// license:BSD-3-Clause // copyright-holders:Olivier Galibert #include "emu.h" #include "k053250_ps.h" #include "screen.h" /* Registers 0 xxxx xxxx X-Scroll [7:0] 1 xxxx xxxx X-Scroll [15:8] 2 xxxx xxxx Y-Scroll [7:0] 3 xxxx xxxx Y-Scroll [15:8] 4 Control .... ...x 0:Swap XY 1:Normal .... ..x. Interrupt related? .... .x.. 0:Disable 1:Enable source clipping .... x... Flip X ...x .... Flip Y xxx. .... Wrap control 5 .... .... Unknown 6 xxxx xxxx ROM access address [7:0] 7 xxxx xxxx ROM access address [15:8] */ DEFINE_DEVICE_TYPE(K053250PS, k053250ps_device, "k053250ps", "K053250PS LVC") k053250ps_device::k053250ps_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, K053250PS, tag, owner, clock), device_gfx_interface(mconfig, *this), device_video_interface(mconfig, *this), m_dmairq_cb(*this), m_rom(*this, DEVICE_SELF) { } void k053250ps_device::unpack_nibbles() { m_unpacked_rom.resize(m_rom.length()*2); for (int i = 0; i < m_rom.length(); i++) { m_unpacked_rom[2*i] = m_rom[i] >> 4; m_unpacked_rom[2*i+1] = m_rom[i] & 0xf; } } void k053250ps_device::device_start() { m_ram.resize(0x6000/2); m_buffer[0] = &m_ram[0x0000]; m_buffer[1] = &m_ram[0x0800]; // m_buffer[0] = &m_ram[0x2000]; // m_buffer[1] = &m_ram[0x2800]; unpack_nibbles(); save_item(NAME(m_ram)); save_item(NAME(m_regs)); save_item(NAME(m_page)); save_item(NAME(m_dmairq_on)); m_dmairq_cb.resolve_safe(); m_timer_lvcdma = timer_alloc(0); } void k053250ps_device::device_reset() { m_page = 0; memset(m_regs, 0, sizeof(m_regs)); m_timer_lvcdma_state = OD_IDLE; m_timer_lvcdma->adjust(attotime::never); m_dmairq_on = false; } // utility function to render a clipped scanline vertically or horizontally inline void k053250ps_device::pdraw_scanline32(bitmap_rgb32 &bitmap, const pen_t *pal_base, uint8_t *source, const rectangle &cliprect, int linepos, int scroll, int zoom, uint32_t clipmask, uint32_t wrapmask, uint32_t orientation, bitmap_ind8 &priority, uint8_t pri) { // a sixteen-bit fixed point resolution should be adequate to our application #define FIXPOINT_PRECISION 16 #define FIXPOINT_PRECISION_HALF (1<<(FIXPOINT_PRECISION-1)) int end_pixel, flip, dst_min, dst_max, dst_start, dst_length; uint32_t src_wrapmask; uint8_t *src_base; int src_fx, src_fdx; int pix_data, dst_offset; uint8_t *pri_base; uint32_t *dst_base; int dst_adv; // flip X and flip Y also switch role when the X Y coordinates are swapped if (!(orientation & ORIENTATION_SWAP_XY)) { flip = orientation & ORIENTATION_FLIP_X; dst_min = cliprect.min_x; dst_max = cliprect.max_x; } else { flip = orientation & ORIENTATION_FLIP_Y; dst_min = cliprect.min_y; dst_max = cliprect.max_y; } if (clipmask) { // reject scanlines that are outside of the target bitmap's right(bottom) clip boundary dst_start = -scroll; if (dst_start > dst_max) return; // calculate target length dst_length = clipmask + 1; if (zoom) dst_length = (dst_length << 6) / zoom; // reject scanlines that are outside of the target bitmap's left(top) clip boundary end_pixel = dst_start + dst_length - 1; if (end_pixel < dst_min) return; // clip scanline tail if ((end_pixel -= dst_max) > 0) dst_length -= end_pixel; // reject 0-length scanlines if (dst_length <= 0) return; // calculate zoom factor src_fdx = zoom << (FIXPOINT_PRECISION-6); // clip scanline head end_pixel = dst_min; if ((end_pixel -= dst_start) > 0) { // chop scanline to the correct length and move target start location to the left(top) clip boundary dst_length -= end_pixel; dst_start = dst_min; // and skip the source for the left(top) clip region src_fx = end_pixel * src_fdx + FIXPOINT_PRECISION_HALF; } else // the point five bias is to ensure even distribution of stretched or shrinked pixels src_fx = FIXPOINT_PRECISION_HALF; // adjust flipped source if (flip) { // start from the target's clipped end if the scanline is flipped dst_start = dst_max + dst_min - dst_start - (dst_length-1); // and move source start location to the opposite end src_fx += (dst_length-1) * src_fdx - 1; src_fdx = -src_fdx; } } else { // draw wrapped scanline at virtual bitmap boundary when source clipping is off dst_start = dst_min; dst_length = dst_max - dst_min + 1; // target scanline spans the entire visible area src_fdx = zoom << (FIXPOINT_PRECISION-6); // pre-advance source for the clipped region if (!flip) src_fx = (scroll + dst_min) * src_fdx + FIXPOINT_PRECISION_HALF; else { src_fx = (scroll + dst_max) * src_fdx + FIXPOINT_PRECISION_HALF-1; src_fdx = -src_fdx; } } if (!