Hello Vincenzo,
Vincenzo Marafioti wrote:
> Hi all,
> I am trying to render on a FBOViewport using a shader. The texture
> attached to that FBO is a GL_TEXTURE_RECTANGLE_ARB and the image format
> is RGBA 32 F . What i need is to write a generic floating point value
> (not clamped from 0 to 1) in the RGBA channels. A snap of the code is
>
> beginEditCP(_img);
> _img->set(OSG::Image::OSG_RGBA_PF, _sizeX, _sizeY, 1, 1,
> 1, 0, NULL, OSG::Image::OSG_FLOAT32_IMAGEDATA);
>
> endEditCP(_img);
> beginEditCP(_texPtr);
> _texPtr->setImage(_img);
> _texPtr->setInternalFormat(GL_RGBA32F_ARB);
> _texPtr->setTarget(GL_TEXTURE_RECTANGLE_ARB);
> _texPtr->setMinFilter(GL_NEAREST);
> _texPtr->setMagFilter(GL_NEAREST);
>
> _texPtr->setWrapS( GL_CLAMP_TO_EDGE );
> _texPtr->setWrapT( GL_CLAMP_TO_EDGE );
add _texPtr->setScale(false), you don't want the texture to be scaled to
the next power of two.
[SNIP]
rest of the code looked ok to me.
> I am trying to find a method to understand if the shader has been
> corrected executed so, I would like to know if in your opinion:
> 1) is the previous code correct or i miss something regarding
> GL_TEXTURE_RECTANGLE_ARB setup?
should be ok, with the scale disabled it looks fairly similar to some
code I'm using with OpenSG 2 to set up a rectangular texture.
> 2) is there any method to easily view the content of the image attached
> to the fbo? I can't use "write" method because of its depth ("Invalid
> pixeldepth, cannot store data").
You need to choose an image format that can handle floating point
channels. I think from the supported formats only .hdr and .exr can
handle that, both seem to support writing in OpenSG (.exr only 16 bit
float).
Cheers,
Carsten
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