summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/machine/sms.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/mame/machine/sms.cpp')
-rw-r--r--src/mame/machine/sms.cpp1581
1 files changed, 0 insertions, 1581 deletions
diff --git a/src/mame/machine/sms.cpp b/src/mame/machine/sms.cpp
deleted file mode 100644
index 343863cce4a..00000000000
--- a/src/mame/machine/sms.cpp
+++ /dev/null
@@ -1,1581 +0,0 @@
-// license:BSD-3-Clause
-// copyright-holders:Wilbert Pol, Charles MacDonald,Mathis Rosenhauer,Brad Oliver,Michael Luong,Fabio Priuli,Enik Land
-#include "emu.h"
-#include "crsshair.h"
-#include "cpu/z80/z80.h"
-#include "video/315_5124.h"
-#include "sound/ym2413.h"
-#include "includes/sms.h"
-
-#define VERBOSE 0
-#define LOG(x) do { if (VERBOSE) logerror x; } while (0)
-
-#define ENABLE_NONE 0x00
-#define ENABLE_EXPANSION 0x01
-#define ENABLE_CARD 0x02
-#define ENABLE_CART 0x04
-#define ENABLE_BIOS 0x08
-#define ENABLE_EXT_RAM 0x10
-
-
-TIMER_CALLBACK_MEMBER(sms_state::lphaser_th_generate)
-{
- m_vdp->hcount_latch();
-}
-
-
-void sms_state::lphaser_hcount_latch()
-{
- /* A delay seems to occur when the Light Phaser latches the
- VDP hcount, then an offset is added here to the hpos. */
- m_lphaser_th_timer->adjust(m_main_scr->time_until_pos(m_main_scr->vpos(), m_main_scr->hpos() + m_lphaser_x_offs));
-}
-
-
-WRITE_LINE_MEMBER(sms_state::sms_ctrl1_th_input)
-{
- // Check if TH of controller port 1 is set to input (1)
- if (m_io_ctrl_reg & 0x02)
- {
- if (state == 0)
- {
- m_ctrl1_th_latch = 1;
- }
- else
- {
- // State is 1. If changed from 0, hcount is latched.
- if (m_ctrl1_th_state == 0)
- lphaser_hcount_latch();
- }
- m_ctrl1_th_state = state;
- }
-}
-
-
-WRITE_LINE_MEMBER(sms_state::sms_ctrl2_th_input)
-{
- // Check if TH of controller port 2 is set to input (1)
- if (m_io_ctrl_reg & 0x08)
- {
- if (state == 0)
- {
- m_ctrl2_th_latch = 1;
- }
- else
- {
- // State is 1. If changed from 0, hcount is latched.
- if (m_ctrl2_th_state == 0)
- lphaser_hcount_latch();
- }
- m_ctrl2_th_state = state;
- }
-}
-
-
-WRITE_LINE_MEMBER(gamegear_state::gg_ext_th_input)
-{
- if (!(m_cartslot->exists() && m_cartslot->get_sms_mode()))
- return;
-
- // The EXT port act as the controller port 2 on SMS compatibility mode.
- sms_ctrl2_th_input(state);
-}
-
-
-void sms_state::sms_get_inputs()
-{
- uint8_t data1 = 0xff;
- uint8_t data2 = 0xff;
-
- m_port_dc_reg = 0xff;
- m_port_dd_reg = 0xff;
-
- // The bit order of the emulated controller port tries to follow its
- // physical pins numbering. For register bits whose order differs,
- // it's necessary move the equivalent controller bits to match.
-
- if (m_is_gamegear)
- {
- // For Game Gear, this function is used only if SMS mode is
- // enabled, else only register $dc receives input data, through
- // direct read of the m_port_gg_dc I/O port.
-
- data1 = m_port_gg_dc->read();
- m_port_dc_reg &= ~0x03f | data1;
-
- data2 = m_port_gg_ext->port_r();
- }
- else
- {
- data1 = m_port_ctrl1->port_r();
- m_port_dc_reg &= ~0x0f | data1; // Up, Down, Left, Right
- m_port_dc_reg &= ~0x10 | (data1 >> 1); // TL (Button 1)
- m_port_dc_reg &= ~0x20 | (data1 >> 2); // TR (Button 2)
-
- data2 = m_port_ctrl2->port_r();
- }
-
- m_port_dc_reg &= ~0xc0 | (data2 << 6); // Up, Down
- m_port_dd_reg &= ~0x03 | (data2 >> 2); // Left, Right
- m_port_dd_reg &= ~0x04 | (data2 >> 3); // TL (Button 1)
- m_port_dd_reg &= ~0x08 | (data2 >> 4); // TR (Button 2)
-
- if (!m_is_mark_iii)
- {
- m_port_dd_reg &= ~0x40 | data1; // TH ctrl1
- m_port_dd_reg &= ~0x80 | (data2 << 1); // TH ctrl2
- }
-}
-
-
-WRITE8_MEMBER(sms_state::sms_io_control_w)
-{
- bool latch_hcount = false;
- uint8_t ctrl1_port_data = 0xff;
- uint8_t ctrl2_port_data = 0xff;
-
- if (m_is_gamegear && !(m_cartslot->exists() && m_cartslot->get_sms_mode()))
- {
- m_io_ctrl_reg = data;
- return;
- }
-
- // Controller Port 1:
-
- // check if TR or TH are set to output (0).
- if ((data & 0x03) != 0x03)
- {
- if (!(data & 0x01)) // TR set to output
- {
- ctrl1_port_data &= ~0x80 | (data << 3);
- }
- if (!(data & 0x02)) // TH set to output
- {
- ctrl1_port_data &= ~0x40 | (data << 1);
- }
- if (!m_is_gamegear)
- m_port_ctrl1->port_w(ctrl1_port_data);
- }
- // check if TH is set to input (1).
- if (data & 0x02)
- {
- if (!m_is_gamegear)
- ctrl1_port_data &= ~0x40 | m_port_ctrl1->port_r();
-
- // check if TH input level is high (1) and was output/low (0)
- if ((ctrl1_port_data & 0x40) && !(m_io_ctrl_reg & 0x22))
- latch_hcount = true;
- }
-
- // Controller Port 2:
-
- // check if TR or TH are set to output (0).
- if ((data & 0x0c) != 0x0c)
- {
- if (!(data & 0x04)) // TR set to output
- {
- ctrl2_port_data &= ~0x80 | (data << 1);
- }
- if (!(data & 0x08)) // TH set to output
- {
- ctrl2_port_data &= ~0x40 | (data >> 1);
- }
- if (!m_is_gamegear)
- m_port_ctrl2->port_w(ctrl2_port_data);
- else
- m_port_gg_ext->port_w(ctrl2_port_data);
- }
- // check if TH is set to input (1).
