// license:BSD-3-Clause // copyright-holders:Wilbert Pol, Enik Land /********************************************************************* sega315_5124.cpp Implementation of video hardware chips used by Sega System E, Master System, and Game Gear. **********************************************************************/ /* To do: - Display mode 1 (text) - Display mode 3 (multicolor) - Sprite doubling bug of the 315-5124 chip - Verify timing on the Game Gear (315-5378 chip) SMS Display Timing ------------------ For more information, please see: - http://cgfm2.emuviews.com/txt/msvdp.txt - http://www.smspower.org/forums/viewtopic.php?p=44198 A scanline contains the following sections: - horizontal sync 9 E9-ED => HSYNC high - left blanking 2 ED-EE - color burst 14 EE-F5 => increment line counter/generate interrupts/etc - left blanking 8 F5-F9 - left border 13 F9-FF - active display 256 00-7F - right border 15 80-87 - right blanking 8 87-8B - horizontal sync 17 8B-93 => HSYNC low Although the processing done for a section happens when HCount is in the specified range (e.g. 00-7F for active display), probably there is a delay until its signal is shown on screen, as happens on the TMS9918 chip according to this timing diagram: http://www.smspower.org/Development/TMS9918MasterTimingDiagram NTSC frame timing 256x192 256x224 256x240 (doesn't work on real hardware) - vertical sync 3 D5-D7 3 E5-E7 3 ED-EF - top blanking 13 D8-E4 13 E8-F4 13 F0-FC - top border 27 E5-FF 11 F5-FF 3 FD-FF - active display 192 00-BF 224 00-DF 240 00-EF - bottom border 24 C0-D7 8 E0-E7 0 F0-F0 - bottom blanking 3 D8-DA 3 E8-EA 3 F0-F2 PAL frame timing 256x192 256x224 256x240 - vertical sync 3 BA-BC 3 CA-CC 3 D2-D4 - top blanking 13 BD-C9 13 CD-D9 13 D5-E1 - top border 54 CA-FF 38 DA-FF 30 E2-FF - active display 192 00-BF 224 00-DF 240 00-EF - bottom border 48 C0-EF 32 E0-FF 24 F0-07 - bottom blanking 3 F0-F2 3 00-02 3 08-0A */ #include "emu.h" #include "video/315_5124.h" #define SEGA315_5124_PALETTE_SIZE (64 + 16) #define SEGA315_5378_PALETTE_SIZE 4096 #define VRAM_SIZE 0x4000 #define STATUS_VINT 0x80 /* Pending vertical interrupt flag */ #define STATUS_SPROVR 0x40 /* Sprite overflow flag */ #define STATUS_SPRCOL 0x20 /* Object collision flag */ #define STATUS_HINT 0x02 /* Pending horizontal interrupt flag */ #define VINT_HPOS 24 #define VINT_FLAG_HPOS 24 #define HINT_HPOS 26 #define NMI_HPOS 28 /* not verified */ #define VCOUNT_CHANGE_HPOS 23 #define SPROVR_HPOS 24 #define SPRCOL_BASEHPOS 59 #define XSCROLL_HPOS 21 #define DISPLAY_DISABLED_HPOS 24 /* not verified, works if above 18 (for 'pstrike2') and below 25 (for 'fantdizzy') */ #define DISPLAY_CB_HPOS 2 /* fixes 'roadrash' (SMS game) title scrolling, due to line counter reload timing */ #define DRAW_TIME_GG 94 /* 9 + 2 + 14 + 8 + 13 + 96/2 */ #define DRAW_TIME_SMS 46 /* 9 + 2 + 14 + 8 + 13 */ #define PRIORITY_BIT 0x1000 #define BACKDROP_COLOR ((m_vdp_mode == 4 ? 0x10 : 0x00) + (m_reg[0x07] & 0x0f)) #define VERTICAL_SYNC 0 #define TOP_BLANKING 1 #define TOP_BORDER 2 #define ACTIVE_DISPLAY_V 3 #define BOTTOM_BORDER 4 #define BOTTOM_BLANKING 5 static constexpr uint8_t ntsc_192[6] = { 3, 13, 27, 192, 24, 3 }; static constexpr uint8_t ntsc_224[6] = { 3, 13, 11, 224, 8, 3 }; static constexpr uint8_t ntsc_240[6] = { 3, 13, 3, 240, 0, 3 }; static constexpr uint8_t pal_192[6] = { 3, 13, 54, 192, 48, 3 }; static constexpr uint8_t pal_224[6] = { 3, 13, 38, 224, 32, 3 }; static constexpr uint8_t pal_240[6] = { 3, 13, 30, 240, 24, 3 }; DEFINE_DEVICE_TYPE(SEGA315_5124, sega315_5124_device, "sega315_5124", "Sega 315-5124 SMS1 VDP") DEFINE_DEVICE_TYPE(SEGA315_5246, sega315_5246_device, "sega315_5246", "Sega 315-5246 SMS2 VDP") DEFINE_DEVICE_TYPE(SEGA315_5378, sega315_5378_device, "sega315_5378", "Sega 315-5378 Gamegear VDP") PALETTE_INIT_MEMBER(sega315_5124_device, sega315_5124) { int i; for (i = 0; i < 64; i++) { int r = i & 0x03; int g = (i & 0x0c) >> 2; int b = (i & 0x30) >> 4; palette.set_pen_color(i, pal2bit(r), pal2bit(g), pal2bit(b)); } /* sms and sg1000-mark3 uses a different palette for modes 0 to 3 - see http://www.smspower.org/Development/Palette */ /* TMS9918 palette */ palette.set_pen_color(64+ 0, 0, 0, 0); // palette.set_pen_color(64+ 0, 0, 0, 0); palette.set_pen_color(64+ 1, 0, 0, 0); // palette.set_pen_color(64+ 1, 0, 0, 0); palette.set_pen_color(64+ 2, 0, 170, 0); // palette.set_pen_color(64+ 2, 33, 200, 66); palette.set_pen_color(64+ 3, 0, 255, 0); // palette.set_pen_color(64+ 3, 94, 220, 120); palette.set_pen_color(64+ 4, 0, 0, 85); // palette.set_pen_color(64+ 4, 84, 85, 237); palette.set_pen_color(64+ 5, 0, 0, 255); // palette.set_pen_color(64+ 5, 125, 118, 252); palette.set_pen_color(64+ 6, 85, 0, 0); // palette.set_pen_color(64+ 6, 212, 82, 77); palette.set_pen_color(64+ 7, 0, 255, 255); // palette.set_pen_color(64+ 7, 66, 235, 245); palette.set_pen_color(64+ 8, 170, 0, 0); // palette.set_pen_color(64+ 8, 252, 85, 84); palette.set_pen_color(64+ 9, 255, 0, 0); // palette.set_pen_color(64+ 9, 255, 121, 120); palette.set_pen_color(64+10, 85, 85, 0); // palette.set_pen_color(64+10, 212, 193, 84); palette.set_pen_color(64+11, 255, 255, 0); // palette.set_pen_color(64+11, 230, 206, 128); palette.set_pen_color(64+12, 0, 85, 0); // palette.set_pen_color(64+12, 33, 176, 59); palette.set_pen_color(64+13, 255, 0, 255); // palette.set_pen_color(64+13, 201, 91, 186); palette.set_pen_color(64+14, 85, 85, 