(orientation & ORIENTATION_SWAP_XY)) { // calculate target increment for horizontal scanlines which is exactly one dst_adv = 1; dst_offset = dst_length; pri_base = &priority.pix8(linepos, dst_start + dst_offset); dst_base = &bitmap.pix32(linepos, dst_start + dst_length); } else { // calculate target increment for vertical scanlines which is the bitmap's pitch value dst_adv = bitmap.rowpixels(); dst_offset= dst_length * dst_adv; pri_base = &priority.pix8(dst_start, linepos + dst_offset); dst_base = &bitmap.pix32(dst_start, linepos + dst_offset); } // generalized src_base = source; // there is no need to wrap source offsets along with source clipping // so we set all bits of the wrapmask to one src_wrapmask = (clipmask) ? ~0 : wrapmask; dst_offset = -dst_offset; // negate target offset in order to terminated draw loop at 0 condition if (pri) { // draw scanline and update priority bitmap do { pix_data = src_base[(src_fx>>FIXPOINT_PRECISION) & src_wrapmask]; src_fx += src_fdx; if (pix_data) { pix_data = pal_base[pix_data]; pri_base[dst_offset] = pri; dst_base[dst_offset] = pix_data; } } while (dst_offset += dst_adv); } else { // draw scanline but do not update priority bitmap do { pix_data = src_base[(src_fx>>FIXPOINT_PRECISION) & src_wrapmask]; src_fx += src_fdx; if (pix_data) { dst_base[dst_offset] = pal_base[pix_data]; } } while (dst_offset += dst_adv); } #undef FIXPOINT_PRECISION #undef FIXPOINT_PRECISION_HALF } void k053250ps_device::draw( bitmap_rgb32 &bitmap, const rectangle &cliprect, int colorbase, int flags, bitmap_ind8 &priority_bitmap, int priority ) { static int16_t scroll_x; if (machine().input().code_pressed(KEYCODE_A)) { scroll_x--; popmessage("SCROLL: %d\n", scroll_x); } else if (machine().input().code_pressed(KEYCODE_S)) { scroll_x++; popmessage("SCROLL: %d\n", scroll_x); } uint8_t *pix_ptr; const pen_t *pal_base, *pal_ptr; uint32_t src_clipmask, src_wrapmask; //, dst_wrapmask; int linedata_offs, line_pos, line_start, line_end, scroll_corr; int color, offset, zoom, scroll, passes, i; bool wrap500 = false; uint16_t *line_ram = m_buffer[0]; // pointer to physical line RAM int map_scrollx = short(m_regs[0] << 8 | m_regs[1]) - m_offx; // signed horizontal scroll value int map_scrolly = short(m_regs[2] << 8 | m_regs[3]) - m_offy; // signed vertical scroll value uint8_t ctrl = m_regs[4]; // register four is the main control register // copy visible boundary values to more accessible locations int dst_minx = cliprect.min_x; int dst_maxx = cliprect.max_x; int dst_miny = cliprect.min_y; int dst_maxy = cliprect.max_y; int orientation = 0; // orientation defaults to no swapping and no flipping int dst_height = 512; // virtual bitmap height defaults to 512 pixels int linedata_adv = 4; // line info packets are four words(eight bytes) apart // switch X and Y parameters when the first bit of the control register is cleared if (!(ctrl & 0x01)) orientation |= ORIENTATION_SWAP_XY; // invert X parameters when the forth bit of the control register is set if (ctrl & 0x08) orientation |= ORIENTATION_FLIP_X; // invert Y parameters when the fifth bit of the control register is set if (ctrl & 0x10) orientation |= ORIENTATION_FLIP_Y; //printf("CTRL: %x\n", ctrl); // 00 // 0x12 // 0x10 switch (ctrl >> 5) // the upper four bits of the control register select source and target dimensions { case 0 : // PirateSH // Xexex: L6 galaxies // Metam: L4 forest, L5 arena, L6 tower interior, final boss // crop source offset between 0 and 255 inclusive, // and set virtual bitmap height to 256 pixels src_wrapmask = src_clipmask = 0xff; dst_height = 0x100; break; case 1 : // Xexex: prologue, L7 nebulae // the source offset is cropped to 0 and 511 inclusive src_wrapmask = src_clipmask = 0x1ff; break; case 4 : // Xexex: L1 sky and boss, L3 planet, L5 poly-face, L7 battle ship patches // Metam: L1 summoning circle, L3 caves, L6 gargoyle towers // crop source offset between 0 and 255 inclusive, // and allow source offset to wrap back at 0x500 to -0x300 src_wrapmask = src_clipmask = 0xff; wrap500 = true; break; // case 2 : // Xexex: title // case 7 : // Xexex: L4 organic stage default: // crop source offset between 0 and 1023 inclusive, // keep other dimensions to their defaults src_wrapmask = src_clipmask = 0x3ff; break; } // disable source clipping when the third bit of the control register is set if (ctrl & 0x04) src_clipmask = 0; if (!(orientation & ORIENTATION_SWAP_XY)) // normal orientaion with no X Y switching { line_start = dst_miny; // the first scanline starts at the minimum Y clip location line_end = dst_maxy; // the last scanline ends at the maximum Y clip location scroll_corr = map_scrollx; // concentrate global X scroll linedata_offs = map_scrolly; // determine where to get info for the first line if (orientation & ORIENTATION_FLIP_X) { scroll_corr = -scroll_corr; // X scroll adjustment should be negated in X flipped scenarioes } if (orientation & ORIENTATION_FLIP_Y) { linedata_adv = -linedata_adv; // traverse line RAM backward in Y flipped scenarioes linedata_offs += bitmap.height() - 1; // and get info for the first line from the bottom } // dst_wrapmask = ~0; // scanlines don't seem to wrap horizontally in normal orientation passes = 1; // draw scanline in a single pass } else // orientaion with X and Y parameters switched { line_start = dst_minx; // the first scanline starts at the minimum X clip location line_end = dst_maxx; // the last scanline ends at the maximum X clip location scroll_corr = map_scrolly; // concentrate global Y scroll linedata_offs = map_scrollx; // determine where to get info for the first line if (orientation & ORIENTATION_FLIP_Y) { scroll_corr = 0x100 - scroll_corr; // apply common vertical correction // Y correction (ref: 1st and 5th boss) scroll_corr -= 2; // apply unique vertical correction // X correction (ref: 1st boss, seems to undo non-rotated global X offset) linedata_offs -= 5; // apply unique horizontal correction } if (orientation & ORIENTATION_FLIP_X) { linedata_adv = -linedata_adv; // traverse line RAM backward in X flipped scenarioes linedata_offs += bitmap.width() - 1; // and get info for the first line from the bottom } if (src_clipmask) { // determine target wrap boundary and draw scanline in two passes if the source is clipped // dst_wrapmask = dst_height - 1; passes = 2; } else { // otherwise disable target wraparound and draw scanline in a single pass // dst_wrapmask = ~0; passes = 1; } } // PJB - HOW IS THIS DETERMINED? src_clipmask = 0; linedata_offs *= 4; // each line info packet has four words(eight bytes) linedata_offs &= 0x7ff; // and it should wrap at the four-kilobyte boundary linedata_offs += line_start * linedata_adv; // pre-advance line info offset for the clipped region // load physical palette base pal_base = palette().pens() + (colorbase << 4) % palette().entries(); //printf("Line Start: %u Line End: %u Advance: %u\n", line_start, line_end, linedata_adv); // walk the target bitmap within the visible area vertically or horizontally, one line at a time for (line_pos=line_start; line_pos <= line_end; linedata_offs += linedata_adv, line_pos++) { linedata_offs &= 0x7ff; // line info data wraps at the four-kilobyte boundary color = line_ram[linedata_offs]; // get scanline color code if (color == 0xffff) continue; // reject scanline if color code equals minus one offset = line_ram[linedata_offs + 1]; // get first pixel offset in ROM if (!