- if (data & 0x08)
- {
- if (!m_is_gamegear)
- ctrl2_port_data &= ~0x40 | m_port_ctrl2->port_r();
- else
- ctrl2_port_data &= ~0x40 | m_port_gg_ext->port_r();
-
- // check if TH input level is high (1) and was output/low (0)
- if ((ctrl2_port_data & 0x40) && !(m_io_ctrl_reg & 0x88))
- latch_hcount = true;
- }
-
- if (latch_hcount)
- {
- m_vdp->hcount_latch();
- }
- m_io_ctrl_reg = data;
-}
-
-
-READ8_MEMBER(sms_state::sms_count_r)
-{
- if (offset & 0x01)
- return m_vdp->hcount_read();
- else
- return m_vdp->vcount_read();
-}
-
-
-/*
- If the gamegear is in sms mode, the start button performs the pause function.
- */
-WRITE_LINE_MEMBER(gamegear_state::gg_pause_callback)
-{
- if (!state)
- {
- bool pause_pressed = false;
-
- if (m_cartslot->exists() && m_cartslot->get_sms_mode())
- {
- if (!(m_port_start->read() & 0x80))
- pause_pressed = true;
- }
-
- if (pause_pressed)
- {
- if (!m_gg_paused)
- m_maincpu->set_input_line(INPUT_LINE_NMI, ASSERT_LINE);
-
- m_gg_paused = 1;
- }
- else
- {
- if (m_gg_paused)
- m_maincpu->set_input_line(INPUT_LINE_NMI, CLEAR_LINE);
-
- m_gg_paused = 0;
- }
- }
-}
-
-
-WRITE_LINE_MEMBER(sms_state::rapid_n_csync_callback)
-{
- if (m_port_rapid.found())
- {
- uint8_t rapid_previous_mode = m_rapid_mode;
-
- m_csync_counter++;
- // counter is 12 bits wide (for 4096 pulses)
- m_csync_counter &= 0xfff;
-
- if (!(m_port_rapid->read() & 0x01)) // Rapid button is pressed
- {
- sms_get_inputs();
-
- if (m_port_dc_reg != m_rapid_last_dc)
- {
- // Enable/disable rapid fire for any joypad button pressed.
- m_rapid_mode ^= (~m_port_dc_reg & 0x30) >> 4;
- m_rapid_last_dc = m_port_dc_reg;
- }
- if (m_port_dd_reg != m_rapid_last_dd)
- {
- // Enable/disable rapid fire for any joypad button pressed.
- m_rapid_mode ^= (~m_port_dd_reg & 0x0c);
- m_rapid_last_dd = m_port_dd_reg;
- }
- }
- else // Rapid button is not pressed
- {
- m_rapid_last_dc = 0xff;
- m_rapid_last_dd = 0xff;
- }
-
- if ((m_rapid_mode & 0x0f) != 0) // Rapid Fire enabled for a button
- {
- // Timings for Rapid Fire and LED verified by Charles MacDonald.
-
- // Read state is probably changed at each 256 C-Sync pulses
- if ((m_csync_counter & 0xff) == 0)
- {
- m_rapid_read_state ^= 0xff;
- }
-
- // Power LED blinks while Rapid Fire is enabled.
- // It switches between on/off at each 2048 C-Sync pulses.
- if ((m_csync_counter & 0x7ff) == 0 && m_has_pwr_led)
- {
- m_led_pwr = !m_led_pwr;
- }
- }
- else // Rapid Fire disabled
- {
- if ((rapid_previous_mode & 0x0f) != 0) // it was enabled
- {
- m_rapid_read_state = 0x00;
- // Power LED remains lit again
- if (m_has_pwr_led)
- m_led_pwr = 1;
- }
- }
- }
-}
-
-
-READ8_MEMBER(sms_state::sms_input_port_dc_r)
-{
- if (m_is_mark_iii)
- {
- sms_get_inputs();
- return m_port_dc_reg;
- }
-
- if (m_is_gamegear)
- {
- // If SMS mode is disabled, just return the data read from the
- // input port. Its mapped port bits match the bits of register $dc.
- if (!(m_cartslot->exists() && m_cartslot->get_sms_mode()))
- return m_port_gg_dc->read();
- }
- else
- {
- // Return if the I/O chip is disabled (1). This check isn't performed
- // for the Game Gear because has no effect on it, even in SMS mode.
- if (m_mem_ctrl_reg & IO_CHIP)
- return 0xff;
- }
-
- sms_get_inputs();
-
- // Check if TR of controller port 1 is set to output (0)
- if (!(m_io_ctrl_reg & 0x01))
- {
- // Read TR state set through IO control port
- m_port_dc_reg &= ~0x20 | ((m_io_ctrl_reg & 0x10) << 1);
- }
-
- if (m_port_rapid.found())
- {
- // Check if Rapid Fire is enabled for Button 1
- if (m_rapid_mode & 0x01)
- m_port_dc_reg |= m_rapid_read_state & 0x10;
-
- // Check if Rapid Fire is enabled for Button 2
- if (m_rapid_mode & 0x02)
- m_port_dc_reg |= m_rapid_read_state & 0x20;
- }
-
- return m_port_dc_reg;
-}
-
-
-READ8_MEMBER(sms_state::sms_input_port_dd_r)
-{
- if (m_is_mark_iii)
- {
- sms_get_inputs();
- return m_port_dd_reg;
- }
-
- if (m_is_gamegear)
- {
- if (!(m_cartslot->exists() && m_cartslot->get_sms_mode()))
- return 0xff;
- }
- else
- {
- // Return if the I/O chip is disabled (1). This check isn't performed
- // for the Game Gear because has no effect on it, even in SMS mode.
