Hi everyone,
I would like to use osg PPU to compute very accurate data, about ten
number behind the comma, to avoid numerical errors.
So I used 32 bits textures for the render to texture :
texture2D->setInternalFormat(GL_RGBA32F_ARB);
texture2D->setSourceFormat(GL_RGBA);
texture2D->setSourceType(GL_FLOAT);
texture2D->setWrap(osg::Texture2D::WRAP_S,osg::Texture2D::CLAMP_TO_BORDER);
texture2D->setWrap(osg::Texture2D::WRAP_T,osg::Texture2D::CLAMP_TO_BORDER);
texture2D->setWrap(osg::Texture2D::WRAP_R,osg::Texture2D::CLAMP_TO_BORDER);
texture2D->setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::NEAREST);
texture2D->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::NEAREST);
But I noticed, by exemple, when I put the value 0.012024048 in one
shader (gl_FragColor = vec(0.012024048, 0.012024048, 0.012024048,
1.0);),
the value read in the next shader becomes 0.012023926.
I checked the values twice, once with the glsl Devil debugger, once
with an UnitOutCapture.
Is there a way to have more precision for my data ?
Thanks in advance,
Josselin.
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