Re: [osg-users] Creating Texture2DArray

[Sebastian Messerschmidt]

Hi Bruno,

Are all your textures/images of the same _format_ and _dimension_? (See
[1] - Overview) This is required for texture arrays. I haven't
experienced any problems with them in my code so far ..

Cheers
Sebastian


[1] https://www.opengl.org/registry/specs/EXT/texture_array.txt
> Hello,
>
> I'm trying to create a Texture2DArray. My textures are uchar images with
> size (texWidth, 256), single channel. The combination of texture
> internalFormat and pixelFormat with pixelType is not working. I use
> GL_R8UI for internalFormat, GL_RED_INTEGER for pixelFormat and
> GL_UNSIGNED_BYTE for type. This yields the following error when I try to
> render my scene:
>
> /Warning: detected OpenGL error 'invalid enumerant' at after
> RenderBin::draw(..)/
>
> However, if I use GL_LUMINANCE for internalFormat and also GL_LUMINANCE
> for pixelFormat, I get no errors but my textures are not correctly
> sized. WHat formats should I use here?
>
> This is my code:
>
>
>
> osg::ref_ptr<osg::Texture2DArray> texture = new osg::Texture2DArray;
> texture->setFilter(osg::Texture2DArray::MIN_FILTER,
> osg::Texture2DArray::LINEAR);
> texture->setFilter(osg::Texture2DArray::MAG_FILTER,
> osg::Texture2DArray::LINEAR);
> texture->setWrap(osg::Texture2DArray::WRAP_R, osg::Texture2DArray::REPEAT);
> texture->setInternalFormat(*textureFormat()*);
>
>
> // Add some images as follows:
> for (...) {
>
> osg::Image* image = new osg::Image;
> image->setImage(texWidth, 256, 1, *textureFormat(), pixelFormat(),
> type(),* dataPtr);
>
> texture->setImage(i, image);
> }
>
>
> I am using:
> textureFormat() = GL_R8UI;
> pixelFormat() = GL_RED_INTEGER;
> type() = GL_UNSIGNED_BYTE
>
>
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>
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[Sebastian Messerschmidt]

Hi Bruno:
Sorry for not reading to the end:

> Hello,
>
> I'm trying to create a Texture2DArray. My textures are uchar images with
> size (texWidth, 256), single channel. The combination of texture
> internalFormat and pixelFormat with pixelType is not working. I use
> GL_R8UI for internalFormat, GL_RED_INTEGER for pixelFormat and
> GL_UNSIGNED_BYTE for type. This yields the following error when I try to
> render my scene:
>
> /Warning: detected OpenGL error 'invalid enumerant' at after
> RenderBin::draw(..)/
>
> However, if I use GL_LUMINANCE for internalFormat and also GL_LUMINANCE
> for pixelFormat, I get no errors but my textures are not correctly
> sized. WHat formats should I use here?

When using GL_LUMINCANE as internal formet the pixlel format needs to be
GL_LUMINANCE4/8/12/16[F/I/UI] ...

So basically for default precision (GL_BYTE) it should be

GL_LUMINANCE8


Cheers
Sebastian

[Glenn Waldron]

Bruno, I think you have those reversed.

On Oct 21, 2016 6:07 AM, "Bruno Oliveira" <bruno.mana...@gmail.com> wrote:

Hello,

thank you for your answer. I am indeed using the same texture sizes and formats.

If I use GL_LUMINANCE8 as pixelFormat and GL_LUMINANCE as internalFormat, I get a "invalid enumerant" error

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[Glenn Waldron]

I mean that GL_LUMINANCE is a valid pixel format, and GL_LUMINANCE8 is an internal format. GL_LUMINANCE8 is not a valid pixel format and will probably give you a invalid enumerant error.

Glenn Waldron

On Fri, Oct 21, 2016 at 8:03 AM, Bruno Oliveira <bruno.mana...@gmail.com> wrote:

Sorry Glenn what do you mean by "those reserved"?

By the way, my intention is to pass uchar textures of fixed size, to perform texelFetch and bitwise operations inside a shader, so I really need my textures to be in the exact format of unsigned byte integer, single channel!

[Sebastian Messerschmidt]

Hi Bruno,




> How do I guarantee that my textures will be unsigned integer 8bit texels
> with no scaling nor normalization to float or whatsoever? Because using
> GL_LUMINANCE is distupring my textures

GL_LUMINANCE8UI should do the trick. You need use a the correct
sampler/data-type in the shader too (usampler and uvec)

Cheers
Sebatian

>
> 2016-10-21 13:47 GMT+01:00 Glenn Waldron <gwal...@gmail.com
> <mailto:gwal...@gmail.com>>:

>
> I mean that GL_LUMINANCE is a valid pixel format, and GL_LUMINANCE8
> is an internal format. GL_LUMINANCE8 is not a valid pixel format and
> will probably give you a invalid enumerant error.
>
>
>
> Glenn Waldron
>
> On Fri, Oct 21, 2016 at 8:03 AM, Bruno Oliveira
> <bruno.mana...@gmail.com

> <mailto:bruno.mana...@gmail.com>> wrote:
>
> Sorry Glenn what do you mean by "those reserved"?
>
>
> By the way, my intention is to pass uchar textures of fixed
> size, to perform texelFetch and bitwise operations inside a
> shader, so I really need my textures to be in the exact format
> of unsigned byte integer, single channel!
>
> 2016-10-21 12:25 GMT+01:00 Glenn Waldron <gwal...@gmail.com