- if (m_mem_ctrl_reg & IO_CHIP)
- return 0xff;
- }
-
- sms_get_inputs();
-
- // Check if TR of controller port 2 is set to output (0)
- if (!(m_io_ctrl_reg & 0x04))
- {
- // Read TR state set through IO control port
- m_port_dd_reg &= ~0x08 | ((m_io_ctrl_reg & 0x40) >> 3);
- }
-
- // Reset Button
- if (m_port_reset.found())
- {
- m_port_dd_reg &= ~0x10 | (m_port_reset->read() & 0x01) << 4;
- }
-
- // Check if TH of controller port 1 is set to output (0)
- if (!(m_io_ctrl_reg & 0x02))
- {
- if (m_ioctrl_region_is_japan)
- {
- m_port_dd_reg &= ~0x40;
- }
- else
- {
- // Read TH state set through IO control port
- m_port_dd_reg &= ~0x40 | ((m_io_ctrl_reg & 0x20) << 1);
- }
- }
- else // TH set to input (1)
- {
- if (m_ctrl1_th_latch)
- {
- if (m_vdp->hcount_latched())
- m_port_dd_reg &= ~0x40;
-
- m_ctrl1_th_latch = 0;
- }
- }
-
- // Check if TH of controller port 2 is set to output (0)
- if (!(m_io_ctrl_reg & 0x08))
- {
- if (m_ioctrl_region_is_japan)
- {
- m_port_dd_reg &= ~0x80;
- }
- else
- {
- // Read TH state set through IO control port
- m_port_dd_reg &= ~0x80 | (m_io_ctrl_reg & 0x80);
- }
- }
- else // TH set to input (1)
- {
- if (m_ctrl2_th_latch)
- {
- if (m_vdp->hcount_latched())
- m_port_dd_reg &= ~0x80;
-
- m_ctrl2_th_latch = 0;
- }
- }
-
- if (m_port_rapid.found())
- {
- // Check if Rapid Fire is enabled for Button 1
- if (m_rapid_mode & 0x04)
- m_port_dd_reg |= m_rapid_read_state & 0x04;
-
- // Check if Rapid Fire is enabled for Button 2
- if (m_rapid_mode & 0x08)
- m_port_dd_reg |= m_rapid_read_state & 0x08;
- }
-
- return m_port_dd_reg;
-}
-
-
-void sms_state::smsj_set_audio_control(uint8_t data)
-{
- m_smsj_audio_control = data & 0x03;
-
- /* Mute settings:
- 0,0 : PSG only (power-on default)
- 0,1 : FM only
- 1,0 : Both PSG and FM disabled
- 1,1 : Both PSG and FM enabled
- */
- if (m_smsj_audio_control == 0x00 || m_smsj_audio_control == 0x03)
- m_vdp->set_output_gain(ALL_OUTPUTS, 1.0);
- else
- m_vdp->set_output_gain(ALL_OUTPUTS, 0.0);
-
- if (m_smsj_audio_control == 0x01 || m_smsj_audio_control == 0x03)
- m_ym->set_output_gain(ALL_OUTPUTS, 1.0);
- else
- m_ym->set_output_gain(ALL_OUTPUTS, 0.0);
-}
-
-
-WRITE8_MEMBER(sms_state::smsj_audio_control_w)
-{
- smsj_set_audio_control(data);
-}
-
-
-READ8_MEMBER(sms_state::smsj_audio_control_r)
-{
- uint8_t data;
-
- /* Charles MacDonald discovered an internal 12-bit counter that is
- incremented on each pulse of the C-Sync line that connects the VDP
- with the 315-5297. Only 3 bits of the counter are returned when
- read this port:
-
- D7 : Counter bit 11
- D6 : Counter bit 7
- D5 : Counter bit 3
- D4 : Always zero
- D3 : Always zero
- D2 : Always zero
- D1 : Mute control bit 1
- D0 : Mute control bit 0
-
- */
- data = 0x00;
- data |= (m_smsj_audio_control & 0x03);
- data |= (m_csync_counter & 0x008) << 2;
- data |= (m_csync_counter & 0x080) >> 1;
- data |= (m_csync_counter & 0x800) >> 4;
-
- return data;
-}
-
-
-WRITE8_MEMBER(sms_state::smsj_ym2413_register_port_w)
-{
- m_ym->write(0, data & 0x3f);
-}
-
-
-WRITE8_MEMBER(sms_state::smsj_ym2413_data_port_w)
-{
- //logerror("data_port_w %x %x\n", offset, data);
- m_ym->write(1, data);
-}
-
-
-WRITE8_MEMBER(gamegear_state::gg_psg_stereo_w)
-{
- if (m_cartslot->exists() && m_cartslot->get_sms_mode())
- return;
-
- m_vdp->psg_stereo_w(data);
-}
-
-
-READ8_MEMBER(gamegear_state::gg_input_port_00_r)
-{
- if (m_cartslot->exists() && m_cartslot->get_sms_mode())
- return 0xff;
- else
- {
- // bit 6 is NJAP (0=domestic/1=overseas); bit 7 is STT (START button)
- uint8_t data = (m_ioctrl_region_is_japan ? 0x00 : 0x40) | (m_port_start->read() & 0x80);
-
- // According to GG official docs, bits 0-4 are meaningless and bit 5
- // is NNTS (0=NTSC, 1=PAL). All games run in NTSC and no original GG
- // allows the user to change that mode, but there are NTSC and PAL
- // versions of the TV Tuner.
-
- //logerror("port $00 read, val: %02x, pc: %04x\n", data, activecpu_get_pc());
- return data;
- }
-}
-
-
-READ8_MEMBER(sms1_state::sscope_r)
-{
- int sscope = m_port_scope->read();
-
- // On SMSJ, address $fffb also controls the built-in 3-D port, that works
- // in parallel with the 3-D adapter that is inserted into the card slot.
-
- if ( sscope )
- {
- // Scope is attached
- return m_sscope_state;
- }
-
- return read_ram(space, 0x3ff8 + offset);
-}
-
-
-WRITE8_MEMBER(sms1_state::sscope_w)
-{
- write_ram(space, 0x3ff8 + offset, data);
-
- int sscope = m_port_scope->read();
-
- if ( sscope )
- {
- // Scope is attached
- m_sscope_state = data;
-
- // There are occurrences when Sega Scope's state changes after VBLANK, or at
- // active screen. Most cases are solid-color frames of scene transitions, but
- // one exception is the first frame of Zaxxon 3-D's title screen. In that
- // case, this method is enough for setting the intended state for the frame.
- // According to Charles MacDonald: "It takes around 10 scanlines for the
- // display to transition from fully visible to fully obscured by the shutter".
