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mc6847 optimizations

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This commit is contained in:
Nathan Woods 2013-03-30 12:08:26 +00:00
parent 30a47526e2
commit 0deff571ba
1 changed files with 22 additions and 15 deletions
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37
src/emu/video/mc6847.c
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@ -221,17 +221,21 @@ void mc6847_friend_device::device_post_load(void)
// update_field_sync_timer // update_field_sync_timer
//------------------------------------------------- //-------------------------------------------------
void mc6847_friend_device::update_field_sync_timer(void) ATTR_FORCE_INLINE void mc6847_friend_device::update_field_sync_timer(void)
{ {
/* are we expecting field sync? */ // are we expecting field sync?
bool expected_field_sync = (m_physical_scanline < m_field_sync_falling_edge_scanline) bool expected_field_sync = (m_physical_scanline < m_field_sync_falling_edge_scanline)
|| (m_logical_scanline_zone == SCANLINE_ZONE_VBLANK); || (m_logical_scanline_zone == SCANLINE_ZONE_VBLANK);
/* determine the duration */ // do we need to adjust the timer?
attotime duration = (expected_field_sync != m_field_sync) ? attotime::from_ticks(160, m_clock) : attotime::never; if (expected_field_sync != m_field_sync)
{
// if so, determine the duration
attotime duration = attotime::from_ticks(160, m_clock);
/* and reset the timer */ // and reset the timer
m_fsync_timer->adjust(duration, expected_field_sync ? 1 : 0); m_fsync_timer->adjust(duration, expected_field_sync ? 1 : 0);
}
} }
@ -297,12 +301,14 @@ const char *mc6847_friend_device::scanline_zone_string(scanline_zone zone)
ATTR_FORCE_INLINE void mc6847_friend_device::change_horizontal_sync(bool line) ATTR_FORCE_INLINE void mc6847_friend_device::change_horizontal_sync(bool line)
{ {
g_profiler.start(PROFILER_USER1); g_profiler.start(PROFILER_USER1);
// are we on a rising edge?
if (line && !m_horizontal_sync) if (line && !m_horizontal_sync)
{ {
if (LOG_SCANLINE) if (LOG_SCANLINE)
logerror("%s: change_horizontal_sync(): Recording scanline\n", describe_context()); logerror("%s: change_horizontal_sync(): Recording scanline\n", describe_context());
/* first store the scanline */ // first store the scanline
g_profiler.start(PROFILER_USER2); g_profiler.start(PROFILER_USER2);
switch((scanline_zone) m_logical_scanline_zone) switch((scanline_zone) m_logical_scanline_zone)
{ {
@ -323,34 +329,35 @@ ATTR_FORCE_INLINE void mc6847_friend_device::change_horizontal_sync(bool line)
case SCANLINE_ZONE_RETRACE: case SCANLINE_ZONE_RETRACE:
case SCANLINE_ZONE_VBLANK: case SCANLINE_ZONE_VBLANK:
case SCANLINE_ZONE_FRAME_END: case SCANLINE_ZONE_FRAME_END:
/* do nothing */ // do nothing
break; break;
} }
g_profiler.stop(); g_profiler.stop();
/* advance to next scanline */ // advance to next scanline
next_scanline(); next_scanline();
// and update the field sync timer
update_field_sync_timer();
} }
/* finally output horizontal sync */ // finally output horizontal sync
if (line != m_horizontal_sync) if (line != m_horizontal_sync)
{ {
m_horizontal_sync = line; m_horizontal_sync = line;
/* log if apprpriate */ // log if apprpriate
if (LOG_HSYNC) if (LOG_HSYNC)
logerror("%s: change_horizontal_sync(): line=%d\n", describe_context(), line ? 1 : 0); logerror("%s: change_horizontal_sync(): line=%d\n", describe_context(), line ? 1 : 0);
/* invoke callback */ // invoke callback
if (!m_res_out_hsync_func.isnull()) if (!m_res_out_hsync_func.isnull())
m_res_out_hsync_func(line); m_res_out_hsync_func(line);
/* call virtual function */ // call virtual function
horizontal_sync_changed(m_horizontal_sync); horizontal_sync_changed(m_horizontal_sync);
} }
/* and update the field sync timer */
update_field_sync_timer();
g_profiler.stop(); g_profiler.stop();
} }