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-rw-r--r--src/devices/video/i8244.cpp799
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diff --git a/src/devices/video/i8244.cpp b/src/devices/video/i8244.cpp
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+++ b/src/devices/video/i8244.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Wilbert Pol
+/***************************************************************************
+
+ i8244.c
+
+ Intel 8244 (NTSC)/8245 (PAL) Graphics and sound chip
+
+
+***************************************************************************/
+
+#include "emu.h"
+#include "i8244.h"
+
+
+// device type definition
+const device_type I8244 = &device_creator<i8244_device>;
+const device_type I8245 = &device_creator<i8245_device>;
+
+
+// Kevtris verified that the data below matches a dump
+// taken from a real chip.
+static const UINT8 c_shape[0x40 * 8] =
+{
+ 0x7C,0xC6,0xC6,0xC6,0xC6,0xC6,0x7C,0x00, // 0
+ 0x18,0x38,0x18,0x18,0x18,0x18,0x3C,0x00,
+ 0x3C,0x66,0x0C,0x18,0x30,0x60,0x7E,0x00,
+ 0x7C,0xC6,0x06,0x3C,0x06,0xC6,0x7C,0x00,
+ 0xCC,0xCC,0xCC,0xFE,0x0C,0x0C,0x0C,0x00,
+ 0xFE,0xC0,0xC0,0x7C,0x06,0xC6,0x7C,0x00,
+ 0x7C,0xC6,0xC0,0xFC,0xC6,0xC6,0x7C,0x00,
+ 0xFE,0x06,0x0C,0x18,0x30,0x60,0xC0,0x00,
+ 0x7C,0xC6,0xC6,0x7C,0xC6,0xC6,0x7C,0x00,
+ 0x7C,0xC6,0xC6,0x7E,0x06,0xC6,0x7C,0x00,
+ 0x00,0x18,0x18,0x00,0x18,0x18,0x00,0x00,
+ 0x18,0x7E,0x58,0x7E,0x1A,0x7E,0x18,0x00,
+ 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
+ 0x3C,0x66,0x0C,0x18,0x18,0x00,0x18,0x00,
+ 0xC0,0xC0,0xC0,0xC0,0xC0,0xC0,0xFE,0x00,
+ 0xFC,0xC6,0xC6,0xFC,0xC0,0xC0,0xC0,0x00,
+ 0x00,0x18,0x18,0x7E,0x18,0x18,0x00,0x00,
+ 0xC6,0xC6,0xC6,0xD6,0xFE,0xEE,0xC6,0x00,
+ 0xFE,0xC0,0xC0,0xF8,0xC0,0xC0,0xFE,0x00,
+ 0xFC,0xC6,0xC6,0xFC,0xD8,0xCC,0xC6,0x00,
+ 0x7E,0x18,0x18,0x18,0x18,0x18,0x18,0x00,
+ 0xC6,0xC6,0xC6,0xC6,0xC6,0xC6,0x7C,0x00,
