Commit Graph

30 Commits

Author SHA1 Message Date
Lioncash 5635d4b709 Fifo: Make SyncGPUReason an enum class 2016-08-18 22:35:58 -04:00
Pierre Bourdon 3570c7f03a Reformat all the things. Have fun with merge conflicts. 2016-06-24 10:43:46 +02:00
Lioncash 488e7bd46a Fifo: Get rid of undefined global
This declaration doesn't have a matching implementation
so it can be removed entirely.
2016-01-25 05:24:03 -05:00
Lioncash 32ce2be2bf Fifo: Make g_use_deterministic_gpu_thread a TU-local variable 2016-01-25 05:24:03 -05:00
Lioncash 5ebd1e215b Fifo: Make g_bSkipCurrentFrame a TU-local variable
This is only ever queried, making it a global isn't necessary.
2016-01-25 05:23:14 -05:00
degasus cf4478dc92 Fifo: Fix SyncGPU.
CBoot::BootUp() did call CoreTiming::Advance which itself blocks on the GPU,
but the GPU thread wasn't started already. This commit moves the SyncGPU
initialization into the Fifo.cpp file and call it after BootUp().
2016-01-24 11:06:01 +01:00
Lioncash d9fec92628 VideoCommon: Header cleanup
Also remedies places where the video backends and core rely on things
being indirectly included.
2016-01-17 20:11:45 -05:00
degasus 5f244abf28 Fifo: Create a "Fifo" namespace. 2016-01-12 23:28:26 +01:00
Lioncash a8ab156a29 Fifo: Convert define into constant
Also moves it to the cpp file where it's used.
2015-12-25 16:07:04 -05:00
degasus c375111076 Options: merge SCoreStartupParameter into SConfig 2015-06-12 19:07:45 +02:00
degasus d31bed8b79 Fifo: Rewrite SyncGpu
The new implementation has 3 options:
 SyncGpuMaxDistance
 SyncGpuMinDistance
 SyncGpuOverclock

The MaxDistance controlls how many CPU cycles the CPU is allowed to be in front
of the GPU. Too low values will slow down extremly, too high values are as
unsynchronized and half of the games will crash.
The -MinDistance (negative) set how many cycles the GPU is allowed to be in
front of the CPU. As we are used to emulate an infinitiv fast GPU, this may be
set to any high (negative) number.

The last parameter is to hack a faster (>1.0) or slower(<1.0) GPU. As we don't
emulate GPU timing very well (eg skip the timings of the pixel stage completely),
an overclock factor of ~0.5 is often much more accurate than 1.0
2015-06-08 23:16:24 +02:00
degasus 02a3a063c3 Fifo: Extract syncing loop
It's now a new helper function within common.
2015-05-30 12:58:09 +02:00
Tillmann Karras 30ebb2459e Set copyright year to when a file was created 2015-05-25 13:22:31 +02:00
Tillmann Karras cefcb0ace9 Update license headers to GPLv2+ 2015-05-25 13:22:31 +02:00
degasus b020ae1c5d Fifo: rewrite sync on idle skipping hack
Now it's done without a busy loop
2015-04-06 12:35:35 +02:00
Tillmann Karras 9493c713dd Fifo: small cleanup 2015-02-28 15:40:01 +01:00
Tillmann Karras e28c97f6bd Fifo: drop unused functions 2015-02-28 15:40:00 +01:00
degasus b35fa222f5 VideoCommon: perf querys by async events 2015-02-22 08:41:15 +01:00
degasus 4b22885ed8 VideoCommon: fifo cleanups 2014-12-09 18:56:27 +01:00
degasus c211450b99 OGL: implement bounding box support with ssbo
This implemention tries to be as accurate as the old SW implemention, but it will remove the dependcy of our vertexloader on videosw.
2014-11-17 21:20:32 +01:00
Lioncash 16a74a9557 Fifo: Fix tab/space mismatches 2014-10-06 20:04:57 -04:00
comex 3a2048ea57 Add a central variable g_want_determinism which controls whether to try to make things deterministic.
It now affects the GPU determinism mode as well as some miscellaneous
things that were calling IsNetPlayRunning.  Probably incomplete.

Notably, this can change while paused, if the user starts recording a
movie.  The movie code appears to have been missing locking between
setting g_playMode and doing other things, which probably had a small
chance of causing crashes or even desynced movies; fix that with
PauseAndLock.

