bsnes/higan/md/apu/apu.cpp

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Update to v100r02 release. byuu says: Sigh ... I'm really not a good person. I'm inherently selfish. My responsibility and obligation right now is to work on loki, and then on the Tengai Makyou Zero translation, and then on improving the Famicom emulation. And yet ... it's not what I really want to do. That shouldn't matter; I should work on my responsibilities first. Instead, I'm going to be a greedy, self-centered asshole, and work on what I really want to instead. I'm really sorry, guys. I'm sure this will make a few people happy, and probably upset even more people. I'm also making zero guarantees that this ever gets finished. As always, I wish I could keep these things secret, so if I fail / give up, I could just drop it with no shame. But I would have to cut everyone out of the WIP process completely to make it happen. So, here goes ... This WIP adds the initial skeleton for Sega Mega Drive / Genesis emulation. God help us. (minor note: apparently the new extension for Mega Drive games is .md, neat. That's what I chose for the folders too. I thought it was .smd, so that'll be fixed in icarus for the next WIP.) (aside: this is why I wanted to get v100 out. I didn't want this code in a skeleton state in v100's source. Nor did I want really broken emulation, which the first release is sure to be, tarring said release.) ... So, basically, I've been ruminating on the legacy I want to leave behind with higan. 3D systems are just plain out. I'm never going to support them. They're too complex for my abilities, and they would run too slowly with my design style. I'm not willing to compromise my design ideals. And I would never want to play a 3D game system at native 240p/480i resolution ... but 1080p+ upscaling is not accurate, so that's a conflict I want to avoid entirely. It's also never going to emulate computer systems (X68K, PC-98, FM-Towns, etc) because holy shit that would completely destroy me. It's also never going emulate arcade machines. So I think of higan as a collection of 2D emulators for consoles and handhelds. I've gone over every major 2D gaming system there is, looking for ones with games I actually care about and enjoy. And I basically have five of those systems supported already. Looking at the remaining list, I see only three systems left that I have any interest in whatsoever: PC-Engine, Master System, Mega Drive. Again, I'm not in any way committing to emulating any of these, but ... if I had all of those in higan, I think I'd be content to really, truly, finally stop writing more emulators for the rest of my life. And so I decided to tackle the most difficult system first. If I'm successful, the Z80 core should cover a lot of the work on the SMS. And the HuC6280 should land somewhere between the NES and SNES in terms of difficulty ... closer to the NES. The systems that just don't appeal to me at all, which I will never touch, include, but are not limited to: * Atari 2600/5200/7800 * Lynx * Jaguar * Vectrex * Colecovision * Commodore 64 * Neo-Geo * Neo-Geo Pocket / Color * Virtual Boy * Super A'can * 32X * CD-i * etc, etc, etc. And really, even if something were mildly interesting in there ... we have to stop. I can't scale infinitely. I'm already way past my limit, but I'm doing this anyway. Too many cores bloats everything and kills quality on everything. I don't want higan to become MESS v2. I don't know what I'll do about the Famicom Disk System, PC-Engine CD, and Mega CD. I don't think I'll be able to achieve 60fps emulating the Mega CD, even if I tried to. I don't know what's going to happen here with even the Mega Drive. Maybe I'll get driven crazy with the documentation and quit. Maybe it'll end up being too complicated and I'll quit. Maybe the emulation will end up way too slow and I'll give up. Maybe it'll take me seven years to get any games playable at all. Maybe Steve Snake, AamirM and Mike Pavone will pool money to hire a hitman to come after me. Who knows. But this is what I want to do, so ... here goes nothing.
2016-07-09 04:21:37 +00:00
#include <md/md.hpp>
namespace MegaDrive {
APU apu;
#include "bus.cpp"
Update to v102r16 release. byuu says: Changelog: - Emulator::Stream now allows adding low-pass and high-pass filters dynamically - also accepts a pass# count; each pass is a second-order biquad butterworth IIR filter - Emulator::Stream no longer automatically filters out >20KHz frequencies for all streams - FC: added 20Hz high-pass filter; 20KHz low-pass filter - GB: removed simple 'magic constant' high-pass filter of unknown cutoff frequency (missed this one in the last WIP) - GB,SGB,GBC: added 20Hz high-pass filter; 20KHz low-pass filter - MS,GG,MD/PSG: added 20Hz high-pass filter; 20KHz low-pass filter - MD: added save state support (but it's completely broken for now; sorry) - MD/YM2612: fixed Voice#3 per-operator pitch support (fixes sound effects in Streets of Rage, etc) - PCE: added 20Hz high-pass filter; 20KHz low-pass filter - WS,WSC: added 20Hz high-pass filter; 20KHz low-pass filter So, the point of the low-pass filters is to remove frequencies above human hearing. If we don't do this, then resampling will introduce aliasing that results in sounds that are audible to the human ear. Which basically an annoying buzzing sound. You'll definitely hear the improvement from these in games like Mega Man 2 on the NES. Of course, these already existed before, so this WIP won't sound better than previous WIPs. The high-pass filters are a little more complicated. Their main role is to remove DC bias and help to center the audio stream. I don't understand how they do this at all, but ... that's what everyone who knows what they're talking about says, thus ... so be it. I have set all of the high-pass filters to 20Hz, which is below the limit of human hearing. Now this is where it gets really interesting ... technically, some of these systems actually cut off a lot of range. For instance, the GBA should technically use an 800Hz high-pass filter when output is done through the system's speakers. But of course, if you plug in headphones, you can hear the lower frequencies. Now 800Hz ... you definitely can hear. At that level, nearly all of the bass is stripped out and the audio is very tinny. Just like the real system. But for now, I don't want to emulate the audio being crushed that badly. I'm sticking with 20Hz everywhere since it won't negatively affect audio quality. In fact, you should not be able to hear any difference between this WIP and the previous WIP. But theoretically, DC bias should mostly be removed as a result of these new filters. It may be that we need to raise the values on some cores in the future, but I don't want to do that until we know for certain that we have to. What I can say is that compared to even older WIPs than r15 ... the removal of the simple one-pole low-pass and high-pass filters with the newer three-pass, second-order filters should result in much better attenuation (less distortion of audible frequencies.) Probably not enough to be noticeable in a blind test, though.