+ 0x3C,0x18,0x18,0x18,0x18,0x18,0x3C,0x00,
+ 0x7C,0xC6,0xC6,0xC6,0xC6,0xC6,0x7C,0x00,
+ 0x7C,0xC6,0xC6,0xC6,0xDE,0xCC,0x76,0x00,
+ 0x7C,0xC6,0xC0,0x7C,0x06,0xC6,0x7C,0x00,
+ 0xFC,0xC6,0xC6,0xC6,0xC6,0xC6,0xFC,0x00,
+ 0xFE,0xC0,0xC0,0xF8,0xC0,0xC0,0xC0,0x00,
+ 0x7C,0xC6,0xC0,0xC0,0xCE,0xC6,0x7E,0x00,
+ 0xC6,0xC6,0xC6,0xFE,0xC6,0xC6,0xC6,0x00,
+ 0x06,0x06,0x06,0x06,0x06,0xC6,0x7C,0x00,
+ 0xC6,0xCC,0xD8,0xF0,0xD8,0xCC,0xC6,0x00,
+ 0x38,0x6C,0xC6,0xC6,0xFE,0xC6,0xC6,0x00,
+ 0x7E,0x06,0x0C,0x18,0x30,0x60,0x7E,0x00,
+ 0xC6,0xC6,0x6C,0x38,0x6C,0xC6,0xC6,0x00,
+ 0x7C,0xC6,0xC0,0xC0,0xC0,0xC6,0x7C,0x00,
+ 0xC6,0xC6,0xC6,0xC6,0xC6,0x6C,0x38,0x00,
+ 0xFC,0xC6,0xC6,0xFC,0xC6,0xC6,0xFC,0x00,
+ 0xC6,0xEE,0xFE,0xD6,0xC6,0xC6,0xC6,0x00,
+ 0x00,0x00,0x00,0x00,0x00,0x18,0x18,0x00,
+ 0x00,0x00,0x00,0x7E,0x00,0x00,0x00,0x00,
+ 0x00,0x66,0x3C,0x18,0x3C,0x66,0x00,0x00,
+ 0x00,0x18,0x00,0x7E,0x00,0x18,0x00,0x00,
+ 0x00,0x00,0x7E,0x00,0x7E,0x00,0x00,0x00,
+ 0x66,0x66,0x66,0x3C,0x18,0x18,0x18,0x00,
+ 0xC6,0xE6,0xF6,0xFE,0xDE,0xCE,0xC6,0x00,
+ 0x03,0x06,0x0C,0x18,0x30,0x60,0xC0,0x00,
+ 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x00,
+ 0xCE,0xDB,0xDB,0xDB,0xDB,0xDB,0xCE,0x00,
+ 0x00,0x00,0x3C,0x7E,0x7E,0x7E,0x3C,0x00,
+ 0x1C,0x1C,0x18,0x1E,0x18,0x18,0x1C,0x00,
+ 0x1C,0x1C,0x18,0x1E,0x18,0x34,0x26,0x00,
+ 0x38,0x38,0x18,0x78,0x18,0x2C,0x64,0x00,
+ 0x38,0x38,0x18,0x78,0x18,0x18,0x38,0x00,
+ 0x00,0x18,0x0C,0xFE,0x0C,0x18,0x00,0x00,
+ 0x18,0x3C,0x7E,0xFF,0xFF,0x18,0x18,0x00,
+ 0x03,0x07,0x0F,0x1F,0x3F,0x7F,0xFF,0x00,
+ 0xC0,0xE0,0xF0,0xF8,0xFC,0xFE,0xFF,0x00,
+ 0x38,0x38,0x12,0xFE,0xB8,0x28,0x6C,0x00,
+ 0xC0,0x60,0x30,0x18,0x0C,0x06,0x03,0x00,
+ 0x00,0x00,0x0C,0x08,0x08,0x7F,0x3E,0x00,
+ 0x00,0x03,0x63,0xFF,0xFF,0x18,0x08,0x00,
+ 0x00,0x00,0x00,0x10,0x38,0xFF,0x7E,0x00
+};
+
+
+// Background and grid information is stored in RGB format
+// while the character and sprite colors are stored in BGR
+// format.
