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https://github.com/holub/mame
synced 2025-04-23 17:00:53 +03:00
(MESS) sms.c: Change hcount calculation to use screen timings and move it to the VDP. [Enik Land]
This commit is contained in:
Wilbert Pol
parent
34be6878ec
commit
335de9f804
@ -56,7 +56,7 @@ PAL frame timing
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#define VINT_HPOS 24
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#define VINT_FLAG_HPOS 23
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#define HINT_HPOS 25
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#define HINT_HPOS 26
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#define VCOUNT_CHANGE_HPOS 23
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#define SPROVR_HPOS 23
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#define SPRCOL_BASEHPOS 59
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@ -261,15 +261,22 @@ READ8_MEMBER( sega315_5124_device::vcount_read )
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}
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READ8_MEMBER( sega315_5124_device::hcount_latch_read )
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READ8_MEMBER( sega315_5124_device::hcount_read )
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{
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return m_hcounter;
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}
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WRITE8_MEMBER( sega315_5124_device::hcount_latch_write )
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void sega315_5124_device::hcount_latch_at_hpos( int hpos )
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{
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m_hcounter = data;
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/* The emulation core returns a screen hpos that is one position ahead in comparison
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with the expected VDP hclock value, if the same range is used (from 0 to width-1). */
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int hclock = hpos - 1;
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if (hclock < 0)
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hclock += m_screen->width();
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/* Calculate and write the new hcount. */
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m_hcounter = ((hclock - 46) >> 1) & 0xff;
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}
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@ -440,7 +447,7 @@ void sega315_5124_device::process_line_timer()
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m_tmpbitmap.fill(machine().pens[m_current_palette[BACKDROP_COLOR]], rec);
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m_y1_bitmap.fill(1, rec);
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select_sprites( vpos_limit, vpos - vpos_limit );
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select_sprites( vpos - vpos_limit );
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if ( m_draw_time > 0 )
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{
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m_draw_timer->adjust( m_screen->time_until_pos( vpos, m_draw_time ), vpos_limit );
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@ -475,7 +482,7 @@ void sega315_5124_device::process_line_timer()
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/* Draw middle of the border */
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/* We need to do this through the regular drawing function so it will */
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/* be included in the gamegear scaling functions */
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select_sprites( vpos_limit + m_frame_timing[TOP_BORDER], vpos - (vpos_limit + m_frame_timing[TOP_BORDER]) );
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select_sprites( vpos - (vpos_limit + m_frame_timing[TOP_BORDER]) );
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draw_scanline( SEGA315_5124_LBORDER_START + SEGA315_5124_LBORDER_WIDTH, vpos_limit + m_frame_timing[TOP_BORDER], vpos - (vpos_limit + m_frame_timing[TOP_BORDER]) );
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return;
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}
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@ -807,7 +814,7 @@ void sega315_5124_device::draw_scanline_mode4( int *line_buffer, int *priority_s
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pixel_plot_x = (0 - (x_scroll & 0x07) + (tile_column << 3) + pixel_plot_x);
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if (pixel_plot_x >= 0 && pixel_plot_x < 256)
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{
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// logerror("%x %x\n", pixel_plot_x + pixel_offset_x, pixel_plot_y);
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//logerror("%x %x\n", pixel_plot_x, line);
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line_buffer[pixel_plot_x] = m_current_palette[pen_selected];
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priority_selected[pixel_plot_x] = priority_select | (pen_selected & 0x0f);
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}
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@ -816,7 +823,7 @@ void sega315_5124_device::draw_scanline_mode4( int *line_buffer, int *priority_s
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}
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void sega315_5124_device::select_sprites( int pixel_plot_y, int line )
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void sega315_5124_device::select_sprites( int line )
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{
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int sprite_index = 0;
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int max_sprites = 0;
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@ -901,10 +908,10 @@ void sega315_5124_device::select_sprites( int pixel_plot_y, int line )
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}
