALU here goes to the individual level counter + m_sprite_info.latched[level] = 0; + m_sprite_info.plb[level] = 0; + m_sprite_info.offset[level] = offset << 1; + m_sprite_info.frac[level] = 0; + // 820 verified in schematics + m_sprite_info.step[level] = sprite_xscale(xscale, 1.2e3, 820, 220e-12); } } } -uint32_t turbo_state::buckrog_get_sprite_bits(sprite_info *sprinfo, uint8_t *plb) +uint32_t buckrog_state::get_sprite_bits(uint8_t *plb) { /* see logic on each sprite: END = (CDA == 1 && (CDA ^ CDB) == 0 && (CDC ^ CDD) == 0) @@ -867,34 +857,34 @@ uint32_t turbo_state::buckrog_get_sprite_bits(sprite_info *sprinfo, uint8_t *plb *plb = 0; - /* loop over all live levels */ + // loop over all live levels for (int level = 0; level < 8; level++) - if (sprinfo->lst & (1 << level)) + if (m_sprite_info.lst & (1 << level)) { - /* latch the data and advance the offset */ - sprdata |= sprinfo->latched[level]; - *plb |= sprinfo->plb[level]; - sprinfo->frac[level] += sprinfo->step[level]; + // latch the data and advance the offset + sprdata |= m_sprite_info.latched[level]; + *plb |= m_sprite_info.plb[level]; + m_sprite_info.frac[level] += m_sprite_info.step[level]; - /* if we're live and we've clocked more data, advance */ - while (sprinfo->frac[level] >= 0x800000) + // if we're live and we've clocked more data, advance + while (m_sprite_info.frac[level] >= 0x800000) { - uint32_t offs = sprinfo->offset[level]; + uint32_t offs = m_sprite_info.offset[level]; - /* bit 0 controls which half of the byte to use */ - /* bits 1-13 go to address lines */ - /* bit 14 selects which of the two ROMs to read from */ + // bit 0 controls which half of the byte to use + // bits 1-13 go to address lines + // bit 14 selects which of the two ROMs to read from uint8_t pixdata = m_spriteroms[(level << 15) | ((offs >> 1) & 0x7fff)] >> ((~offs & 1) * 4); - sprinfo->latched[level] = sprite_expand[pixdata & 0x0f] << level; - sprinfo->plb[level] = (plb_end[pixdata & 0x0f] & 1) << level; + m_sprite_info.latched[level] = sprite_expand[pixdata & 0x0f] << level; + m_sprite_info.plb[level] = (plb_end[pixdata & 0x0f] & 1) << level; - /* if bit 3 is 0 and bit 2 is 1, the enable flip/flip is reset */ + // if bit 3 is 0 and bit 2 is 1, the enable flip/flip is reset if (plb_end[pixdata & 0x0f] & 2) - sprinfo->lst &= ~(1 << level); + m_sprite_info.lst &= ~(1 << level); - /* if bit 15 is set, we decrement instead of increment */ - sprinfo->offset[level] += (offs & 0x10000) ? -1 : 1; - sprinfo->frac[level] -= 0x800000; + // if bit 15 is set, we decrement instead of increment + m_sprite_info.offset[level] += (offs & 0x10000) ? -1 : 1; + m_sprite_info.frac[level] -= 0x800000; } } @@ -909,60 +899,59 @@ uint32_t turbo_state::buckrog_get_sprite_bits(sprite_info *sprinfo, uint8_t *plb * *************************************/ -uint32_t turbo_state::screen_update_buckrog(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) +uint32_t buckrog_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { bitmap_ind16 &fgpixmap = m_fg_tilemap->pixmap(); uint8_t const *const pr5194 = &m_proms[0x000]; uint8_t const *const pr5198 = &m_proms[0x500]; uint8_t const *const pr5199 = &m_proms[0x700]; - /* loop over rows */ + // loop over rows for (int y = cliprect.min_y; y <= cliprect.max_y; y++) { uint16_t const *const fore = &fgpixmap.pix(y); uint16_t *const dest = &bitmap.pix(y); - sprite_info sprinfo; - /* compute the sprite information; we use y-1 since this info was computed during HBLANK */ - /* on the previous scanline */ - buckrog_prepare_sprites(y, &sprinfo); + // compute the sprite information; we use y-1 since this info was computed during HBLANK + // on the previous scanline + prepare_sprites(y); - /* loop over columns */ + // loop over columns for (int x = 0; x <= cliprect.max_x; x += TURBO_X_SCALE) { uint8_t xx = x / TURBO_X_SCALE; int offs; - /* load the bitmask from the sprite position for both halves of the sprites (p. 143) */ + // load the bitmask from the sprite position for both halves of the sprites (p. 143) uint16_t he = m_sprite_position[xx * 2] | (m_sprite_position[xx * 2 + 1] << 