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315_5124.c: Improvement to timing for calculating flags. Fixes random hangs in gamegear 'roboterm' and flickering in gamegear 'evander'. [Enik Land]

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This commit is contained in:
Wilbert Pol 2014-04-29 19:16:59 +00:00
parent df7075c189
commit e51f93187c
2 changed files with 26 additions and 12 deletions
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35
src/emu/video/315_5124.c
View File

@ -70,12 +70,10 @@ PAL frame timing
#define SPROVR_HPOS 23
#define SPRCOL_BASEHPOS 59
#define X_SCROLL_HPOS 21
#define DISPLAY_DISABLED_HPOS 17 /* fixes 'fantdizzy' (SMS PAL game) flicker */
#define DISPLAY_CB_HPOS 0
/* Display callback delay that fixes a flicker issue at top of screen when
playing 'fantdizzy' (SMS PAL game), due to time when display is disabled. */
#define DISPLAY_CB_HPOS 6
#define DRAW_TIME_GG 86 /* 1 + 2 + 14 + 8 + 96/2 */
#define DRAW_TIME_GG 86 /* 1 + 2 + 14 + 8 + 122/2 */
#define DRAW_TIME_SMS 25 /* 1 + 2 + 14 + 8 */
#define PRIORITY_BIT 0x1000
@ -368,9 +366,6 @@ void sega315_5124_device::process_line_timer()
m_display_disabled = !(m_reg[0x01] & 0x40);
/* Activate flags that were pending until the end of previous line. */
check_pending_flags(m_screen->width());
/* Check if we're on the last line of a frame */
if (vpos == vpos_limit - 1)
{
@ -546,8 +541,21 @@ READ8_MEMBER( sega315_5124_device::vram_read )
}
void sega315_5124_device::check_pending_flags( int hpos )
void sega315_5124_device::check_pending_flags()
{
const attotime current_time = machine().time();
int hpos;
if (current_time < m_line_end_time)
{
hpos = m_screen->hpos();
}
else
{
hpos = m_screen->width();
m_line_end_time = current_time + m_screen->time_until_pos(m_screen->vpos(), hpos);
}
if ((m_pending_status & STATUS_HINT) && hpos >= HINT_HPOS)
{
m_pending_status &= ~STATUS_HINT;
@ -576,7 +584,7 @@ READ8_MEMBER( sega315_5124_device::register_read )
{
UINT8 temp;
check_pending_flags(m_screen->hpos());
check_pending_flags();
temp = m_status;
if ( !space.debugger_access() )
@ -631,7 +639,7 @@ WRITE8_MEMBER( sega315_5124_device::register_write )
int reg_num;
int hpos = m_screen->hpos();
check_pending_flags(hpos);
check_pending_flags();
if (m_pending_reg_write == 0)
{
@ -665,6 +673,9 @@ WRITE8_MEMBER( sega315_5124_device::register_write )
if (reg_num == 0 || reg_num == 1)
set_display_settings();
if (reg_num == 1 && hpos <= DISPLAY_DISABLED_HPOS)
m_display_disabled = !(m_reg[0x01] & 0x40);
if (reg_num == 8 && hpos <= X_SCROLL_HPOS)
m_reg8copy = m_reg[0x08];
@ -1815,6 +1826,7 @@ void sega315_5124_device::device_start()
save_item(NAME(m_tmpbitmap));
save_item(NAME(m_y1_bitmap));
save_item(NAME(m_draw_time));
save_item(NAME(m_line_end_time));
save_item(NAME(m_sprite_base));
save_item(NAME(m_selected_sprite));
save_item(NAME(m_sprite_count));
@ -1853,6 +1865,7 @@ void sega315_5124_device::device_reset()
m_line_counter = 0;
m_hcounter = 0;
m_draw_time = DRAW_TIME_SMS;
m_line_end_time = machine().time() + m_screen->time_until_pos(m_screen->vpos(), m_screen->width());
for (i = 0; i < 0x20; i++)
m_current_palette[i] = 0;

3
src/emu/video/315_5124.h
View File

@ -99,7 +99,7 @@ protected:
void draw_scanline_mode2( int *line_buffer, int line );
void draw_scanline_mode0( int *line_buffer, int line );
void select_sprites( int line );
void check_pending_flags( int hpos );
void check_pending_flags();
// device-level overrides
virtual void device_start();
@ -129,6 +129,7 @@ protected:
int m_vdp_mode; /* Current mode of the VDP: 0,1,2,3,4 */
int m_y_pixels; /* 192, 224, 240 */
int m_draw_time;
attotime m_line_end_time;
UINT8 m_line_counter;
UINT8 m_hcounter;
memory_region *m_CRAM; /* Pointer to CRAM */