- if (m_main_scr->vpos() < (m_main_scr->height() >> 1))
- {
- m_frame_sscope_state = m_sscope_state;
- }
- }
-}
-
-
-READ8_MEMBER(sms_state::read_ram)
-{
- if (m_mem_device_enabled & ENABLE_EXT_RAM)
- {
- uint8_t data = 0xff;
-
- if (m_mem_device_enabled & ENABLE_CART)
- data &= m_cartslot->read_ram(space, offset);
- if (m_mem_device_enabled & ENABLE_CARD)
- data &= m_cardslot->read_ram(space, offset);
- if (m_mem_device_enabled & ENABLE_EXPANSION)
- data &= m_smsexpslot->read_ram(space, offset);
-
- return data;
- }
- else
- {
- return m_mainram[offset & 0x1fff];
- }
-}
-
-
-WRITE8_MEMBER(sms_state::write_ram)
-{
- if (m_mem_device_enabled & ENABLE_EXT_RAM)
- {
- if (m_mem_device_enabled & ENABLE_CART)
- m_cartslot->write_ram(space, offset, data);
- if (m_mem_device_enabled & ENABLE_CARD)
- m_cardslot->write_ram(space, offset, data);
- if (m_mem_device_enabled & ENABLE_EXPANSION)
- m_smsexpslot->write_ram(space, offset, data);
- }
- else
- {
- m_mainram[offset & 0x1fff] = data;
- }
-}
-
-
-READ8_MEMBER(sms_state::sms_mapper_r)
-{
- return read_ram(space, 0x3ffc + offset);
-}
-
-
-WRITE8_MEMBER(sms_state::sms_mapper_w)
-{
- m_mapper[offset] = data;
- write_ram(space, 0x3ffc + offset, data);
-
- switch (offset)
- {
- case 0: // Control RAM/ROM
- if (!(data & 0x08) && (m_mem_device_enabled & ENABLE_BIOS)) // BIOS ROM
- {
- if (!m_has_bios_0400 && !m_has_bios_2000)
- {
- m_bios_page[2] = m_mapper[3];
- }
- }
- if (m_mem_device_enabled & ENABLE_CART) // CART ROM/RAM
- {
- m_cartslot->write_mapper(space, offset, data);
- }
- if (m_mem_device_enabled & ENABLE_CARD) // CARD ROM/RAM
- {
- m_cardslot->write_mapper(space, offset, data);
- }
- if (m_mem_device_enabled & ENABLE_EXPANSION) // expansion slot
- {
- m_smsexpslot->write_mapper(space, offset, data);
- }
- break;
-
- case 1: // Select 16k ROM bank for 0400-3fff
- case 2: // Select 16k ROM bank for 4000-7fff
- case 3: // Select 16k ROM bank for 8000-bfff
- if (m_mem_device_enabled & ENABLE_BIOS)
- {
- if (!m_has_bios_0400 && !m_has_bios_2000)
- {
- m_bios_page[offset - 1] = data & (m_bios_page_count - 1);
- }
- }
- if (m_mem_device_enabled & ENABLE_CART)
- {
- m_cartslot->write_mapper(space, offset, data);
- }
- if (m_mem_device_enabled & ENABLE_CARD)
- {
- m_cardslot->write_mapper(space, offset, data);
- }
- if (m_mem_device_enabled & ENABLE_EXPANSION)
- {
- m_smsexpslot->write_mapper(space, offset, data);
- }
- break;
- }
-}
-
-
-uint8_t sms_state::read_bus(address_space &space, unsigned int page, uint16_t base_addr, uint16_t offset)
-{
- if (m_is_gamegear)
- {
- // Game Gear BIOS behavior, according to Charles MacDonald: "it uses the first
- // 1K. The rest of the space is mapped to the cartridge, regardless of the slot
- // that's selected. This allows the BIOS to check for the 'TMR SEGA' string at
- // 1FF0/3FF0/7FF0, but it can't do a checksum since the first 1K of ROM is
- // unavailable. Anyway, once the BIOS decides to run the game, it disables
- // itself, and the first 1K is assigned to the cartridge ROM like normal."
-
- if ((m_mem_device_enabled & ENABLE_BIOS) && page == 3)
- return m_BIOS[(m_bios_page[page] * 0x4000) + (offset & 0x3fff)];
- if (m_mem_device_enabled & ENABLE_CART)
- return m_cartslot->read_cart(space, base_addr + offset);
- }
- else if (m_mem_device_enabled != ENABLE_NONE)
- {
- uint8_t data = 0xff;
-
- // SMS2 behavior described by Charles MacDonald's SMS notes:
- // "If the BIOS is enabled at the same time the cartridge slot is,
- // the data from both sources are logically ANDed together when read."
-
- if (m_mem_device_enabled & ENABLE_BIOS)
- data &= m_BIOS[(m_bios_page[page] * 0x4000) + (offset & 0x3fff)];
- if (m_mem_device_enabled & ENABLE_CART)
- data &= m_cartslot->read_cart(space, base_addr + offset);
- if (m_mem_device_enabled & ENABLE_CARD)
- data &= m_cardslot->read_cart(space, base_addr + offset);
- if (m_mem_device_enabled & ENABLE_EXPANSION)
- data &= m_smsexpslot->read(space, base_addr + offset);
-
- return data;
- }
- return m_region_maincpu->base()[offset];
-}
-
-
-READ8_MEMBER(sms_state::read_0000)
-{
- if (offset < 0x400)
- {
- return read_bus(space, 3, 0x0000, offset);
- }
- else
- {
- return read_bus(space, 0, 0x0000, offset);
- }
-}
-
-READ8_MEMBER(sms_state::read_4000)
-{
- return read_bus(space, 1, 0x4000, offset);
-}
-
-READ8_MEMBER(sms_state::read_8000)
-{
- return read_bus(space, 2, 0x8000, offset);
-}
-
-WRITE8_MEMBER(sms_state::write_cart)
-{
- if (m_mem_device_enabled & ENABLE_CART)
- m_cartslot->write_cart(space, offset, data);
- if (m_mem_device_enabled & ENABLE_CARD)
- m_cardslot->write_cart(space, offset, data);
- if (m_mem_device_enabled & ENABLE_EXPANSION)
- m_smsexpslot->write(space, offset, data);
-}
-
-
-READ8_MEMBER(smssdisp_state::store_cart_peek)
-{
- if (m_mem_device_enabled != ENABLE_NONE)
- {
- uint8_t data = 0xff;
-
- if (m_mem_device_enabled & ENABLE_CART)
- data &= m_cartslot->read_cart(space, 0x6000 + (offset & 0x1fff));
-
- return data;
- }
- else
- {
- return m_region_maincpu->base()[offset];
- }
-}
-
-WRITE8_MEMBER(sms_state::sms_mem_control_w)
-{
- m_mem_ctrl_reg = data;
-
- logerror("%s memory control reg write %02x\n", machine().describe_context(), data);
-
- setup_media_slots();
-}
-
-
-READ8_MEMBER(sms_state::sg1000m3_peripheral_r)
-{
- bool joy_ports_disabled = m_sgexpslot->is_readable(offset);
-
- if (joy_ports_disabled)
- {
- return m_sgexpslot->read(space, offset);
- }
- else
- {
- if (offset & 0x01)
- return sms_input_port_dd_r(space, offset);
- else
- return sms_input_port_dc_r(space, offset);
- }
-}
-
-
-WRITE8_MEMBER(sms_state::sg1000m3_peripheral_w)
-{
- bool joy_ports_disabled = m_sgexpslot->is_writeable(offset);
-
- if (joy_ports_disabled)
- {
- m_sgexpslot->write(space, offset, data);
- }
-}
-
-
-WRITE8_MEMBER(gamegear_state::gg_sio_w)
-{
- if (m_cartslot->exists() && m_cartslot->get_sms_mode())
- return;
-
- logerror("*** write %02X to SIO register #%d\n", data, offset);
-
- m_gg_sio[offset & 0x07] = data;
- switch (offset & 7)
- {
- case 0x00: /* Parallel Data */
- break;
-
- case 0x01: /* Data Direction / NMI Enable */
- break;
-
- case 0x02: /* Serial Output */
- break;
-
- case 0x03: /* Serial Input */
- break;
-
- case 0x04: /* Serial Control / Status */
- break;
- }
-}
-
-
-READ8_MEMBER(gamegear_state::gg_sio_r)
-{
- if (m_cartslot->exists() && m_cartslot->get_sms_mode())
- return 0xff;
-
- logerror("*** read SIO register #%d\n", offset);
-
- switch (offset & 7)
- {
- case 0x00: /* Parallel Data */
- break;
-
- case 0x01: /* Data Direction / NMI Enable */
- break;
-
- case 0x02: /* Serial Output */
- break;
-
- case 0x03: /* Serial Input */
- break;
-
- case 0x04: /* Serial Control / Status */
- break;
- }
-
- return m_gg_sio[offset];
-}
-
-
-void sms_state::setup_enabled_slots()
-{
- m_mem_device_enabled = ENABLE_NONE;
-
- if (m_is_mark_iii)
- {
- // Mark III uses the card slot by default, but has hardware method
- // (/CART pin) that prioritizes the cartridge slot if it has media
- // inserted. Japanese 3-D cartridges do not connect the /CART pin,
- // to not disable the card adaptor used by the 3-D glasses.