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void sega315_5124_device::draw_sprites_mode4( int *line_buffer, int *priority_selected, int pixel_plot_y, int line )
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void sega315_5124_device::draw_sprites_mode4( int *line_buffer, int *priority_selected, int line )
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{
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bool sprite_col_occurred = false;
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int sprite_col_x = 1000;
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int sprite_col_x = m_screen->width();
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/* Draw sprite layer */
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@ -1059,10 +1066,10 @@ void sega315_5124_device::draw_sprites_mode4( int *line_buffer, int *priority_se
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}
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void sega315_5124_device::draw_sprites_tms9918_mode( int *line_buffer, int pixel_plot_y, int line )
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void sega315_5124_device::draw_sprites_tms9918_mode( int *line_buffer, int line )
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{
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bool sprite_col_occurred = false;
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int sprite_col_x = 1000;
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int sprite_col_x = m_screen->width();
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UINT16 sprite_pattern_base = ((m_reg[0x06] & 0x07) << 11);
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/* Draw sprite layer */
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@ -1355,7 +1362,7 @@ void sega315_5124_device::draw_scanline( int pixel_offset_x, int pixel_plot_y, i
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}
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if ( line >= 0 || ( line >= -13 && m_y_pixels == 192 ) )
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{
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draw_sprites_tms9918_mode( blitline_buffer, pixel_plot_y, line );
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draw_sprites_tms9918_mode( blitline_buffer, line );
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}
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break;
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@ -1367,7 +1374,7 @@ void sega315_5124_device::draw_scanline( int pixel_offset_x, int pixel_plot_y, i
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}
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if ( line >= 0 || ( line >= -13 && m_y_pixels == 192 ) )
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{
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draw_sprites_tms9918_mode( blitline_buffer, pixel_plot_y, line );
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draw_sprites_tms9918_mode( blitline_buffer, line );
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}
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break;
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@ -1380,7 +1387,7 @@ void sega315_5124_device::draw_scanline( int pixel_offset_x, int pixel_plot_y, i
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}
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if ( line >= 0 || ( line >= -13 && m_y_pixels == 192 ) )
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{
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draw_sprites_mode4( blitline_buffer, priority_selected, pixel_plot_y, line );
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draw_sprites_mode4( blitline_buffer, priority_selected, line );
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if ( line >= 0 )
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{
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/* Fill column 0 with overscan color from m_reg[0x07] */
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@ -1449,7 +1456,7 @@ void sega315_5378_device::draw_scanline( int pixel_offset_x, int pixel_plot_y, i
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}
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if ( line >= 0 || ( line >= -13 && m_y_pixels == 192 ) )
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{
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draw_sprites_tms9918_mode( blitline_buffer, pixel_plot_y, line );
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draw_sprites_tms9918_mode( blitline_buffer, line );
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}
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break;
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@ -1460,7 +1467,7 @@ void sega315_5378_device::draw_scanline( int pixel_offset_x, int pixel_plot_y, i
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}
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if ( line >= 0 || ( line >= -13 && m_y_pixels == 192 ) )
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{
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draw_sprites_tms9918_mode( blitline_buffer, pixel_plot_y, line );
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draw_sprites_tms9918_mode( blitline_buffer, line );
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}
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break;
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@ -1473,7 +1480,7 @@ void sega315_5378_device::draw_scanline( int pixel_offset_x, int pixel_plot_y, i
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}
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if ( line >= 0 || ( line >= -13 && m_y_pixels == 192 ) )
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{
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draw_sprites_mode4( blitline_buffer, priority_selected, pixel_plot_y, line );
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draw_sprites_mode4( blitline_buffer, priority_selected, line );
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if ( line >= 0 )
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{