8); - /* the AND of the line enable and horizontal enable is clocked and held in LST0-7 (p. 143) */ - he &= sprinfo.ve; - sprinfo.lst |= he | (he >> 8); + // the AND of the line enable and horizontal enable is clocked and held in LST0-7 (p. 143) + he &= m_sprite_info.ve; + m_sprite_info.lst |= he | (he >> 8); - /* at this point, do the character lookup and the foreground color table lookup in IC93/PR1598 (SH 5/5)*/ + // at this point, do the character lookup and the foreground color table lookup in IC93/PR1598 (SH 5/5) uint8_t foreraw = fore[(pr5194[((xx >> 3) - 1) & 0x1f] << 3) | (xx & 0x07)]; - offs = ((foreraw & 0x03) << 0) | /* A0-A1: BIT0-1 */ - ((foreraw & 0xf8) >> 1) | /* A2-A6: BANK3-7 */ - ((m_buckrog_fchg & 0x03) << 7); /* A7-A9: FCHG0-2 */ + offs = ((foreraw & 0x03) << 0) | // A0-A1: BIT0-1 + ((foreraw & 0xf8) >> 1) | // A2-A6: BANK3-7 + ((m_fchg & 0x03) << 7); // A7-A9: FCHG0-2 uint8_t forebits = pr5198[offs]; - /* fetch the STAR bit */ - uint8_t star = m_buckrog_bitmap_ram[y * 256 + xx]; + // fetch the STAR bit + uint8_t star = m_bitmap_ram[y * 256 + xx]; - /* now that we have done all the per-5MHz pixel work, mix the sprites at the scale factor */ + // now that we have done all the per-5MHz pixel work, mix the sprites at the scale factor for (int ix = 0; ix < TURBO_X_SCALE; ix++) { - /* iterate over live sprites and update them */ - /* the final 32-bit value is: */ - /* CDA0-7 = D0 -D7 */ - /* CDB0-7 = D8 -D15 */ - /* CDC0-7 = D16-D23 */ - /* CDD0-7 = D24-D31 */ + // iterate over live sprites and update them + // the final 32-bit value is: + // CDA0-7 = D0 -D7 + // CDB0-7 = D8 -D15 + // CDC0-7 = D16-D23 + // CDD0-7 = D24-D31 uint8_t plb; - uint32_t sprbits = buckrog_get_sprite_bits(&sprinfo, &plb); + uint32_t sprbits = get_sprite_bits(&plb); - /* the PLB bits go into an LS148 8-to-1 decoder and become MUX0-3 (PROM board SH 2/10) */ + // the PLB bits go into an LS148 8-to-1 decoder and become MUX0-3 (PROM board SH 2/10) uint8_t mux; if (plb == 0) mux = 8; @@ -976,13 +965,13 @@ uint32_t turbo_state::screen_update_buckrog(screen_device &screen, bitmap_ind16 } } - /* MUX then selects one of the sprites and selects CD0-3 */ + // MUX then selects one of the sprites and selects CD0-3 sprbits = (sprbits >> (mux & 0x07)) & 0x01010101; uint8_t cd = (sprbits >> (24-3)) | (sprbits >> (16-2)) | (sprbits >> (8-1)) | sprbits; - /* this info goes into an LS148 8-to-3 decoder to determine the priorities (SH 5/5) */ + // this info goes into an LS148 8-to-3 decoder to determine the priorities (SH 5/5) - /* priority 7 is if bit 0x80 of the foreground color is 0; CHNG = 0 */ + // priority 7 is if bit 0x80 of the foreground color is 0; CHNG = 0 int palbits; if (!(forebits & 0x80)) { @@ -991,16 +980,16 @@ uint32_t turbo_state::screen_update_buckrog(screen_device &screen, bitmap_ind16 ((forebits & 0x01) << 0); } - /* priority 6 is if MUX3 is 0; CHNG = 1 */ + // priority 6 is if MUX3 is 0; CHNG = 1 else if (!(mux & 0x08)) { - offs = (cd & 0x0f) | /* A0-A3: CD0-3 */ - ((mux & 0x07) << 4) | /* A4-A6: MUX0-2 */ - ((m_buckrog_obch & 0x07) << 7); /* A7-A9: OBCH0-2 */ + offs = (cd & 0x0f) | // A0-A3: CD0-3 + ((mux & 0x07) << 4) | // A4-A6: MUX0-2 + ((m_obch & 0x07) << 7); // A7-A9: OBCH0-2 palbits = pr5199[offs]; } - /* priority 3 is if bit 0x40 of the foreground color is 0; CHNG = 0 */ + // priority 3 is if bit 0x40 of the foreground color is 0; CHNG = 0 else if (!(forebits & 0x40)) { palbits = ((forebits & 0x3c) << 2) | @@ -1008,20 +997,20 @@ uint32_t turbo_state::screen_update_buckrog(screen_device &screen, bitmap_ind16 ((forebits & 0x01) << 0); } - /* priority 1 is if the star is set; CHNG = 2 */ + // priority 1 is if the star is set; CHNG = 2 else if (star) { palbits = 0xff; } - /* otherwise, CHNG = 3 */ + // otherwise, CHNG = 3 else { - palbits = m_bgcolorrom[y | ((m_buckrog_mov & 0x1f) << 8)]; + palbits = m_bgcolorrom[y | ((m_mov & 0x1f) << 8)]; palbits = (palbits & 0xc0) | ((palbits & 0x30) << 4) | ((palbits & 0x0f) << 2); } - /* store the final bits for this pixel */ + // store the final bits for this pixel dest[x + ix] = palbits; } } |