85); // palette.set_pen_color(64+14, 204, 204, 204); palette.set_pen_color(64+15, 255, 255, 255); // palette.set_pen_color(64+15, 255, 255, 255); } PALETTE_INIT_MEMBER(sega315_5378_device, sega315_5378) { int i; for (i = 0; i < 4096; i++) { int r = i & 0x000f; int g = (i & 0x00f0) >> 4; int b = (i & 0x0f00) >> 8; palette.set_pen_color(i, pal4bit(r), pal4bit(g), pal4bit(b)); } } // default address map void sega315_5124_device::sega315_5124(address_map &map) { map(0x0000, VRAM_SIZE-1).ram(); } sega315_5124_device::sega315_5124_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : sega315_5124_device(mconfig, SEGA315_5124, tag, owner, clock, SEGA315_5124_CRAM_SIZE, 0, false) { } sega315_5124_device::sega315_5124_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock, uint8_t cram_size, uint8_t palette_offset, bool supports_224_240) : device_t(mconfig, type, tag, owner, clock) , device_memory_interface(mconfig, *this) , device_video_interface(mconfig, *this) , m_cram_size( cram_size ) , m_palette_offset( palette_offset ) , m_supports_224_240( supports_224_240 ) , m_is_pal(false) , m_int_cb(*this) , m_csync_cb(*this) , m_pause_cb(*this) , m_space_config("videoram", ENDIANNESS_LITTLE, 8, 14, 0, address_map_constructor(), address_map_constructor(FUNC(sega315_5124_device::sega315_5124), this)) , m_palette(*this, "palette") { } sega315_5246_device::sega315_5246_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : sega315_5124_device(mconfig, SEGA315_5246, tag, owner, clock, SEGA315_5124_CRAM_SIZE, 0, true) { } sega315_5378_device::sega315_5378_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : sega315_5124_device(mconfig, SEGA315_5378, tag, owner, clock, SEGA315_5378_CRAM_SIZE, 0x10, true) { } device_memory_interface::space_config_vector sega315_5124_device::memory_space_config() const { return space_config_vector { std::make_pair(0, &m_space_config) }; } void sega315_5124_device::set_display_settings() { const bool M1 = m_reg[0x01] & 0x10; const bool M2 = m_reg[0x00] & 0x02; const bool M3 = m_reg[0x01] & 0x08; const bool M4 = m_reg[0x00] & 0x04; m_y_pixels = 192; if (M4) { /* mode 4 */ m_vdp_mode = 4; if ( m_supports_224_240 ) { if (M2) { if (M1 && !M3) { m_y_pixels = 224; /* 224-line display */ } else if (!M1 && M3) { m_y_pixels = 240; /* 240-line display */ } } } } else { /* original TMS9918 mode */ if (!M1 && !M2 && !M3) { m_vdp_mode = 0; } #if 0 /* Mode 1, not implemented */ else if (M1 && !M2 && !M3) { m_vdp_mode = 1; } #endif else if (!M1 && M2 && !M3) { m_vdp_mode = 2; } #if 0 /* Mode 3, not implemented */ else if (!M1 && !M2 && M3) { m_vdp_mode = 3; } #endif else { logerror("Unknown video mode detected (M1 = %c, M2 = %c, M3 = %c, M4 = %c)\n", M1 ? '1' : '0', M2 ? '1' : '0', M3 ? '1' : '0', M4 ? '1' : '0'); } } set_frame_timing(); m_cram_dirty = 1; } void sega315_5124_device::set_frame_timing() { switch (m_y_pixels) { case 192: m_frame_timing = (m_is_pal) ? pal_192 : ntsc_192; break; case 224: m_frame_timing = (m_is_pal) ? pal_224 : ntsc_224; break; case 240: m_frame_timing = (m_is_pal) ? pal_240 : ntsc_240; break; } } READ8_MEMBER( sega315_5124_device::vcount_read ) { const int active_scr_start = m_frame_timing[VERTICAL_SYNC] + m_frame_timing[TOP_BLANKING] + m_frame_timing[TOP_BORDER]; int vpos = screen().vpos(); if (screen().hpos() < VCOUNT_CHANGE_HPOS) { vpos--; if (vpos < 0) vpos += screen().height(); } return (vpos - active_scr_start) & 0xff; } READ8_MEMBER( sega315_5124_device::hcount_read ) { return m_hcounter; } void sega315_5124_device::hcount_latch_at_hpos( int hpos ) { const int active_scr_start = 46; /* 9 + 2 + 14 + 8 + 13 */ /* The hcount value returned by the VDP seems to be based on the previous hpos */ int hclock = hpos - 1; if (hclock < 0) hclock += WIDTH; m_hcounter = ((hclock - active_scr_start) >> 1) & 0xff; } void sega315_5378_device::set_sega315_5124_compatibility_mode( bool sega315_5124_compatibility_mode ) { m_sega315_5124_compatibility_mode = sega315_5124_compatibility_mode; m_cram_mask = (!m_sega315_5124_compatibility_mode) ? (SEGA315_5378_CRAM_SIZE - 1) : (SEGA315_5124_CRAM_SIZE - 1); m_draw_time = m_sega315_5124_compatibility_mode ? DRAW_TIME_SMS : DRAW_TIME_GG; } void sega315_5124_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) { switch( id ) { case TIMER_LINE: process_line_timer(); break; case TIMER_FLAGS: /* Activate flags that were pending until the end of the line. */ check_pending_flags(); break; case TIMER_DRAW: update_palette(); draw_scanline( LBORDER_START + LBORDER_WIDTH, param, screen().vpos() - param ); break; case TIMER_LBORDER: { rectangle rec; rec.min_y = rec.max_y = param; update_palette(); /* Draw left border */ rec.min_x = LBORDER_START; rec.max_x = LBORDER_START + LBORDER_WIDTH - 1; m_tmpbitmap.fill(m_palette->pen(m_current_palette[BACKDROP_COLOR]), rec); m_y1_bitmap.fill(( m_reg[0x07] & 0x0f ) ? 1 : 0, rec); } break; case TIMER_RBORDER: { rectangle rec; rec.min_y = rec.max_y = param; update_palette(); /* Draw right border */ rec.min_x = LBORDER_START + LBORDER_WIDTH + 256; rec.max_x = rec.min_x + RBORDER_WIDTH - 1; m_tmpbitmap.fill(m_palette->pen(m_current_palette[BACKDROP_COLOR]), rec); m_y1_bitmap.fill(( m_reg[0x07] & 0x0f ) ? 