Stefano schrieb:
> nope.. i was wrong.. now i can succesfully take the rendering.. but as
> TextureGrabBackground (and Foreground also) use glCopyTexSubImage2D to
> copy the rendering, they will clamp the values between [0,1].. so all
> i am getting is a LDR render in a float16 image
>
> "The pixels in the rectangle are processed exactly as if
> glCopyPixels had been called, but the process stops just
> before final conversion. At this point, all pixel component
> values are clamped to the range [0, 1] and then converted to
> the texture's internal format for storage in the texel
> array."
>
> any suggestions?
>
Hi,
you can alternatively use the FBPViewport instead, which also supports
rendering into floating-point-textures (if the internalFormat is set
appropriately).
Bye
Yvonne
> 2007/4/20, Stefano <[EMAIL PROTECTED]>:
>
>> the problem was solved adding setBindTarget(GL_TEXTURE_RECTANGLE_NV) to the
>> texture.. thanks
>>
>>
>> 2007/4/19, Marcus Lindblom <[EMAIL PROTECTED]>:
>>
>>
>>> I think you want a PolygonBackground instead. That has worked for me
>>> previously.
>>>
>>> Try with a SimpleTexturedMaterial and make sure that part of the
>>> rendering works before doing anything else.
>>>
>>> Also, I'm not sure about TextureGrabForeground and resizing. It might
>>> resize the image automatically, but if not, try setting it to a larger
>>> size than 1,1.
>>>
>>> Cheers,
>>> /Marcus, who's now leaving on vacation in California for two weeks. See
>>> all you guys in while! :-)
>>>
>>> Stefano wrote:
>>>
>>>> Hi there!
>>>> What I want to do is to:
>>>> - render some HDR scene into a viewport (not tone mapped yet!)
>>>> - grab the rendering with a TextureGrabForeground
>>>> - redraw the rendering using a PolygonForeground with a ShaderMaterial
>>>> to do
>>>> some blooming and then tone mapping
>>>>
>>>> is this possible with opensg? i think so..
>>>>
>>>> this is my simple osg setup code:
>>>>
>>>> ImagePtr img = Image::create();
>>>>
>>> > addRefCP(img);
>>>
>>>> beginEditCP(img);
>>>> img->set(Image::OSG_RGB_PF, 1, 1, 1, 1, 1, 0, NULL,
>>>> Image::OSG_FLOAT16_IMAGEDATA);
>>>> endEditCP(img);
>>>>
>>>> TextureChunkPtr tex = TextureChunk::create();
>>>> addRefCP(tex);
>>>> beginEditCP(tex);
>>>> tex->setImage(img);
>>>> tex->setTarget(GL_TEXTURE_RECTANGLE_NV);
>>>> tex->setInternalFormat(GL_FLOAT_RGB16_NV);
>>>> tex->setWrapS( GL_CLAMP_TO_EDGE );
>>>> tex->setWrapT( GL_CLAMP_TO_EDGE);
>>>> tex->setMinFilter( GL_NEAREST );
>>>> tex->setMagFilter( GL_NEAREST );
>>>> tex->setScale(false);
>>>> endEditCP(tex);
>>>>
>>>> TextureGrabForegroundPtr tg = TextureGrabForeground::create();
>>>> beginEditCP(tg);
>>>> tg->setTexture(tex);
>>>> endEditCP(tg);
>>>>
>>>> SHLChunkPtr _vGloomShader = SHLChunk::create();
>>>> beginEditCP(_vGloomShader);
>>>> _vGloomShader->setVertexProgram(Utils::getFile("gloom.vert"));
>>>> _vGloomShader->setFragmentProgram(Utils::getFile("gloom.frag"));
>>>> _vGloomShader->setUniformParameter("image", 0);
>>>> endEditCP(_vGloomShader);
>>>>
>>>> ChunkMaterialPtr _vGloomMaterial = ChunkMaterial::create();
>>>> beginEditCP(_vGloomMaterial);
>>>> _vGloomMaterial->addChunk(tex);
>>>> _vGloomMaterial->addChunk(_vGloomShader);
>>>> endEditCP(_vGloomMaterial);
>>>>
>>>> PolygonForegroundPtr polyFrgnd =
>>>> Utils::makeDefaultPolygonForeground();
>>>> beginEditCP(polyFrgnd);
>>>> polyFrgnd->setMaterial(_vBlurMaterial);
>>>> endEditCP(polyFrgnd);
>>>>
>>>> ====
>>>>
>>>> even with a basic shader without any effects like this below all i'm
>>>> getting
>>>> is a black viewport..
>>>>
>>>> ((gloom.vert))
>>>>
>>>> void main(void) {
>>>> gl_Position=ftransform();
>>>> gl_TexCoord[0] = gl_MultiTexCoord0;
>>>> }
>>>>
>>>> (( gloom.frag))
>>>>
>>>> uniform samplerRECT image;
>>>> // hardcoded viewport size.. :P
>>>> const int imageTextureWidth = 620;
>>>> const int imageTextureHeight = 386;
>>>> const float toneMap = 0.332;
>>>>
>>> > const float gamma = 2.2;
>>>
>>>> const float invGamma = 1/gamma;
>>>>
>>>> half3 toneMapping(half3 hdrColor) {
>>>> hdrColor = pow(hdrColor, 0.4545);
>>>> return clamp((hdrColor * toneMap) , 0.0, 1.0 );
>>>> }
>>>>
>>>> void main(void) {
>>>> vec2 pixelCoord;
>>>> pixelCoord[0] = gl_TexCoord[0].x * float(imageTextureWidth);
>>>> pixelCoord[1] = gl_TexCoord[0].y * float(imageTextureHeight);
>>>>
>>> >
>>>
>>>> ivec2 intCoord = floor(pixelCoord);
>>>> half3 color = half3(texture2DRect(image, intCoord));
>>>>
>>>> gl_FragColor = half4(toneMapping(color), 1.0);
>>>> }
>>>>
>>>> ===
>>>>
>>>>
>>> > any ideas? am i setting up some wrong parameters to the texture?
>>>
>>>> thanks in advance
>>>>
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>>>
>>
>> --
>> Stefano Verna
>> mail/gtalk: [EMAIL PROTECTED]
>> skype: steffoz
>>
>
>
>
>
--
Yvonne Jung
Fraunhofer-IGD | Tel.: ++49-6151-155-290
Fraunhoferstr. 5 | Fax.: ++49-6151-155-196
64283 Darmstadt | email: [EMAIL PROTECTED]
Germany | http://www.igd.fhg.de/igd-a4
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