Hi,
for my current project I need to do some computations in the fragment shader
and retrieve the values within my application. For that I am using the render
to texture feature together with a float texture.
I'm having some trouble reading values > 1.0 though. It seems like the values
are getting clamped to 0..1, even though I followed the osgprerender HDR setup.
Besides the code below, I have also tried GL_RGBA32F (ARB and not ARB) for the
internal texture format, tried double for the image and source type and tried
using osg::ClampColor to disable clamping for the RTT camera, all without
success.
When reading the texture, It returns (0.123,0.5,1,1) for every texel.
Code for texture setup:
Code:
radarTexture = new osg::Texture2D;
radarTexture->setInternalFormat(GL_RGBA16F_ARB);
radarTexture->setSourceFormat(GL_RGBA);
radarTexture->setSourceType(GL_FLOAT);
auto textureImage = osgHelper::make_osgref<osg::Image>();
textureImage->allocateImage(16,16,1,GL_RGBA, GL_FLOAT);
// textureImage->setImage(128, 128, 1, GL_RGBA, GL_RGBA, GL_UNSIGNED_BYTE,
// nullptr, osg::Image::AllocationMode::NO_DELETE);
radarTexture->setImage(textureImage);
radarTexture->setMaxAnisotropy(0);
radarTexture->setWrap(osg::Texture::WRAP_S,
osg::Texture::CLAMP_TO_EDGE);
radarTexture->setWrap(osg::Texture::WRAP_T,
osg::Texture::CLAMP_TO_EDGE);
radarTexture->setFilter(osg::Texture::FilterParameter::MIN_FILTER,
osg::Texture::FilterMode::NEAREST);
radarTexture->setFilter(osg::Texture::FilterParameter::MAG_FILTER,
osg::Texture::FilterMode::NEAREST);
radarTexture->setDataVariance(osg::Object::DYNAMIC);
RTT Camera setup (some)
Code:
// set the camera to render before the main camera.
this->setRenderOrder(osg::Camera::PRE_RENDER);
// tell the camera to use OpenGL frame buffer object where supported.
this->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
// attach the texture and use it as the color buffer.
this->attach(osg::Camera::COLOR_BUFFER0, dest->getImage());
GLSL Fragment Shader Code (simplified):
Code:
void main()
{
gl_FragColor = vec4(0.123,0.5,3,4);
}
Thank you!
Cheers,
Philipp
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=67593#67593
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