2017-03-08 20:20:40 +00:00
#include "serialization.cpp"
Update to v100r02 release. byuu says: Sigh ... I'm really not a good person. I'm inherently selfish. My responsibility and obligation right now is to work on loki, and then on the Tengai Makyou Zero translation, and then on improving the Famicom emulation. And yet ... it's not what I really want to do. That shouldn't matter; I should work on my responsibilities first. Instead, I'm going to be a greedy, self-centered asshole, and work on what I really want to instead. I'm really sorry, guys. I'm sure this will make a few people happy, and probably upset even more people. I'm also making zero guarantees that this ever gets finished. As always, I wish I could keep these things secret, so if I fail / give up, I could just drop it with no shame. But I would have to cut everyone out of the WIP process completely to make it happen. So, here goes ... This WIP adds the initial skeleton for Sega Mega Drive / Genesis emulation. God help us. (minor note: apparently the new extension for Mega Drive games is .md, neat. That's what I chose for the folders too. I thought it was .smd, so that'll be fixed in icarus for the next WIP.) (aside: this is why I wanted to get v100 out. I didn't want this code in a skeleton state in v100's source. Nor did I want really broken emulation, which the first release is sure to be, tarring said release.) ... So, basically, I've been ruminating on the legacy I want to leave behind with higan. 3D systems are just plain out. I'm never going to support them. They're too complex for my abilities, and they would run too slowly with my design style. I'm not willing to compromise my design ideals. And I would never want to play a 3D game system at native 240p/480i resolution ... but 1080p+ upscaling is not accurate, so that's a conflict I want to avoid entirely. It's also never going to emulate computer systems (X68K, PC-98, FM-Towns, etc) because holy shit that would completely destroy me. It's also never going emulate arcade machines. So I think of higan as a collection of 2D emulators for consoles and handhelds. I've gone over every major 2D gaming system there is, looking for ones with games I actually care about and enjoy. And I basically have five of those systems supported already. Looking at the remaining list, I see only three systems left that I have any interest in whatsoever: PC-Engine, Master System, Mega Drive. Again, I'm not in any way committing to emulating any of these, but ... if I had all of those in higan, I think I'd be content to really, truly, finally stop writing more emulators for the rest of my life. And so I decided to tackle the most difficult system first. If I'm successful, the Z80 core should cover a lot of the work on the SMS. And the HuC6280 should land somewhere between the NES and SNES in terms of difficulty ... closer to the NES. The systems that just don't appeal to me at all, which I will never touch, include, but are not limited to: * Atari 2600/5200/7800 * Lynx * Jaguar * Vectrex * Colecovision * Commodore 64 * Neo-Geo * Neo-Geo Pocket / Color * Virtual Boy * Super A'can * 32X * CD-i * etc, etc, etc. And really, even if something were mildly interesting in there ... we have to stop. I can't scale infinitely. I'm already way past my limit, but I'm doing this anyway. Too many cores bloats everything and kills quality on everything. I don't want higan to become MESS v2. I don't know what I'll do about the Famicom Disk System, PC-Engine CD, and Mega CD. I don't think I'll be able to achieve 60fps emulating the Mega CD, even if I tried to. I don't know what's going to happen here with even the Mega Drive. Maybe I'll get driven crazy with the documentation and quit. Maybe it'll end up being too complicated and I'll quit. Maybe the emulation will end up way too slow and I'll give up. Maybe it'll take me seven years to get any games playable at all. Maybe Steve Snake, AamirM and Mike Pavone will pool money to hire a hitman to come after me. Who knows. But this is what I want to do, so ... here goes nothing.
2016-07-09 04:21:37 +00:00
auto APU::Enter() -> void {
while(true) scheduler.synchronize(), apu.main();
}
auto APU::main() -> void {
Update to v102r17 release. byuu says: Changelog: - GBA: process audio at 2MHz instead of 32KHz¹ - MD: do not allow the 68K to stop the Z80, unless it has been granted bus access first - MD: do not reset bus requested/granted signals when the 68K resets the Z80 - the above two fix The Lost Vikings - MD: clean up the bus address decoding to be more readable - MD: add support for a13000-a130ff (#TIME) region; pass to cartridge I/O² - MD: emulate SRAM mapping used by >16mbit games; bank mapping used by >32mbit games³ - MD: add 'reset pending' flag so that loading save states won't reload 68K PC, SP registers - this fixes save state support ... mostly⁴ - MD: if DMA is not enabled, do not allow CD5 to be set [Cydrak] - this fixes in-game graphics for Ristar. Title screen still corrupted on first run - MD: detect and break sprite lists that form an infinite loop [Cydrak] - this fixes the emulator from dead-locking on certain games - MD: add DC offset to sign DAC PCM samples [Cydrak] - this improves audio in Sonic 3 - MD: 68K TAS has a hardware bug that prevents writing the result back to RAM - this fixes Gargoyles - MD: 68K TRAP should not change CPU interrupt level - this fixes Shining Force II, Shining in the Darkness, etc - icarus: better SRAM heuristics for Mega Drive games Todo: - need to serialize the new cartridge ramEnable, ramWritable, bank variables ¹: so technically, the GBA has its FIFO queue (raw PCM), plus a GB chipset. The GB audio runs at 2MHz. However, I was being lazy and running the sequencer 64 times in a row, thus decimating the audio to 32KHz. But simply discarding 63 out of every 64 samples resorts in muddier sound with more static in it. However ... increasing the audio thread processing intensity 64-fold, and requiring heavy-duty three-chain lowpass and highpass filters is not cheap. For this bump in sound quality, we're eating a loss