+static const UINT8 bgr2rgb[8] =
+{
+ 0x00, 0x04, 0x02, 0x06, 0x01, 0x05, 0x03, 0x07
+};
+
+
+//-------------------------------------------------
+// i8244_device - constructor
+//-------------------------------------------------
+
+i8244_device::i8244_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : device_t(mconfig, I8244, "I8244", tag, owner, clock, "i8244", __FILE__)
+ , device_sound_interface(mconfig, *this)
+ , device_video_interface(mconfig, *this)
+ , m_irq_func(*this)
+ , m_postprocess_func(*this)
+ , m_start_vpos(START_Y)
+ , m_start_vblank(START_Y + SCREEN_HEIGHT)
+ , m_screen_lines(LINES)
+{
+}
+
+
+i8244_device::i8244_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, int lines, const char *shortname, const char *source)
+ : device_t(mconfig, type, name, tag, owner, clock, shortname, source)
+ , device_sound_interface(mconfig, *this)
+ , device_video_interface(mconfig, *this)
+ , m_irq_func(*this)
+ , m_postprocess_func(*this)
+ , m_start_vpos(START_Y)
+ , m_start_vblank(START_Y + SCREEN_HEIGHT)
+ , m_screen_lines(lines)
+{
+}
+
+
+i8245_device::i8245_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : i8244_device(mconfig, I8245, "I8245", tag, owner, clock, i8245_device::LINES, "i8245", __FILE__)
+{
+}
+
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void i8244_device::device_start()
+{
+ // Let the screen create our temporary bitmap with the screen's dimensions
+ m_screen->register_screen_bitmap(m_tmp_bitmap);
+
+ m_line_timer = timer_alloc(TIMER_LINE);
+ m_line_timer->adjust( m_screen->time_until_pos(1, START_ACTIVE_SCAN ), 0, m_screen->scan_period() );
+
+ m_hblank_timer = timer_alloc(TIMER_HBLANK);
+ m_hblank_timer->adjust( m_screen->time_until_pos(1, END_ACTIVE_SCAN + 18 ), 0, m_screen->scan_period() );
+
+ m_irq_func.resolve_safe();
+ m_postprocess_func.resolve_safe();
+
+ // allocate a stream
+ m_stream = stream_alloc( 0, 1, clock()/(LINE_CLOCKS*4) );
+
+ // register our state
+ save_pointer(NAME(m_vdc.reg), 0x100);
+ save_item(NAME(m_sh_count));
+ save_item(NAME(m_x_beam_pos));
+ save_item(NAME(m_y_beam_pos));
+ save_item(NAME(m_control_status));
+ save_item(NAME(m_collision_status));
+ save_item(NAME(m_iff));
+}
+
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void i8244_device::device_reset()
+{
+ memset(m_vdc.reg, 0, 0x100);
+
+ m_sh_count = 0;
+ m_x_beam_pos = 0;
+ m_y_beam_pos = 0;
+ m_control_status = 0;
+ m_collision_status = 0;
+ m_iff = 0;
+}
+
+
+PALETTE_INIT_MEMBER(i8244_device, i8244)
+{
+ static const UINT8 i8244_colors[3*16] =
+ {
+ 0x00, 0x00, 0x00, // i r g b
+ 0x00, 0x00, 0xAA, // i r g B
+ 0x00, 0xAA, 0x00, // i r G b
+ 0x00, 0xAA, 0xAA, // i r G B
+ 0xAA, 0x00, 0x00, // i R g b
+ 0xAA, 0x00, 0xAA, // i R g B
+ 0xAA, 0xAA, 0x00, // i R G b
+ 0xAA, 0xAA, 0xAA, // i R G B
+ 0x55, 0x55, 0x55, // I r g b
+ 0x55, 0x55, 0xFF, // I r g B
+ 0x55, 0xFF, 0x55, // I r G b
+ 0x55, 0xFF, 0xFF, // I r G B
+ 0xFF, 0x55, 0x55, // I R g b
+ 0xFF, 0x55, 0xFF, // I R g B
+ 0xFF, 0xFF, 0x55, // I R G b
+ 0xFF, 0xFF, 0xFF, // I R G B
+ };
+
+ for ( int i = 0; i < 16; i++ )
+ {
+ palette.set_pen_color( i, i8244_colors[i*3], i8244_colors[i*3+1], i8244_colors[i*3+2] );
+ }
+}
+
+
+void i8244_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
+{
+ int vpos = m_screen->vpos();
+
+ switch ( id )
+ {
+ case TIMER_LINE:
+ // handle i824x line timer
+ render_scanline(vpos);
+ break;
+
+ case TIMER_HBLANK:
+ // handle i824x HBlank timer
+ if ( vpos < m_start_vpos - 1 )
+ {
+ return;
+ }
+
+ if ( vpos < m_start_vblank - 1 )
+ {
+ m_control_status |= 0x01;
+ }
+ break;
+ }
+}
+
+
+int i8244_device::get_y_beam()
+{
+ int y = m_screen->vpos() - m_start_vpos;
+
+ // The Y register becomes 0 only when the VBlank signal is turned off!
