Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-07-05 18:08:04 +03:00
Code Issues Actions 36 Packages Projects Releases Wiki Activity

(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]

Browse Source
This commit is contained in:
Wilbert Pol 2014-09-08 19:54:21 +00:00
parent 54bdec4eef
commit 63afa61876
2 changed files with 7 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
src/emu/video/315_5124.c
View File

@ -156,6 +156,7 @@ sega315_5124_device::sega315_5124_device(const machine_config &mconfig, const ch
, m_cram_size( SEGA315_5124_CRAM_SIZE )
, m_palette_offset( 0 )
, m_supports_224_240( false )
, m_latched_reg6(0)
, m_is_pal(false)
, m_int_cb(*this)
, m_pause_cb(*this)
@ -172,6 +173,7 @@ sega315_5124_device::sega315_5124_device(const machine_config &mconfig, device_t
, m_cram_size( cram_size )
, m_palette_offset( palette_offset )
, m_supports_224_240( supports_224_240 )
, m_latched_reg6(0)
, m_is_pal(false)
, m_int_cb(*this)
, m_pause_cb(*this)
@ -367,6 +369,7 @@ void sega315_5124_device::device_timer(emu_timer &timer, device_timer_id id, int
m_int_cb(ASSERT_LINE);
}
}
m_latched_reg6 = m_reg[0x06];
break;
case TIMER_VINT:
@ -465,13 +468,13 @@ void sega315_5124_device::process_line_timer()
if (m_line_counter == 0x00)
{
m_line_counter = m_reg[0x0a];
m_hint_timer->adjust( m_screen->time_until_pos( vpos, HINT_HPOS ) );
m_pending_status |= STATUS_HINT;
}
else
{
m_line_counter--;
}
m_hint_timer->adjust( m_screen->time_until_pos( vpos, HINT_HPOS ) );
/* Draw borders */
m_lborder_timer->adjust( m_screen->time_until_pos( vpos, SEGA315_5124_LBORDER_START ), vpos );
@ -977,7 +980,7 @@ void sega315_5124_device::draw_sprites_mode4( int *line_buffer, int *priority_se
sprite_x -= 0x08; /* sprite shift */
}
if (m_reg[0x06] & 0x04)
if (m_latched_reg6 & 0x04)
{
sprite_tile_selected += 256; /* pattern table select */
}
@ -1109,7 +1112,7 @@ void sega315_5124_device::draw_sprites_tms9918_mode( int *line_buffer, int line
{
bool sprite_col_occurred = false;
int sprite_col_x = m_screen->width();
UINT16 sprite_pattern_base = ((m_reg[0x06] & 0x07) << 11);
UINT16 sprite_pattern_base = ((m_latched_reg6 & 0x07) << 11);
if (m_display_disabled)
return;

1
src/emu/video/315_5124.h
View File

@ -144,6 +144,7 @@ protected:
int m_sprite_count;
int m_sprite_height;
int m_sprite_zoom;
UINT8 m_latched_reg6;
/* line_buffer will be used to hold 5 lines of line data. Line #0 is the regular blitting area.
Lines #1-#4 will be used as a kind of cache to be used for vertical scaling in the gamegear