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https://github.com/ekeeke/Genesis-Plus-GX.git
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fixed audio/video resynchronization when video settings are changed during frame execution
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ekeeke31
parent
bad0696190
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3cef34ffa4
104
HISTORY.txt
104
HISTORY.txt
@ -2,63 +2,67 @@
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Genesis Plus GX 1.4.0 (??/??/????) (Eke-Eke)
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---------------------------------------------------------------------------------------------------------
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[Core]
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------
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* modified SN76489 cut-off frequency
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* added an option to boost SN76489 Noise Channel
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* removed outdated Gens YM2612 core
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* improved YM2612 core general accuracy (SSG-EG, CSM mode,...) (based upon Nemesis recent tests on real hardware)
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* improved YM2612 LFO emulation accuracy (fixes "Spider-Man & Venom : Separation Anxiety" intro music)
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* fixed YM2612 context saving/loading.
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* added 3-Band EQ for fully configurable sound filtering (thanks to Neil C)
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* implemented faster FIR resampler, dropped libsamplerate support (thanks to Blargg & AamirM)
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* improved VDP sprite masking accuracy (thanks to Nemesis for his sprite test program)
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* improved HBLANK flag timing accuracy: fixes Mega Turrican (Sky level)
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* added support for CRAM writes during horizontal blanking.
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* fixed 2-Cell vertical scrolling when column 0 is shifted.
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* added support for 2-Cell vertical scrolling in Interlaced 2 mode.
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* fixed lightgun auto detection: fixes cursor position in Lethal Enforcers II
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* improved DIVU/DVIS (thanks to Jorge Cwik) & MULU/MULS 68k instructions timing accuracy
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* updated Z80 core to last version (fixes interrupt Mode 0 timing and some BIT instructions)
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* fixed some Z80 instructions timing
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* fixed Backup Memory support in some games using serial EEPROM
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* fixed Realtec mapper support: fix sound in Balloon Boy / Funny World
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* added Game Genie hardware emulation (Game Genie ROM is now fully supported, see README for more details)
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* added Action Replay hardware emulation (Action replay ROM is now fully supported, see README for more details)
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* added S&K "Lock-On" hardware emulation ("lock" any games to Sonic & Knuckles)
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* added Cartridge "hot swap" feature (swap games without reseting the virtual console)
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* lots of code cleanup & optimization
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* improved 68k accuracy (initial reset timing + auto-vectored interrupts handling).
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* modified Z80 & 68k cores to directly use external cycle count instead of intermediate counters.
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* improved Z80 & 68k cpu execution/synchronization accuracy, now use Master Clock as common clock reference.
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[Core/Sound]
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---------------
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* completely rewrote sound processing/mixing: sound chips are now clocked with exact output framerate
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to ensure 100% smooth video & audio playback, with no lag or skipping, while rendering an accurate number
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of samples per frame and keeping PSG & FM chips in sync.
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* improved PSG & FM chips synchronization with CPU execution (fixed point precision).
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* improved YM2612 core general accuracy (SSG-EG, CSM mode,...) (based upon Nemesis recent tests on real hardware)
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* improved YM2612 LFO emulation accuracy: fixes "Spider-Man & Venom : Separation Anxiety" (intro)
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* fixed YM2612 context saving/loading.
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* fixed YM2612 state upon reset.
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* removed outdated Gens YM2612 core
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* added faster FIR resampler (thanks to Blargg & AamirM), dropped libsamplerate support.
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* added configurable Low-Pass filtering
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* added 3-Band Equalizer to support fully configurable sound filtering (thanks to Neil C).
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* added an option to boost SN76489 Noise Channel.
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* modified SN76489 cut-off frequency.
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* completely rewrote sound output processing & mixing: sound chips are now clocked with exact output framerate
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to ensure 100% smooth video & audio playback, with no lag or skipping, while still rendering an accurate number
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of samples per frame. This would also make fast-forward implementation (video AND sound) more trivial.
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* improved color accuracy in VDP highlight mode to match results observed on real hardware.
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[Core/VDP]
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---------------
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* added support for CRAM writes during horizontal blanking.
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* added support for 2-Cell vertical scrolling in Interlaced 2 mode (unused by games ?)
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* fixed 2-Cell vertical scrolling when column 0 is shifted.
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* improved sprite masking accuracy (thanks to Nemesis for his sprite test program)
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* improved HBLANK flag timing accuracy: fixes Mega Turrican (Sky level)
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* improved sprites processing timing accuracy: fixes (un)masked sprites in Mickey Mania (3D level), Sonic 2 (VS mode).
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* improved horizontal blanking & HINT/VINT occurence timing accuracy, as measured on real hardware.
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* improved H-Counter accuraccy in 40-cell mode, as measured on real hardware.
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* improved H-Counter accuracy in 40-cell mode, as measured on real hardware.
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* improved color accuracy in VDP highlight mode to match results observed on real hardware.
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[Core/CPU]
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---------------
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* updated Z80 core to last version (fixes interrupt Mode 0 timing and some BIT instructions).
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* fixed some Z80 instructions timing.
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* improved 68k accuracy (initial Reset timing + auto-vectored interrupts handling).
