MAME SVN History

199869 Revisions

r32004 Monday 8th September, 2014 at 19:54:21 UTC by Wilbert Pol
(MESS) sms.c: Prevent vdp register 6 contents from being overwritten while a line is being drawn. Fixes title screen in backtof3. [Enik Land, Wilbert Pol]

[src/emu/video]

315_5124.c 315_5124.h

trunk/src/emu/video/315_5124.c
r32003	r32004
156	156	, m_cram_size( SEGA315_5124_CRAM_SIZE )
157	157	, m_palette_offset( 0 )
158	158	, m_supports_224_240( false )
	159	, m_latched_reg6(0)
159	160	, m_is_pal(false)
160	161	, m_int_cb(*this)
161	162	, m_pause_cb(*this)
r32003	r32004
172	173	, m_cram_size( cram_size )
173	174	, m_palette_offset( palette_offset )
174	175	, m_supports_224_240( supports_224_240 )
	176	, m_latched_reg6(0)
175	177	, m_is_pal(false)
176	178	, m_int_cb(*this)
177	179	, m_pause_cb(*this)
r32003	r32004
367	369	m_int_cb(ASSERT_LINE);
368	370	}
369	371	}
	372	m_latched_reg6 = m_reg[0x06];
370	373	break;
371	374
372	375	case TIMER_VINT:
r32003	r32004
465	468	if (m_line_counter == 0x00)
466	469	{
467	470	m_line_counter = m_reg[0x0a];
468		m_hint_timer->adjust( m_screen->time_until_pos( vpos, HINT_HPOS ) );
469	471	m_pending_status \|= STATUS_HINT;
470	472	}
471	473	else
472	474	{
473	475	m_line_counter--;
474	476	}
	477	m_hint_timer->adjust( m_screen->time_until_pos( vpos, HINT_HPOS ) );
475	478
476	479	/* Draw borders */
477	480	m_lborder_timer->adjust( m_screen->time_until_pos( vpos, SEGA315_5124_LBORDER_START ), vpos );
r32003	r32004
977	980	sprite_x -= 0x08; /* sprite shift */
978	981	}
979	982
980		if (m_reg~~[0x0~~6] & 0x04)
	983	if (m_latched_reg6 & 0x04)
981	984	{
982	985	sprite_tile_selected += 256; /* pattern table select */
983	986	}
r32003	r32004
1109	1112	{
1110	1113	bool sprite_col_occurred = false;
1111	1114	int sprite_col_x = m_screen->width();
1112		UINT16 sprite_pattern_base = ((m_reg~~[0x0~~6] & 0x07) << 11);
	1115	UINT16 sprite_pattern_base = ((m_latched_reg6 & 0x07) << 11);
1113	1116
1114	1117	if (m_display_disabled)
1115	1118	return;

trunk/src/emu/video/315_5124.h
r32003	r32004
144	144	int m_sprite_count;
145	145	int m_sprite_height;
146	146	int m_sprite_zoom;
	147	UINT8 m_latched_reg6;
147	148
148	149	/* line_buffer will be used to hold 5 lines of line data. Line #0 is the regular blitting area.
149	150	Lines #1-#4 will be used as a kind of cache to be used for vertical scaling in the gamegear

199869 Revisions