of about 30% of previous performance. Also note that the GB audio emulation in the GBA core still lacks many of the improvements made to the GB core. I was hoping to complete the GB enhancements, but it seems like I'm never going to pass blargg's psychotic edge case tests. So, first I want to clean up the GB audio to my current coding standards, and then I'll port that over to the GBA, which should further increase sound quality. At that point, it sound exceed mGBA's audio quality (due to the ridiculously high sampling rate and strong-attenuation audio filtering.) ²: word writes are probably not handled correctly ... but games are only supposed to do byte writes here. ³: the SRAM mapping is used by games like "Story of Thor" and "Phantasy Star IV." Unfortunately, the former wasn't released in the US and is region protected. So you'll need to change the NTSU to NTSCJ in md/system/system.cpp in order to boot it. But it does work nicely now. The write protection bit is cleared in the game, and then it fails to write to SRAM (soooooooo many games with SRAM write protection do this), so for now I've had to disable checking that bit. Phantasy Star IV has a US release, but sadly the game doesn't boot yet. Hitting some other bug. The bank mapping is pretty much just for the 40mbit Super Street Fighter game. It shows the Sega and Capcom logos now, but is hitting yet another bug and deadlocking. For now, I emulate the SRAM/bank mapping registers on all cartridges, and set sane defaults. So long as games don't write to $a130XX, they should all continue to work. But obviously, we need to get to a point where higan/icarus can selectively enable these registers on a per-game basis. ⁴: so, the Mega Drive has various ways to lock a chip until another chip releases it. The VDP can lock the 68K, the 68K can lock the Z80, etc. If this happens when you save a state, it'll dead-lock the emulator. So that's obviously a problem that needs to be fixed. The fix will be nasty ... basically, bypassing the dead-lock, creating a miniature, one-instruction-long race condition. Extremely unlikely to cause any issues in practice (it's only a little worse than the SNES CPU/SMP desync), but ... there's nothing I can do about it. So you'll have to take it or leave it. But yeah, for now, save states may lock up the emulator. I need to add code to break the loops when in the process of creating a save state still.
2017-03-10 10:23:29 +00:00
if(!state.enabled) {
return step(1);
}
Update to v102r08 release. byuu says: Changelog: - PCE: restructured VCE, VDCs to run one scanline at a time - PCE: bound VDCs to 1365x262 timing (in order to decouple the VDCs from the VCE) - PCE: the two changes above allow save states to function; also grants a minor speed boost - PCE: added cheat code support (uses 21-bit bus addressing; compare byte will be useful here) - 68K: fixed `mov *,ccr` to read two bytes instead of one [Cydrak] - Z80: emulated /BUSREQ, /BUSACK; allows 68K to suspend the Z80 [Cydrak] - MD: emulated the Z80 executing instructions [Cydrak] - MD: emulated Z80 interrupts (triggered during each Vblank period) [Cydrak] - MD: emulated Z80 memory map [Cydrak] - MD: added stubs for PSG, YM2612 accesses [Cydrak] - MD: improved bus emulation [Cydrak] The PCE core is pretty much ready to go. The only major feature missing is FM modulation. The Mega Drive improvements let us start to see the splash screens for Langrisser II, Shining Force, Shining in the Darkness. I was hoping I could get them in-game, but no such luck. My Z80 implementation is probably flawed in some way ... now that I think about it, I believe I missed the BusAPU::reset() check for having been granted access to the Z80 first. But I doubt that's the problem. Next step is to implement Cydrak's PSG core into the Master System emulator. Once that's in, I'm going to add save states and cheat code support to the Master System core. Next, I'll add the PSG core into the Mega Drive. Then I'll add the 'easy' PCM part of the YM2612. Then the rest of the beastly YM2612 core. Then finally, cap things off with save state and cheat code support. Should be nearing a new release at that point.
2017-02-20 08:13:10 +00:00
if(state.nmiLine) {
state.nmiLine = 0; //edge-sensitive
irq(0, 0x0066, 0xff);
}
if(state.intLine) {
//level-sensitive
irq(1, 0x0038, 0xff);
}
instruction();
}
auto APU::step(uint clocks) -> void {
Update to v101r04 release. byuu says: Changelog: - pulled the (u)intN type aliases into higan instead of leaving them in nall - added 68K LINEA, LINEF hooks for illegal instructions - filled the rest of the 68K lambda table with generic instance of ILLEGAL - completed the 68K disassembler effective addressing modes - still unsure whether I should use An to decode absolute addresses or not - pro: way easier to read where accesses are taking place - con: requires An to be valid; so as a disassembler it does a poor job - making it optional: too much work; ick - added I/O decoding for the VDP command-port registers - added skeleton timing to all five processor cores - output at 1280x480 (needed for mixed 256/320 widths; and to handle interlace modes) The VDP, PSG, Z80, YM2612 are all stepping one clock at a time and syncing; which is the pathological worst case for libco. But they also have no logic inside of them. With all the above, I'm averaging around 250fps with just the 68K core actually functional, and the VDP doing a dumb "draw white pixels" loop. Still way too early to tell how this emulator is going to perform. Also, the 320x240 mode of the Genesis means that we don't need an aspect correction ratio. But we do need to ensure the output window is a multiple 320x240 so that the scale values work correctly. I was hard-coding aspect correction to stretch the window an additional \*8/7. But that won't work anymore so ... the main higan window is now 640x480, 960x720, or 1280x960. Toggling aspect correction only changes the video width inside the window. It's a bit jarring ... the window is a lot wider, more black space now for most modes. But for now, it is what it is.
