APEX for arm64-v8a
chege011 opened this issue · 21 comments
Is there any possible to compile APEX for android arm64-v8a correctly?
I build arm64-v8a with cmake and compile successful. But when I integrate it into UE4, there is something wrong with cloth simulation.
By the way, when I use armeabi-v7a with NEON, the simulation is correct. So, if there is something wrong with arm64-v8a without definding ARM_NEON?
I try to add ARM_NEON when compiling arm64-v8a, but I got a compilation wrong.
I manage to get this thing done.
I manage to compile apex arm64-v8a without neon. However, it seems that cloth simulation using nvcloth is very slow on Android.
I found that it uses Scalar4f without NEON and Simd4f with NEON. Is that relevant to the speed of cloth simulation?
If so, how can I successfully compile arm64-v8a with NEON.
I'm not sure if you are talking about NvCloth or APEX now.
It is expected that disabling NEON would cause a slow down, as those are the simd instructions used on arm to improve floating point performance.
I am trying to integrate apex and nvcloth in UE4 for android.But I found something wrong with Apex and Nvcloth.When I use armv8 with neon(meaning nvcloth and apex are all compiled on armv8 with neon), I found cloth with animation will become black. This error didn't occurre on armv7 with neon.
I would suggest using the default UE4 integration of NvCloth. If that still causes problems you should file a bug with Epic Games.
Default UE4 nvcloth does not support android.I have to upgrade nvcloth and apex to the newest version. What I am trying to say, if there is anyway I can compile Nvcloth and Apex right on arnv8 with neon? Is there any specific macro I need to add? I have already made them right for android on armv7 with NEON and armv8 without NENO, only left for armv8 with NEON.
The default config of NvCloth should compile for armv8 with NEON if I remember correctly.
Are you trying to update the existing UE4 integration?
Did you ask Epic Games about running clothing on android?
You are right, defaut is armv8 with neon.
For EPIC, no, I have no idea where to ask.
Is there any way I can send my research to your guys? It will be easier to ask question. I changed some files in order to compile armv8 with neon for APEX. However, I am not totally sure that I change them in the right.(Not compilation error, but maybe logical error).
I'm only responsible for NvCloth.
Apex is deprecated, so I don't think we are taking any changes to that anymore.
Maybe someone else can comment in more detail about APEX. @sschirm ?
I second that, we can't really provide support for porting APEX to newer platforms unfortunately.
What are you using APEX for, if not for clothing?
I am just trying to integrate APEX in UE4. And I have checked that UE4 use APEX for storing Cloth data(maybe, but I am sure it need APEX in Cloth Simulation).
I have already compiled armv7 with neon. When I try to compile armv8 with neon, I have to change APEX_1.4\module\clothing\embedded\LowLevelCloth\src\neon\SwCollisionHelpers.h. In line 54 and 75 with arm64 macro, function vtbl1q_u8 and vtbl2q_u8 are not found in
android-ndk-r12b\toolchains\aarch64-linux-android-4.9\prebuilt\windows-x86_64\lib\gcc\aarch64-linux-android\4.9.x\include\arm_neon.h.
So, I comment the macro for armv8 with neon compilation.
Does this change have some bad impact on cloth simulation?
Let me make my problem clearly.
First, when I integrated armv7a with NEON(include APEX and NvCloth) in UE4, all things were right.
Second, when I integrated armv8a with NEON(only NvCloth compiled with NEON, APEX compiled without NEON), I found something wrong.
- Cloth without bones and animation simulated and appeared right.
- Cloth with bones and animation simulated wrong. I mean sometime the cloth mesh just disappear and sometime the cloth exist but obviously simulated wrong.
Third, when I integrated armv8a without NEON(NvCloth without NEON, with SwSolver.cpp changed and use SwSolverKernel(*mCloth, data, allocator, factory)(), APEX compiled without NEON), this time, everything are back to the right place(simulated right and appeared right).
Accroding to those phenomenons, I am totaly confused about why it is not working in Second case. Is there something logically difference between armv7a with NEON and armv8a with NEON?
By the way, for pc, all things are right.
Have you solved the problem? I have the same as you..
Is the armv8a with NEON problem?
I didn't solve that.
By the way, I manage to make armv7a with NEON and armv8a without NEON right.
oh.. the armv8a with NEON can not simulate correctly. The cloth mesh disappear.
armv7a with NEON is right.
I will try armv8a without NEON..
Thanks.
By the way, I was using UE4 4.21 at that time.
By the way, I was using UE4 4.21 at that time.
Hi, i am doing ue4 cloth simulation, could you provide the APEX arm64-v8a without NEON lib？or could you tell me how
to compile? thank you.
@chege011
Hi，Is your problem finally solved?
I upgraded nvcloth to the latest version, there is no effect of cloth simulation on Android? Only met?
@chege011 Hi，Is your problem finally solved? I upgraded nvcloth to the latest version, there is no effect of cloth simulation on Android? Only met?
I think only deal with nvcloth might not be able to solve the cloth simulation issue... just as above mentioned above... and I have tried all day, no luck to compile apex for arm64... hope there will be a solution ...
Hello, Sorry for up an old post but have you found any solution to compile clothing simulation for android ?