Re: [osg-users] FBO Rendering

[J.P. Delport]

Hi,

Роман Григорьев wrote:
I integrate your last example with my cellular automata and have some results 
my approach 100 fps no fbo switching 2 cameras.
What does your approach do? Rebind targets?
your approach 70 fps with fbo switching 1 camera.
maybe switching fbo is very costly to OGL state mashine?
This is quite possible yes.

As far as I can see there are 3 approaches:
1 single FBO, static target, switch using target buffer (glDrawBuffer/s)
2 single FBO, rebind targets, static target buffer
3 dual FBO, static targets, static target buffer

1 is probably fastest, but difficult to do in current OSG.
2 is in between, maybe doable in current OSG.
3 is probably slowest, but easy to do in current OSG.

Roman

jp



-----Original Message-----
From: osg-users-bounces @lists.openscenegraph.org [mailto:[EMAIL PROTECTED] On 
Behalf Of J.P. Delport
Sent: Wednesday, May 21, 2008 1:29 PM
To: OpenSceneGraph Users
Subject: Re: [osg-users] FBO Rendering

Hi,

please use the latest example.

The first one I sent has some problems: it makes mistakes in reading 
some input texture values because the textures are bound as input and 
output. Multiple runs of the example gave multiple results, but the 
results should be the same every time. The latest example gives the same 
results every time.

jp

Роман Григорьев wrote:
Thanx JP. Sorry for my mistake (forget about texture coordinates in fragment 
shader that differ from texture rectangle to texture2D) but all your example 
works fine and have same framerate 1000 fps.
I try to modify my example to see my framerates to choose method of rendering.
Thanx 
Bye
Roman
 

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of J.P. Delport
Sent: Wednesday, May 21, 2008 12:28 PM
To: OpenSceneGraph Users
Subject: Re: [osg-users] FBO Rendering

Hi, 

attached is the new version of the example. I think this should work fine with 
Texture2D as well. No MRT is used, only two FBO's that are switched between 
frames.

Hope this helps.

regards
jp

J.P. Delport wrote:
Hi,

I think my example does not use FBO in the correct way. It does not 
seem to be good to attach textures as both input and output. For 
example in my demo the output is not always the same.

I have made a new example that uses two cameras with switches above 
them to do ping-pong and this works much better. I get the same 
results every time.

See here for good explanation of ping-pong:
http://www.mathematik.uni-dortmund.de/~goeddeke/gpgpu/tutorial.html#fe
edback2


The new example uses the first method described here:
"Use one FBO with one attachment per texture that is rendered to, and 
bind a different FBO in each rendering pass."

I will send this soon. Just cleaning it up.

jp

Роман Григорьев wrote:
Hi!
Today I tried to adapt you example to texture2D as input textures and 
rendertargets but no luck. With texture2Drect works fine but with 
texture2d it doesn’t work at all. I use 8600GT under vista with 174 
drivers(osg svn) Roman
 

-----Original Message-----
From: [EMAIL PROTECTED] 
[mailto:[EMAIL PROTECTED] On Behalf Of J.P. 
Delport
Sent: Tuesday, May 20, 2008 5:29 PM
To: OpenSceneGraph Users
Subject: Re: [osg-users] FBO Rendering

Hi Roman,

attached is an example I made that uses ping-pong rendering. It tries 
to simulate the game of life, see e.g.

http://en.wikipedia.org/wiki/Conway's_Game_of_Life

Each iteration depends on the previous one.

