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https://github.com/holub/mame
synced 2025-07-01 16:19:38 +03:00
i8244: split big screen_update function into several pieces
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hap
parent
429ab3ca12
commit
31fb8f5c51
@ -4,8 +4,16 @@
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/***************************************************************************
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Intel 8244 (NTSC)/8245 (PAL) Graphics and sound chip
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Exclusively used in Odyssey 2 series.
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Exclusively used in Odyssey 2 series. See driver file for known problems.
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Features summary:
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- 9*8 grid
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- major system (predefined 8*7 objects, 12 single + 4 quads)
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- minor system (4 user-defined 8*8 sprites)
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- collision detection between all layers
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- 1-bit sound
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See Odyssey 2 driver file for known problems.
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***************************************************************************/
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@ -26,9 +34,7 @@ DEFINE_DEVICE_TYPE(I8245, i8245_device, "i8245", "Intel 8245")
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i8244_device::i8244_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
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: i8244_device(mconfig, I8244, tag, owner, clock)
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{
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}
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{ }
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i8244_device::i8244_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock)
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: device_t(mconfig, type, tag, owner, clock)
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@ -36,13 +42,24 @@ i8244_device::i8244_device(const machine_config &mconfig, device_type type, cons
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, device_video_interface(mconfig, *this)
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, m_irq_func(*this)
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, m_charset(*this, "cgrom")
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{
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}
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{ }
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i8245_device::i8245_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock)
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: i8244_device(mconfig, I8245, tag, owner, clock)
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{ }
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//-------------------------------------------------
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// device configuration
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//-------------------------------------------------
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void i8244_device::device_config_complete()
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{
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if (!has_screen())
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return;
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if (!screen().refresh_attoseconds())
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screen().set_raw(clock()*2, m_htotal, m_cropx, m_cropx + m_width, m_vtotal, m_cropy, m_cropy + m_height);
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}
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void i8244_device::set_default_params()
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@ -90,7 +107,6 @@ ROM_START( i8244 )
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ROM_LOAD( "charset_i8244.bin", 0x0000, 0x0200, CRC(b46a3f31) SHA1(415382715455b47b69401b3d60bd8f0036dd7fef) )
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ROM_END
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const tiny_rom_entry *i8244_device::device_rom_region() const
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{
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return ROM_NAME( i8244 );
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@ -98,18 +114,33 @@ const tiny_rom_entry *i8244_device::device_rom_region() const
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//-------------------------------------------------
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// device_config_complete - perform any
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// operations now that the configuration is
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// complete
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// i8244_palette - default palette
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//-------------------------------------------------
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void i8244_device::device_config_complete()
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void i8244_device::i8244_palette(palette_device &palette) const
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{
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if (!has_screen())
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return;
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// RGB output, before any NTSC/PAL RF encoder
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static constexpr rgb_t i8244_colors[16] =
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{
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{ 0x00, 0x00, 0x00 }, // i r g b
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{ 0xb6, 0x00, 0x00 }, // i R g b
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{ 0x00, 0xb6, 0x00 }, // i r G b
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{ 0xb6, 0xb6, 0x00 }, // i R G b
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{ 0x00, 0x00, 0xb6 }, // i r g B
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{ 0xb6, 0x00, 0xb6 }, // i R g B
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{ 0x00, 0xb6, 0xb6 }, // i r G B
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{ 0xb6, 0xb6, 0xb6 }, // i R G B
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{ 0x49, 0x49, 0x49 }, // I r g b
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{ 0xff, 0x49, 0x49 }, // I R g b
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{ 0x49, 0xff, 0x49 }, // I r G b
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{ 0xff, 0xff, 0x49 }, // I R G b
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{ 0x49, 0x49, 0xff }, // I r g B
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{ 0xff, 0x49, 0xff }, // I R g B
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{ 0x49, 0xff, 0xff }, // I r G B
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{ 0xff, 0xff, 0xff } // I R G B
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};
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if (!screen().refresh_attoseconds())
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screen().set_raw(clock()*2, m_htotal, m_cropx, m_cropx + m_width, m_vtotal, m_cropy, m_cropy + m_height);
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palette.set_pen_colors(0, i8244_colors);
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}
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@ -153,32 +184,9 @@ void i8244_device::device_start()
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}
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void i8244_device::i8244_palette(palette_device &palette) const
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{
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// RGB output, before any NTSC/PAL RF encoder
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static constexpr rgb_t i8244_colors[16] =
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{
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{ 0x00, 0x00, 0x00 }, // i r g b
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{ 0xb6, 0x00, 0x00 }, // i R g b