- if (m_cartslot && m_cartslot->exists())
- {
- m_mem_device_enabled |= ENABLE_CART;
- logerror("Cartridge ROM/RAM enabled.\n");
- }
- else if (m_cardslot && m_cardslot->exists())
- {
- m_mem_device_enabled |= ENABLE_CARD;
- logerror("Card ROM port enabled.\n");
- }
- return;
- }
-
- if (!(m_mem_ctrl_reg & IO_EXPANSION) && m_smsexpslot && m_smsexpslot->device_present())
- {
- m_mem_device_enabled |= ENABLE_EXPANSION;
- logerror("Expansion port enabled.\n");
- }
-
- if (!(m_mem_ctrl_reg & IO_CARD) && m_cardslot && m_cardslot->exists())
- {
- m_mem_device_enabled |= ENABLE_CARD;
- logerror("Card ROM port enabled.\n");
- }
-
- if ((m_is_gamegear || !(m_mem_ctrl_reg & IO_CARTRIDGE)) && m_cartslot && m_cartslot->exists())
- {
- m_mem_device_enabled |= ENABLE_CART;
- logerror("Cartridge ROM/RAM enabled.\n");
- }
-
- if (!(m_mem_ctrl_reg & IO_BIOS_ROM) && m_BIOS)
- {
- m_mem_device_enabled |= ENABLE_BIOS;
- logerror("BIOS enabled.\n");
- }
-}
-
-
-void sms_state::setup_media_slots()
-{
- setup_enabled_slots();
-
- if (m_mem_device_enabled == ENABLE_NONE)
- return;
-
- // Setup cartridge RAM
- if (!m_is_mark_iii && (m_mem_ctrl_reg & IO_WORK_RAM)) // Work RAM disabled (1).
- {
- m_mem_device_enabled |= ENABLE_EXT_RAM;
- }
- else if (m_has_jpn_sms_cart_slot && (m_mem_device_enabled & ENABLE_CART))
- {
- // a bunch of SG1000 carts (compatible with SG1000 Mark III) use their own RAM...
- // TODO: are BASIC and Music actually compatible with Mark III??
- if (m_cartslot->get_type() == SEGA8_BASIC_L3 ||
- m_cartslot->get_type() == SEGA8_MUSIC_EDITOR ||
- m_cartslot->get_type() == SEGA8_DAHJEE_TYPEA ||
- m_cartslot->get_type() == SEGA8_DAHJEE_TYPEB ||
- m_cartslot->get_type() == SEGA8_SEOJIN)
- {
- m_mem_device_enabled |= ENABLE_EXT_RAM;
- }
- }
-
- // Set offset for Light Phaser
- if (!m_is_mark_iii)
- {
- m_lphaser_x_offs = -1; // same value returned for ROMs without custom offset.
-
- if (m_mem_device_enabled & ENABLE_CART)
- m_lphaser_x_offs = m_cartslot->get_lphaser_xoffs();
- else if (m_mem_device_enabled & ENABLE_CARD)
- m_lphaser_x_offs = m_cardslot->get_lphaser_xoffs();
- else if (m_mem_device_enabled & ENABLE_EXPANSION)
- m_lphaser_x_offs = m_smsexpslot->get_lphaser_xoffs();
-
- if (m_lphaser_x_offs == -1)
- m_lphaser_x_offs = 19;
- }
-}
-
-
-void sms_state::setup_bios()
-{
- if (memregion("user1") != nullptr)
- {
- m_BIOS = memregion("user1")->base();
- m_bios_page_count = (m_BIOS ? memregion("user1")->bytes() / 0x4000 : 0);
- }
-
- if (m_BIOS == nullptr || m_BIOS[0] == 0x00)
- {
- m_BIOS = nullptr;
- m_has_bios_0400 = false;
- m_has_bios_2000 = false;
- m_has_bios_full = false;
- }
-
- if (m_BIOS)
- {
- m_bios_page[3] = 0;
- m_bios_page[0] = 0;
- m_bios_page[1] = (1 < m_bios_page_count) ? 1 : 0;
- m_bios_page[2] = (2 < m_bios_page_count) ? 2 : 0;
- }
-
- if (!m_is_mark_iii)
- {
- m_mem_ctrl_reg = (IO_EXPANSION | IO_CARTRIDGE | IO_CARD);
- if (!m_BIOS)
- {
- m_mem_ctrl_reg &= ~(IO_CARTRIDGE);
- m_mem_ctrl_reg |= IO_BIOS_ROM;
- }
- }
-}
-
-void sms_state::machine_start()
-{
- // turn on the Power LED
- if (m_has_pwr_led)
- {
- m_led_pwr.resolve();
- m_led_pwr = 1;
- }
-
- m_cartslot = m_slot.target();
- m_space = &m_maincpu->space(AS_PROGRAM);
-
- if (m_mainram == nullptr)
- {
- m_mainram = make_unique_clear<uint8_t[]>(0x2000);
- save_pointer(NAME(m_mainram), 0x2000);
-
- // alibaba and blockhol are ports of games for the MSX system. The
- // MSX bios usually initializes callback "vectors" at the top of RAM.
- // The code in alibaba does not do this so the IRQ vector only contains
- // the "call $4010" without a following RET statement. That is basically
- // a bug in the program code. The only way this cartridge could have run
- // successfully on a real unit is if the RAM would be initialized with
- // a F0 pattern on power up; F0 = RET P.
- // This initialization breaks some Game Gear games though (e.g.
- // tempojr), suggesting that not all systems had the same initialization.
- // This also breaks some homebrew software (e.g. Nine Pixels).
- // For the moment we apply this to systems that have the Japanese SMS
- // cartridge slot.