+ if ( y < 0 || ( y == 0 && m_screen->hpos() < 366+42 ) )
+ {
+ y += m_screen_lines;
+ }
+
+ return y;
+}
+
+
+int i8244_device::get_x_beam()
+{
+ int x = m_screen->hpos() - START_ACTIVE_SCAN;
+
+ if ( x < 0 )
+ {
+ x += LINE_CLOCKS;
+ }
+
+ return x >> 1;
+}
+
+
+offs_t i8244_device::fix_register_mirrors( offs_t offset )
+{
+ // registers $40,$41 are mirrored at $44,$45, $48,$49, and $4C,$4D
+ if ( ( offset & 0xF2 ) == 0x40 )
+ {
+ offset &= ~0x0C;
+ }
+
+ // registers $A0-$AF are mirrored at $B0-$BF
+ if ( ( offset & 0xF0 ) == 0xB0 )
+ {
+ offset &= ~0x10;
+ }
+
+ return offset;
+}
+
+
+READ8_MEMBER(i8244_device::read)
+{
+ UINT8 data = 0;
+
+ offset = fix_register_mirrors( offset );
+
+ switch (offset)
+ {
+ case 0xa1:
+ data = m_control_status & 0xFE;
+ m_iff = 0;
+ m_irq_func(CLEAR_LINE);
+ m_control_status &= ~0x08;
+ if ( hblank() )
+ {
+ data |= 1;
+ }
+ break;
+
+ case 0xa2:
+ data = m_collision_status;
+ m_collision_status = 0;
+ break;
+
+ case 0xa4:
+ if (m_vdc.s.control & VDC_CONTROL_REG_STROBE_XY)
+ {
+ m_y_beam_pos = get_y_beam();
+ }
+ data = m_y_beam_pos;
+ break;
+
+
+ case 0xa5:
+ if ((m_vdc.s.control & VDC_CONTROL_REG_STROBE_XY))
+ {
+ m_x_beam_pos = get_x_beam();
+ }
+ data = m_x_beam_pos;
+ break;
+
+ default:
+ data = m_vdc.reg[offset];
+ break;
+ }
+
+ return data;
+}
+
+
+WRITE8_MEMBER(i8244_device::write)
+{
+ offset = fix_register_mirrors( offset );
+
+ /* Update the sound */
+ if( offset >= 0xa7 && offset <= 0xaa )
+ {
+ m_stream->update();
+ }
+
+ if (offset == 0xa0)
+ {
+ if ( ( m_vdc.s.control & VDC_CONTROL_REG_STROBE_XY )
+ && !(data & VDC_CONTROL_REG_STROBE_XY))
+ {
+ /* Toggling strobe bit, tuck away values */
+ m_x_beam_pos = get_x_beam();
+ m_y_beam_pos = get_y_beam();
+ }
+ }
+
+ m_vdc.reg[offset] = data;
+}
+
+
+READ_LINE_MEMBER(i8244_device::vblank)
+{
+ if ( m_screen->vpos() > m_start_vpos && m_screen->vpos() < m_start_vblank )
+ {
+ return 0;
+ }
+ return 1;
+}
+
+
+READ_LINE_MEMBER(i8244_device::hblank)
+{
+ int hpos = m_screen->hpos();
+ int vpos = m_screen->vpos();
+
+ if ( hpos >= START_ACTIVE_SCAN && hpos < END_ACTIVE_SCAN )
+ {
+ return 0;
+ }
+
+ // Before active area?
+ if ( vpos < m_start_vpos - 1 )
+ {
+ return 0;
+ }
+
+ // During active area?