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/* Fill column 0 with overscan color from m_reg[0x07] */
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@ -80,8 +80,10 @@ public:
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DECLARE_READ8_MEMBER( register_read );
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DECLARE_WRITE8_MEMBER( register_write );
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DECLARE_READ8_MEMBER( vcount_read );
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DECLARE_READ8_MEMBER( hcount_latch_read );
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DECLARE_WRITE8_MEMBER( hcount_latch_write );
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DECLARE_READ8_MEMBER( hcount_read );
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void hcount_latch() { hcount_latch_at_hpos( m_screen->hpos() ); };
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void hcount_latch_at_hpos( int hpos );
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bitmap_rgb32 &get_bitmap() { return m_tmpbitmap; };
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bitmap_ind8 &get_y1_bitmap() { return m_y1_bitmap; };
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@ -98,11 +100,11 @@ protected:
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virtual UINT16 get_name_table_address();
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void process_line_timer();
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void draw_scanline_mode4( int *line_buffer, int *priority_selected, int line );
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void draw_sprites_mode4( int *line_buffer, int *priority_selected, int pixel_plot_y, int line );
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void draw_sprites_tms9918_mode( int *line_buffer, int pixel_plot_y, int line );
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void draw_sprites_mode4( int *line_buffer, int *priority_selected, int line );
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void draw_sprites_tms9918_mode( int *line_buffer, int line );
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void draw_scanline_mode2( int *line_buffer, int line );
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void draw_scanline_mode0( int *line_buffer, int line );
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void select_sprites( int pixel_plot_y, int line );
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void select_sprites( int line );
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void check_pending_flags( int hpos );
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// device-level overrides
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@ -243,7 +243,7 @@ static INPUT_PORTS_START( sms )
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PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_X ) PORT_CROSSHAIR( X, 1.0, 0.0, 0 ) PORT_SENSITIVITY(50) PORT_KEYDELTA(15) PORT_PLAYER(2) PORT_CHANGED_MEMBER(DEVICE_SELF, sms_state, lgun2_changed, NULL) PORT_CONDITION("CTRLSEL", 0xf0, EQUALS, 0x10)
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PORT_START("LPHASER3") /* Light phaser Y - player 2 */
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PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_Y ) PORT_CROSSHAIR( Y, 1.0, 0.0, 0 ) PORT_SENSITIVITY(50) PORT_KEYDELTA(25) PORT_PLAYER(2) PORT_CHANGED_MEMBER(DEVICE_SELF, sms_state, lgun2_changed, NULL) PORT_CONDITION("CTRLSEL", 0xf0, EQUALS, 0x10)
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PORT_BIT( 0xff, 0x80, IPT_LIGHTGUN_Y ) PORT_CROSSHAIR( Y, 1.0, 0.0, 0 ) PORT_SENSITIVITY(50) PORT_KEYDELTA(15) PORT_PLAYER(2) PORT_CHANGED_MEMBER(DEVICE_SELF, sms_state, lgun2_changed, NULL) PORT_CONDITION("CTRLSEL", 0xf0, EQUALS, 0x10)
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PORT_START("RFU") /* Rapid Fire Unit */
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PORT_CONFNAME( 0x03, 0x00, "Rapid Fire Unit - Player 1" )
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@ -216,14 +216,12 @@ protected:
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required_shared_ptr<UINT8> m_mainram;
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void setup_rom();
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void vdp_hcount_lphaser(int hpos);
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void lphaser_hcount_latch(int hpos);
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void lphaser1_sensor_check();
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void lphaser2_sensor_check();
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UINT16 screen_hpos_nonscaled(int scaled_hpos);
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UINT16 screen_vpos_nonscaled(int scaled_vpos);
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int lgun_bright_aim_area(emu_timer *timer, int lgun_x, int lgun_y);
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void sms_vdp_hcount_latch(address_space &space);
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UINT8 sms_vdp_hcount();
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void setup_cart_banks();
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void setup_banks();
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void sms_get_inputs(address_space &space);
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@ -279,18 +279,6 @@ WRITE8_MEMBER(sms_state::sms_input_write)
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}
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}
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/* FIXME: this function is a hack for Light Phaser emulation. Theoretically
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sms_vdp_hcount_latch() should be used instead, but it returns incorrect
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position for unknown reason (timing?) */
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void sms_state::vdp_hcount_lphaser( int hpos )
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{
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int hpos_tmp = hpos + m_lphaser_x_offs;
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UINT8 tmp = ((hpos_tmp - 46) >> 1) & 0xff;
