Depth array textures not working with FBO

OpenGL OpenGL: Basic Coding
1

I am using layered depth textures with FBO. Here is my code for setup:



glBindTexture(GL_TEXTURE_2D_ARRAY, depth_texture_->id());    
glPixelStorei(GL_UNPACK_ALIGNMENT, 1); 
glTexImage3D(GL_TEXTURE_2D_ARRAY,0,GL_DEPTH_COMPONENT16, width,height,depth,0,GL_DEPTH_COMPONENT, GL_UNSIGNED_SHORT,NULL);
glTexParameteri(GL_TEXTURE_2D_ARRAY,GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D_ARRAY,GL_TEXTURE_WRAP_S, GL_REPEAT);
 glTexParameteri(GL_TEXTURE_2D_ARRAY,GL_TEXTURE_WRAP_T, GL_REPEAT);
glBindTexture(GL_TEXTURE_2D_ARRAY, 0);


glGenFramebuffers(1, &fboId_);    
glBindFramebuffer(GL_FRAMEBUFFER, fboId_);
glFramebufferTextureLayer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
        depth_texture_->id(), 0, shadowMapIndex_);

////////// Check FrameBuffer was created with success ///
int fboStatus = glCheckFramebufferStatus(GL_FRAMEBUFFER);
if (fboStatus != GL_FRAMEBUFFER_COMPLETE) {
    LOGE("Could not create FBO: %d", fboStatus);
    switch(fboStatus){
    case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT :
        LOGE("GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT");
        break;
    case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT:
        LOGE("GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT");
        break;

    case GL_FRAMEBUFFER_UNSUPPORTED:
        LOGE("GL_FRAMEBUFFER_UNSUPPORTED");
        break;
    }
    throw std::exception(); // "Could not create FBO: " + fboStatus
}
In render:

GL(glBindFramebuffer(GL_FRAMEBUFFER, framebufferId));
GL(glViewport(rstate.viewportX, rstate.viewportY, rstate.viewportWidth, rstate.viewportHeight));
GL(glClear(GL_DEPTH_BUFFER_BIT ));


        glActiveTexture(GL_TEXTURE0);
        glBindTexture(GL_TEXTURE_2D_ARRAY, depth_texture_->id());
        glPixelStorei(GL_PACK_ALIGNMENT, 1);

All my depth data is black here. If I switch to GL_TEXTURE_2D, it works fine. For the layered one, if I use color attachment, I get data but only depth attachment is black. what could be wrong here?

2

I think you miss one piece of your rendering system: you already have a texture array you want
to fill with depth data (depth_texture_->id()), and you have a framebuffer (fboId), but where
is your renderbuffer? I mean you need something like this:


glGenRenderbuffers(1, &renderBuffer);
glBindRenderbuffer(GL_RENDERBUFFER, renderBuffer);
glRenderbufferStorege(GL_RENDERBUFFER, GL_DEPTH_COMPONENT16, width, height);
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, renderBuffer);
3

[QUOTE=mamannon;1282253]I think you miss one piece of your rendering system: you already have a texture array you want to fill with depth data (depth_texture_->id()), and you have a framebuffer (fboId), but where
is your renderbuffer?
[/QUOTE]
He’s using a texture layer as the depth attachment, he doesn’t need a renderbuffer.

4

Sorry, I missed it… I have to give up, no ideas…

5

You haven’t explained how you get “black”. Via glReadPixels? Or via a sampler? When you change from 2D to 2D_ARRAY, you’ll also need to change all your samplers.

6

I am changing my sampler to sampler2DArray. I am getting it black via sampler when I read in shader. Interestingly, when I try to read data from color attachment of 2DArray which is bound to same FBO, I have all the data in place. Right now as a workaround, I am storing my depth data in color attachment.