[osg-users] Creating Texture2DArray
Bruno Oliveira
bruno.manata.oliveira at gmail.com
Fri Oct 21 08:43:15 PDT 2016
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 at gmail.com>:
> Thanks. However, I am already doing that!
>
> 2016-10-21 14:51 GMT+01:00 Glenn Waldron <gwaldron at 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
>>
>> On Fri, Oct 21, 2016 at 9:36 AM, Bruno Oliveira <
>> bruno.manata.oliveira at 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 at 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 <gwaldron at gmail.com
>>>>> <mailto:gwaldron at 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 at gmail.com
>>>>> <mailto:bruno.manata.oliveira at 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 <gwaldron at gmail.com
>>>>> <mailto:gwaldron at gmail.com>>:
>>>>>
>>>>> Bruno, I think you have those reversed.
>>>>>
>>>>>
>>>>> On Oct 21, 2016 6:07 AM, "Bruno Oliveira"
>>>>> <bruno.manata.oliveira at gmail.com
>>>>> <mailto:bruno.manata.oliveira at 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 at gmx.de
>>>>> <mailto:sebastian.messerschmidt at gmx.de>>:
>>>>>
>>>>>
>>>>>
>>>>> 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
>>>>>
>>>>>
>>>>> This is my code:
>>>>>
>>>>>
>>>>>
>>>>> osg::ref_ptr<osg::Texture2DArray> texture =
>>>>> new
>>>>> osg::Texture2DArray;
>>>>> texture->setFilter(osg::Textur
>>>>> e2DArray::MIN_FILTER,
>>>>> osg::Texture2DArray::LINEAR);
>>>>> texture->setFilter(osg::Textur
>>>>> e2DArray::MAG_FILTER,
>>>>> osg::Texture2DArray::LINEAR);
>>>>> texture->setWrap(osg::Texture2DArray::WRAP_R,
>>>>> osg::Texture2DArray::REPEAT);
>>>>> texture->setInternalFormat(*t
>>>>> extureFormat()*);
>>>>>
>>>>>
>>>>> // 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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