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//printf ("sms_vdp_hcount_lphaser: hpos %3d hpos_tmp %3d => hcount %2X\n", hpos, hpos_tmp, tmp);
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m_vdp->hcount_latch_write(*m_space, 0, tmp);
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}
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/*
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Light Phaser (light gun) emulation notes:
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@ -323,12 +311,13 @@ int sms_state::lgun_bright_aim_area( emu_timer *timer, int lgun_x, int lgun_y )
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int dx, dy;
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int result = 0;
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int pos_changed = 0;
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double dx_circ;
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double dx_radius;
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while (1)
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{
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/* If beam's y isn't at a line where the aim area is, change it
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the next line it enters that area. */
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dy = abs(beam_y - lgun_y);
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if (dy > LGUN_RADIUS || beam_y < visarea.min_y || beam_y > visarea.max_y)
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{
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beam_y = lgun_y - LGUN_RADIUS;
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@ -337,21 +326,38 @@ int sms_state::lgun_bright_aim_area( emu_timer *timer, int lgun_x, int lgun_y )
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dy = abs(beam_y - lgun_y);
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pos_changed = 1;
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}
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/* step 1: r^2 = dx^2 + dy^2 */
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/* step 2: dx^2 = r^2 - dy^2 */
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/* step 3: dx = sqrt(r^2 - dy^2) */
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dx_circ = ceil((float) sqrt((float) (r_x_r - (dy * dy))));
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dx = abs(beam_x - lgun_x);
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if (dx > dx_circ || beam_x < visarea.min_x || beam_x > visarea.max_x)
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/* Caculate distance in x of the radius, relative to beam's y distance.
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First try some shortcuts. */
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switch (dy)
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{
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case LGUN_RADIUS:
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dx_radius = 0;
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break;
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case 0:
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dx_radius = LGUN_RADIUS;
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break;
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default:
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/* step 1: r^2 = dx^2 + dy^2 */
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/* step 2: dx^2 = r^2 - dy^2 */
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/* step 3: dx = sqrt(r^2 - dy^2) */
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dx_radius = ceil((float) sqrt((float) (r_x_r - (dy * dy))));
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}
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/* If beam's x isn't in the circular aim area, change it
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to the next point it enters that area. */
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dx = abs(beam_x - lgun_x);
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if (dx > dx_radius || beam_x < visarea.min_x || beam_x > visarea.max_x)
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{
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/* If beam's x has passed the aim area, advance to
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next line and recheck y/x coordinates. */
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if (beam_x > lgun_x)
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{
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beam_x = 0;
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beam_y++;
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continue;
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}
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beam_x = lgun_x - dx_circ;
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beam_x = lgun_x - dx_radius;
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if (beam_x < visarea.min_x)
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beam_x = visarea.min_x;
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pos_changed = 1;
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@ -389,45 +395,19 @@ int sms_state::lgun_bright_aim_area( emu_timer *timer, int lgun_x, int lgun_y )
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return result;
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}
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UINT8 sms_state::sms_vdp_hcount()
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void sms_state::lphaser_hcount_latch( int hpos )
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{
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UINT64 cycles_per_line;
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attotime line_remaining_time;
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UINT64 line_remaining_cycles;
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UINT64 line_elapsed_cycles;
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/* Calculate amount of CPU cycles according to screen references.
