Ray marching distance fields in real-time on the CPU

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randall

Joined: 03 Dec 2011
Posts: 155
Location: Poland

randall

Hi,

I have implemented program that renders simple 3D scene in real-time on the CPU. Program requires CPU with AVX2 and FMA3 instruction sets support (Haswell and newer).
It takes about 25 ms to render one frame on Haswell i7 (40 FPS).

Screenshot and code attached.

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Last edited by randall on 13 Aug 2015, 09:49; edited 2 times in total

28 Apr 2015, 18:54

tthsqe

Joined: 20 May 2009
Posts: 724

tthsqe

Very nice - i get 16fps on my dual core HT lappy.

29 Apr 2015, 01:39

randall

Joined: 03 Dec 2011
Posts: 155
Location: Poland

randall

tthsqe wrote:

Very nice - i get 16fps on my dual core HT lappy.

Thanks tthsqe. The next step is to render Quaternion Julia Sets.
And my longer term plan is to implement path tracing and render fractals with global illumination (not in real-time of course).

Can I ask what are you working on currently?

BTW, your Mandelbox is amazing and motivates me to work harder on my own stuff Smile

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29 Apr 2015, 06:54

macgub

Joined: 11 Jan 2006
Posts: 237
Location: Poland

macgub

Unhappily my cpu don't support AVX2 and FMA3. I'm sad. Crying or Very sad

29 Apr 2015, 07:46

tthsqe

Joined: 20 May 2009
Posts: 724

tthsqe

Code:

Can I ask what are you working on currently?

No much - I am too lazy these days to do too much programming. I am slowly building a chess gui+engine. Would you like to see the code for the program that made those movies?

07 May 2015, 18:12

randall

Joined: 03 Dec 2011
Posts: 155
Location: Poland

randall

tthsqe wrote:

Would you like to see the code for the program that made those movies?

Yes, sure.

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08 May 2015, 08:21

80286

Joined: 01 May 2015
Posts: 15

80286

macgub wrote:

Unhappily my cpu don't support AVX2 and FMA3. I'm sad.

I don't know wether my CPU supports them or not.
qjulia.asm compiles without errors using FASM 1.71.39, but if I try to run it it crashes.
Win8.1, Pentium Dual-Core E5300@2.6GHz 1.6 Ghz, 4GiB installed RAM

08 May 2015, 10:18

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 17248
Location: In your JS exploiting you and your system

revolution

80286 wrote:

macgub wrote:
Unhappily my cpu don't support AVX2 and FMA3. I'm sad.

I don't know wether my CPU supports them or not.
qjulia.asm compiles without errors using FASM 1.71.39, but if I try to run it it crashes.
Win8.1, Pentium Dual-Core E5300@2.6GHz 1.6 Ghz, 4GiB installed RAM

It does not.

When fasm compiles it doesn't use any instructions beyond 80386. So fasm can always compile even the newest instructions as long as your CPU is 80386 or later.

08 May 2015, 10:23

80286

Joined: 01 May 2015
Posts: 15

80286

revolution wrote:

It does not

Thanks for clearing that. I am preparing to get an actual PC who can use those instruction sets.

08 May 2015, 11:11

tthsqe

Joined: 20 May 2009
Posts: 724

tthsqe

I am adding the mandelbox code to github. It is probably incomplete and some of the comments might be wrong, Laughing

but you can compare how I did some things.
https://github.com/tthsqe12/mandelbox

I'm currently working on some dense algorithmic programs and have switched to c++ now that I have understood that compiler. I hope this board doesn't view me as a traitor.

27 Jul 2015, 05:05

typedef

Joined: 25 Jul 2010
Posts: 2913
Location: 0x77760000

typedef

Yup. Crashes here too. Something isn't supported I guess.

Win7 Ultimate 9GB RAM

27 Jul 2015, 12:53

randall

Joined: 03 Dec 2011
Posts: 155
Location: Poland

randall

tthsqe wrote:

I am adding the mandelbox code to github. It is probably incomplete and some of the comments might be wrong,
but you can compare how I did some things.
https://github.com/tthsqe12/mandelbox

I'm currently working on some dense algorithmic programs and have switched to c++ now that I have understood that compiler. I hope this board doesn't view me as a traitor.

Thanks for the info.
I'm currently working on distance field rendering in C++ and DX12. GPUs are so much faster for this kind of stuff...

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28 Jul 2015, 19:59

randall

Joined: 03 Dec 2011
Posts: 155
Location: Poland

randall

typedef wrote:

Yup. Crashes here too. Something isn't supported I guess.

Win7 Ultimate 9GB RAM

Program requires CPU with AVX2 and FMA3 instruction sets support (Haswell and newer).

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28 Jul 2015, 20:02

Kevin_Zheng

Joined: 04 Jul 2003
Posts: 125
Location: China

Kevin_Zheng

Hi, Randall:
It's very cool, but it will crash in my win7 64bit os. it seem that the WIN64 program need align the stack address to quard word align before executed call instruction. You only added align instuction into the source code, but it only work in complier time, it can't sure that it's okay in the run time . So it will crash sometimes in WIN7 64bit OS.

Thanks.

Kenneth Zheng

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29 Jul 2015, 00:49

randall

Joined: 03 Dec 2011
Posts: 155
Location: Poland

randall

Kevin_Zheng wrote:

Hi, Randall:
It's very cool, but it will crash in my win7 64bit os. it seem that the WIN64 program need align the stack address to quard word align before executed call instruction. You only added align instuction into the source code, but it only work in complier time, it can't sure that it's okay in the run time . So it will crash sometimes in WIN7 64bit OS.

Thanks.

Kenneth Zheng

rsp alingment is ok (I'm keeping it aligned all the time by substracting aproperiate valu from rsp register).

What CPU do you have?

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29 Jul 2015, 10:30

Kevin_Zheng

Joined: 04 Jul 2003
Posts: 125
Location: China

Kevin_Zheng

Hi, Randall:
The CPU type is the Intel Core I7-5500U CPU @2.4GHZ.

Thanks.

Kenneth Zheng

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29 Jul 2015, 14:52

randall

Joined: 03 Dec 2011
Posts: 155
Location: Poland

randall

Kevin_Zheng wrote:

Hi, Randall:
The CPU type is the Intel Core I7-5500U CPU @2.4GHZ.

Thanks.

Kenneth Zheng

Windows fails to create 8 threads on the machine without HT (in this particular case). Try to change k_thrd_count to 4.

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29 Jul 2015, 19:56

Kevin_Zheng

Joined: 04 Jul 2003
Posts: 125
Location: China

Kevin_Zheng

Quote:

Randa Wrote:
Windows fails to create 8 threads on the machine without HT (in this particular case). Try to change k_thrd_count to 4.

Hi, Randall:
Yes, you are right, when I change the k_thrd_count from 8 to 4, it worked normally in win7 64 BIT OS.

Thanks.

Kenneth Zheng

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29 Jul 2015, 23:57

randall

Joined: 03 Dec 2011
Posts: 155
Location: Poland

randall

I have uploaded new version that:

* Displays error message when AVX2, FMA extensions are not supported.
* Creates X threads where X is equal to the number of logical processors present on the machine.

Thanks,
Michal

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13 Aug 2015, 09:53

randall

Joined: 03 Dec 2011
Posts: 155
Location: Poland

randall

Kenneth Zheng,

How many FPS do you get on your machine?

Thanks.

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13 Aug 2015, 10:04

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