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bsnes/higan/md/psg/psg.cpp

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Update to v100r03 release. byuu says: Changelog: - moved Thread, Scheduler, Cheat functionality into emulator/ for all cores - start of actual Mega Drive emulation (two 68K instructions) I'm going to be rather terse on MD emulation, as it's too early for any meaningful dialogue here.
2016-07-10 05:28:26 +00:00
#include <md/md.hpp>
namespace MegaDrive {
PSG psg;
auto PSG::Enter() -> void {
while(true) scheduler.synchronize(), psg.main();
}
auto PSG::main() -> void {
Update to v101r12 release. byuu says: Changelog: - new md/bus/ module for bus reads/writes - abstracts byte/word accesses wherever possible (everything but RAM; forces all but I/O to word, I/O to byte) - holds the system RAM since that's technically not part of the CPU anyway - added md/controller and md/system/peripherals - added emulation of gamepads - added stub PSG audio output (silent) to cap the framerate at 60fps with audio sync enabled - fixed VSRAM reads for plane vertical scrolling (two bugs here: add instead of sub; interlave plane A/B) - mask nametable read offsets (can't exceed 8192-byte nametables apparently) - emulated VRAM/VSRAM/CRAM reads from VDP data port - fixed sprite width/height size calculations - added partial emulation of 40-tile per scanline limitation (enough to fix Sonic's title screen) - fixed off-by-one sprite range testing - fixed sprite tile indexing - Vblank happens at Y=224 with overscan disabled - unsure what happens when you toggle it between Y=224 and Y=240 ... probably bad things - fixed reading of address register for ADDA, CMPA, SUBA - fixed sign extension for MOVEA effect address reads - updated MOVEM to increment the read addresses (but not writeback) for (aN) mode With all of that out of the way, we finally have Sonic the Hedgehog (fully?) playable. I played to stage 1-2 and through the special stage, at least. EDIT: yeah, we probably need HIRQs for Labyrinth Zone. Not much else works, of course. Most games hang waiting on the Z80, and those that don't (like Altered Beast) are still royally screwed. Tons of features still missing; including all of the Z80/PSG/YM2612. A note on the perihperals this time around: the Mega Drive EXT port is basically identical to the regular controller ports. So unlike with the Famicom and Super Famicom, I'm inheriting the exension port from the controller class.
2016-08-21 22:11:24 +00:00
stream->sample(0.0, 0.0);
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
step(1);
Update to v100r03 release. byuu says: Changelog: - moved Thread, Scheduler, Cheat functionality into emulator/ for all cores - start of actual Mega Drive emulation (two 68K instructions) I'm going to be rather terse on MD emulation, as it's too early for any meaningful dialogue here.
2016-07-10 05:28:26 +00:00
}
auto PSG::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 v100r03 release. byuu says: Changelog: - moved Thread, Scheduler, Cheat functionality into emulator/ for all cores - start of actual Mega Drive emulation (two 68K instructions) I'm going to be rather terse on MD emulation, as it's too early for any meaningful dialogue here.
2016-07-10 05:28:26 +00:00
}
auto PSG::power() -> void {
Update to v101r12 release. byuu says: Changelog: - new md/bus/ module for bus reads/writes - abstracts byte/word accesses wherever possible (everything but RAM; forces all but I/O to word, I/O to byte) - holds the system RAM since that's technically not part of the CPU anyway - added md/controller and md/system/peripherals - added emulation of gamepads - added stub PSG audio output (silent) to cap the framerate at 60fps with audio sync enabled - fixed VSRAM reads for plane vertical scrolling (two bugs here: add instead of sub; interlave plane A/B) - mask nametable read offsets (can't exceed 8192-byte nametables apparently) - emulated VRAM/VSRAM/CRAM reads from VDP data port - fixed sprite width/height size calculations - added partial emulation of 40-tile per scanline limitation (enough to fix Sonic's title screen) - fixed off-by-one sprite range testing - fixed sprite tile indexing - Vblank happens at Y=224 with overscan disabled - unsure what happens when you toggle it between Y=224 and Y=240 ... probably bad things - fixed reading of address register for ADDA, CMPA, SUBA - fixed sign extension for MOVEA effect address reads - updated MOVEM to increment the read addresses (but not writeback) for (aN) mode With all of that out of the way, we finally have Sonic the Hedgehog (fully?) playable. I played to stage 1-2 and through the special stage, at least. EDIT: yeah, we probably need HIRQs for Labyrinth Zone. Not much else works, of course. Most games hang waiting on the Z80, and those that don't (like Altered Beast) are still royally screwed. Tons of features still missing; including all of the Z80/PSG/YM2612. A note on the perihperals this time around: the Mega Drive EXT port is basically identical to the regular controller ports. So unlike with the Famicom and Super Famicom, I'm inheriting the exension port from the controller class.
2016-08-21 22:11:24 +00:00
create(PSG::Enter, 52'000); //system.colorburst());
stream = Emulator::audio.createStream(2, 52'000.0);
Update to v100r03 release. byuu says: Changelog: - moved Thread, Scheduler, Cheat functionality into emulator/ for all cores - start of actual Mega Drive emulation (two 68K instructions) I'm going to be rather terse on MD emulation, as it's too early for any meaningful dialogue here.
2016-07-10 05:28:26 +00:00
}
}