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{ 0x00, 0xb6, 0x00 }, // i r G b
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{ 0xb6, 0xb6, 0x00 }, // i R G b
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{ 0x00, 0x00, 0xb6 }, // i r g B
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{ 0xb6, 0x00, 0xb6 }, // i R g B
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{ 0x00, 0xb6, 0xb6 }, // i r G B
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{ 0xb6, 0xb6, 0xb6 }, // i R G B
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{ 0x49, 0x49, 0x49 }, // I r g b
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{ 0xff, 0x49, 0x49 }, // I R g b
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{ 0x49, 0xff, 0x49 }, // I r G b
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{ 0xff, 0xff, 0x49 }, // I R G b
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{ 0x49, 0x49, 0xff }, // I r g B
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{ 0xff, 0x49, 0xff }, // I R g B
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{ 0x49, 0xff, 0xff }, // I r G B
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{ 0xff, 0xff, 0xff } // I R G B
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};
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palette.set_pen_colors(0, i8244_colors);
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}
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//-------------------------------------------------
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// device_timer - handle timer callbacks
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//-------------------------------------------------
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void i8244_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
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{
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@ -201,6 +209,10 @@ void i8244_device::device_timer(emu_timer &timer, device_timer_id id, int param,
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}
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/***************************************************************************
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I/O
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***************************************************************************/
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offs_t i8244_device::fix_register_mirrors(offs_t offset)
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{
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// quad x/y registers are mirrored for each quad
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@ -472,58 +484,12 @@ void i8244_device::write_cx(int x, bool cx)
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}
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void i8244_device::draw_char(u8 index, int x, int y, u8 pixel, u16 color, bitmap_ind16 &bitmap, const rectangle &cliprect)
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/***************************************************************************
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RENDER
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***************************************************************************/
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void i8244_device::draw_grid(int scanline, bitmap_ind16 &bitmap, const rectangle &cliprect)
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{
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for (int px = x; px < x + 2; px++)
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{
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if (cliprect.contains(px, y))
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{
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u8 colx = m_collision_map[px];
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// check collision with self
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if (index < m_priority_map[px])
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{
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m_control_status |= 0x80;
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// TODO: much more complex on actual console (weird glitches happen)
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if (colx & 0x80)
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continue;
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}
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else
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m_priority_map[px] = index;
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if (pixel)
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{
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// check if we collide with an already drawn source object
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if (m_vdc.s.collision & colx)
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m_collision_status |= 0x80;
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// check if an already drawn object would collide with us
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if (m_vdc.s.collision & 0x80)
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m_collision_status |= colx;
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m_collision_map[px] |= 0x80;
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bitmap.pix(y, px) = color;
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}
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}
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}
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}
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u32 i8244_device::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
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{
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// draw background color
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bitmap.fill(bitswap<3>(m_vdc.s.color,3,4,5), cliprect);
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for (int scanline = cliprect.min_y; scanline <= cliprect.max_y; scanline++)
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{
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// clear collision maps
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memset(m_collision_map, 0, sizeof(m_collision_map));
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memset(m_priority_map, 0, sizeof(m_priority_map));
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// display grid if enabled
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if (m_vdc.s.control & 0x08)
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{
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u16 color = bitswap<4>(m_vdc.s.color,6,0,1,2);
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int x_grid_offset = 13;
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int y_grid_offset = 24;
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@ -611,11 +577,49 @@ u32 i8244_device::screen_update(screen_device &screen, bitmap_ind16 &bitmap, con
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}
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}
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}
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}
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}
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// display objects if enabled
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if (m_vdc.s.control & 0x20 && scanline <= 242)
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void i8244_device::char_pixel(u8 index, int x, int y, u8 pixel, u16 color, bitmap_ind16 &bitmap, const rectangle &cliprect)
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{
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for (int px = x; px < x + 2; px++)
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{
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if (cliprect.contains(px, y))
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{
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u8 colx = m_collision_map[px];
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// check collision with self
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if (index < m_priority_map[px])
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{