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If some day the screen become always synced to the CPU, in the
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proportion of their speeds, this may be replaced by the screen
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hpos position only and the function be moved to the VDP file. */
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cycles_per_line = m_main_cpu->attotime_to_clocks(m_main_scr->scan_period());
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line_remaining_time = m_main_scr->time_until_pos(m_main_scr->vpos(), m_main_scr->width());
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line_remaining_cycles = m_main_cpu->attotime_to_clocks(line_remaining_time) % cycles_per_line;
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line_elapsed_cycles = cycles_per_line - line_remaining_cycles;
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/* HCount equation, being hpos = VDP hclocks: "(hpos - 47) / 2"
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Screen hpos based on CPU cycles: "cycles * width / cycles per line"
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Do both in same line for one-step rounding only (required). */
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return ((line_elapsed_cycles * m_main_scr->width() / cycles_per_line) - 47) / 2;
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/* Alternative hcount equation, restricted to the SMS clock:
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"(590 - (line_remaining_cycles * 3)) / 4"
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Posted by Flubba on SMSPower forum. */
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}
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void sms_state::sms_vdp_hcount_latch( address_space &space )
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{
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UINT8 value = sms_vdp_hcount();
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m_vdp->hcount_latch_write(space, 0, value);
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/* A delay seems to occur when the Light Phaser latches the
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VDP hcount, then an offset is added here to the hpos. */
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m_vdp->hcount_latch_at_hpos(hpos + m_lphaser_x_offs);
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}
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UINT16 sms_state::screen_hpos_nonscaled(int scaled_hpos)
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{
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const rectangle &visarea = m_main_scr->visible_area();
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int offset_x = (scaled_hpos * visarea.width()) / 255;
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int offset_x = (scaled_hpos * (visarea.max_x - visarea.min_x)) / 255;
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return visarea.min_x + offset_x;
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}
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@ -450,7 +430,7 @@ void sms_state::lphaser1_sensor_check()
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if (m_lphaser_1_latch == 0)
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{
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m_lphaser_1_latch = 1;
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vdp_hcount_lphaser(x);
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lphaser_hcount_latch(x);
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}
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}
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}
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@ -465,7 +445,7 @@ void sms_state::lphaser2_sensor_check()
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if (m_lphaser_2_latch == 0)
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{
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m_lphaser_2_latch = 1;
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vdp_hcount_lphaser(x);
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lphaser_hcount_latch(x);
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}
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}
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}