+ if ( vpos < m_start_vblank - 1 )
+ {
+ return 1;
+ }
+
+ // After active area
+ return 0;
+}
+
+
+void i8244_device::render_scanline(int vpos)
+{
+ // Some local constants for this method
+ //static const UINT8 COLLISION_SPRITE_0 = 0x01;
+ //static const UINT8 COLLISION_SPRITE_1 = 0x02;
+ //static const UINT8 COLLISION_SPRITE_2 = 0x04;
+ //static const UINT8 COLLISION_SPRITE_3 = 0x08;
+ static const UINT8 COLLISION_VERTICAL_GRID = 0x10;
+ static const UINT8 COLLISION_HORIZ_GRID_DOTS = 0x20;
+ //static const UINT8 COLLISION_EXTERNAL_UNUSED = 0x40;
+ static const UINT8 COLLISION_CHARACTERS = 0x80;
+
+ UINT8 collision_map[160];
+
+ if ( vpos == m_start_vpos )
+ {
+ m_control_status &= ~0x08;
+ }
+
+ if ( m_start_vpos < vpos && vpos < m_start_vblank )
+ {
+ rectangle rect;
+ int scanline = vpos - m_start_vpos;
+
+ m_control_status &= ~ 0x01;
+
+ /* Draw a line */
+ rect.set(START_ACTIVE_SCAN, END_ACTIVE_SCAN - 1, vpos, vpos);
+ m_tmp_bitmap.fill( (m_vdc.s.color >> 3) & 0x7, rect );
+
+ /* Clear collision map */
+ memset( collision_map, 0, sizeof( collision_map ) );
+
+ /* Display grid if enabled */
+ if ( m_vdc.s.control & 0x08 )
+ {
+ UINT16 color = ( m_vdc.s.color & 7 ) | ( ( m_vdc.s.color >> 3 ) & 0x08 );
+ int x_grid_offset = 8;
+ int y_grid_offset = 24;
+ int width = 16;
+ int height = 24;
+ int w = ( m_vdc.s.control & 0x80 ) ? width : 2;
+
+ /* Draw horizontal part of grid */
+ for ( int j = 1, y = 0; y < 9; y++, j <<= 1 )
+ {
+ if ( y_grid_offset + y * height <= scanline && scanline < y_grid_offset + y * height + 3 )
+ {
+ for ( int i = 0; i < 9; i++ )
+ {
+ if ( ( m_vdc.s.hgrid[0][i] & j ) || ( m_vdc.s.hgrid[1][i] & ( j >> 8 ) ) )
+ {
+ for ( int k = 0; k < width + 2; k++ )
+ {
+ int px = x_grid_offset + i * width + k;
+
+ if ( px < 160 )
+ {
+ collision_map[ px ] |= COLLISION_HORIZ_GRID_DOTS;
+ m_tmp_bitmap.pix16( vpos, START_ACTIVE_SCAN + 10 + 2 * px ) = color;
+ m_tmp_bitmap.pix16( vpos, START_ACTIVE_SCAN + 10 + 2 * px + 1 ) = color;
+ }
+ }
+ }
+ }
+ }
+ }
+
+ /* Draw vertical part of grid */
+ for( int j = 1, y = 0; y < 8; y++, j <<= 1 )
+ {
+ if ( y_grid_offset + y * height <= scanline && scanline < y_grid_offset + ( y + 1 ) * height )
+ {
+ for ( int i = 0; i < 10; i++ )
+ {
+ if ( m_vdc.s.vgrid[i] & j )
+ {
+ for ( int k = 0; k < w; k++ )
+ {
+ int px = x_grid_offset + i * width + k;
+
+ if ( px < 160 )
+ {
+ /* Check if we collide with an already drawn source object */
+ if ( collision_map[ px ] & m_vdc.s.collision )
+ {
+ m_collision_status |= COLLISION_VERTICAL_GRID;
+ }
+ /* Check if an already drawn object would collide with us */
+ if ( COLLISION_VERTICAL_GRID & m_vdc.s.collision && collision_map[ px ] )
+ {
+ m_collision_status |= collision_map[ px ];
+ }