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m_control_status |= 0x80;
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// TODO: much more complex on actual console (weird glitches happen)
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if (colx & 0x80)
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continue;
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}
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else
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m_priority_map[px] = index;
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if (pixel)
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{
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// check if we collide with an already drawn source object
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if (m_vdc.s.collision & colx)
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m_collision_status |= 0x80;
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// check if an already drawn object would collide with us
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if (m_vdc.s.collision & 0x80)
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m_collision_status |= colx;
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m_collision_map[px] |= 0x80;
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bitmap.pix(y, px) = color;
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}
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}
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}
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}
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void i8244_device::draw_major(int scanline, bitmap_ind16 &bitmap, const rectangle &cliprect)
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{
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// quad objects
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for (int i = ARRAY_LENGTH(m_vdc.s.quad) - 1; i >= 0; i--)
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{
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@ -637,7 +641,7 @@ u32 i8244_device::screen_update(screen_device &screen, bitmap_ind16 &bitmap, con
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u16 color = 8 + ((m_vdc.s.quad[i].single[j].color >> 1) & 0x07);
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for (int cx = 0; cx < 8; cx++, x += 2)
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draw_char(4 * j + 16 * i + 0x40, x, scanline, BIT(m_charset[offset & 0x1ff], cx ^ 7), color, bitmap, cliprect);
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char_pixel(4 * j + 16 * i + 0x40, x, scanline, BIT(m_charset[offset & 0x1ff], cx ^ 7), color, bitmap, cliprect);
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}
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}
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}
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@ -659,11 +663,15 @@ u32 i8244_device::screen_update(screen_device &screen, bitmap_ind16 &bitmap, con
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int x = (m_vdc.s.foreground[i].x + 5) * 2;
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u16 color = 8 + ((m_vdc.s.foreground[i].color >> 1) & 0x07);
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for (int cx = 0; cx < 8; cx++, x += 2)
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draw_char(4 * i + 0x10, x, scanline, BIT(m_charset[offset & 0x1ff], cx ^ 7), color, bitmap, cliprect);
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char_pixel(4 * i + 0x10, x, scanline, BIT(m_charset[offset & 0x1ff], cx ^ 7), color, bitmap, cliprect);
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}
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}
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}
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// sprites
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void i8244_device::draw_minor(int scanline, bitmap_ind16 &bitmap, const rectangle &cliprect)
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{
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// minor system (sprites)
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for (int i = ARRAY_LENGTH(m_vdc.s.sprites) - 1; i >= 0; i--)
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{
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int y = m_vdc.s.sprites[i].y;
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@ -721,6 +729,29 @@ u32 i8244_device::screen_update(screen_device &screen, bitmap_ind16 &bitmap, con
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}
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}
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}
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}
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u32 i8244_device::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
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{
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// draw background color
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bitmap.fill(bitswap<3>(m_vdc.s.color,3,4,5), cliprect);
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for (int scanline = cliprect.min_y; scanline <= cliprect.max_y; scanline++)
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{
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// clear collision maps
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memset(m_collision_map, 0, sizeof(m_collision_map));
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memset(m_priority_map, 0, sizeof(m_priority_map));
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// display grid if enabled
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if (m_vdc.s.control & 0x08 && scanline >= 24 && scanline <= 218)
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draw_grid(scanline, bitmap, cliprect);
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// display objects if enabled
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if (m_vdc.s.control & 0x20 && scanline <= 242)
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{
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draw_major(scanline, bitmap, cliprect);
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draw_minor(scanline, bitmap, cliprect);
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}
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}
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@ -728,6 +759,10 @@ u32 i8244_device::screen_update(screen_device &screen, bitmap_ind16 &bitmap, con
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}
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/***************************************************************************
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SOUND
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***************************************************************************/
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void i8244_device::sound_stream_update(sound_stream &stream, std::vector<read_stream_view> const &inputs, std::vector<write_stream_view> &outputs)
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{
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u8 volume = m_vdc.s.sound & 0xf;
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@ -124,7 +124,10 @@ protected:
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offs_t fix_register_mirrors(offs_t offset);
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bool invalid_register(offs_t offset, bool rw);
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void draw_char(u8 index, int x, int y, u8 pixel, u16 color, bitmap_ind16 &bitmap, const rectangle &cliprect);
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void draw_grid(int scanline, bitmap_ind16 &bitmap, const rectangle &cliprect);
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void draw_major(int scanline, bitmap_ind16 &bitmap, const rectangle &cliprect);
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void draw_minor(int scanline, bitmap_ind16 &bitmap, const rectangle &cliprect);
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void char_pixel(u8 index, int x, int y, u8 pixel, u16 color, bitmap_ind16 &bitmap, const rectangle &cliprect);
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/* timers */
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static constexpr device_timer_id TIMER_VBLANK_START = 0;
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