I hope the code makes sense. At least the output looks pretty :)

regards
jp

Роман Григорьев wrote:
Sorry guys for my f**king outlook
Here is shaders and source u can take from 1-st message Roman


-----Original Message-----
From: [EMAIL PROTECTED] 
[mailto:[EMAIL PROTECTED] On Behalf Of J.P. 
Delport
Sent: Tuesday, May 20, 2008 2:17 PM
To: OpenSceneGraph Users
Subject: Re: [osg-users] FBO Rendering

Hi,

sorry, I cannot read the attachments in your mail. I will try to make 
a simple ping-pong example instead.

jp

Roman Grigoriev wrote:
Here is my shaders. It's shaders from my current version that do not 
use MRT. Source code you can take from my previous message<ÎÅÉIf you 
want to have my setup with FBO MRT just email me. 
<ÎÅÉ<ÎÅÉ<ÎÅÉ<ÎÅÉ-----Original Message-----<ÎÅÉFrom: 
[EMAIL PROTECTED] 
[mailto:[EMAIL PROTECTED] On Behalf Of 
J.P. Delport<ÎÅÉSent: Tuesday, May 20, 2008 1:46 PM<ÎÅÉTo: 
OpenSceneGraph Users<ÎÅÉSubject: Re: [osg-users] FBO 
Rendering<ÎÅÉ<ÎÅÉHi,<ÎÅÉ<ÎÅÉòÏÍÁÎ çÒÉÇÏÒØÅ× wrote:<ÎÅÉ> Hi I try to 
implement cellular automata clouds on OSG and have some problem<ÎÅÉ> 
<ÎÅÉ> 1) I can't use (or don't know)  ping-pong rendering technique 
as <ÎÅÉ> described here 
http://www.m3xbox.com/GPU_blog/?m=200712<ÎÅÉ> <ÎÅÉ> Because when I 
attach 2 textures to camera FBO in rendering loop camera <ÎÅÉ> 
render to 2 FBO but I need to change dynamically which draw buffer I 
<ÎÅÉ> need to draw/ <ÎÅÉ<ÎÅÉCan you not also pass the draw buffer as 
a uniform to the shader and <ÎÅÉthen use that in glFragData[buffer] 
call? This can select which of two <ÎÅÉtextures to render 
to.<ÎÅÉ<ÎÅÉ> I've red about RenderStage but how to control it is 
<ÎÅÉ> unclear for me. I've make a workaround that create another 
camera that <ÎÅÉ> render FBO texture to another FBO texture that can 
I attach in 1 stage <ÎÅÉ> to calculate cellular automata.<ÎÅÉ<ÎÅÉIf 
you have the same shader code for both cameras, I think you can get 
<ÎÅÉaway with only a single camera and multiple targets.<ÎÅÉ<ÎÅÉ> 
<ÎÅÉ> 2) I'd like to do RTT rendering not in every frame. But As I 
understand <ÎÅÉ> OSG create rendercashe to strore rendering order 
how can I dynamically <ÎÅÉ> attach and remove camera from rendering 
order?  <ÎÅÉ<ÎÅÉSwitching on and off could be done with Switch node 
or mask as Robert <ÎÅÉsaid. Not sure about switching order 
dynamically, but I'm still not sure <ÎÅÉyou need it.<ÎÅÉ<ÎÅÉ> <ÎÅÉ> 
See my example. If anyone is interested in my program I can 
share.<ÎÅÉ<ÎÅÉIf you could send me a simple version of your shader I 
can have a look.<ÎÅÉ<ÎÅÉjp<ÎÅÉ<ÎÅÉ> <ÎÅÉ> Thanx in advance<ÎÅÉ> 
<ÎÅÉ> Roman<ÎÅÉ> <ÎÅÉ> <ÎÅÉ> 
------------------------------------------------------------------------<ÎÅÉ> 
<ÎÅÉ> _______________________________________________<ÎÅÉ> osg-users 
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M(&]F('1H92!D969I;F5D(&5L;&EP<V]I9',-"FEF*&9296=I;VY-87-K17AT
M(#P](# N,# Q*2![#0IV4F5S=6QT+F<@/2 P+C [#0I]#0H-"@EG;%]&<F%G
70V]L;W(]=E)E<W5L=#L-"@T*?0T*#0H`
`
end

