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r32028 Tuesday 9th September, 2014 at 18:28:17 UTC by Wilbert Pol
(MESS) sms.c: Fixed graphics glitch in E-Swat atttact mode on the smsj driver and some small cleanups. [Enik Land]
[src/emu/video]315_5124.c 315_5124.h

trunk/src/emu/video/315_5124.c
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197197
198198void sega315_5124_device::set_display_settings()
199199{
200   bool M1 = m_reg[0x01] & 0x10;
201   bool M2 = m_reg[0x00] & 0x02;
202   bool M3 = m_reg[0x01] & 0x08;
203   bool M4 = m_reg[0x00] & 0x04;
200   const bool M1 = m_reg[0x01] & 0x10;
201   const bool M2 = m_reg[0x00] & 0x02;
202   const bool M3 = m_reg[0x01] & 0x08;
203   const bool M4 = m_reg[0x00] & 0x04;
204204
205205   m_y_pixels = 192;
206206
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274274
275275READ8_MEMBER( sega315_5124_device::vcount_read )
276276{
277   const int active_scr_start = m_frame_timing[VERTICAL_BLANKING] + m_frame_timing[TOP_BLANKING] + m_frame_timing[TOP_BORDER];
277278   int vpos = m_screen->vpos();
278   int active_scr_start = m_frame_timing[VERTICAL_BLANKING] + m_frame_timing[TOP_BLANKING] + m_frame_timing[TOP_BORDER];
279279
280280   if (m_screen->hpos() < VCOUNT_CHANGE_HPOS)
281281   {
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296296
297297void sega315_5124_device::hcount_latch_at_hpos( int hpos )
298298{
299   const int active_scr_start = 46;      /* 9 + 2 + 14 + 8 + 13 */
300
299301   /* The emulation core returns a screen hpos that is one position ahead in comparison
300302      with the expected VDP hclock value, if the same range is used (from 0 to width-1). */
301303   int hclock = hpos - 1;
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303305      hclock += m_screen->width();
304306
305307   /* Calculate and store the new hcount. */
306   m_hcounter = ((hclock - 46) >> 1) & 0xff;
308   m_hcounter = ((hclock - active_scr_start) >> 1) & 0xff;
307309}
308310
309311
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323325      process_line_timer();
324326      break;
325327
328   case TIMER_FLAGS:
329      /* Activate flags that were pending until the end of the line. */
330      check_pending_flags();
331      break;
332
326333   case TIMER_DRAW:
327334      update_palette();
328335      draw_scanline( SEGA315_5124_LBORDER_START + SEGA315_5124_LBORDER_WIDTH, param, m_screen->vpos() - param );
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395402
396403void sega315_5124_device::process_line_timer()
397404{
398   int vpos = m_screen->vpos();
405   const int vpos = m_screen->vpos();
399406   int vpos_limit = m_frame_timing[VERTICAL_BLANKING] + m_frame_timing[TOP_BLANKING]
400407               + m_frame_timing[TOP_BORDER] + m_frame_timing[ACTIVE_DISPLAY_V]
401408               + m_frame_timing[BOTTOM_BORDER] + m_frame_timing[BOTTOM_BLANKING];
402409
403410   m_display_disabled = !(m_reg[0x01] & 0x40);
404411
405   /* Activate flags that were pending until the end of previous line. */
406   check_pending_flags();
407
408412   vpos_limit -= m_frame_timing[BOTTOM_BLANKING];
409413
410414   /* Check if we're below the bottom border */
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550554      return;
551555   }
552556
553   hpos = m_screen->hpos();
554   if (hpos < DISPLAY_CB_HPOS || m_display_timer->remaining() == attotime::zero)
557   /* A timer ensures that this function will run at least at end of each line.
