[osg-users] how to render 16bit depth image

[Sebastian Messerschmidt]

Hi Bruno,
> I intend to render a 16 bit per channel, 4 channel image, i.e., each 
> pixel is 4 x unsigned 16bit (uint16_t) RGBA, leading to 64bit per pixel.
This clarified you probably need:
internal: GL_RGBA16UI
format: GL_RGBA
type: GL_UNSIGNED_SHORT


https://www.opengl.org/sdk/docs/man/docbook4/xhtml/glTexImage2D.xml

Hope that helps
Cheers
Sebastian
>
> 2016-07-20 8:48 GMT+01:00 Sebastian Messerschmidt 
> <sebastian.messerschmidt at gmx.de <mailto:sebastian.messerschmidt at gmx.de>>:
>
>     Hi Bruno,
>>     Ok so I meant GL_ vars. Could you suggest any code for
>>     substituting that setImage line? Thank you
>
>     To what end? You haven't told us, what you want to achieve, except
>     from using integer.
>     If you want to fill it with 16bit integer values you probably need
>
>
>     internal: GL_R16UI
>     format: GL_RED_INTEGER
>     type: GL_UNSIGNED_SHORT
>
>     will give you a format, where the red channel is 16bit with
>     unsigned values and your source type is unsigned short values.
>
>     Cheers
>     Sebastian
>
>>
>>     On 19 Jul 2016, at 09:35, Sebastian Messerschmidt
>>     <sebastian.messerschmidt at gmx.de
>>     <mailto:sebastian.messerschmidt at gmx.de>> wrote:
>>
>>>     Hi Bruno,
>>>>     Sorry but I didn't quite catch that.
>>>>     What do you mean by "but I thing you need to use
>>>>     GL_RGBA_INTEGER_EXT as source"
>>>     The source type needs to be GL_RGBA_INTEGER_EXT afaik when using
>>>     integer textures.
>>>>     Alternatively, how can I replace the macros in that setImage
>>>>     function call?
>>>     Which macros? The GL_ are constants.
>>>
>>>     Cheers
>>>     Sebastian
>>>>
>>>>     2016-07-19 8:45 GMT+01:00 Sebastian Messerschmidt
>>>>     <sebastian.messerschmidt at gmx.de
>>>>     <mailto:sebastian.messerschmidt at gmx.de>>:
>>>>
>>>>         Hi,
>>>>
>>>>         Your internal format needs to be 16bit per channel to I
>>>>         think, so GL_UNSIGNED_INT_8_8_8_8_REV might be inappropriate.
>>>>         GL_R16UI might do, but I thing you need to use
>>>>         GL_RGBA_INTEGER_EXT as source. Alternatively you can use
>>>>         GL_LUMINANCE with GL_LUMINACE16F.
>>>>
>>>>         What exactly are you doing with the image?
>>>>
>>>>         Cheers
>>>>         Sebastian
>>>>>         Hello,
>>>>>
>>>>>         I have a 16bit per channel, 4 channel, image. The format
>>>>>         is short (uint16_t). Note that this image is scaled to the
>>>>>         full 16bit depth [0, 65536]
>>>>>
>>>>>
>>>>>         I have this code that works well for a 8bit, 4 channel image:
>>>>>
>>>>>         osg::ref_ptr<osg::Image> image = new osg::Image();
>>>>>          image->setImage(ImageSize, ImageSize,1,
>>>>>         GL_RGBA8,
>>>>>         GL_RGBA,
>>>>>         GL_UNSIGNED_INT_8_8_8_8_REV,
>>>>>         MyDataPtr,
>>>>>         osg::Image::NO_DELETE);
>>>>>
>>>>>
>>>>>
>>>>>         Now I want to por this to 16bit depth.
>>>>>         How is this done?
>>>>>
>>>>>         I tried
>>>>>
>>>>>          image->setImage(ImageSize, ImageSize,1,
>>>>>         GL_RGBA16UI,
>>>>>         GL_RGBA,
>>>>>         GL_UNSIGNED_INT_8_8_8_8_REV,
>>>>>         MyDataPtr,
>>>>>         osg::Image::NO_DELETE);
>>>>>
>>>>>         But this yields all black textures. How can I do this
>>>>>         without converting my 16bit image pixel data?
>>>>>
>>>>>
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>>>>
>>>>
>>>>
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