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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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35
src/emu/video/mc6847.c
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@ -221,18 +221,22 @@ void mc6847_friend_device::device_post_load(void)
// 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)
|| (m_logical_scanline_zone == SCANLINE_ZONE_VBLANK);
/* determine the duration */
attotime duration = (expected_field_sync != m_field_sync) ? attotime::from_ticks(160, m_clock) : attotime::never;
// do we need to adjust the timer?
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);
}
}
@ -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)
{
g_profiler.start(PROFILER_USER1);
// are we on a rising edge?
if (line && !m_horizontal_sync)
{
if (LOG_SCANLINE)
logerror("%s: change_horizontal_sync(): Recording scanline\n", describe_context());
/* first store the scanline */
// first store the scanline
g_profiler.start(PROFILER_USER2);
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_VBLANK:
case SCANLINE_ZONE_FRAME_END:
/* do nothing */
// do nothing
break;
}
g_profiler.stop();
/* advance to next scanline */
// advance to 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)
{
m_horizontal_sync = line;
/* log if apprpriate */
// log if apprpriate
if (LOG_HSYNC)
logerror("%s: change_horizontal_sync(): line=%d\n", describe_context(), line ? 1 : 0);
/* invoke callback */
// invoke callback
if (!m_res_out_hsync_func.isnull())
m_res_out_hsync_func(line);
/* call virtual function */
// call virtual function
horizontal_sync_changed(m_horizontal_sync);
}
/* and update the field sync timer */
update_field_sync_timer();
g_profiler.stop();
}