- if (m_has_jpn_sms_cart_slot)
- {
- memset(m_mainram.get(), 0xf0, 0x2000);
- }
- }
-
- m_lphaser_th_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(sms_state::lphaser_th_generate),this));
-
- save_item(NAME(m_mapper));
- save_item(NAME(m_port_dc_reg));
- save_item(NAME(m_port_dd_reg));
- save_item(NAME(m_mem_device_enabled));
-
- if (m_is_smsj)
- {
- save_item(NAME(m_smsj_audio_control));
- }
-
- if (m_port_rapid.found())
- {
- save_item(NAME(m_csync_counter));
- save_item(NAME(m_rapid_mode));
- save_item(NAME(m_rapid_read_state));
- save_item(NAME(m_rapid_last_dc));
- save_item(NAME(m_rapid_last_dd));
- }
-
- if (!m_is_mark_iii)
- {
- save_item(NAME(m_mem_ctrl_reg));
- save_item(NAME(m_bios_page));
- save_item(NAME(m_io_ctrl_reg));
- save_item(NAME(m_ctrl1_th_latch));
- save_item(NAME(m_ctrl2_th_latch));
- save_item(NAME(m_ctrl1_th_state));
- save_item(NAME(m_ctrl2_th_state));
- save_item(NAME(m_lphaser_x_offs));
- }
-
- if (m_cartslot)
- m_cartslot->save_ram();
-}
-
-void smssdisp_state::machine_start()
-{
- sms_state::machine_start();
-
- save_item(NAME(m_store_control));
- save_item(NAME(m_store_cart_selection_data));
-}
-
-void gamegear_state::machine_start()
-{
- sms_state::machine_start();
-
- save_item(NAME(m_gg_paused));
- save_item(NAME(m_gg_sio));
-
- // The game Ecco requires SP to be initialized, so, to run on a BIOS-less Game
- // Gear, probably a custom chip like the 315-5378 does the initialization, as
- // done by the 315-5342 chip on the Power Base Converter for Sega Genesis/MD.
- // Reference: http://www.smspower.org/forums/14084-PowerBaseConverterInfo
- m_maincpu->set_state_int(Z80_SP, 0xdff0);
-}
-
-void sms_state::machine_reset()
-{
- if (m_is_smsj)
- {
- smsj_set_audio_control(0x00);
- }
-
- if (m_port_rapid.found())
- {
- m_csync_counter = 0;
- m_rapid_mode = 0x00;
- m_rapid_read_state = 0;
- m_rapid_last_dc = 0xff;
- m_rapid_last_dd = 0xff;
- // Power LED remains lit again
- if (m_has_pwr_led)
- m_led_pwr = 1;
- }
-
- if (!m_is_mark_iii)
- {
- m_io_ctrl_reg = 0xff;
- m_ctrl1_th_latch = 0;
- m_ctrl2_th_latch = 0;
- m_ctrl1_th_state = 1;
- m_ctrl2_th_state = 1;
- }
-
- setup_bios();
- setup_media_slots();
-}
-
-void smssdisp_state::machine_reset()
-{
- m_store_control = 0;
- m_store_cart_selection_data = 0;
- store_select_cart(m_store_cart_selection_data);
-
- sms_state::machine_reset();
-}
-
-void gamegear_state::machine_reset()
-{
- if (m_cartslot->exists() && m_cartslot->get_sms_mode())
- m_vdp->set_sega315_5124_compatibility_mode(true);
-
- /* Initialize SIO stuff for GG */
- m_gg_sio[0] = 0x7f;
- m_gg_sio[1] = 0xff;
- m_gg_sio[2] = 0x00;
- m_gg_sio[3] = 0xff;
- m_gg_sio[4] = 0x00;
-
- sms_state::machine_reset();
-}
-
-READ8_MEMBER(smssdisp_state::sms_store_cart_select_r)
-{
- return m_store_cart_selection_data;
-}
-
-
-WRITE8_MEMBER(smssdisp_state::sms_store_cart_select_w)
-{
- store_select_cart(data);
- m_store_cart_selection_data = data;
- setup_media_slots();
-}
-
-
-void smssdisp_state::device_post_load()
-{
- store_select_cart(m_store_cart_selection_data);
-}
-
-
-// There are two known models of the Store Display Unit:
-//
-// - the one with 16 cart slots and 3 card slots;
-// - the one with 16 cart slots and 16 card slots.
-//
-// On front panel of both models there are only 16 game switches,
-// that seems to change the active cart/card slot pair or, for the 4th
-// game switch onward of the 16-3 model, the active cart slot only.
-
-void smssdisp_state::store_select_cart(uint8_t data)
-{
- uint8_t slot = data >> 4;
- uint8_t slottype = data & 0x08;
-
- // The SMS Store Display Unit only uses the logical cartridge slot to
- // map the active cartridge or card slot, of its multiple ones.
- if (slottype == 0)
- m_cartslot = m_slots[slot].target();
- else
- m_cartslot = m_cards[slot].target();
-
- logerror("switching in part of %s slot #%d\n", slottype ? "card" : "cartridge", slot);
-}
-
-WRITE8_MEMBER(smssdisp_state::sms_store_control_w)
-{
- int led_number = data >> 4;
- int led_column = led_number / 4;
- int led_line = led_number % 4;
- int game_number = (4 * led_column) + (3 - led_line);
-
- logerror("0x%04X: sms_store_control write 0x%02X\n", m_control_cpu->pc(), data);
- logerror("sms_store_control: LED #%d activated for game #%d\n", led_number, game_number);
-
- if (data & 0x02)
- {
- m_maincpu->resume(SUSPEND_REASON_HALT);
- }
- else
- {
- /* Pull reset line of CPU #0 low */
- m_maincpu->reset();
- m_maincpu->suspend(SUSPEND_REASON_HALT, 1);
- }
- m_store_control = data;
-}
-
-WRITE_LINE_MEMBER(smssdisp_state::sms_store_int_callback)
-{
- if ( m_store_control & 0x01 )
- {
- m_control_cpu->set_input_line( 0, state );
- }
- else
- {
- m_maincpu->set_input_line( 0, state );
- }
-}
-
-
-void sms1_state::video_start()
-{
- m_main_scr->register_screen_bitmap(m_prevleft_bitmap);
- m_main_scr->register_screen_bitmap(m_prevright_bitmap);
- save_item(NAME(m_prevleft_bitmap));
- save_item(NAME(m_prevright_bitmap));
- save_item(NAME(m_sscope_state));
- save_item(NAME(m_frame_sscope_state));
-
- // Allow sscope screens to have crosshair, useful for the game missil3d
- machine().crosshair().get_crosshair(0).set_screen(CROSSHAIR_SCREEN_ALL);
-}
-
-
-void sms1_state::video_reset()
-{
- if (m_port_scope->read())
- {
- uint8_t sscope_binocular_hack = m_port_scope_binocular->read();
-
- if (sscope_binocular_hack & 0x01)
- m_prevleft_bitmap.fill(rgb_t::black());
- if (sscope_binocular_hack & 0x02)
- m_prevright_bitmap.fill(rgb_t::black());
- }
-
- m_sscope_state = 0;
- m_frame_sscope_state = 0;
-}
-
-
-WRITE_LINE_MEMBER(sms1_state::sscope_vblank)
-{
- // on falling edge
- if (!state)
- {
- // Most of the 3-D games usually set Sega Scope's state for next frame
- // soon after the active area of current frame was drawn, but before
- // it is displayed by the screen update function. That function needs to
- // check the state used at the time of frame drawing, to display it on
- // the correct side. So here, when the frame is about to be drawn, the
- // Sega Scope's state is stored, to be checked by that function.