558      When this function runs through a CPU instruction executed when the timer
559      was about to fire, the time added in the CPU timeslice may make hpos()
560      return some position in the begining of next line. To ensure the instruction
561      will get updated status, here a maximum hpos is set if the timer reports no
562      remaining time, what could also occur due to the ahead time of the timeslice. */
563   if (m_pending_flags_timer->remaining() == attotime::zero)
555564   {
556      hpos = m_screen->width();
565      hpos = m_screen->width() - 1;
557566   }
567   else
568   {
569      hpos = m_screen->hpos();
570   }
558571
559572   if ((m_pending_status & STATUS_HINT) && hpos >= HINT_HPOS)
560573   {
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785798void sega315_5124_device::draw_scanline_mode4( int *line_buffer, int *priority_selected, int line )
786799{
787800   int tile_column;
788   int x_scroll, y_scroll, x_scroll_start_column;
801   int y_scroll;
789802   int pixel_x, pixel_plot_x;
790803   int bit_plane_0, bit_plane_1, bit_plane_2, bit_plane_3;
791   int scroll_mod = ( m_y_pixels != 192 ) ? 256 : 224;
792   UINT16 name_table_address = get_name_table_address();
804   const int scroll_mod = ( m_y_pixels != 192 ) ? 256 : 224;
805   const UINT16 name_table_address = get_name_table_address();
793806
794807   /* if top 2 rows of screen not affected by horizontal scrolling, then x_scroll = 0 */
795808   /* else x_scroll = m_reg8copy                                                      */
796   x_scroll = (((m_reg[0x00] & 0x40) && (line < 16)) ? 0 : 0x0100 - m_reg8copy);
809   const int x_scroll = (((m_reg[0x00] & 0x40) && (line < 16)) ? 0 : 0x0100 - m_reg8copy);
797810
798   x_scroll_start_column = (x_scroll >> 3);             /* x starting column tile */
811   const int x_scroll_start_column = (x_scroll >> 3);             /* x starting column tile */
799812
800813   /* Draw background layer */
801814   for (tile_column = 0; tile_column < 33; tile_column++)
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863876
864877void sega315_5124_device::select_sprites( int line )
865878{
866   int sprite_index = 0;
867   int max_sprites = 0;
879   int max_sprites;
868880
869881   m_sprite_count = 0;
870   m_sprite_base = ((m_reg[0x05] << 7) & 0x3f00);
871882
872883   if ( m_vdp_mode == 0 || m_vdp_mode == 2 )
873884   {
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883894      if (m_reg[0x01] & 0x01)                         /* Check if MAG is set */
884895         m_sprite_height = m_sprite_height * 2;
885896
886      for (sprite_index = 0; (sprite_index < 32 * 4) && (m_sprite_count <= max_sprites); sprite_index += 4)
897      for (int sprite_index = 0; (sprite_index < 32 * 4) && (m_sprite_count <= max_sprites); sprite_index += 4)
887898      {
888899         int sprite_y = space().read_byte(m_sprite_base + sprite_index);
889900         if (sprite_y == 0xd0)
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915926      m_sprite_height = (m_reg[0x01] & 0x02) ? 16 : 8;
916927      m_sprite_zoom = (m_reg[0x01] & 0x01) ? 2 : 1;
917928
918      for (sprite_index = 0; (sprite_index < 64) && (m_sprite_count <= max_sprites); sprite_index++)
929      for (int sprite_index = 0; (sprite_index < 64) && (m_sprite_count <= max_sprites); sprite_index++)
919930      {
920931         int sprite_y = space().read_byte(m_sprite_base + sprite_index);
921932         if (m_y_pixels == 192 && sprite_y == 0xd0)
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11121123{
11131124   bool sprite_col_occurred = false;
11141125   int sprite_col_x = m_screen->width();
1115   UINT16 sprite_pattern_base = ((m_latched_reg6 & 0x07) << 11);
1126   const UINT16 sprite_pattern_base = ((m_latched_reg6 & 0x07) << 11);
11161127
11171128   if (m_display_disabled)
11181129      return;
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17471758void sega315_5124_device::stop_timers()
17481759{
17491760   m_display_timer->adjust(attotime::never);
1761   m_pending_flags_timer->adjust(attotime::never);
17501762   m_hint_timer->adjust(attotime::never);
17511763   m_vint_timer->adjust(attotime::never);
17521764   m_nmi_timer->adjust(attotime::never);
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17961808
17971809   m_display_timer = timer_alloc(TIMER_LINE);
17981810   m_display_timer->adjust(m_screen->time_until_pos(0, DISPLAY_CB_HPOS), 0, m_screen->scan_period());
1811   m_pending_flags_timer = timer_alloc(TIMER_FLAGS);
1812   m_pending_flags_timer->adjust(m_screen->time_until_pos(0, m_screen->width() - 1), 0, m_screen->scan_period());
17991813   m_draw_timer = timer_alloc(TIMER_DRAW);
18001814   m_lborder_timer = timer_alloc(TIMER_LBORDER);
18011815   m_rborder_timer = timer_alloc(TIMER_RBORDER);
trunk/src/emu/video/315_5124.h
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161161   emu_timer        *m_draw_timer;
162162   emu_timer        *m_lborder_timer;
163163   emu_timer        *m_rborder_timer;
164   emu_timer        *m_pending_flags_timer;
164165
165166   const address_space_config  m_space_config;
166167
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172173   static const device_timer_id TIMER_HINT = 4;
173174   static const device_timer_id TIMER_VINT = 5;
174175   static const device_timer_id TIMER_NMI = 6;
176   static const device_timer_id TIMER_FLAGS = 7;
175177
176178   required_device<palette_device> m_palette;
177179};

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