(color & 0xff) && !offset) continue; // reject scanline if both color and pixel offset are 0 // calculate physical palette location // there can be thirty-two color codes and each code represents sixteen pens pal_ptr = pal_base + ((color & 0x1f) << 4); // calculate physical pixel location // each offset unit represents 256 pixels and should wrap at ROM boundary for safety pix_ptr = &m_unpacked_rom[((offset << 8) % m_unpacked_rom.size())]; // get scanline zoom factor // For example, 0x20 doubles the length, 0x40 maintains a one-to-one length, // and 0x80 halves the length. The zoom center is at the beginning of the // scanline therefore it is not necessary to adjust render start position zoom = line_ram[linedata_offs + 2]; scroll = ((short)line_ram[linedata_offs + 3]); // get signed local scroll value for the current scanline // scavenged from old code; improves Xexex' first level sky if (wrap500 && scroll >= 0x500) scroll -= 0x800; if (1 && scroll >= 0x500) scroll -= 0x800; scroll += scroll_corr; // apply final scroll correction // PJB //scroll &= src_wrapmask; // wraparound scroll value if necessary if (0) { printf("%u: [%x] COLR:%x OFFS:%x ZOOM:%x SCRL:%d (%.4x)\n", line_pos, linedata_offs, color, offset, zoom, scroll, line_ram[linedata_offs + 3]); } // draw scanlines wrapped at virtual bitmap boundary in two passes // this should not impose too much overhead due to clipping performed by the render code i = passes; do { /* Parameter descriptions: bitmap : pointer to a MAME bitmap as the render target pal_ptr : pointer to the palette's physical location relative to the scanline pix_ptr : pointer to the physical start location of source pixels in ROM cliprect : pointer to a rectangle structue which describes the visible area of the target bitmap line_pos : scanline render position relative to the target bitmap should be a Y offset to the target bitmap in normal orientaion, or an X offset to the target bitmap if X,Y are swapped scroll : source scroll value of the scanline zoom : source zoom factor of the scanline src_clipmask : source offset clip mask; source pixels with offsets beyond the scope of this mask will not be drawn src_wrapmask : source offset wrap mask; wraps source offset around, no effect when src_clipmask is set orientation : flags indicating whether scanlines should be drawn horizontally, vertically, forward or backward priority : value to be written to the priority bitmap, no effect when equals 0 */ pdraw_scanline32(bitmap, pal_ptr, pix_ptr, cliprect, line_pos, scroll, zoom, src_clipmask, src_wrapmask, orientation, priority_bitmap, (uint8_t)priority); // shift scanline position one virtual screen upward to render the wrapped end if necessary scroll -= dst_height; } while (--i); } } READ16_MEMBER(k053250ps_device::reg_r) { return m_regs[offset]; } void k053250ps_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) { switch(m_timer_lvcdma_state) { case OD_WAIT_START: m_timer_lvcdma_state = OD_WAIT_END; m_timer_lvcdma->adjust(attotime::from_ticks(4096, clock())); m_dmairq_cb(ASSERT_LINE); // memcpy(m_buffer[m_page], &m_ram[0], 0x1000); // m_page ^= 1; break; case OD_WAIT_END: m_timer_lvcdma_state = OD_IDLE; m_timer_lvcdma->adjust(attotime::never); m_dmairq_cb(CLEAR_LINE); if(/*(m_regs[4] & 0x02) &&*/ !m_dmairq_on) { m_dmairq_on = true; m_dmairq_cb(ASSERT_LINE); } break; } } WRITE_LINE_MEMBER(k053250ps_device::vblank_w) { if (state == 1) { if (1) { if(m_dmairq_on) { m_dmairq_on = false; m_dmairq_cb(CLEAR_LINE); } m_timer_lvcdma_state = OD_WAIT_START; m_timer_lvcdma->adjust(attotime::from_ticks(256, clock())); } else { //memset(m_sram, 0, sizeof(m_sram)); } } } READ_LINE_MEMBER(k053250ps_device::dmairq_r) { return !m_dmairq_on; } WRITE16_MEMBER(k053250ps_device::reg_w) { #if 0 static const char * regnames[] = { "SCROLL_X_L", "SCROLL_X_H", "SCROLL_Y_L", "SCROLL_X_H", "DMA Control", "UNKNOWN", "ROM_H", "ROM_L", }; printf("053250 REG_W[%x] (%s): %.2x\n", offset, regnames[offset], data & 0xff); #endif if (ACCESSING_BITS_0_7) m_regs[offset] = data; } READ16_MEMBER(k053250ps_device::ram_r) { return m_ram[offset]; } WRITE16_MEMBER(k053250ps_device::ram_w) { COMBINE_DATA(&m_ram[offset]); } READ16_MEMBER(k053250ps_device::rom_r) { return m_rom[0x80000 * m_regs[6] + 0x800 * m_regs[7] + offset/2]; }