> <mailto:gwal...@gmail.com>>:

>
> Bruno, I think you have those reversed.
>
>
> On Oct 21, 2016 6:07 AM, "Bruno Oliveira"

> <bruno.mana...@gmail.com

> <mailto:bruno.mana...@gmail.com>> wrote:
>
> Hello,
>
> thank you for your answer. I am indeed using the same
> texture sizes and formats.
> If I use GL_LUMINANCE8 as pixelFormat and GL_LUMINANCE
> as internalFormat, I get a "invalid enumerant" error
>
> 2016-10-21 7:56 GMT+01:00 Sebastian Messerschmidt

> <sebastian.m...@gmx.de
> <mailto:sebastian.m...@gmx.de>>:

> <mailto:osg-...@lists.openscenegraph.org>
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org

> <http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org>
>
> _______________________________________________
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> osg-...@lists.openscenegraph.org

> <mailto:osg-...@lists.openscenegraph.org>
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org

> <http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org>
>
>
>
> _______________________________________________
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> <mailto:osg-...@lists.openscenegraph.org>
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> <http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org>
>
>
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> <http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org>
>
>
>
> _______________________________________________
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>
>
>
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[Glenn Waldron]

Bruno,

According to this thread you might also need to set your packing to 1 (in the image->setImage call).

(https://goo.gl/1pv2Zt)

Just a guess.

Glenn Waldron

On Fri, Oct 21, 2016 at 9:36 AM, Bruno Oliveira <bruno.mana...@gmail.com> wrote:

Thanks for the answer.

Using GL_LUMINANCE8UI yields undefined symbol. The closest symbols I have defined is GL_LUMINANCE8UI_EXT.

However, using internal TExture Format as GL_LUMINANCE8UI_EXT and pixel format GL_LUMINANCE yields  'invalid operation' errors

2016-10-21 14:03 GMT+01:00 Sebastian Messerschmidt <sebastian.messerschmidt@gmx.de>:

Hi Bruno,

How do I guarantee that my textures will be unsigned integer 8bit texels
with no scaling nor normalization to float or whatsoever? Because using
GL_LUMINANCE is distupring my textures

GL_LUMINANCE8UI should do the trick. You need use a the correct sampler/data-type in the shader too (usampler and uvec)

Cheers
Sebatian

2016-10-21 13:47 GMT+01:00 Glenn Waldron <gwal...@gmail.com
<mailto:gwal...@gmail.com>>:

    I mean that GL_LUMINANCE is a valid pixel format, and GL_LUMINANCE8
    is an internal format. GL_LUMINANCE8 is not a valid pixel format and
    will probably give you a invalid enumerant error.



    Glenn Waldron

    On Fri, Oct 21, 2016 at 8:03 AM, Bruno Oliveira

    <bruno.manata.oliveira@gmail.com

    <mailto:bruno.manata.oliveira@gmail.com>> wrote:

        Sorry Glenn what do you mean by "those reserved"?


        By the way, my intention is to pass uchar textures of fixed
        size, to perform texelFetch and bitwise operations inside a
        shader, so I really need my textures to be in the exact format
        of unsigned byte integer, single channel!

        2016-10-21 12:25 GMT+01:00 Glenn Waldron <gwal...@gmail.com
        <mailto:gwal...@gmail.com>>:

            Bruno, I think you have those reversed.


            On Oct 21, 2016 6:07 AM, "Bruno Oliveira"

            <bruno.manata.oliveira@gmail.com

            <mailto:bruno.manata.oliveira@gmail.com>> wrote:

                Hello,

                thank you for your answer. I am indeed using the same
                texture sizes and formats.
                If I use GL_LUMINANCE8 as pixelFormat and GL_LUMINANCE
                as internalFormat, I get a "invalid enumerant" error

                2016-10-21 7:56 GMT+01:00 Sebastian Messerschmidt

                <sebastian.messerschmidt@gmx.de
                <mailto:sebastian.messerschmidt...@gmx.de>>:

[Trajce Nikolov NICK]

Hi Bruno,

I am using Texture2DArray heavelly and it is not buggy ... I am not a guru on this, but the issues I faced as what Sebastian mentioned, you have to have the images for the slots the same size and what I faced when working with it was it was working only if I fill the slots sequencially. Maybe if you post a code we can look at

On Fri, Oct 21, 2016 at 5:43 PM, Bruno Oliveira <bruno.mana...@gmail.com> wrote:

I'm starting to think that this is some OSG bug / inconsistency.

If I give up on Texture2DArray and upload a SINGLE Texture2D, if I use GL_R8UI as internalFormat and GL_RED_INTEGER as pixelFormat, everythning works perfectly.

2016-10-21 14:54 GMT+01:00 Bruno Oliveira <bruno.manata.oliveira@gmail.com>:

Thanks. However, I am already doing that!

2016-10-21 14:51 GMT+01:00 Glenn Waldron <gwal...@gmail.com>:

Bruno,

According to this thread you might also need to set your packing to 1 (in the image->setImage call).

(https://goo.gl/1pv2Zt)

Just a guess.

Glenn Waldron

--

trajce nikolov nick