diff options
Diffstat (limited to 'src/emu/screen.cpp')
-rw-r--r-- | src/emu/screen.cpp | 35 |
1 files changed, 27 insertions, 8 deletions
diff --git a/src/emu/screen.cpp b/src/emu/screen.cpp index cf311fb21eb..0d8e35d6e4c 100644 --- a/src/emu/screen.cpp +++ b/src/emu/screen.cpp @@ -555,6 +555,7 @@ screen_device::screen_device(const machine_config &mconfig, const char *tag, dev , m_curbitmap(0) , m_curtexture(0) , m_changed(true) + , m_last_partial_reset(attotime::zero) , m_last_partial_scan(0) , m_partial_scan_hpos(0) , m_color(rgb_t(0xff, 0xff, 0xff, 0xff)) @@ -877,6 +878,7 @@ void screen_device::device_start() save_item(NAME(m_visarea.min_y)); save_item(NAME(m_visarea.max_x)); save_item(NAME(m_visarea.max_y)); + save_item(NAME(m_last_partial_reset)); save_item(NAME(m_last_partial_scan)); save_item(NAME(m_frame_period)); save_item(NAME(m_brightness)); @@ -1039,19 +1041,19 @@ void screen_device::reset_origin(int beamy, int beamx) m_vblank_end_time = curtime - attotime(0, beamy * m_scantime + beamx * m_pixeltime); m_vblank_start_time = m_vblank_end_time - attotime(0, m_vblank_period); - // if we are resetting relative to (0,0) == VBLANK end, call the - // scanline 0 timer by hand now; otherwise, adjust it for the future - if (beamy == 0 && beamx == 0) - reset_partial_updates(); - else - m_scanline0_timer->adjust(time_until_pos(0)); - // if we are resetting relative to (visarea.bottom() + 1, 0) == VBLANK start, // call the VBLANK start timer now; otherwise, adjust it for the future if (beamy == ((m_visarea.bottom() + 1) % m_height) && beamx == 0) vblank_begin(0); else m_vblank_begin_timer->adjust(time_until_vblank_start()); + + // if we are resetting relative to (0,0) == VBLANK end, call the + // scanline 0 timer by hand now; otherwise, adjust it for the future + if (beamy == 0 && beamx == 0) + reset_partial_updates(); + else + m_scanline0_timer->adjust(time_until_pos(0)); } @@ -1168,6 +1170,14 @@ bool screen_device::update_partial(int scanline) return false; } + // skip if we already rendered this frame + // this can happen if a cpu timeslice that called update_partial is in the previous frame while scanline 0 already started + if (m_last_partial_scan == 0 && m_last_partial_reset > machine().time()) + { + LOG_PARTIAL_UPDATES(("skipped because frame was already rendered\n")); + return false; + } + // set the range of scanlines to render rectangle clip(m_visarea); clip.sety((std::max)(clip.top(), m_last_partial_scan), (std::min)(clip.bottom(), scanline)); @@ -1278,6 +1288,14 @@ void screen_device::update_now() return; } + // skip if we already rendered this frame + // this can happen if a cpu timeslice that called update_now is in the previous frame while scanline 0 already started + if (m_last_partial_scan == 0 && m_partial_scan_hpos == 0 && m_last_partial_reset > machine().time()) + { + LOG_PARTIAL_UPDATES(("skipped because frame was already rendered\n")); + return; + } + LOG_PARTIAL_UPDATES(("update_now(): Y=%d, X=%d, last partial %d, partial hpos %d (vis %d %d)\n", current_vpos, current_hpos, m_last_partial_scan, m_partial_scan_hpos, m_visarea.right(), m_visarea.bottom())); // start off by doing a partial update up to the line before us, in case that was necessary @@ -1393,6 +1411,7 @@ void screen_device::update_now() void screen_device::reset_partial_updates() { + m_last_partial_reset = machine().time(); m_last_partial_scan = 0; m_partial_scan_hpos = 0; m_partial_updates_this_frame = 0; @@ -1914,7 +1933,7 @@ void screen_device::finalize_burnin() //------------------------------------------------- -// finalize_burnin - finalize the burnin bitmap +// load_effect_overlay - //------------------------------------------------- void screen_device::load_effect_overlay(const char *filename) |