2016-08-12 01:07:04 +00:00
Thread::step(clocks);
synchronize(cpu);
}
Update to v103 WIP release. byuu says (in the WIP forum): Changelog: - higan: cheat codes accept = and ? separators now - the new preferred code format is: address=value or address=if-match?value - the old code format of address/value and address/if-match/value will continue to work - higan: cheats.bml is no longer included with the base distribution - mightymo stopped updating it in 2015, and it's not source code; it can still be pulled in from older releases - fc: improved PAL mode timing; use PAL APU timing tables; fix PAL noise period table [hex\_usr] - md: support aborting a Z80 bus wait in order to capture save states without freezing - note that this will violate accuracy; but in practice a slight desync is better than an emulator deadlock - sfc: revert DSP ENDX randomization for now (want to research it more before deploying in an official release) - sfc: fix Super Famicom.sys/manifest.bml APU RAM size [hex\_usr] - tomoko: cleaned up make install rules - hiro/cocoa: use ABGR for pixel data [Sintendo] Note: I forgot to change the command-line and drag-and-drop separator from : to | in this WIP. However, it is corrected in the v103 official binary and source published on download.byuu.org. Sorry about that, I know it makes the Git repository history more difficult. I'm not concerned whether the : → | change is part of v103 or v103r01 in the repository, and will leave this to your discretion, Screwtape. I also still need to set the VDP bit to indicate PAL mode in the Mega Drive core. This is what happens when I have 47 things I have to do, given how lousy my memory is. I miss things.
2017-06-22 06:04:07 +00:00
auto APU::synchronizing() const -> bool {
return scheduler.synchronizing();
}
Update to v102r08 release. byuu says: Changelog: - PCE: restructured VCE, VDCs to run one scanline at a time - PCE: bound VDCs to 1365x262 timing (in order to decouple the VDCs from the VCE) - PCE: the two changes above allow save states to function; also grants a minor speed boost - PCE: added cheat code support (uses 21-bit bus addressing; compare byte will be useful here) - 68K: fixed `mov *,ccr` to read two bytes instead of one [Cydrak] - Z80: emulated /BUSREQ, /BUSACK; allows 68K to suspend the Z80 [Cydrak] - MD: emulated the Z80 executing instructions [Cydrak] - MD: emulated Z80 interrupts (triggered during each Vblank period) [Cydrak] - MD: emulated Z80 memory map [Cydrak] - MD: added stubs for PSG, YM2612 accesses [Cydrak] - MD: improved bus emulation [Cydrak] The PCE core is pretty much ready to go. The only major feature missing is FM modulation. The Mega Drive improvements let us start to see the splash screens for Langrisser II, Shining Force, Shining in the Darkness. I was hoping I could get them in-game, but no such luck. My Z80 implementation is probably flawed in some way ... now that I think about it, I believe I missed the BusAPU::reset() check for having been granted access to the Z80 first. But I doubt that's the problem. Next step is to implement Cydrak's PSG core into the Master System emulator. Once that's in, I'm going to add save states and cheat code support to the Master System core. Next, I'll add the PSG core into the Mega Drive. Then I'll add the 'easy' PCM part of the YM2612. Then the rest of the beastly YM2612 core. Then finally, cap things off with save state and cheat code support. Should be nearing a new release at that point.
2017-02-20 08:13:10 +00:00
auto APU::setNMI(bool value) -> void {
state.nmiLine = value;
}
auto APU::setINT(bool value) -> void {
state.intLine = value;
}
auto APU::enable(bool value) -> void {
Update to v102r17 release. byuu says: Changelog: - GBA: process audio at 2MHz instead of 32KHz¹ - MD: do not allow the 68K to stop the Z80, unless it has been granted bus access first - MD: do not reset bus requested/granted signals when the 68K resets the Z80 - the above two fix The Lost Vikings - MD: clean up the bus address decoding to be more readable - MD: add support for a13000-a130ff (#TIME) region; pass to cartridge I/O² - MD: emulate SRAM mapping used by >16mbit games; bank mapping used by >32mbit games³ - MD: add 'reset pending' flag so that loading save states won't reload 68K PC, SP registers - this fixes save state support ... mostly⁴ - MD: if DMA is not enabled, do not allow CD5 to be set [Cydrak] - this fixes in-game graphics for Ristar. Title screen still corrupted on first run - MD: detect and break sprite lists that form an infinite loop [Cydrak] - this fixes the emulator from dead-locking on certain games - MD: add DC offset to sign DAC PCM samples [Cydrak] - this improves audio in Sonic 3 - MD: 68K TAS has a hardware bug that prevents writing the result back to RAM - this fixes Gargoyles - MD: 68K TRAP should not change CPU interrupt level - this fixes Shining Force II, Shining in the Darkness, etc - icarus: better SRAM heuristics for Mega Drive games Todo: - need to serialize the new cartridge ramEnable, ramWritable, bank variables ¹: so technically, the GBA has its FIFO queue (raw PCM), plus a GB chipset. The GB audio runs at 2MHz. However, I was being lazy and running the sequencer 64 times in a row, thus decimating the audio to 32KHz. But simply discarding 63 out of every 64 samples resorts in muddier sound with more static in it. However ... increasing the audio thread processing intensity 64-fold, and requiring heavy-duty three-chain lowpass and highpass filters is not cheap. For this bump in sound quality, we're eating a loss of about 30% of previous performance. Also note that the GB audio emulation in the GBA core still lacks many of the improvements made to the GB core. I was hoping to complete the GB enhancements, but it seems like I'm never going to pass blargg's psychotic edge case tests. So, first I want to clean up the GB audio to my current coding standards, and then I'll port that over to the GBA, which should further increase sound quality. At that point, it sound exceed mGBA's audio quality (due to the ridiculously high sampling rate and strong-attenuation audio filtering.) ²: word writes are probably not handled correctly ... but games are only supposed to do byte writes here. ³: the SRAM mapping is used by games like "Story of Thor" and "Phantasy Star IV." Unfortunately, the former wasn't released in the US and is region protected. So you'll need to change the NTSU to NTSCJ in md/system/system.cpp in order to boot it. But it does work nicely now. The write protection bit is cleared in the game, and then it fails to write to SRAM (soooooooo many games with SRAM write protection do this), so for now I've had to disable checking that bit. Phantasy Star IV has a US release, but sadly the game doesn't boot yet. Hitting some other bug. The bank mapping is pretty much just for the 40mbit Super Street Fighter game. It shows the Sega and Capcom logos now, but is hitting yet another bug and deadlocking. For now, I emulate the SRAM/bank mapping registers on all cartridges, and set sane defaults. So long as games don't write to $a130XX, they should all continue to work. But obviously, we need to get to a point where higan/icarus can selectively enable these registers on a per-game basis. ⁴: so, the Mega Drive has various ways to lock a chip until another chip releases it. The VDP can lock the 68K, the 68K can lock the Z80, etc. If this happens when you save a state, it'll dead-lock the emulator. So that's obviously a problem that needs to be fixed. The fix will be nasty ... basically, bypassing the dead-lock, creating a miniature, one-instruction-long race condition. Extremely unlikely to cause any issues in practice (it's only a little worse than the SNES CPU/SMP desync), but ... there's nothing I can do about it. So you'll have to take it or leave it. But yeah, for now, save states may lock up the emulator. I need to add code to break the loops when in the process of creating a save state still.