+ collision_map[ px ] |= COLLISION_VERTICAL_GRID;
+ m_tmp_bitmap.pix16( vpos, START_ACTIVE_SCAN + 10 + 2 * px ) = color;
+ m_tmp_bitmap.pix16( vpos, START_ACTIVE_SCAN + 10 + 2 * px + 1 ) = color;
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+
+ /* Display objects if enabled */
+ if ( m_vdc.s.control & 0x20 )
+ {
+ /* Regular foreground objects */
+ for ( int i = 0; i < ARRAY_LENGTH( m_vdc.s.foreground ); i++ )
+ {
+ int y = m_vdc.s.foreground[i].y & 0xFE;
+ int height = 8 - ( ( ( y >> 1 ) + m_vdc.s.foreground[i].ptr ) & 7 );
+
+ if ( y >= 0x0E && y <= scanline && scanline < y + height * 2 )
+ {
+ UINT16 color = 8 + bgr2rgb[ ( ( m_vdc.s.foreground[i].color >> 1 ) & 0x07 ) ];
+ int offset = ( m_vdc.s.foreground[i].ptr | ( ( m_vdc.s.foreground[i].color & 0x01 ) << 8 ) ) + ( y >> 1 ) + ( ( scanline - y ) >> 1 );
+ UINT8 chr = c_shape[ offset & 0x1FF ];
+ int x = m_vdc.s.foreground[i].x;
+
+ for ( UINT8 m = 0x80; m > 0; m >>= 1, x++ )
+ {
+ if ( chr & m )
+ {
+ if ( x >= 0 && x < 160 )
+ {
+ /* Check if we collide with an already drawn source object */
+ if ( collision_map[ x ] & m_vdc.s.collision )
+ {
+ m_collision_status |= COLLISION_CHARACTERS;
+ }
+ /* Check if an already drawn object would collide with us */
+ if ( COLLISION_CHARACTERS & m_vdc.s.collision && collision_map[ x ] )
+ {
+ m_collision_status |= collision_map[ x ];
+ }
+ collision_map[ x ] |= COLLISION_CHARACTERS;
+ m_tmp_bitmap.pix16( vpos, START_ACTIVE_SCAN + 10 + 2 * x ) = color;
+ m_tmp_bitmap.pix16( vpos, START_ACTIVE_SCAN + 10 + 2 * x + 1 ) = color;
+ }
+ }
+ }
+ }
+ }
+
+ /* Quad objects */
+ for ( int i = 0; i < ARRAY_LENGTH( m_vdc.s.quad ); i++ )
+ {
+ int y = m_vdc.s.quad[i].single[0].y;
+ int height = 8;
+
+ if ( y <= scanline && scanline < y + height * 2 )
+ {
+ int x = m_vdc.s.quad[i].single[0].x;
+
+ // Charaecter height is always determined by the height of the 4th character
+ int char_height = 8 - ( ( ( y >> 1 ) + m_vdc.s.quad[i].single[3].ptr ) & 7 );
+
+ for ( int j = 0; j < ARRAY_LENGTH( m_vdc.s.quad[0].single ); j++, x += 8 )
+ {
+ if ( y <= scanline && scanline < y + char_height * 2 )
+ {
+ UINT16 color = 8 + bgr2rgb[ ( ( m_vdc.s.quad[i].single[j].color >> 1 ) & 0x07 ) ];
+ int offset = ( m_vdc.s.quad[i].single[j].ptr | ( ( m_vdc.s.quad[i].single[j].color & 0x01 ) << 8 ) ) + ( y >> 1 ) + ( ( scanline - y ) >> 1 );
+ UINT8 chr = c_shape[ offset & 0x1FF ];
+
+ for ( UINT8 m = 0x80; m > 0; m >>= 1, x++ )
+ {
+ if ( chr & m )
+ {
+ if ( x >= 0 && x < 160 )
+ {
+ /* Check if we collide with an already drawn source object */
+ if ( collision_map[ x ] & m_vdc.s.collision )
+ {
+ m_collision_status |= COLLISION_CHARACTERS;
+ }
+ /* Check if an already drawn object would collide with us */
+ if ( COLLISION_CHARACTERS & m_vdc.s.collision && collision_map[ x ] )