The next commit will add a hidden config variable to override GPU
determinism mode.
2014-09-28 21:34:31 -04:00
comex 65af90669b Add the 'desynced GPU thread' mode.
It's a relatively big commit (less big with -w), but it's hard to test
any of this separately...

The basic problem is that in netplay or movies, the state of the CPU
must be deterministic, including when the game receives notification
that the GPU has processed FIFO data.  Dual core mode notifies the game
whenever the GPU thread actually gets around to doing the work, so it
isn't deterministic.  Single core mode is because it notifies the game
'instantly' (after processing the data synchronously), but it's too slow
for many systems and games.

My old dc-netplay branch worked as follows: everything worked as normal
except the state of the CP registers was a lie, and the CPU thread only
delivered results when idle detection triggered (waiting for the GPU if
they weren't ready at that point).  Usually, a game is idle iff all the
work for the frame has been done, except for a small amount of work
depending on the GPU result, so neither the CPU or the GPU waiting on
the other affected performance much.  However, it's possible that the
game could be waiting for some earlier interrupt, and any of several
games which, for whatever reason, never went into a detectable idle
(even when I tried to improve the detection) would never receive results
at all.  (The current method should have better compatibility, but it
also has slightly higher overhead and breaks some other things, so I
want to reimplement this, hopefully with less impact on the code, in the
future.)

With this commit, the basic idea is that the CPU thread acts as if the
work has been done instantly, like single core mode, but actually hands
it off asynchronously to the GPU thread (after backing up some data that
the game might change in memory before it's actually done).  Since the
work isn't done, any feedback from the GPU to the CPU, such as real
XFB/EFB copies (virtual are OK), EFB pokes, performance queries, etc. is
broken; but most games work with these options disabled, and there is no
need to try to detect what the CPU thread is doing.

Technically: when the flag g_use_deterministic_gpu_thread (currently
stuck on) is on, the CPU thread calls RunGpu like in single core mode.
This function synchronously copies the data from the FIFO to the
internal video buffer and updates the CP registers, interrupts, etc.
However, instead of the regular ReadDataFromFifo followed by running the
opcode decoder, it runs ReadDataFromFifoOnCPU ->
OpcodeDecoder_Preprocess, which relatively quickly scans through the
FIFO data, detects SetFinish calls etc., which are immediately fired,
and saves certain associated data from memory (e.g. display lists) in
AuxBuffers (a parallel stream to the main FIFO, which is a bit slow at
the moment), before handing the data off to the GPU thread to actually
render.  That makes up the bulk of this commit.

In various circumstances, including the aforementioned EFB pokes and
performance queries as well as swap requests (i.e. the end of a frame -
we don't want the CPU potentially pumping out frames too quickly and the
GPU falling behind*), SyncGPU is called to wait for actual completion.

The overhead mainly comes from OpcodeDecoder_Preprocess (which is,
again, synchronous), as well as the actual copying.

Currently, display lists and such are escrowed from main memory even
though they usually won't change over the course of a frame, and
textures are not even though they might, resulting in a small chance of
graphical glitches.  When the texture locking (i.e. fault on write) code
lands, I can make this all correct and maybe a little faster.

* This suggests an alternate determinism method of just delaying results
until a short time before the end of each frame.  For all I know this
might mostly work - I haven't tried it - but if any significant work
hinges on the competion of render to texture etc., the frame will be
missed.
2014-09-28 21:34:29 -04:00
comex 2d4b7c5900 Make ReadDataFromFifo static. 2014-09-28 21:25:12 -04:00
Rohit Nirmal fbc64984ca Include CommonTypes.h instead of Common.h. 2014-09-08 15:39:58 -04:00
degasus 8b84ddce9a VideoCommon: rewrite frame skipping code 2014-09-04 18:07:39 +02:00
degasus 22e1aa5bb4 mark all local functions as static 2014-07-11 16:07:23 +02:00
Lioncash 2afe215271 Convert all includes to relative paths. 2014-02-18 02:19:10 -05:00
lioncash d2038049f5 Replace all include guard ifdefs with "#pragma once" 2014-02-10 18:07:16 -05:00
Jasper St. Pierre 34692ab826 Remove unnecessary Src/ folders 2013-12-31 14:03:19 -05:00