begin 666 cell_fp_2.glsl
M#0HO*D9204=-14Y47U-(041%4BHO#0IU;FEF;W)M('-A;7!L97(R1"!#96QL
M7W1E>#L-"@T*+R_PX.?LY?#[(/'[EMAIL PROTECTED]'[EMAIL PROTECTED];2!I;G0@
M9E-E9VUE;G17:61T:#L-"G5N:69O<FT@:6YT(&9396=M96YT2&5I9VAT.R -
M"@T*+R_PX.?LY?#[([EMAIL PROTECTED]/+[(.[AZ^#J[N(-"G5N:69O<FT@:6YT(&97:61T
M:#L-"G5N:69O<FT@:6YT(&9(96EG:'0[( T*#0HO+_'LY?GE[>C_(._N(.K@
M\/+E(.[AZ^#J[N(@Y.O_(.+[]^CQZ^7MZ/[EMAIL PROTECTED]>OHYN#I^.CU(/'N\>7DY>D@
M#0IU;FEF;W)M(&9L;V%T("!F3V9F<V5T6#$[#0IU;FEF;W)M(&9L;V%T("!F
M3V9F<V5T6#([#0IU;FEF;W)M(&9L;V%T("!F3V9F<V5T6C$[#0IU;FEF;W)M
M(&9L;V%T("!F3V9F<V5T6C([#0H-"@T*=F5C- [EMAIL PROTECTED]/=&AE<E-E9VUE
M;[EMAIL PROTECTED];G1);F1E>%]L;V-A;"[EMAIL PROTECTED],B!V3&]C86Q5
M5E]L;V-A;"D-"GL-"G9E8S(@=DQO8V%L5&5X.PT*=F5C,B!T96UP.PT*#0II
M9B H*&9!8W1396=M96YT26YD97A?;&]C86P\,"D@)[EMAIL PROTECTED]&9!8W1396=M96YT
M26YD97A?;&]C86P^,S$I*2 -"@E[#0H)<F5T=7)N(# N,#L-"@E]"0T*96QS
M90T*"7L-"@EV3&[EMAIL PROTECTED]>#UV3&]C86Q55E]L;V-A;"YX*VUO9"AF06-T
M4V5G;65N=$EN9&5X7VQO8V%L+#0N,"DJ9E-E9VUE;G17:61T:"]F5VED=&@[
M#0H)=DQO8V%L5&5X+GD]=DQO8V%L559?;&]C86PN>2MF;&]O<BAF06-T4V5G
M;65N=$EN9&5X7VQO8V%L+S0I*F9396=M96YT2&5I9VAT+V9(96EG:'0[#0H)
M#0H)<F5T=7)N('1E>'1U<F4R1"A#96QL7W1E>"[EMAIL PROTECTED]&5X+GAY*3L-
M"@E]#0I]#0H-"G9O:60@;6%I;BAV;VED*0T*>PT*=F5C-"!C;VQO<CL-"G9E
M8S(@=D%C=%-E9VUE;G0[#0IF;&]A="!F06-T4V5G;65N=$EN9&5X.PT*=F5C
M,B!V5&5M<#L-"G9E8S(@=E1E;7 R.PT*#0IV5&5M<"YX([EMAIL PROTECTED]&5X0V]O
M<F1;,%TN>" J(&97:61T:#L-"G9496UP+GD@/2!G;%]497A#;V]R9%LP72YY
M("[EMAIL PROTECTED]:6=H=#L-"G9496UP,BYX([EMAIL PROTECTED];7 N>" 
O(&9396=M96YT5VED
M=&@[#0IV5&5M<#(N>2 ]('[EMAIL PROTECTED];65N=$AE:6=H=#L-"@T*
M=D%C=%-E9VUE;G0N>" ](&9L;V]R*'9496UP,BYX*3L-"G9!8W1396=M96YT
M+GD@/2!F;&]O<BAV5&5M<#(N>2D[#0H-"FEF*"AV06-T4V5G;65N="YX("T@
