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jPCT-AE - a 3d engine for Android => Support => Topic started by: MoonHelp on February 11, 2012, 09:08:54 pm

Title: Shader's Hell !
Post by: MoonHelp on February 11, 2012, 09:08:54 pm

Shader's Hell...

Hi, Everybody !! (Hello Egon) [I read your forum everyday]

My test : The HelloShader Eclipse data

I'am playing with JPCT-AE and I tried some test.

I keep the GLSLShader Method on my cube.

I removed all shaders files into the jar
and I expected an Eclipse bug : but nothing wrong...
My scene is the same. (nothing change).

Could you tell me why ?

Friendly

Olivier (France)
Graphic Designer (print publishing) ==>15 years skill BUT JAVA noob
Bad english inside ? sorry !! : -) I'am French  and I don't speak every days your language !
Rights ?

Title: Re: Shader's Hell !
Post by: EgonOlsen on February 11, 2012, 09:33:55 pm

I don't get the problem...you've removed the shader files and expected the result to be wrong but it wasn't? Or was is wrong before and nothing changed after removing the files?

Title: Re: Shader's Hell !
Post by: MoonHelp on February 13, 2012, 11:21:26 am

Hi,Egon !

I mean :
My scene was ok at the begining !
A spinning cube with a grey jpeg bitmap texture

My test :
I deleted all the code in these 2 files (now I have 2 empty files)  :

res/raw/fragmentshader_offset.glsl
res/raw/vertexshader_offset.glsl


and I unpacked the jar > deleted  all the 16 shaders file .src
I repacked the jar

I updated the eclipse project with this new jar without .src files
and lauched again...

My scene is identical : my 3D object seems a bit more opaque...

My question : now what is the process who's support the non existing GLSLshaders informations
and return a default value ?

Merci
Olivier

Title: Re: Shader's Hell !
Post by: EgonOlsen on February 13, 2012, 12:02:42 pm

The shader files are only needed for OpenGL ES2.0. Are you sure that you are using this?

Title: Re: Shader's Hell !
Post by: MoonHelp on February 13, 2012, 02:02:41 pm

OK

I loaded a new instance of the HelloShader eclipse project
and deleted all code in the 2 shaders files (res/raw) and copy/paste
code from the Shaders Generator Devel apk (Android Market)

And now I have a beautiful  ERROR: Missing attribute 'position' in vertex shader
OK OPENGL ES2.0 is now enable !

BTW : why shaders devel generate wrong code ? (I imported the same 3D object (a simply cube) in shader devel)

Thank you

Title: Re: Shader's Hell !
Post by: EgonOlsen on February 13, 2012, 09:28:48 pm

It doesn't generate wrong code  (i assume...)...it's just that you have to follow some naming conventions in your shaders for uniforms and attributes to allow jPCT-AE to inject its data into your shader. Those are documented in the GLSLShader class: http://www.jpct.net/jpct-ae/doc/com/threed/jpct/GLSLShader.html (http://www.jpct.net/jpct-ae/doc/com/threed/jpct/GLSLShader.html)

Title: Re: Shader's Hell !
Post by: MoonHelp on February 14, 2012, 02:13:38 pm

Ok
I will try.

Merci