2017-03-10 10:23:29 +00:00
//68K cannot disable the Z80 without bus access
if(!bus->granted() && !value) return;
if(state.enabled && !value) reset();
Update to v102r08 release. byuu says: Changelog: - PCE: restructured VCE, VDCs to run one scanline at a time - PCE: bound VDCs to 1365x262 timing (in order to decouple the VDCs from the VCE) - PCE: the two changes above allow save states to function; also grants a minor speed boost - PCE: added cheat code support (uses 21-bit bus addressing; compare byte will be useful here) - 68K: fixed `mov *,ccr` to read two bytes instead of one [Cydrak] - Z80: emulated /BUSREQ, /BUSACK; allows 68K to suspend the Z80 [Cydrak] - MD: emulated the Z80 executing instructions [Cydrak] - MD: emulated Z80 interrupts (triggered during each Vblank period) [Cydrak] - MD: emulated Z80 memory map [Cydrak] - MD: added stubs for PSG, YM2612 accesses [Cydrak] - MD: improved bus emulation [Cydrak] The PCE core is pretty much ready to go. The only major feature missing is FM modulation. The Mega Drive improvements let us start to see the splash screens for Langrisser II, Shining Force, Shining in the Darkness. I was hoping I could get them in-game, but no such luck. My Z80 implementation is probably flawed in some way ... now that I think about it, I believe I missed the BusAPU::reset() check for having been granted access to the Z80 first. But I doubt that's the problem. Next step is to implement Cydrak's PSG core into the Master System emulator. Once that's in, I'm going to add save states and cheat code support to the Master System core. Next, I'll add the PSG core into the Mega Drive. Then I'll add the 'easy' PCM part of the YM2612. Then the rest of the beastly YM2612 core. Then finally, cap things off with save state and cheat code support. Should be nearing a new release at that point.
2017-02-20 08:13:10 +00:00
state.enabled = value;
}
Update to v105r1 release. byuu says: Changelog: - higan: readded support for soft-reset to Famicom, Super Famicom, Mega Drive cores (work in progress) - handhelds lack soft reset obviously - the PC Engine also lacks a physical reset button - the Master System's reset button acts like a gamepad button, so can't show up in the menu - Mega Drive: power cycle wasn't initializing CPU (M68K) or APU (Z80) RAM - Super Famicom: fix SPC700 opcode 0x3b regression; fixes Majuu Ou [Jonas Quinn] - Super Famicom: fix SharpRTC save regression; fixes Dai Kaijuu Monogatari II's real-time clock [Talarubi] - Super Famicom: fix EpsonRTC save regression; fixes Tengai Makyou Zero's real-time clock [Talarubi] - Super Famicom: removed `*::init()` functions, as they were never used - Super Famicom: removed all but two `*::load()` functions, as they were not used - higan: added option to auto-save backup RAM every five seconds (enabled by default) - this is in case the emulator crashes, or there's a power outage; turn it off under advanced settings if you want - libco: updated license from public domain to ISC, for consistency with nall, ruby, hiro - nall: Linux compiler defaults to g++; override with g++-version if g++ is <= 4.8 - FreeBSD compiler default is going to remain g++49 until my dev box OS ships with g++ >= 4.9 Errata: I have weird RAM initialization constants, thanks to hex_usr and onethirdxcubed for both finding this: http://wiki.nesdev.com/w/index.php?title=CPU_power_up_state&diff=11711&oldid=11184 I'll remove this in the next WIP.
2017-11-06 22:05:54 +00:00
auto APU::power(bool reset) -> void {
Z80::bus = this;
Z80::power();
Update to v103r02 release. byuu says: Changelog: - fc/apu: improved phase duty cycle emulation (mode 3 is 25% phase inverted; counter decrements) - md/apu: power/reset do not cancel 68K bus requests - md/apu: 68K is not granted bus access on Z80 power/reset - md/controller: replaced System::Peripherals with ControllerPort concept - md/controller: CTRL port is now read-write, maintains value across controller changes (and soon, soft resets) - md/psg: PSG sampling rate unintentionally modified¹ - processor/spc700: improve cycle timing of (indirect),y instructions [Overload] - processor/spc700: idle() cycles actually read from the program counter; much like the 6502 [Overload] - some of the idle() cycles should read from other addresses; this still needs to be supported - processor/spc700: various cleanups to instruction function naming - processor/z80: prefix state (HL→IX,IY override) can now be serialized - icarus: fix install rule for certain platforms (it wasn't buggy on FreeBSD, but was on Linux?) ¹: the clock speed of the PSG is oscillator/15. But I was setting the sampling rate to oscillator/15/16, which was around 223KHz. I am not sure whether the PSG should be outputting at 3MHz or 223KHz. Amazingly ... I don't really hear a difference either way `o_O` I didn't actually mean to make this change; I just noticed it after comparing the diff between r01 and r02. If this turns out to be wrong, set stream = Emulator::audio.createStream(1, frequency() / 16.0); in md/psg.cpp to revert this change.