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@ -573,13 +553,13 @@ void sms_state::sms_get_inputs( address_space &space )
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case 0x01: /* Light Phaser */
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data = (ioport("CTRLIPT")->read() & 0x01) << 4;
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if (!(data & 0x10))
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{
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if (ioport("RFU")->read() & 0x01)
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data |= m_rapid_fire_state_1 & 0x10;
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}
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/* just consider the button (trigger) bit */
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/* Check Rapid Fire setting for Trigger */
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if (!(data & 0x10) && (ioport("RFU")->read() & 0x01))
|
||||
data |= m_rapid_fire_state_1 & 0x10;
|
||||
|
||||
/* just consider the trigger (button) bit */
|
||||
data |= ~0x10;
|
||||
|
||||
m_input_port0 = (m_input_port0 & 0xc0) | (data & 0x3f);
|
||||
break;
|
||||
|
||||
@ -635,13 +615,13 @@ void sms_state::sms_get_inputs( address_space &space )
|
||||
|
||||
case 0x10: /* Light Phaser */
|
||||
data = (ioport("CTRLIPT")->read() & 0x10) >> 2;
|
||||
if (!(data & 0x04))
|
||||
{
|
||||
if (ioport("RFU")->read() & 0x04)
|
||||
data |= m_rapid_fire_state_2 & 0x04;
|
||||
}
|
||||
/* just consider the button (trigger) bit */
|
||||
/* Check Rapid Fire setting for Trigger */
|
||||
if (!(data & 0x04) && (ioport("RFU")->read() & 0x04))
|
||||
data |= m_rapid_fire_state_2 & 0x04;
|
||||
|
||||
/* just consider the trigger (button) bit */
|
||||
data |= ~0x04;
|
||||
|
||||
m_input_port1 = (m_input_port1 & 0xf0) | (data & 0x0f);
|
||||
break;
|
||||
|
||||
@ -708,14 +688,14 @@ READ8_MEMBER(sms_state::sms_fm_detect_r)
|
||||
|
||||
WRITE8_MEMBER(sms_state::sms_io_control_w)
|
||||
{
|
||||
bool hcount_latch = false;
|
||||
bool latch_hcount = false;
|
||||
|
||||
if (data & 0x08)
|
||||
{
|
||||
/* check if TH pin level is high (1) and was low last time */
|
||||
if (data & 0x80 && !(m_ctrl_reg & 0x80))
|
||||
{
|
||||
hcount_latch = true;
|
||||
latch_hcount = true;
|
||||
}
|
||||
sms_input_write(space, 0, (data & 0x20) >> 5);
|
||||
}
|
||||
@ -724,14 +704,14 @@ WRITE8_MEMBER(sms_state::sms_io_control_w)
|
||||
{
|
||||
if (data & 0x20 && !(m_ctrl_reg & 0x20))
|
||||
{
|
||||
hcount_latch = true;
|
||||
latch_hcount = true;
|
||||
}
|
||||
sms_input_write(space, 1, (data & 0x80) >> 7);
|
||||
}
|
||||
|
||||
if (hcount_latch)
|
||||
if (latch_hcount)
|
||||
{
|
||||
sms_vdp_hcount_latch(space);
|
||||
m_vdp->hcount_latch();
|
||||
}
|
||||
|
||||
m_ctrl_reg = data;
|
||||
@ -741,7 +721,7 @@ WRITE8_MEMBER(sms_state::sms_io_control_w)
|
||||
READ8_MEMBER(sms_state::sms_count_r)
|
||||
{
|
||||
if (offset & 0x01)
|
||||
return m_vdp->hcount_latch_read(*m_space, offset);
|
||||
return m_vdp->hcount_read(*m_space, offset);
|
||||
else
|
||||
return m_vdp->vcount_read(*m_space, offset);
|
||||
}
|
||||
@ -1531,22 +1511,22 @@ int sms_state::detect_lphaser_xoffset( UINT8 *rom )
|
||||
if (!(m_bios_port & IO_CARTRIDGE) && m_cartridge[m_current_cartridge].size >= 0x8000)
|
||||
{
|
||||
if (!memcmp(&rom[0x7ff0], signatures[0], 16) || !memcmp(&rom[0x7ff0], signatures[1], 16))
|
||||
return 40;
|
||||
return 41;
|
||||
|
||||
if (!memcmp(&rom[0x7ff0], signatures[2], 16))
|
||||
return 49;
|
||||
return 50;
|
||||
|
||||
if (!memcmp(&rom[0x7ff0], signatures[3], 16))
|
||||
return 47;
|
||||
return 48;
|
||||
|
||||
if (!memcmp(&rom[0x7ff0], signatures[4], 16))
|
||||
return 44;
|
||||
return 45;
|
||||
|
||||
if (!memcmp(&rom[0x7ff0], signatures[5], 16))
|
||||
return 53;
|
||||
return 54;
|
||||
|
||||
}
|
||||
return 50;
|
||||
return 51;
|
||||
}
|
||||
|
||||
|
||||
@ -2260,9 +2240,7 @@ UINT32 sms_state::screen_update_sms(screen_device &screen, bitmap_rgb32 &bitmap,
|
||||
|
||||
VIDEO_START_MEMBER(sms_state,gamegear)
|
||||
{
|
||||
screen_device *screen = machine().first_screen();
|
||||
|
||||
screen->register_screen_bitmap(m_prev_bitmap);
|
||||
m_main_scr->register_screen_bitmap(m_prev_bitmap);
|
||||
save_item(NAME(m_prev_bitmap));
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user