+ {
+ m_collision_status |= collision_map[ x ];
+ }
+ collision_map[ x ] |= COLLISION_CHARACTERS;
+ m_tmp_bitmap.pix16( vpos, START_ACTIVE_SCAN + 10 + 2 * x ) = color;
+ m_tmp_bitmap.pix16( vpos, START_ACTIVE_SCAN + 10 + 2 * x + 1 ) = color;
+ }
+ }
+ }
+ }
+ else
+ {
+ x += 8;
+ }
+ }
+ }
+ }
+
+ /* Sprites */
+ for ( int i = 0; i < ARRAY_LENGTH( m_vdc.s.sprites ); i++ )
+ {
+ int y = m_vdc.s.sprites[i].y;
+ int height = 8;
+
+ if ( m_vdc.s.sprites[i].color & 4 )
+ {
+ /* Zoomed sprite */
+ if ( y <= scanline && scanline < y + height * 4 )
+ {
+ UINT16 color = 8 + bgr2rgb[ ( ( m_vdc.s.sprites[i].color >> 3 ) & 0x07 ) ];
+ UINT8 chr = m_vdc.s.shape[i][ ( ( scanline - y ) >> 2 ) ];
+ int x = m_vdc.s.sprites[i].x;
+ int x_shift = 0;
+
+ switch ( m_vdc.s.sprites[i].color & 0x03 )
+ {
+ case 1: // Xg attribute set
+ x_shift = 2;
+ break;
+ case 2: // S attribute set
+ x_shift = ( ( ( scanline - y ) >> 1 ) & 0x01 ) ^ 0x01;
+ break;
+ case 3: // Xg and S attributes set
+ x_shift = ( ( scanline - y ) >> 1 ) & 0x01;
+ break;
+ }
+ x_shift <<= 1;
+
+ for ( UINT8 m = 0x01; m > 0; m <<= 1, x += 2 )
+ {
+ if ( chr & m )
+ {
+ if ( x >= 0 && x < 160 )
+ {
+ /* Check if we collide with an already drawn source object */
+ if ( collision_map[ x ] & m_vdc.s.collision )
+ {
+ m_collision_status |= ( 1 << i );
+ }
+ /* Check if an already drawn object would collide with us */
+ if ( ( 1 << i ) & m_vdc.s.collision && collision_map[ x ] )
+ {
+ m_collision_status |= collision_map[ x ];
+ }
+ collision_map[ x ] |= ( 1 << i );
+ m_tmp_bitmap.pix16( vpos, START_ACTIVE_SCAN + 10 + x_shift + 2 * x ) = color;
+ m_tmp_bitmap.pix16( vpos, START_ACTIVE_SCAN + 10 + x_shift + 2 * x + 1 ) = color;
+ }
+ if ( x >= -1 && x < 159 )
+ {
+ if ( x >= 0 )
+ {
+ /* Check if we collide with an already drawn source object */
+ if ( collision_map[ x ] & m_vdc.s.collision )
+ {
+ m_collision_status |= ( 1 << i );
+ }
+ /* Check if an already drawn object would collide with us */
+ if ( ( 1 << i ) & m_vdc.s.collision && collision_map[ x ] )
+ {
+ m_collision_status |= collision_map[ x ];
+ }
+ collision_map[ x ] |= ( 1 << i );
+ }
+ m_tmp_bitmap.pix16( vpos, START_ACTIVE_SCAN + 10 + x_shift + 2 * x + 2 ) = color;
+ m_tmp_bitmap.pix16( vpos, START_ACTIVE_SCAN + 10 + x_shift + 2 * x + 3 ) = color;
+ }
+ }
+ }
+ }
+ }
+ else
+ {
+ /* Regular sprite */
+ if ( y <= scanline && scanline < y + height * 2 )
+ {
+ UINT16 color = 8 + bgr2rgb[ ( ( m_vdc.s.sprites[i].color >> 3 ) & 0x07 ) ];
+ UINT8 chr = m_vdc.s.shape[i][ ( ( scanline - y ) >> 1 ) ];
+ int x = m_vdc.s.sprites[i].x;
+ int x_shift = 0;
+
+ switch ( m_vdc.s.sprites[i].color & 0x03 )
+ {
+ case 1: // Xg attribute set
+ x_shift = 1;
+ break;
