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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