Low precision and clamping when writing to floating point FBO

Question

I have an FBO which has been created in the following way:

glGenRenderbuffers(1, &m_depthStencilBuffer);
glBindRenderbuffer(GL_RENDERBUFFER, m_depthStenc         


        

Answer 1

The problem was a stupid bug on my part, in my FBO resize code I called:

glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, ...);

instead of

glTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA32F_ARB, ...);

Answer 2

Yes, it will be clamped to the range (0, 1) - check out glClampColor and disable color clamping.

Hope this helps!