1 : 0, rec); } break; case TIMER_HINT: if ((m_pending_status & STATUS_HINT) || (m_status & STATUS_HINT)) { if ((m_reg[0x00] & 0x10)) { m_irq_state = 1; if ( !m_int_cb.isnull() ) m_int_cb(ASSERT_LINE); } } break; case TIMER_VINT: if ((m_pending_status & STATUS_VINT) || (m_status & STATUS_VINT)) { if ((m_reg[0x01] & 0x20)) { m_irq_state = 1; if ( !m_int_cb.isnull() ) m_int_cb(ASSERT_LINE); } } break; case TIMER_NMI: if ( !m_pause_cb.isnull() ) m_pause_cb(0); break; } } void sega315_5124_device::process_line_timer() { const int vpos = screen().vpos(); int vpos_limit = m_frame_timing[VERTICAL_SYNC] + m_frame_timing[TOP_BLANKING] + m_frame_timing[TOP_BORDER] + m_frame_timing[ACTIVE_DISPLAY_V] + m_frame_timing[BOTTOM_BORDER] + m_frame_timing[BOTTOM_BLANKING]; /* copy current values in case they are not changed until latch time */ m_display_disabled = !(m_reg[0x01] & 0x40); m_reg8copy = m_reg[0x08]; /* Check if the /CSYNC signal must be active (low) */ if ( !m_csync_cb.isnull() ) { /* /CSYNC is signals /HSYNC and /VSYNC (both internals) ANDed together. According to Charles MacDonald, /HSYNC goes low for 28 pixels on beginning (before active screen) of all lines except on vertical sync area, where /VSYNC goes low for 3 full lines, and except the two lines that follows, because /VSYNC goes high for another line and remains high until the active screen of the next line, what avoids a /HSYNC pulse there. */ if (vpos == 0 || vpos > (m_frame_timing[VERTICAL_SYNC] + 1)) { m_csync_cb(0); } } vpos_limit -= m_frame_timing[BOTTOM_BLANKING]; /* Check if we're below the bottom border */ if (vpos >= vpos_limit) { m_line_counter = m_reg[0x0a]; return; } vpos_limit -= m_frame_timing[BOTTOM_BORDER]; /* Check if we're in the bottom border area */ if (vpos >= vpos_limit) { if (vpos == vpos_limit) { if (m_line_counter == 0x00) { m_line_counter = m_reg[0x0a]; m_hint_timer->adjust( screen().time_until_pos( vpos, HINT_HPOS ) ); m_pending_status |= STATUS_HINT; } else { m_line_counter--; } } else { m_line_counter = m_reg[0x0a]; } if (vpos == vpos_limit + 1) { m_vint_timer->adjust( screen().time_until_pos( vpos, VINT_HPOS ) ); m_pending_status |= STATUS_VINT; } /* Draw borders */ m_lborder_timer->adjust( screen().time_until_pos( vpos, LBORDER_START ), vpos ); m_rborder_timer->adjust( screen().time_until_pos( vpos, LBORDER_START + LBORDER_WIDTH + 256 ), vpos ); /* Draw middle of the border */ /* We need to do this through the regular drawing function */ /* so sprite collisions can occur on the border. */ select_sprites( vpos - (vpos_limit - m_frame_timing[ACTIVE_DISPLAY_V]) ); m_draw_timer->adjust( screen().time_until_pos( vpos, m_draw_time ), vpos_limit - m_frame_timing[ACTIVE_DISPLAY_V] ); return; } vpos_limit -= m_frame_timing[ACTIVE_DISPLAY_V]; /* Check if we're in the active display area */ if (vpos >= vpos_limit) { if (vpos == vpos_limit) { m_reg9copy = m_reg[0x09]; } if (m_line_counter == 0x00) { m_line_counter = m_reg[0x0a]; m_hint_timer->adjust( screen().time_until_pos( vpos, HINT_HPOS ) ); m_pending_status |= STATUS_HINT; } else { m_line_counter--; } /* Draw borders */ m_lborder_timer->adjust( screen().time_until_pos( vpos, LBORDER_START ), vpos ); m_rborder_timer->adjust( screen().time_until_pos( vpos, LBORDER_START + LBORDER_WIDTH + 256 ), vpos ); /* Draw active display */ select_sprites( vpos - vpos_limit ); m_draw_timer->adjust( screen().time_until_pos( vpos, m_draw_time ), vpos_limit ); return; } vpos_limit -= m_frame_timing[TOP_BORDER]; /* Check if we're in the top border area */ if (vpos >= vpos_limit) { m_line_counter = m_reg[0x0a]; /* Check if we're on the last line of the top border */ if (vpos == vpos_limit + m_frame_timing[TOP_BORDER] - 1) { m_nmi_timer->adjust( screen().time_until_pos( vpos, NMI_HPOS ) ); } /* Draw borders */ m_lborder_timer->adjust( screen().time_until_pos( vpos, LBORDER_START ), vpos ); m_rborder_timer->adjust( screen().time_until_pos( vpos, LBORDER_START + LBORDER_WIDTH + 256 ), vpos ); /* Draw middle of the border */ /* We need to do this through the regular drawing function */ /* so sprite collisions can occur on the border. */ select_sprites( vpos - (vpos_limit + m_frame_timing[TOP_BORDER]) ); m_draw_timer->adjust( screen().time_until_pos( vpos, m_draw_time ), vpos_limit + m_frame_timing[TOP_BORDER] ); return; } /* we're in the vertical sync or top blanking areas */ m_line_counter = m_reg[0x0a]; } READ8_MEMBER( sega315_5124_device::vram_read ) { uint8_t temp; /* SMS 2 & GG behaviour. Seems like the latched data is passed straight through */ /* to the address register when in the middle of doing a command. */ /* Cosmic Spacehead needs this, among others */ /* Clear pending write flag */ m_pending_reg_write = 0; /* Return read buffer contents */ temp = m_buffer; if ( !machine().side_effects_disabled() ) { /* Load read buffer */ m_buffer = this->space().read_byte(m_addr & 0x3fff); /* Bump internal address register */ m_addr += 1; } return temp; } void sega315_5124_device::check_pending_flags() { int hpos; if (!m_pending_status) { return; } /* A timer ensures that this function will run at least at end of each line. When this function runs through a CPU instruction executed when the timer was about to fire, the time added in the CPU timeslice may make hpos() return some position in the beginning of next line. To ensure the instruction will get updated status, here a maximum hpos is set if the timer reports no remaining time, what could also occur due to the ahead time of the timeslice. */ if (m_pending_flags_timer->remaining() == attotime::zero) { hpos = WIDTH - 1; } else { hpos = screen().hpos(); } if ((m_pending_status & STATUS_HINT) && hpos >= HINT_HPOS) { m_pending_status &= ~STATUS_HINT; m_status |= STATUS_HINT; // fake flag, it is overridden on register read. } if ((m_pending_status & STATUS_VINT) && hpos >= VINT_FLAG_HPOS) { m_pending_status &= ~STATUS_VINT; m_status |= STATUS_VINT; } if ((m_pending_status & STATUS_SPROVR) && hpos >= SPROVR_HPOS) { m_pending_status &= ~STATUS_SPROVR; m_status |= STATUS_SPROVR; } if ((m_pending_status & STATUS_SPRCOL) && hpos >= m_pending_sprcol_x) { m_pending_status &= ~STATUS_SPRCOL; m_status |= STATUS_SPRCOL; m_pending_sprcol_x = 0; } } READ8_MEMBER( sega315_5124_device::register_read ) { uint8_t temp; check_pending_flags(); temp = m_status; if ( !machine().side_effects_disabled() ) { /* Clear pending write flag */ m_pending_reg_write = 0; m_status &= ~(STATUS_VINT | STATUS_SPROVR | STATUS_SPRCOL | STATUS_HINT); if (m_irq_state == 1) { m_irq_state = 0; if ( !m_int_cb.isnull() ) m_int_cb(CLEAR_LINE); } } /* low 5 bits return non-zero data (it fixes PGA Tour Golf course map introduction) */ return temp | 0x1f; } WRITE8_MEMBER( sega315_5124_device::vram_write ) { /* SMS 2 & GG behaviour. Seems like the latched data is passed straight through */ /* to the address register when in the middle of doing a command. */ /* Cosmic Spacehead needs this, among others */ /* Clear pending write flag */ m_pending_reg_write = 0; switch(m_addrmode) { case 0x00: case 0x01: case 0x02: this->space().write_byte(m_addr & 0x3fff, data); break; case 0x03: cram_write(data); break; } m_buffer = data; m_addr += 1; } WRITE8_MEMBER( sega315_5124_device::register_write ) { int reg_num; if (m_pending_reg_write == 0) { m_addr = (m_addr & 0xff00) | data; m_pending_reg_write = 1; } else { /* Clear pending write flag */ m_pending_reg_write = 0; m_addrmode = (data >> 6) & 0x03; m_addr = (data << 8) | (m_addr & 0xff); switch (m_addrmode) { case 0: /* VRAM reading mode */ m_buffer = this->space().read_byte(m_addr & 0x3fff); m_addr += 1; break; case 1: /* VRAM writing mode */ break; case 2: /* VDP register write */ reg_num = data & 0x0f; m_reg[reg_num] = m_addr & 0xff; //logerror("%s: %s: setting register %x to %02x\n", machine().describe_context(), tag(), reg_num, m_addr & 0xff); switch (reg_num) { case 0: set_display_settings(); if (m_addr & 0x02) logerror("overscan enabled.\n"); break; case 1: set_display_settings(); if (screen().hpos() <= DISPLAY_DISABLED_HPOS) m_display_disabled = !(m_reg[0x01] & 0x40); break; case 8: if (screen().hpos() <= XSCROLL_HPOS) m_reg8copy = m_reg[0x08]; } check_pending_flags(); if ( ( reg_num == 0 && (m_status & STATUS_HINT) ) || ( reg_num == 1 && (m_status & STATUS_VINT) ) ) { // For HINT disabling through register 00: // "Line IRQ VCount" test, of Flubba's VDPTest ROM, disables HINT to wait // for next VINT, but HINT occurs when the operation is about to execute. // So here, where the setting is done, the irq_state needs to be cleared. // // For VINT disabling through register 01: // When running eagles5 on the smskr driver the irq_state is 1 because of some // previos HINTs that occurred. eagles5 sets register 01 to 0x02 and expects // the irq state to be cleared after that. // The following bit of code takes care of that. // if ( ( reg_num == 0 && !(m_reg[0x00] & 0x10) ) || ( reg_num == 1 && !(m_reg[0x01] & 0x20) ) ) { if (m_irq_state == 1) { m_irq_state = 0; if ( !m_int_cb.isnull() ) { m_int_cb(CLEAR_LINE); } } } else { // For register 01 and VINT enabling: // Assert the IRQ line for the scoreboard of robocop3, // on the sms/smspal driver, be displayed correctly. // // Assume the same behavior for reg0+HINT. // m_irq_state = 1; if ( !m_int_cb.isnull() ) m_int_cb(ASSERT_LINE); } } m_addrmode = 0; break; case 3: /* CRAM writing mode */ break; } } } uint16_t sega315_5124_device::get_name_table_row(int row) { return ((row >> 3) << 6) & (((m_reg[0x02] & 0x01) << 10) | 0x3bff); } uint16_t sega315_5246_device::get_name_table_row(int row) { return (row >> 3) << 6; } uint16_t sega315_5378_device::get_name_table_row(int row) { return (row >> 3) << 6; } void sega315_5124_device::draw_scanline_mode4( int *line_buffer, int *priority_selected, int line ) { int tile_column; int y_scroll, scroll_mod; int pixel_x, pixel_plot_x; int bit_plane_0, bit_plane_1, bit_plane_2, bit_plane_3; uint16_t name_table_address; /* if top 2 rows of screen not affected by horizontal scrolling, then x_scroll = 0 */ /* else x_scroll = m_reg8copy */ const int x_scroll = (((m_reg[0x00] & 0x40) && (line < 16)) ? 0 : 0x0100 - m_reg8copy); const int x_scroll_start_column = (x_scroll >> 3); /* x starting column tile */ if ( m_y_pixels != 192 ) { name_table_address = ((m_reg[0x02] & 0x0c) << 10) | 0x0700; scroll_mod = 256; } else { name_table_address = (m_reg[0x02] << 10) & 0x3800; scroll_mod = 224; } /* Draw background layer */ for (tile_column = 0; tile_column < 33; tile_column++) { uint16_t tile_data; int tile_selected, palette_selected, horiz_selected, vert_selected, priority_select; int tile_line; /* Rightmost 8 columns for SMS (or 2 columns for GG) not affected by */ /* vertical scrolling when bit 7 of reg[0x00] is set */ y_scroll = ((m_reg[0x00] & 0x80) && (tile_column > 23)) ? 