2017-06-27 01:18:28 +00:00
bus->grant(false);
create(APU::Enter, system.frequency() / 15.0);
Update to v105r1 release. byuu says: Changelog: - higan: readded support for soft-reset to Famicom, Super Famicom, Mega Drive cores (work in progress) - handhelds lack soft reset obviously - the PC Engine also lacks a physical reset button - the Master System's reset button acts like a gamepad button, so can't show up in the menu - Mega Drive: power cycle wasn't initializing CPU (M68K) or APU (Z80) RAM - Super Famicom: fix SPC700 opcode 0x3b regression; fixes Majuu Ou [Jonas Quinn] - Super Famicom: fix SharpRTC save regression; fixes Dai Kaijuu Monogatari II's real-time clock [Talarubi] - Super Famicom: fix EpsonRTC save regression; fixes Tengai Makyou Zero's real-time clock [Talarubi] - Super Famicom: removed `*::init()` functions, as they were never used - Super Famicom: removed all but two `*::load()` functions, as they were not used - higan: added option to auto-save backup RAM every five seconds (enabled by default) - this is in case the emulator crashes, or there's a power outage; turn it off under advanced settings if you want - libco: updated license from public domain to ISC, for consistency with nall, ruby, hiro - nall: Linux compiler defaults to g++; override with g++-version if g++ is <= 4.8 - FreeBSD compiler default is going to remain g++49 until my dev box OS ships with g++ >= 4.9 Errata: I have weird RAM initialization constants, thanks to hex_usr and onethirdxcubed for both finding this: http://wiki.nesdev.com/w/index.php?title=CPU_power_up_state&diff=11711&oldid=11184 I'll remove this in the next WIP.
2017-11-06 22:05:54 +00:00
if(!reset) memory::fill(ram, sizeof ram);
Update to v103r02 release. byuu says: Changelog: - fc/apu: improved phase duty cycle emulation (mode 3 is 25% phase inverted; counter decrements) - md/apu: power/reset do not cancel 68K bus requests - md/apu: 68K is not granted bus access on Z80 power/reset - md/controller: replaced System::Peripherals with ControllerPort concept - md/controller: CTRL port is now read-write, maintains value across controller changes (and soon, soft resets) - md/psg: PSG sampling rate unintentionally modified¹ - processor/spc700: improve cycle timing of (indirect),y instructions [Overload] - processor/spc700: idle() cycles actually read from the program counter; much like the 6502 [Overload] - some of the idle() cycles should read from other addresses; this still needs to be supported - processor/spc700: various cleanups to instruction function naming - processor/z80: prefix state (HL→IX,IY override) can now be serialized - icarus: fix install rule for certain platforms (it wasn't buggy on FreeBSD, but was on Linux?) ¹: the clock speed of the PSG is oscillator/15. But I was setting the sampling rate to oscillator/15/16, which was around 223KHz. I am not sure whether the PSG should be outputting at 3MHz or 223KHz. Amazingly ... I don't really hear a difference either way `o_O` I didn't actually mean to make this change; I just noticed it after comparing the diff between r01 and r02. If this turns out to be wrong, set stream = Emulator::audio.createStream(1, frequency() / 16.0); in md/psg.cpp to revert this change.
2017-06-27 01:18:28 +00:00
state = {};
Update to v102r17 release. byuu says: Changelog: - GBA: process audio at 2MHz instead of 32KHz¹ - MD: do not allow the 68K to stop the Z80, unless it has been granted bus access first - MD: do not reset bus requested/granted signals when the 68K resets the Z80 - the above two fix The Lost Vikings - MD: clean up the bus address decoding to be more readable - MD: add support for a13000-a130ff (#TIME) region; pass to cartridge I/O² - MD: emulate SRAM mapping used by >16mbit games; bank mapping used by >32mbit games³ - MD: add 'reset pending' flag so that loading save states won't reload 68K PC, SP registers - this fixes save state support ... mostly⁴ - MD: if DMA is not enabled, do not allow CD5 to be set [Cydrak] - this fixes in-game graphics for Ristar. Title screen still corrupted on first run - MD: detect and break sprite lists that form an infinite loop [Cydrak] - this fixes the emulator from dead-locking on certain games - MD: add DC offset to sign DAC PCM samples [Cydrak] - this improves audio in Sonic 3 - MD: 68K TAS has a hardware bug that prevents writing the result back to RAM - this fixes Gargoyles - MD: 68K TRAP should not change CPU interrupt level - this fixes Shining Force II, Shining in the Darkness, etc - icarus: better SRAM heuristics for Mega Drive games Todo: - need to serialize the new cartridge ramEnable, ramWritable, bank variables ¹: so technically, the GBA has its FIFO queue (raw PCM), plus a GB chipset. The GB audio runs at 2MHz. However, I was being lazy and running the sequencer 64 times in a row, thus decimating the audio to 32KHz. But simply discarding 63 out of every 64 samples resorts in muddier sound with more static in it. However ... increasing the audio thread processing intensity 64-fold, and requiring heavy-duty three-chain lowpass and highpass filters is not cheap. For this bump in sound quality, we're eating a loss of about 30% of previous performance. Also note that the GB audio emulation in the GBA core still lacks many of the improvements made to the GB core. I was hoping to complete the GB enhancements, but it seems like I'm never going to pass blargg's psychotic edge case tests. So, first I want to clean up the GB audio to my current coding standards, and then I'll port that over to the GBA, which should further increase sound quality. At that point, it sound exceed mGBA's audio quality (due to the ridiculously high sampling rate and strong-attenuation audio filtering.) ²: word writes are probably not handled correctly ... but games are only supposed to do byte writes here. ³: the SRAM mapping is used by games like "Story of Thor" and "Phantasy Star IV." Unfortunately, the former wasn't released in the US and is region protected. So you'll need to change the NTSU to NTSCJ in md/system/system.cpp in order to boot it. But it does work nicely now. The write protection bit is cleared in the game, and then it fails to write to SRAM (soooooooo many games with SRAM write protection do this), so for now I've had to disable checking that bit. Phantasy Star IV has a US release, but sadly the game doesn't boot yet. Hitting some other bug. The bank mapping is pretty much just for the 40mbit Super Street Fighter game. It shows the Sega and Capcom logos now, but is hitting yet another bug and deadlocking. For now, I emulate the SRAM/bank mapping registers on all cartridges, and set sane defaults. So long as games don't write to $a130XX, they should all continue to work. But obviously, we need to get to a point where higan/icarus can selectively enable these registers on a per-game basis. ⁴: so, the Mega Drive has various ways to lock a chip until another chip releases it. The VDP can lock the 68K, the 68K can lock the Z80, etc. If this happens when you save a state, it'll dead-lock the emulator. So that's obviously a problem that needs to be fixed. The fix will be nasty ... basically, bypassing the dead-lock, creating a miniature, one-instruction-long race condition. Extremely unlikely to cause any issues in practice (it's only a little worse than the SNES CPU/SMP desync), but ... there's nothing I can do about it. So you'll have to take it or leave it. But yeah, for now, save states may lock up the emulator. I need to add code to break the loops when in the process of creating a save state still.
