[osg-users] Creating Texture2DArray

[Bruno Oliveira]

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

2016-10-21 13:47 GMT+01:00 Glenn Waldron <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> 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>:
>>
>>> Bruno, I think you have those reversed.
>>>
>>> On Oct 21, 2016 6:07 AM, "Bruno Oliveira" <bruno.manata.oliveira at gmail.c
>>> om> 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>:
>>>>
>>>>>
>>>>> 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::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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