0 : m_reg9copy; tile_line = ((tile_column + x_scroll_start_column) & 0x1f) << 1; tile_data = space().read_word(name_table_address + get_name_table_row((line + y_scroll) % scroll_mod) + tile_line); tile_selected = (tile_data & 0x01ff); priority_select = tile_data & PRIORITY_BIT; palette_selected = (tile_data >> 11) & 0x01; vert_selected = (tile_data >> 10) & 0x01; horiz_selected = (tile_data >> 9) & 0x01; tile_line = line - ((0x07 - (y_scroll & 0x07)) + 1); if (vert_selected) tile_line = 0x07 - tile_line; bit_plane_0 = space().read_byte(((tile_selected << 5) + ((tile_line & 0x07) << 2)) + 0x00); bit_plane_1 = space().read_byte(((tile_selected << 5) + ((tile_line & 0x07) << 2)) + 0x01); bit_plane_2 = space().read_byte(((tile_selected << 5) + ((tile_line & 0x07) << 2)) + 0x02); bit_plane_3 = space().read_byte(((tile_selected << 5) + ((tile_line & 0x07) << 2)) + 0x03); for (pixel_x = 0; pixel_x < 8; pixel_x++) { uint8_t pen_bit_0, pen_bit_1, pen_bit_2, pen_bit_3; uint8_t pen_selected; pen_bit_0 = (bit_plane_0 >> (7 - pixel_x)) & 0x01; pen_bit_1 = (bit_plane_1 >> (7 - pixel_x)) & 0x01; pen_bit_2 = (bit_plane_2 >> (7 - pixel_x)) & 0x01; pen_bit_3 = (bit_plane_3 >> (7 - pixel_x)) & 0x01; pen_selected = (pen_bit_3 << 3 | pen_bit_2 << 2 | pen_bit_1 << 1 | pen_bit_0); if (palette_selected) pen_selected |= 0x10; if (!horiz_selected) { pixel_plot_x = pixel_x; } else { pixel_plot_x = 7 - pixel_x; } pixel_plot_x = (0 - (x_scroll & 0x07) + (tile_column << 3) + pixel_plot_x); if (pixel_plot_x >= 0 && pixel_plot_x < 256) { //logerror("%x %x\n", pixel_plot_x, line); if (tile_column == 0 && (x_scroll & 0x07)) { /* when the first column hasn't completely entered in the screen, its background is filled only with color #0 of the selected palette */ line_buffer[pixel_plot_x] = m_current_palette[palette_selected ? 0x10 : 0x00]; priority_selected[pixel_plot_x] = priority_select; } else { line_buffer[pixel_plot_x] = m_current_palette[pen_selected]; priority_selected[pixel_plot_x] = priority_select | (pen_selected & 0x0f); } } } } } void sega315_5124_device::select_sprites( int line ) { int max_sprites; /* At this point the VDP vcount still doesn't refer the new line, because the logical start point is slightly shifted on the scanline */ int parse_line = line - 1; /* Check if SI is set */ m_sprite_height = (m_reg[0x01] & 0x02) ? 16 : 8; /* Check if MAG is set */ m_sprite_zoom = (m_reg[0x01] & 0x01) ? 2 : 1; if (m_sprite_zoom > 1) { /* Divide before use the value for comparison, same later with sprite_y, or else an off-by-one bug could occur, as seen with Tarzan, for Game Gear */ parse_line >>= 1; } m_sprite_count = 0; if ( m_vdp_mode == 0 || m_vdp_mode == 2 ) { /* TMS9918 compatibility sprites */ max_sprites = 4; m_sprite_base = ((m_reg[0x05] & 0x7f) << 7); for (int sprite_index = 0; (sprite_index < 32 * 4) && (m_sprite_count <= max_sprites); sprite_index += 4) { int sprite_y = space().read_byte(m_sprite_base + sprite_index); if (sprite_y == 0xd0) break; if (sprite_y >= 240) { sprite_y -= 256; /* wrap from top if y position is >= 240 */ } if (m_sprite_zoom > 1) { sprite_y >>= 1; } if ((parse_line >= sprite_y) && (parse_line < (sprite_y + m_sprite_height))) { if (m_sprite_count < max_sprites) { int sprite_x = space().read_byte( m_sprite_base + sprite_index + 1 ); int sprite_tile_selected = space().read_byte( m_sprite_base + sprite_index + 2 ); uint8_t flags = space().read_byte( m_sprite_base + sprite_index + 3 ); int sprite_line = parse_line - sprite_y; if (m_sprite_height == 16) { sprite_tile_selected &= 0xfc; if (sprite_line > 0x07) { sprite_tile_selected += 1; sprite_line -= 8; } } m_sprite_x[m_sprite_count] = sprite_x; m_sprite_tile_selected[m_sprite_count] = sprite_tile_selected; m_sprite_flags[m_sprite_count] = flags; m_sprite_pattern_line[m_sprite_count] = ((m_reg[0x06] & 0x07) << 11) + sprite_line; } m_sprite_count++; } } } else { /* Regular sprites */ max_sprites = 8; m_sprite_base = ((m_reg[0x05] << 7) & 0x3f00); for (int sprite_index = 0; (sprite_index < 64) && (m_sprite_count <= max_sprites); sprite_index++) { int sprite_y = space().read_byte(m_sprite_base + sprite_index); if (m_y_pixels == 192 && sprite_y == 0xd0) break; if (sprite_y >= 240) { sprite_y -= 256; /* wrap from top if y position is >= 240 */ } if (m_sprite_zoom > 1) { sprite_y >>= 1; } if ((parse_line >= sprite_y) && (parse_line < (sprite_y + m_sprite_height))) { if (m_sprite_count < max_sprites) { int sprite_x = space().read_byte( m_sprite_base + 0x80 + (sprite_index << 1) ); int sprite_tile_selected = space().read_byte( m_sprite_base + 0x81 + (sprite_index << 1) ); if (m_reg[0x00] & 0x08) { sprite_x -= 0x08; /* sprite shift */ } if (m_reg[0x06] & 0x04) { sprite_tile_selected += 256; /* pattern table select */ } if (m_sprite_height == 16) { sprite_tile_selected &= 0x01fe; /* force even index */ } int sprite_line = parse_line - sprite_y; if (sprite_line > 0x07) { sprite_tile_selected += 1; } m_sprite_x[m_sprite_count] = sprite_x; m_sprite_tile_selected[m_sprite_count] = sprite_tile_selected; m_sprite_pattern_line[m_sprite_count] = ((sprite_line & 0x07) << 2); } m_sprite_count++; } } } if ( m_sprite_count > max_sprites ) { /* Too many sprites per line */ m_sprite_count = max_sprites; /* Overflow is flagged only on active display and when VINT isn't active */ if (!