If you have multisampling activated in your application, you will not be able to use the depth buffer directly. You will have to copy the depth buffer to a texture and then use that as input for your shader.
I don’t know that much about non-square textures or non power of two textures. You could certainly use a square texture and only fill part of it (a rectangular region) with the depth buffer’s contents but I don’t know if this is the best approach.
No I don’t have multisampling in my application…I have it turned on in my nvidia drivers, can this somehow interact ? I hope not.
OK, Iam using GL_TEXTURE_RECTANGLE_ARB only for blur pass in my engine, I think it can be changed to GL_TEXTURE_2D, but I don’t want to mess with that now. I will create a new fbo which will be using GL_TEXTURE and use it only for SSAO
So what I’ll do to pass depth buffer into my shader is following:
1.) Create a new FBO
2.) Create and associate a GL_TEXTURE_2D with it
3.) Create and associate a Depth texture with it
4.) Then I bind FBO, render scene, unbind FBO
5.) Bind/Load fragment program
6.) Bind depth texture onto a full screen quad
7.) Draw the full screen quad
8.) Read the depth buffer in fragment shader and compute SSAO
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