+ case 2: // S attribute set
+ x_shift = ( ( ( scanline - y ) >> 1 ) & 0x01 ) ^ 0x01;
+ break;
+ case 3: // Xg and S attributes set
+ x_shift = ( ( scanline - y ) >> 1 ) & 0x01;
+ break;
+ }
+
+ for ( UINT8 m = 0x01; m > 0; m <<= 1, x++ )
+ {
+ if ( chr & m )
+ {
+ if ( x >= 0 && x < 160 )
+ {
+ /* Check if we collide with an already drawn source object */
+ if ( collision_map[ x ] & m_vdc.s.collision )
+ {
+ m_collision_status |= ( 1 << i );
+ }
+ /* Check if an already drawn object would collide with us */
+ if ( ( 1 << i ) & m_vdc.s.collision && collision_map[ x ] )
+ {
+ m_collision_status |= collision_map[ x ];
+ }
+ collision_map[ x ] |= ( 1 << i );
+ m_tmp_bitmap.pix16( vpos, START_ACTIVE_SCAN + 10 + x_shift + 2 * x ) = color;
+ m_tmp_bitmap.pix16( vpos, START_ACTIVE_SCAN + 10 + x_shift + 2 * x + 1 ) = color;
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+
+ // Allow driver to do additional processing
+ m_postprocess_func( vpos );
+
+ /* Check for start of VBlank */
+ if ( vpos == m_start_vblank )
+ {
+ m_control_status |= 0x08;
+ if ( ! m_iff )
+ {
+ m_iff = 1;
+ m_irq_func(ASSERT_LINE);
+ }
+ }
+}
+
+
+void i8244_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples)
+{
+ UINT32 old_signal, signal;
+ int ii;
+ int period;
+ stream_sample_t *buffer = outputs[0];
+
+ /* Generate the signal */
+ old_signal = signal = m_vdc.s.shift3 | (m_vdc.s.shift2 << 8) | (m_vdc.s.shift1 << 16);
+
+ if( m_vdc.s.sound & 0x80 ) /* Sound is enabled */
+ {
+ for( ii = 0; ii < samples; ii++, buffer++ )
+ {
+ *buffer = 0;
+ *buffer = signal & 0x1;
+ period = (m_vdc.s.sound & 0x20) ? 1 : 4;
+ if( ++m_sh_count >= period )
+ {
+ m_sh_count = 0;
+ signal >>= 1;
+ /* Loop sound */
+ signal |= *buffer << 23;
+ /* Check if noise should be applied */
+ if ( m_vdc.s.sound & 0x10 )
+ {
+ /* Noise tap is on bits 0 and 5 and fed back to bits 15 (and 23!) */
+ UINT32 new_bit = ( ( old_signal ) ^ ( old_signal >> 5 ) ) & 0x01;
+ signal = ( old_signal & 0xFF0000 ) | ( ( old_signal & 0xFFFF ) >> 1 ) | ( new_bit << 15 ) | ( new_bit << 23 );
+ }
+ m_vdc.s.shift3 = signal & 0xFF;
+ m_vdc.s.shift2 = ( signal >> 8 ) & 0xFF;
+ m_vdc.s.shift1 = ( signal >> 16 ) & 0xFF;
+ old_signal = signal;
+ }
+
+ /* Throw an interrupt if enabled */
+ if( m_vdc.s.control & 0x4 )
+ {
+ // This feature does not seem to be finished/enabled in hardware!
+ }
+
+ /* Adjust volume */
+ *buffer *= m_vdc.s.sound & 0xf;
+ /* Pump the volume up */
+ *buffer <<= 10;
+ }
+ }
+ else
+ {
+ /* Sound disabled, so clear the buffer */
+ for( ii = 0; ii < samples; ii++, buffer++ )
+ {
+ *buffer = 0;
+ }
+ }
+}
+
+
+UINT32 i8244_device::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
+{
+ copybitmap( bitmap, m_tmp_bitmap, 0, 0, 0, 0, cliprect );
+
+ return 0;
+}