- m_frame_sscope_state = m_sscope_state;
- }
-}
-
-uint32_t sms1_state::screen_update_left(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
-{
- uint8_t sscope = m_port_scope->read();
-
- // without SegaScope, both LCDs for glasses go black
- // with SegaScope, state 0 = left screen OFF, right screen ON
- if (sscope && BIT(m_frame_sscope_state, 0))
- {
- m_vdp->screen_update(screen, bitmap, cliprect);
-
- // HACK: fake 3D->2D handling (if enabled, it repeats each frame twice on the selected lens)
- // save a copy of current bitmap for the binocular hack
- if (BIT(m_port_scope_binocular->read(), 0))
- copybitmap(m_prevleft_bitmap, bitmap, 0, 0, 0, 0, cliprect);
- }
- else
- {
- // HACK: fake 3D->2D handling (if enabled, it repeats each frame twice on the selected lens)
- // use the copied bitmap for the binocular hack
- if (sscope && BIT(m_port_scope_binocular->read(), 0))
- {
- copybitmap(bitmap, m_prevleft_bitmap, 0, 0, 0, 0, cliprect);
- return 0;
- }
- bitmap.fill(rgb_t::black(), cliprect);
- }
-
- return 0;
-}
-
-uint32_t sms1_state::screen_update_right(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
-{
- uint8_t sscope = m_port_scope->read();
-
- // without SegaScope, both LCDs for glasses go black
- // with SegaScope, state 1 = left screen ON, right screen OFF
- if (sscope && !BIT(m_frame_sscope_state, 0))
- {
- m_vdp->screen_update(screen, bitmap, cliprect);
-
- // HACK: fake 3D->2D handling (if enabled, it repeats each frame twice on the selected lens)
- // save a copy of current bitmap for the binocular hack
- if (BIT(m_port_scope_binocular->read(), 1))
- copybitmap(m_prevright_bitmap, bitmap, 0, 0, 0, 0, cliprect);
- }
- else
- {
- // HACK: fake 3D->2D handling (if enabled, it repeats each frame twice on the selected lens)
- // use the copied bitmap for the binocular hack
- if (sscope && BIT(m_port_scope_binocular->read(), 1))
- {
- copybitmap(bitmap, m_prevright_bitmap, 0, 0, 0, 0, cliprect);
- return 0;
- }
- bitmap.fill(rgb_t::black(), cliprect);
- }
-
- return 0;
-}
-
-uint32_t sms_state::screen_update_sms(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
-{
- m_vdp->screen_update(screen, bitmap, cliprect);
- return 0;
-}
-
-void gamegear_state::video_start()
-{
- m_prev_bitmap_copied = false;
- m_main_scr->register_screen_bitmap(m_prev_bitmap);
- m_main_scr->register_screen_bitmap(m_gg_sms_mode_bitmap);
- m_line_buffer = std::make_unique<int[]>(160 * 4);
-
- save_item(NAME(m_prev_bitmap_copied));
- save_item(NAME(m_prev_bitmap));
- save_item(NAME(m_gg_sms_mode_bitmap));
- save_pointer(NAME(m_line_buffer), 160 * 4);
-}
-
-void gamegear_state::video_reset()
-{
- if (m_prev_bitmap_copied)
- {
- m_prev_bitmap.fill(rgb_t::black());
- m_prev_bitmap_copied = false;
- }
- if (m_cartslot->exists() && m_cartslot->get_sms_mode())
- {
- m_gg_sms_mode_bitmap.fill(rgb_t::black());
- memset(m_line_buffer.get(), 0, 160 * 4 * sizeof(int));
- }
-}
-
-
-void gamegear_state::screen_gg_sms_mode_scaling(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
-{
- bitmap_rgb32 &vdp_bitmap = m_vdp->get_bitmap();
- const rectangle visarea = screen.visible_area();
-
- /* Plot positions relative to visarea minimum values */
- const int plot_min_x = cliprect.min_x - visarea.min_x;
- const int plot_max_x = std::min(cliprect.max_x - visarea.min_x, 159); // avoid m_line_buffer overflow.
- const int plot_min_y = cliprect.min_y - visarea.min_y;
- const int plot_max_y = cliprect.max_y - visarea.min_y;
-
- /* For each group of 3 SMS pixels, a group of 2 GG pixels is processed.