2017-03-10 10:23:29 +00:00
}
Update to v102r08 release. byuu says: Changelog: - PCE: restructured VCE, VDCs to run one scanline at a time - PCE: bound VDCs to 1365x262 timing (in order to decouple the VDCs from the VCE) - PCE: the two changes above allow save states to function; also grants a minor speed boost - PCE: added cheat code support (uses 21-bit bus addressing; compare byte will be useful here) - 68K: fixed `mov *,ccr` to read two bytes instead of one [Cydrak] - Z80: emulated /BUSREQ, /BUSACK; allows 68K to suspend the Z80 [Cydrak] - MD: emulated the Z80 executing instructions [Cydrak] - MD: emulated Z80 interrupts (triggered during each Vblank period) [Cydrak] - MD: emulated Z80 memory map [Cydrak] - MD: added stubs for PSG, YM2612 accesses [Cydrak] - MD: improved bus emulation [Cydrak] The PCE core is pretty much ready to go. The only major feature missing is FM modulation. The Mega Drive improvements let us start to see the splash screens for Langrisser II, Shining Force, Shining in the Darkness. I was hoping I could get them in-game, but no such luck. My Z80 implementation is probably flawed in some way ... now that I think about it, I believe I missed the BusAPU::reset() check for having been granted access to the Z80 first. But I doubt that's the problem. Next step is to implement Cydrak's PSG core into the Master System emulator. Once that's in, I'm going to add save states and cheat code support to the Master System core. Next, I'll add the PSG core into the Mega Drive. Then I'll add the 'easy' PCM part of the YM2612. Then the rest of the beastly YM2612 core. Then finally, cap things off with save state and cheat code support. Should be nearing a new release at that point.
2017-02-20 08:13:10 +00:00
Update to v102r17 release. byuu says: Changelog: - GBA: process audio at 2MHz instead of 32KHz¹ - MD: do not allow the 68K to stop the Z80, unless it has been granted bus access first - MD: do not reset bus requested/granted signals when the 68K resets the Z80 - the above two fix The Lost Vikings - MD: clean up the bus address decoding to be more readable - MD: add support for a13000-a130ff (#TIME) region; pass to cartridge I/O² - MD: emulate SRAM mapping used by >16mbit games; bank mapping used by >32mbit games³ - MD: add 'reset pending' flag so that loading save states won't reload 68K PC, SP registers - this fixes save state support ... mostly⁴ - MD: if DMA is not enabled, do not allow CD5 to be set [Cydrak] - this fixes in-game graphics for Ristar. Title screen still corrupted on first run - MD: detect and break sprite lists that form an infinite loop [Cydrak] - this fixes the emulator from dead-locking on certain games - MD: add DC offset to sign DAC PCM samples [Cydrak] - this improves audio in Sonic 3 - MD: 68K TAS has a hardware bug that prevents writing the result back to RAM - this fixes Gargoyles - MD: 68K TRAP should not change CPU interrupt level - this fixes Shining Force II, Shining in the Darkness, etc - icarus: better SRAM heuristics for Mega Drive games Todo: - need to serialize the new cartridge ramEnable, ramWritable, bank variables ¹: so technically, the GBA has its FIFO queue (raw PCM), plus a GB chipset. The GB audio runs at 2MHz. However, I was being lazy and running the sequencer 64 times in a row, thus decimating the audio to 32KHz. But simply discarding 63 out of every 64 samples resorts in muddier sound with more static in it. However ... increasing the audio thread processing intensity 64-fold, and requiring heavy-duty three-chain lowpass and highpass filters is not cheap. For this bump in sound quality, we're eating a loss of about 30% of previous performance. Also note that the GB audio emulation in the GBA core still lacks many of the improvements made to the GB core. I was hoping to complete the GB enhancements, but it seems like I'm never going to pass blargg's psychotic edge case tests. So, first I want to clean up the GB audio to my current coding standards, and then I'll port that over to the GBA, which should further increase sound quality. At that point, it sound exceed mGBA's audio quality (due to the ridiculously high sampling rate and strong-attenuation audio filtering.) ²: word writes are probably not handled correctly ... but games are only supposed to do byte writes here. ³: the SRAM mapping is used by games like "Story of Thor" and "Phantasy Star IV." Unfortunately, the former wasn't released in the US and is region protected. So you'll need to change the NTSU to NTSCJ in md/system/system.cpp in order to boot it. But it does work nicely now. The write protection bit is cleared in the game, and then it fails to write to SRAM (soooooooo many games with SRAM write protection do this), so for now I've had to disable checking that bit. Phantasy Star IV has a US release, but sadly the game doesn't boot yet. Hitting some other bug. The bank mapping is pretty much just for the 40mbit Super Street Fighter game. It shows the Sega and Capcom logos now, but is hitting yet another bug and deadlocking. For now, I emulate the SRAM/bank mapping registers on all cartridges, and set sane defaults. So long as games don't write to $a130XX, they should all continue to work. But obviously, we need to get to a point where higan/icarus can selectively enable these registers on a per-game basis. ⁴: so, the Mega Drive has various ways to lock a chip until another chip releases it. The VDP can lock the 68K, the 68K can lock the Z80, etc. If this happens when you save a state, it'll dead-lock the emulator. So that's obviously a problem that needs to be fixed. The fix will be nasty ... basically, bypassing the dead-lock, creating a miniature, one-instruction-long race condition. Extremely unlikely to cause any issues in practice (it's only a little worse than the SNES CPU/SMP desync), but ... there's nothing I can do about it. So you'll have to take it or leave it. But yeah, for now, save states may lock up the emulator. I need to add code to break the loops when in the process of creating a save state still.