(m_status & STATUS_VINT) && line >= 0 && line < m_frame_timing[ACTIVE_DISPLAY_V]) { m_pending_status |= STATUS_SPROVR; } } } void sega315_5124_device::draw_sprites_mode4( int *line_buffer, int *priority_selected, int line ) { bool sprite_col_occurred = false; int sprite_col_x = 255; uint8_t collision_buffer[256]; int plot_min_x = 0; if (m_display_disabled || m_sprite_count == 0) return; /* Sprites aren't drawn and collisions don't occur on column 0 if it is disabled. Note: On Megadrive/Genesis VDP, collisions occur on the disabled column 0. */ if (m_reg[0x00] & 0x20) plot_min_x = 8; memset(collision_buffer, 0, sizeof(collision_buffer)); /* Draw sprite layer */ for (int sprite_buffer_index = m_sprite_count - 1; sprite_buffer_index >= 0; sprite_buffer_index--) { int sprite_x = m_sprite_x[sprite_buffer_index]; int sprite_tile_selected = m_sprite_tile_selected[sprite_buffer_index]; uint16_t sprite_pattern_line = m_sprite_pattern_line[sprite_buffer_index]; uint8_t bit_plane_0 = space().read_byte((sprite_tile_selected << 5) + sprite_pattern_line + 0x00); uint8_t bit_plane_1 = space().read_byte((sprite_tile_selected << 5) + sprite_pattern_line + 0x01); uint8_t bit_plane_2 = space().read_byte((sprite_tile_selected << 5) + sprite_pattern_line + 0x02); uint8_t bit_plane_3 = space().read_byte((sprite_tile_selected << 5) + sprite_pattern_line + 0x03); for (int pixel_x = 0; pixel_x < 8; pixel_x++) { int pixel_plot_x; uint8_t pen_bit_0 = (bit_plane_0 >> (7 - pixel_x)) & 0x01; uint8_t pen_bit_1 = (bit_plane_1 >> (7 - pixel_x)) & 0x01; uint8_t pen_bit_2 = (bit_plane_2 >> (7 - pixel_x)) & 0x01; uint8_t pen_bit_3 = (bit_plane_3 >> (7 - pixel_x)) & 0x01; uint8_t pen_selected = (pen_bit_3 << 3 | pen_bit_2 << 2 | pen_bit_1 << 1 | pen_bit_0) | 0x10; if (pen_selected == 0x10) { /* Transparent palette so skip draw */ continue; } if (m_sprite_zoom > 1) { /* sprite doubling is enabled */ pixel_plot_x = sprite_x + (pixel_x << 1); } else { pixel_plot_x = sprite_x + pixel_x; } /* Draw at pixel position and, if zoomed, at pixel+1 */ for (int zoom = 0; zoom < m_sprite_zoom; zoom++) { pixel_plot_x += zoom; /* check to prevent going outside of active display area */ if (pixel_plot_x < plot_min_x || pixel_plot_x > 255) { continue; } /* Draw sprite pixel */ /* Check if the background has lower priority */ if (!(priority_selected[pixel_plot_x] & PRIORITY_BIT)) { line_buffer[pixel_plot_x] = m_current_palette[pen_selected]; priority_selected[pixel_plot_x] = pen_selected; } else { /* Check if the higher priority background has transparent pixel */ if (priority_selected[pixel_plot_x] == PRIORITY_BIT) { line_buffer[pixel_plot_x] = m_current_palette[pen_selected]; priority_selected[pixel_plot_x] = pen_selected; } } if (collision_buffer[pixel_plot_x] != 1) { collision_buffer[pixel_plot_x] = 1; } else { sprite_col_occurred = true; sprite_col_x = std::min(sprite_col_x, pixel_plot_x); } } } if (sprite_col_occurred) { m_pending_status |= STATUS_SPRCOL; m_pending_sprcol_x = SPRCOL_BASEHPOS + sprite_col_x; } } } void sega315_5124_device::draw_sprites_tms9918_mode( int *line_buffer, int line ) { bool sprite_col_occurred = false; int sprite_col_x = 255; uint8_t collision_buffer[256]; if (m_display_disabled || m_sprite_count == 0) return; memset(collision_buffer, 0, sizeof(collision_buffer)); /* Draw sprite layer */ for (int sprite_buffer_index = m_sprite_count - 1; sprite_buffer_index >= 0; sprite_buffer_index--) { int sprite_x = m_sprite_x[sprite_buffer_index]; int sprite_tile_selected = m_sprite_tile_selected[sprite_buffer_index]; uint16_t sprite_pattern_line = m_sprite_pattern_line[sprite_buffer_index]; uint8_t flags = m_sprite_flags[sprite_buffer_index]; int pen_selected = m_palette_offset + ( flags & 0x0f ); if (flags & 0x80) sprite_x -= 32; for (int height = 8; height <= m_sprite_height; height += 8) { if (height == 16) { sprite_tile_selected += 2; sprite_x += (m_sprite_zoom > 1 ? 16 : 8); } uint8_t pattern = space().read_byte( sprite_pattern_line + sprite_tile_selected * 8 ); for (int pixel_x = 0; pixel_x < 8; pixel_x++) { if (pen_selected && (pattern & (1 << (7 - pixel_x)))) { int pixel_plot_x; if (m_sprite_zoom > 1) { pixel_plot_x = sprite_x + (pixel_x << 1); } else { pixel_plot_x = sprite_x + pixel_x; } /* Draw at pixel position and, if zoomed, at pixel+1 */ for (int zoom = 0; zoom < m_sprite_zoom; zoom++) { pixel_plot_x += zoom; /* check to prevent going outside of active display area */ if (pixel_plot_x < 0 || pixel_plot_x > 255) { continue; } line_buffer[pixel_plot_x] = m_current_palette[pen_selected]; if (collision_buffer[pixel_plot_x] != 1) { collision_buffer[pixel_plot_x] = 1; } else { sprite_col_occurred = true; sprite_col_x = std::min(sprite_col_x, pixel_plot_x); } } } } } if (sprite_col_occurred) { m_pending_status |= STATUS_SPRCOL; m_pending_sprcol_x = SPRCOL_BASEHPOS + sprite_col_x; } } } void sega315_5124_device::draw_scanline_mode2( int *line_buffer, int line ) { int tile_column; int pixel_x, pixel_plot_x; uint16_t name_table_base, color_base, pattern_base; int pattern_mask, color_mask, pattern_offset; name_table_base = ((m_reg[0x02] & 0x0f) << 10) + ((line >> 3) * 32); color_base = ((m_reg[0x03] & 0x80) << 6); color_mask = ((m_reg[0x03] & 0x7f) << 3) | 0x07; pattern_base = ((m_reg[0x04] & 0x04) << 11); pattern_mask = ((m_reg[0x04] & 0x03) << 8) | 0xff; pattern_offset = (line & 0xc0) << 2; /* Draw background layer */ for (tile_column = 0; tile_column < 32; tile_column++) { uint8_t name = space().read_byte( name_table_base + tile_column ); uint8_t pattern; uint8_t colors; pattern = space().read_byte(pattern_base + (((pattern_offset + name) & pattern_mask) * 8) + (line & 0x07) ); colors = space().read_byte(color_base + (((pattern_offset + name) & color_mask) * 8) + (line & 0x07) ); for (pixel_x = 0; pixel_x < 8; pixel_x++) { uint8_t pen_selected; if (pattern & (1 << (7 - pixel_x))) { pen_selected = colors >> 4; } else { pen_selected = colors & 0x0f; } if (!pen_selected) pen_selected = BACKDROP_COLOR; pixel_plot_x = (tile_column << 3) + pixel_x; pen_selected += m_palette_offset; line_buffer[pixel_plot_x] = m_current_palette[pen_selected]; } } } void sega315_5124_device::draw_scanline_mode0( int *line_buffer, int line ) { int tile_column; int pixel_x, pixel_plot_x; uint16_t name_base, color_base, pattern_base; name_base = ((m_reg[0x02] & 0x0f) << 10) + ((line >> 3) * 32); color_base = ((m_reg[0x03] << 6) & (VRAM_SIZE - 1)); pattern_base = ((m_reg[0x04] << 11) & (VRAM_SIZE - 1)); /* Draw background layer */ for (tile_column = 0; tile_column < 32; tile_column++) { uint8_t name = space().read_byte( name_base + tile_column ); uint8_t pattern; uint8_t colors; pattern = space().read_byte( pattern_base + (name * 8) + (line & 0x07) ); colors = space().read_byte( color_base + ( name >> 3 ) ); for (pixel_x = 0; pixel_x < 8; pixel_x++) { int pen_selected; if (pattern & (1 << (7 - pixel_x))) pen_selected = colors >> 4; else pen_selected = colors & 0x0f; pen_selected += m_palette_offset; pixel_plot_x = (tile_column << 3) + pixel_x; line_buffer[pixel_plot_x] = m_current_palette[pen_selected]; } } } void sega315_5124_device::draw_scanline( int pixel_offset_x, int pixel_plot_y, int line ) { int blitline_buffer[256]; int priority_selected[256]; /* Sprite processing is restricted because collisions on top border of extended resolution break the scoreboard of Fantasy Dizzy (SMS) on smspal driver */ if ( line < m_frame_timing[ACTIVE_DISPLAY_V] ) { memset(priority_selected, 1, sizeof(priority_selected)); switch( m_vdp_mode ) { case 0: if ( line >= 0 ) { draw_scanline_mode0( blitline_buffer, line ); } if ( line >= 0 || ( line >= -13 && m_y_pixels == 192 ) ) { draw_sprites_tms9918_mode( blitline_buffer, line ); } break; case 2: if ( line >= 0 ) { draw_scanline_mode2( blitline_buffer, line ); } if ( line >= 0 || ( line >= -13 && m_y_pixels == 192 ) ) { draw_sprites_tms9918_mode( blitline_buffer, line ); } break; case 4: default: if ( line >= 0 ) { draw_scanline_mode4( blitline_buffer, priority_selected, line ); } if ( line >= 0 || ( line >= -13 && m_y_pixels == 192 ) ) { draw_sprites_mode4( blitline_buffer, priority_selected, line ); } break; } } /* Check if display is disabled or we're below/above active area */ if (m_display_disabled || line < 0 || line >= m_frame_timing[ACTIVE_DISPLAY_V]) { rectangle rec; rec.min_y = rec.max_y = pixel_plot_y + line; rec.min_x = pixel_offset_x; rec.max_x = pixel_offset_x + 255; m_tmpbitmap.fill(m_palette->pen(m_current_palette[BACKDROP_COLOR]), rec); m_y1_bitmap.fill(( m_reg[0x07] & 0x0f ) ? 1 : 0, rec); } else { blit_scanline(blitline_buffer, priority_selected, pixel_offset_x, pixel_plot_y, line); } } void sega315_5124_device::blit_scanline( int *line_buffer, int *priority_selected, int pixel_offset_x, int pixel_plot_y, int line ) { uint32_t *p_bitmap = &m_tmpbitmap.pix32(pixel_plot_y + line, pixel_offset_x); uint8_t *p_y1 = &m_y1_bitmap.pix8(pixel_plot_y + line, pixel_offset_x); int x = 0; if (m_vdp_mode == 4 && (m_reg[0x00] & 0x20)) { /* Fill column 0 with overscan color from m_reg[0x07] */ do { p_bitmap[x] = m_palette->pen(m_current_palette[BACKDROP_COLOR]); p_y1[x] = ( m_reg[0x07] & 0x0f ) ? 1 : 0; } while(++x < 8); } do { p_bitmap[x] = m_palette->pen(line_buffer[x]); p_y1[x] = ( priority_selected[x] & 0x0f ) ? 1 : 0; } while(++x < 256); } void sega315_5378_device::blit_scanline( int *line_buffer, int *priority_selected, int pixel_offset_x, int pixel_plot_y, int line ) { if (m_sega315_5124_compatibility_mode) { sega315_5124_device::blit_scanline(line_buffer, priority_selected, pixel_offset_x, pixel_plot_y, line); } else { uint32_t *p_bitmap = &m_tmpbitmap.pix32(pixel_plot_y + line, pixel_offset_x); uint8_t *p_y1 = &m_y1_bitmap.pix8(pixel_plot_y + line, pixel_offset_x); int x = 0; /* border on left side of the GG active screen */ do { p_bitmap[x] = m_palette->pen(m_current_palette[BACKDROP_COLOR]); p_y1[x] = ( m_reg[0x07] & 0x0f ) ? 1 : 0; } while (++x < 48); if ( line >= 24 && line < 168 ) { do { p_bitmap[x] = m_palette->pen(line_buffer[x]); p_y1[x] = ( priority_selected[x] & 0x0f ) ? 1 : 0; } while (++x < 208); } else { /* top/bottom GG border */ do { p_bitmap[x] = m_palette->pen(m_current_palette[BACKDROP_COLOR]); p_y1[x] = ( m_reg[0x07] & 0x0f ) ? 1 : 0; } while (++x < 208); } /* border on right side of the GG active screen */ do { p_bitmap[x] = m_palette->pen(m_current_palette[BACKDROP_COLOR]); p_y1[x] = ( m_reg[0x07] & 0x0f ) ? 1 : 0; } while (++x < 256); } } void sega315_5124_device::update_palette() { int i; /* Exit if palette has no changes */ if (m_cram_dirty == 0) { return; } m_cram_dirty = 0; if (m_vdp_mode != 4) { for(i = 0; i < 16; i++) { m_current_palette[i] = 64 + i; } return; } for (i = 0; i < 32; i++) { m_current_palette[i] = m_CRAM[i] & 0x3f; } } void sega315_5378_device::update_palette() { int i; /* Exit if palette has no changes */ if (m_cram_dirty == 0) { return; } m_cram_dirty = 0; if (m_sega315_5124_compatibility_mode) { for (i = 0; i < 32; i++) { m_current_palette[i] = ((m_CRAM[i] & 0x30) << 6) | ((m_CRAM[i] & 0x0c ) << 4) | ((m_CRAM[i] & 0x03) << 2); } } else { for (i = 0; i < 32; i++) { m_current_palette[i] = (m_CRAM[2*i] | (m_CRAM[2*i+1] << 8)) & 0x0fff; } } } void sega315_5124_device::cram_write(uint8_t data) { uint16_t address = m_addr & m_cram_mask; if (data != m_CRAM[address]) { m_CRAM[address] = data; m_cram_dirty = 1; } } void sega315_5378_device::cram_write(uint8_t data) { if (m_sega315_5124_compatibility_mode) { sega315_5124_device::cram_write(data); } else { if (m_addr & 1) { uint16_t address = (m_addr & m_cram_mask) & ~1; if (m_buffer != m_CRAM[address] || data != m_CRAM[address + 1]) { m_CRAM[address] = m_buffer; m_CRAM[address + 1] = data; m_cram_dirty = 1; } } } } uint32_t sega315_5124_device::screen_update( screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect ) { copybitmap(bitmap, m_tmpbitmap, 0, 0, 0, 0, cliprect); return 0; } // MegaDrive/Genesis VDP (315-5313) is currently coded as superset of the 315-5124 // To support properly SMS VDP in MegaTech and MegaPlay, we start the 315-5124 // in all systems using MegaDrive/Genesis VDP, but this affects the performance // of the emulator hence we stop it in systems that don't need it // Proper way to handle this would be implement the 315-5124 modes in the 315-5313 // device instead of running the two chips separately... void sega315_5124_device::stop_timers() { m_display_timer->adjust(attotime::never); m_pending_flags_timer->adjust(attotime::never); m_hint_timer->adjust(attotime::never); m_vint_timer->adjust(attotime::never); m_nmi_timer->adjust(attotime::never); m_draw_timer->adjust(attotime::never); m_lborder_timer->adjust(attotime::never); m_rborder_timer->adjust(attotime::never); } /***************************************************************************** DEVICE INTERFACE *****************************************************************************/ void sega315_5124_device::vdp_postload() { set_frame_timing(); } void sega315_5124_device::device_start() { /* Resolve callbacks */ m_int_cb.resolve(); m_csync_cb.resolve(); m_pause_cb.resolve(); /* Allocate video RAM */ m_frame_timing = (m_is_pal) ? pal_192 : ntsc_192; /* Make temp bitmap for rendering */ screen().register_screen_bitmap(m_tmpbitmap); screen().register_screen_bitmap(m_y1_bitmap); m_display_timer = timer_alloc(TIMER_LINE); m_display_timer->adjust(screen().time_until_pos(0, DISPLAY_CB_HPOS), 0, screen().scan_period()); m_pending_flags_timer = timer_alloc(TIMER_FLAGS); m_pending_flags_timer->adjust(screen().time_until_pos(0, WIDTH - 1), 0, screen().scan_period()); m_draw_timer = timer_alloc(TIMER_DRAW); m_lborder_timer = timer_alloc(TIMER_LBORDER); m_rborder_timer = timer_alloc(TIMER_RBORDER); m_hint_timer = timer_alloc(TIMER_HINT); m_vint_timer = timer_alloc(TIMER_VINT); m_nmi_timer = timer_alloc(TIMER_NMI); save_item(NAME(m_status)); save_item(NAME(m_pending_status)); save_item(NAME(m_pending_sprcol_x)); save_item(NAME(m_reg8copy)); save_item(NAME(m_reg9copy)); save_item(NAME(m_addrmode)); save_item(NAME(m_addr)); save_item(NAME(m_cram_mask)); save_item(NAME(m_cram_dirty)); save_item(NAME(m_pending_reg_write)); save_item(NAME(m_buffer)); save_item(NAME(m_sega315_5124_compatibility_mode)); save_item(NAME(m_display_disabled)); save_item(NAME(m_irq_state)); save_item(NAME(m_vdp_mode)); save_item(NAME(m_y_pixels)); save_item(NAME(m_line_counter)); save_item(NAME(m_hcounter)); save_item(NAME(m_reg)); save_item(NAME(m_current_palette)); // these were created with register_screen_bitmap which is dynamic, and will reallocate if the screen size changes, saving them is NOT safe with the current core. // The Genesis VDP (315_5313.c) which uses this as a base in order to support the legacy SMS operaiton mode can change resolutions for example. //save_item(NAME(m_tmpbitmap)); //save_item(NAME(m_y1_bitmap)); save_item(NAME(m_draw_time)); save_item(NAME(m_sprite_base)); save_item(NAME(m_sprite_pattern_line)); save_item(NAME(m_sprite_tile_selected)); save_item(NAME(m_sprite_x)); save_item(NAME(m_sprite_flags)); save_item(NAME(m_sprite_count)); save_item(NAME(m_sprite_height)); save_item(NAME(m_sprite_zoom)); save_item(NAME(m_CRAM)); machine().save().register_postload(save_prepost_delegate(FUNC(sega315_5124_device::vdp_postload), this)); } void sega315_5124_device::device_reset() { int i; /* Most register are 0x00 at power-up */ for (i = 0; i < 16; i++) m_reg[i] = 0x00; m_reg[0x02] = 0x0e; m_reg[0x0a] = 0xff; m_status = 0; m_pending_status = 0; m_pending_sprcol_x = 0; m_pending_reg_write = 0; m_reg8copy = 0; m_reg9copy = 0; m_addrmode = 0; m_addr = 0; m_sega315_5124_compatibility_mode = false; m_display_disabled = false; m_cram_mask = m_cram_size - 1; m_cram_dirty = 1; m_buffer = 0; m_irq_state = 0; m_line_counter = 0; m_hcounter = 0; m_draw_time = DRAW_TIME_SMS; for (i = 0; i < 0x20; i++) m_current_palette[i] = 0; set_display_settings(); /* Clear RAM */ memset(m_CRAM, 0, sizeof(m_CRAM)); } //------------------------------------------------- // device_add_mconfig - add machine configuration //------------------------------------------------- MACHINE_CONFIG_START(sega315_5124_device::device_add_mconfig) MCFG_PALETTE_ADD("palette", SEGA315_5124_PALETTE_SIZE) MCFG_PALETTE_INIT_OWNER(sega315_5124_device, sega315_5124) MACHINE_CONFIG_END void sega315_5378_device::device_reset() { sega315_5124_device::device_reset(); m_draw_time = DRAW_TIME_GG; } //------------------------------------------------- // device_add_mconfig - add machine configuration //------------------------------------------------- MACHINE_CONFIG_START(sega315_5378_device::device_add_mconfig) MCFG_PALETTE_ADD("palette", SEGA315_5378_PALETTE_SIZE) MCFG_PALETTE_INIT_OWNER(sega315_5378_device, sega315_5378) MACHINE_CONFIG_END