- In case the cliprect coordinates may map any region of the visible area,
- take in account the remaining position, if any, of the first group. */
- const int plot_x_first_group = plot_min_x - (plot_min_x % 2);
- const int plot_y_first_group = plot_min_y - (plot_min_y % 2);
-
- /* Calculation of the minimum scaled value for X */
- const int visarea_xcenter = visarea.xcenter();
- const int sms_offset_min_x = ((int) (visarea_xcenter - cliprect.min_x) / 2) * 3;
- const int sms_min_x = visarea_xcenter - sms_offset_min_x;
-
- /* Calculation of the minimum scaled value for Y */
- const int visarea_ycenter = visarea.ycenter();
- const int sms_offset_min_y = ((int) (visarea_ycenter - cliprect.min_y) / 2) * 3;
- const int sms_min_y = visarea_ycenter - sms_offset_min_y;
-
- int sms_y = sms_min_y;
- int y_min_i = plot_min_y - plot_y_first_group;
-
- /* Auxiliary variable for vertical scaling */
- int sms_y2 = sms_y - 1;
-
- for (int plot_y_group = plot_y_first_group; plot_y_group <= plot_max_y; plot_y_group += 2)
- {
- const int y_max_i = std::min(1, plot_max_y - plot_y_group);
-
- for (int y_i = y_min_i; y_i <= y_max_i; y_i++)
- {
- /* Include additional lines that have influence over what appears on the LCD */
- const int sms_min_y2 = sms_y + y_i - 1;
- const int sms_max_y2 = sms_y + y_i + 2;
-
- /* Process lines, but skip those already processed before */
- for (sms_y2 = std::max(sms_min_y2, sms_y2); sms_y2 <= sms_max_y2; sms_y2++)
- {
- int *combineline_buffer = m_line_buffer.get() + (sms_y2 & 0x03) * 160;
-
- if (sms_y2 >= vdp_bitmap.cliprect().min_y && sms_y2 <= vdp_bitmap.cliprect().max_y)
- {
- uint32_t *vdp_buffer = &vdp_bitmap.pix32(sms_y2);
-
- int sms_x = sms_min_x;
- int x_min_i = plot_min_x - plot_x_first_group;
-
- /* Do horizontal scaling */
- for (int plot_x_group = plot_x_first_group; plot_x_group <= plot_max_x; plot_x_group += 2)
- {
- const int x_max_i = std::min(1, plot_max_x - plot_x_group);
-
- for (int x_i = x_min_i; x_i <= x_max_i; x_i++)
- {
- int combined = 0;
-
- if (sms_x + x_i >= vdp_bitmap.cliprect().min_x && sms_x + x_i + 1 <= vdp_bitmap.cliprect().max_x)
- {
- switch (x_i)
- {
- case 0:
- /* Take red and green from first pixel, and blue from second pixel */
- combined = (vdp_buffer[sms_x] & 0x00ffff00) | (vdp_buffer[sms_x + 1] & 0x000000ff);
- break;
- case 1:
- /* Take red from second pixel, and green and blue from third pixel */
- combined = (vdp_buffer[sms_x + 1] & 0x00ff0000) | (vdp_buffer[sms_x + 2] & 0x0000ffff);
- break;
- }
- }
-
- combineline_buffer[plot_x_group + x_i] = combined;
- }
-
- sms_x += 3;
- x_min_i = 0;
- }
- }
- else
- {
- memset(combineline_buffer, 0, 160 * sizeof(int));
- }
- }
-
- /* Do vertical scaling for a screen with 192 or 224 lines
- Lines 0-2 and 221-223 have no effect on the output on the GG screen.
- We will calculate the gamegear lines as follows:
- GG_0 = 1/6 * SMS_3 + 1/3 * SMS_4 + 1/3 * SMS_5 + 1/6 * SMS_6
- GG_1 = 1/6 * SMS_4 + 1/3 * SMS_5 + 1/3 * SMS_6 + 1/6 * SMS_7
- GG_2 = 1/6 * SMS_6 + 1/3 * SMS_7 + 1/3 * SMS_8 + 1/6 * SMS_9
- GG_3 = 1/6 * SMS_7 + 1/3 * SMS_8 + 1/3 * SMS_9 + 1/6 * SMS_10
- GG_4 = 1/6 * SMS_9 + 1/3 * SMS_10 + 1/3 * SMS_11 + 1/6 * SMS_12
- .....
- GG_142 = 1/6 * SMS_216 + 1/3 * SMS_217 + 1/3 * SMS_218 + 1/6 * SMS_219
- GG_143 = 1/6 * SMS_217 + 1/3 * SMS_218 + 1/3 * SMS_219 + 1/6 * SMS_220
- */
- {
- int *line1, *line2, *line3, *line4;
-
- /* Setup our source lines */
- line1 = m_line_buffer.get() + ((sms_y + y_i - 1) & 0x03) * 160;
- line2 = m_line_buffer.get() + ((sms_y + y_i - 0) & 0x03) * 160;
- line3 = m_line_buffer.get() + ((sms_y + y_i + 1) & 0x03) * 160;
- line4 = m_line_buffer.get() + ((sms_y + y_i + 2) & 0x03) * 160;
-
- uint32_t *p_bitmap = &bitmap.pix32(visarea.min_y + plot_y_group + y_i, visarea.min_x);
-
- for (int plot_x = plot_min_x; plot_x <= plot_max_x; plot_x++)
- {
- rgb_t c1 = line1[plot_x];
- rgb_t c2 = line2[plot_x];
- rgb_t c3 = line3[plot_x];
- rgb_t c4 = line4[plot_x];
- p_bitmap[plot_x] =
- rgb_t(
- ( c1.r() / 6 + c2.r() / 3 + c3.r() / 3 + c4.r() / 6 ),
- ( c1.g() / 6 + c2.g() / 3 + c3.g() / 3 + c4.g() / 6 ),
- ( c1.b() / 6 + c2.b() / 3 + c3.b() / 3 + c4.b() / 6 )
- );
- }
- }
- }
-
- sms_y += 3;
- y_min_i = 0;
- }
-}
-
-
-uint32_t gamegear_state::screen_update_gamegear(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
-{
- bitmap_rgb32 *source_bitmap;
-
- if (m_cartslot->exists() && m_cartslot->get_sms_mode())
- {
- screen_gg_sms_mode_scaling(screen, m_gg_sms_mode_bitmap, cliprect);
- source_bitmap = &m_gg_sms_mode_bitmap;
- }
- else
- {
- source_bitmap = &m_vdp->get_bitmap();
- }
-
- if (!m_port_persist->read())
- {
- copybitmap(bitmap, *source_bitmap, 0, 0, 0, 0, cliprect);
- if (m_prev_bitmap_copied)
- {
- m_prev_bitmap.fill(rgb_t::black());
- m_prev_bitmap_copied = false;
- }
- }
- else if (!m_prev_bitmap_copied)
- {
- copybitmap(bitmap, *source_bitmap, 0, 0, 0, 0, cliprect);
- copybitmap(m_prev_bitmap, *source_bitmap, 0, 0, 0, 0, cliprect);
- m_prev_bitmap_copied = true;
- }
- else
- {
- // HACK: fake LCD persistence effect
- // (it would be better to generalize this in the core, to be used for all LCD systems)
- for (int y = cliprect.min_y; y <= cliprect.max_y; y++)
- {
- uint32_t *linedst = &bitmap.pix32(y);
- uint32_t *line0 = &source_bitmap->pix32(y);
- uint32_t *line1 = &m_prev_bitmap.pix32(y);
- for (int x = cliprect.min_x; x <= cliprect.max_x; x++)
- {
- uint32_t color0 = line0[x];
- uint32_t color1 = line1[x];
- uint16_t r0 = (color0 >> 16) & 0x000000ff;
- uint16_t g0 = (color0 >> 8) & 0x000000ff;
- uint16_t b0 = (color0 >> 0) & 0x000000ff;
- uint16_t r1 = (color1 >> 16) & 0x000000ff;
- uint16_t g1 = (color1 >> 8) & 0x000000ff;
- uint16_t b1 = (color1 >> 0) & 0x000000ff;
- uint8_t r = (uint8_t)((r0 + r1) >> 1);
- uint8_t g = (uint8_t)((g0 + g1) >> 1);
- uint8_t b = (uint8_t)((b0 + b1) >> 1);
- linedst[x] = (r << 16) | (g << 8) | b;
- }
- }
- copybitmap(m_prev_bitmap, *source_bitmap, 0, 0, 0, 0, cliprect);
- }
- return 0;
-}