2017-03-10 10:23:29 +00:00
auto APU::reset() -> void {
Update to v103r02 release. byuu says: Changelog: - fc/apu: improved phase duty cycle emulation (mode 3 is 25% phase inverted; counter decrements) - md/apu: power/reset do not cancel 68K bus requests - md/apu: 68K is not granted bus access on Z80 power/reset - md/controller: replaced System::Peripherals with ControllerPort concept - md/controller: CTRL port is now read-write, maintains value across controller changes (and soon, soft resets) - md/psg: PSG sampling rate unintentionally modified¹ - processor/spc700: improve cycle timing of (indirect),y instructions [Overload] - processor/spc700: idle() cycles actually read from the program counter; much like the 6502 [Overload] - some of the idle() cycles should read from other addresses; this still needs to be supported - processor/spc700: various cleanups to instruction function naming - processor/z80: prefix state (HL→IX,IY override) can now be serialized - icarus: fix install rule for certain platforms (it wasn't buggy on FreeBSD, but was on Linux?) ¹: the clock speed of the PSG is oscillator/15. But I was setting the sampling rate to oscillator/15/16, which was around 223KHz. I am not sure whether the PSG should be outputting at 3MHz or 223KHz. Amazingly ... I don't really hear a difference either way `o_O` I didn't actually mean to make this change; I just noticed it after comparing the diff between r01 and r02. If this turns out to be wrong, set stream = Emulator::audio.createStream(1, frequency() / 16.0); in md/psg.cpp to revert this change.
2017-06-27 01:18:28 +00:00
Z80::power();
bus->grant(false);
create(APU::Enter, system.frequency() / 15.0);
state = {};
}
Update to v100r02 release. byuu says: Sigh ... I'm really not a good person. I'm inherently selfish. My responsibility and obligation right now is to work on loki, and then on the Tengai Makyou Zero translation, and then on improving the Famicom emulation. And yet ... it's not what I really want to do. That shouldn't matter; I should work on my responsibilities first. Instead, I'm going to be a greedy, self-centered asshole, and work on what I really want to instead. I'm really sorry, guys. I'm sure this will make a few people happy, and probably upset even more people. I'm also making zero guarantees that this ever gets finished. As always, I wish I could keep these things secret, so if I fail / give up, I could just drop it with no shame. But I would have to cut everyone out of the WIP process completely to make it happen. So, here goes ... This WIP adds the initial skeleton for Sega Mega Drive / Genesis emulation. God help us. (minor note: apparently the new extension for Mega Drive games is .md, neat. That's what I chose for the folders too. I thought it was .smd, so that'll be fixed in icarus for the next WIP.) (aside: this is why I wanted to get v100 out. I didn't want this code in a skeleton state in v100's source. Nor did I want really broken emulation, which the first release is sure to be, tarring said release.) ... So, basically, I've been ruminating on the legacy I want to leave behind with higan. 3D systems are just plain out. I'm never going to support them. They're too complex for my abilities, and they would run too slowly with my design style. I'm not willing to compromise my design ideals. And I would never want to play a 3D game system at native 240p/480i resolution ... but 1080p+ upscaling is not accurate, so that's a conflict I want to avoid entirely. It's also never going to emulate computer systems (X68K, PC-98, FM-Towns, etc) because holy shit that would completely destroy me. It's also never going emulate arcade machines. So I think of higan as a collection of 2D emulators for consoles and handhelds. I've gone over every major 2D gaming system there is, looking for ones with games I actually care about and enjoy. And I basically have five of those systems supported already. Looking at the remaining list, I see only three systems left that I have any interest in whatsoever: PC-Engine, Master System, Mega Drive. Again, I'm not in any way committing to emulating any of these, but ... if I had all of those in higan, I think I'd be content to really, truly, finally stop writing more emulators for the rest of my life. And so I decided to tackle the most difficult system first. If I'm successful, the Z80 core should cover a lot of the work on the SMS. And the HuC6280 should land somewhere between the NES and SNES in terms of difficulty ... closer to the NES. The systems that just don't appeal to me at all, which I will never touch, include, but are not limited to: * Atari 2600/5200/7800 * Lynx * Jaguar * Vectrex * Colecovision * Commodore 64 * Neo-Geo * Neo-Geo Pocket / Color * Virtual Boy * Super A'can * 32X * CD-i * etc, etc, etc. And really, even if something were mildly interesting in there ... we have to stop. I can't scale infinitely. I'm already way past my limit, but I'm doing this anyway. Too many cores bloats everything and kills quality on everything. I don't want higan to become MESS v2. I don't know what I'll do about the Famicom Disk System, PC-Engine CD, and Mega CD. I don't think I'll be able to achieve 60fps emulating the Mega CD, even if I tried to. I don't know what's going to happen here with even the Mega Drive. Maybe I'll get driven crazy with the documentation and quit. Maybe it'll end up being too complicated and I'll quit. Maybe the emulation will end up way too slow and I'll give up. Maybe it'll take me seven years to get any games playable at all. Maybe Steve Snake, AamirM and Mike Pavone will pool money to hire a hitman to come after me. Who knows. But this is what I want to do, so ... here goes nothing.
2016-07-09 04:21:37 +00:00
}