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* improved 68k timing accuracy for DIVU/DVIS (thanks to Jorge Cwik) & MULU/MULS instructions.
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* improved Z80 & 68k cpu execution/synchronization accuracy by using Master Clock as common reference (now run exactly 3420 M-Cycles per line).
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* modified Z80 & 68k cores to directly use external cycle count instead of intermediate counters.
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[Core/Extra]
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---------------
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* added Game Genie hardware emulation (Game Genie ROM is now fully supported).
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* added Action Replay hardware emulation (Action replay ROM is now fully supported).
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* added S&K "Lock-On" hardware emulation (you can "lock" any games to Sonic & Knuckles).
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* added Cartridge "hot swap" feature.
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* fixed Backup Memory support in some games that were actually using serial EEPROM.
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* fixed Realtec mapper emulation: fixes missing sound in Balloon Boy / Funny World.
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* fixed lightgun auto detection: fixes cursor position in Lethal Enforcers II.
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* lots of code cleanup, bugfixes & optimization.
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[Gamecube/Wii]
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---------------
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* new! FONT engine (using internal IPL font & GX hardware rendering).
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* new! GUI engine (with PCM/OGG sound support, using GX hardware rendering & multithreading).
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* new! interface design (incl. IR pointing, game snapshots, visual & sound effects, BGM...).
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* improved audio/video back-end synchronization to ensure 100% smooth video & audio playback.
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* improved reset button behavior, now works more like the real Genesis reset button.
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* improved lightgun cursors layout.
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* fixed stability issues and memory leaks.
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* compiled with Devkitpro/PPC r18 and last libogc/libfat (support for SDHC, new DVDX, etc)
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* improved audio/video synchronization (see above)
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* improved reset button behavior, now works much more like the real Genesis reset button
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* fixed stability issues and some memory leaks
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* added internal screenshot feature
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* improved lightgun cursors
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* new FONT & GUI engines: use internal IPL FONT, GX hardware rendering, sound support & multithreading.
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* new emulator interface design: incl. IR pointing, game snapshots, menu effects, sound effects, BGM...
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(check the README for more details)
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@ -37,7 +37,7 @@ u8 soundbuffer[2][3840] ATTRIBUTE_ALIGN(32);
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u32 mixbuffer;
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/* audio DMA status */
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static u32 audioStarted = 0;
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u32 audioStarted;
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/* Background music */
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static u8 *Bg_music_ogg = NULL;
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@ -100,18 +100,22 @@ void gx_audio_Update(void)
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/* set next DMA soundbuffer */
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s16 *sb = (s16 *)(soundbuffer[mixbuffer]);
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mixbuffer ^= 1;
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DCFlushRange((void *)sb, size);
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AUDIO_InitDMA((u32) sb, size);
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mixbuffer ^= 1;
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/* Start Audio DMA */
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/* this is only called once to kick-off DMA from external memory to audio interface */
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/* this is called once to kick-off DMA from external memory to audio interface */
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/* DMA operation is automatically restarted when all samples have been sent. */
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/* If DMA settings are not updated at that time, previous sound buffer will be used. */
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/* Therefore we need to make sure frame emulation is completed before current DMA is */
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/* completed, either by synchronizing frame emulation with DMA start or by syncing it */
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/* with Vertical Interrupt and outputing a suitable number of samples per frame. */
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/* In 60hz mode, VSYNC period is actually 16715 ms which is 802.32 samples at 48kHz. */
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/* */
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/* In both cases, audio DMA need to be synchronized with VSYNC and therefore need to */
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/* be resynchronized (restarted) every time video settings are changed (hopefully, */
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/* this generally happens while no music is played. */
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if (!audioStarted)
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{
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audioStarted = 1;
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@ -120,6 +124,8 @@ void gx_audio_Update(void)
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if (gc_pal | vdp_pal)
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AUDIO_RegisterDMACallback(ai_callback);
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/* restart audio DMA */
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AUDIO_StopDMA();
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AUDIO_StartDMA();
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if (frameticker > 1)
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frameticker = 1;
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@ -27,6 +27,7 @@
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extern u8 soundbuffer[2][3840];
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extern u32 mixbuffer;
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extern u32 audioStarted;
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extern void gx_audio_Init(void);
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extern void gx_audio_Shutdown(void);
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@ -1288,7 +1288,7 @@ void gx_video_Start(void)
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VIDEO_SetPostRetraceCallback(NULL);
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VIDEO_Flush();
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/* interlaced/progressive Video mode */
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/* switch interlaced/progressive video settings */
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if (config.render == 2)
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{
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tvmodes[2]->viTVMode = VI_TVMODE_NTSC_PROG;
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@ -1440,7 +1440,7 @@ void gx_video_Update(void)
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if (update)
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{
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/* field synchronizations */
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/* field synchronization */
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VIDEO_WaitVSync();
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if (rmode->viTVMode & VI_NON_INTERLACE)
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VIDEO_WaitVSync();
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@ -1448,6 +1448,10 @@ void gx_video_Update(void)
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VIDEO_WaitVSync();
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if (frameticker > 1)
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frameticker = 1;
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/* force audio DMA resynchronization */
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audioStarted = 0;
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bitmap.viewport.changed = 0;
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}
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}
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