M=E1E;7 [EMAIL PROTECTED](#X@,"XP*2!V06-T4V5G;65N="YX([EMAIL PROTECTED];G0N
M>"TQ+C [EMAIL PROTECTED];G0N>2 M('9496UP,BYY*2 ^(# N,"D@
M=D%C=%-E9VUE;G0N>2 ]('[EMAIL PROTECTED] Q+C [#0H-"F9!8W13
M96=M96YT26YD97@@/2!V06-T4V5G;65N="YX("[EMAIL PROTECTED]'9!8W1396=M96YT+GD@
M*B T+C I.PT*#0HO+V-O;7!U=&4@;&[EMAIL PROTECTED];V9F<V5T#0IV96,R('9,
M;V-A;%56.PT*#0IV3&]C86Q55BYX([EMAIL PROTECTED]&5X0V]O<F1;,%TN>" M("AV
M06-T4V5G;65N="YX("[EMAIL PROTECTED]'1H("[EMAIL PROTECTED];G17:61T:"D[#0IV3&]C
M86Q55BYY([EMAIL PROTECTED]&5X0V]O<F1;,%TN>2 M("AV06-T4V5G;65N="YY("\@
M9DAE:6=H=" J(&9396=M96YT2&5I9VAT*3L-"@T*8V]L;W(]('1E>'1U<F4R
M1"A#96QL7W1E>"[EMAIL PROTECTED]&5X0V]O<F1;,%TN>'DI.PT*+RIC;VQO<B K/2!T
M97AT=7)E,D0H0V5L;[EMAIL PROTECTED]('9E8S(H9VQ?5&5X0V]O<F1;,%TN>" K(&9/
M9F9S9718,[EMAIL PROTECTED]&5X0V]O<F1;,%TN>2DI.PT*8V]L;W(@[EMAIL 
PROTECTED]&5X='5R
M93)$*$-E;&Q?=&5X+"!V96,R*&=L7U1E>$-O;W)[EMAIL PROTECTED](&=L7U1E>$-O
M;W)[EMAIL PROTECTED]/9F9S971:,2DI.PT*8V]L;W(@[EMAIL PROTECTED]&5X='5R93)$*$-E
M;&Q?=&5X+"!V96,R*&=L7U1E>$-O;W)D6S!=+G@@+2!F3V9F<V5T6#$L9VQ?
M5&5X0V]O<F1;,%TN>2DI.PT*8V]L;W(@[EMAIL PROTECTED]&5X='5R93)$*$-E;&Q?=&5X
M+"!V96,R*&=L7U1E>$-O;W)[EMAIL PROTECTED]&5X0V]O<F1;,%TN>2UF3V9F
M<V5T6C$I*3L-"F-O;&]R("L]($-H96-K3W1H97)396=M96YT*&9!8W1396=M
M96YT26YD97@@+2 Q+C L('9,;V-A;%56*3L-"F-O;&]R("L]($-H96-K3W1H
M97)396=M96YT*&9!8W1396=M96YT26YD97@@*R Q+C L('9,;V-A;%56*3L-
M"F-O;&]R(#UC;VQO<B\W+C [#0HJ+PEG;%]&<F%G0V]L;W(]=F5C-"AC;VQO
@<BYG+&-O;&]R+F<L8V]L;W(N9RPQ+C I.PT*?0T*#0H`
`
end

begin 666 cell_fp_viewer.glsl
M#0HO*D9204=-14Y47U-(041%4BHO#0IU;FEF;W)M('-A;7!L97(R1"!#96QL
M7W1E>#L-"@T*#0IV;VED(&UA:6XH=F]I9"D-"GL-"@T*=F5C-"!C;VP@/2!T
M97AT=7)E,D0H0V5L;[EMAIL PROTECTED](&=L7U1E>$-O;W)D6S!=+GAY*3L-"@EG;%]&
4<F%G0V]L;W(]8V]L.PT*?0T*#0H`
`
end




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