Which gl version are you targeting? on what hardware?

Detach it from the framebuffer via glFramebufferTexture2D().


L. Spiro

What? How? I didn't use it! I guess you must be right, now I'm gonna try...

for (int i = 0 ; i < 6 ; i++) {
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_CUBE_MAP_POSITIVE_X+i, 0, 0);
}

my code is pretty big and it worked in old gl mode.

Then I ported code to GL 3,0 and I'm getting this error every glDrawElements call within the light pass. The scene is partially shadow correctly, and partially occluded in black. The depth values in cubemap are correct (I've tested them with glDebugger).

Here is my cubemap stuff:

		
	void CreateShadowMapCubeDepthFBO()
	{
		// Create the FBO
		glGenFramebuffers(1, &m_fbo);

		// Create the depth buffer
		glGenTextures(1, &m_depth);
		glBindTexture(GL_TEXTURE_CUBE_MAP, m_depth);
	    
		for (int i = 0 ; i < 6 ; i++)
		{
			glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_DEPTH_COMPONENT32, size, size, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
			glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
			glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
			glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
			glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
			glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
		}
		glBindTexture(GL_TEXTURE_CUBE_MAP, 0);

		glBindFramebuffer(GL_FRAMEBUFFER, m_fbo);
		for (int i = 0 ; i < 6 ; i++)
		{
			glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_CUBE_MAP_POSITIVE_X+i, m_depth, 0);
		}

		GLenum Status = glCheckFramebufferStatus(GL_FRAMEBUFFER);

		if (Status != GL_FRAMEBUFFER_COMPLETE) 
		{
			// print stuff
		}
		glBindFramebuffer(GL_FRAMEBUFFER, 0);
	}


	void BindFBOCubeMapFace(int index)
	{
		glBindFramebuffer(GL_FRAMEBUFFER, m_fbo);
		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_CUBE_MAP_POSITIVE_X+index, m_depth, 0);
	}
	 void StopUsingFBO()
	 {
		for (u32 i = 0 ; i < 6 ; i++) 
		{
			glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_CUBE_MAP_POSITIVE_X+i, 0, 0);
		}
		glBindFramebuffer(GL_FRAMEBUFFER, 0);
	}

you are attaching the cubemap faces to GL_DEPTH_ATTACHMENT, not the GL_COLOR_ATTACHMENTx

It is rather rare to have gpu the support for sampling depth attachment storage of a frame object. You must query the "depth texture" extension availability if you will ever want to.

But I would encourage you to not do so, but instead, attach cube faces to COLORx storage and encode your depth values to those. Then, by a simple

glBindFramebuffer(GL_FRAMEBUFFER, 0);

all your color storage textrues of unbound frame will be available for setting as a sampling slot.

You can use MRT (multiple render targets) so you will save up processing of your cube generation and store the z values along with the rendering of yours that performs z values in depth buffer you wish to sample.

Thank you for pointing this stuff, but my shadows still aren't working.

I think I cleared error flag before glDrawElements, I am calling glGetError very often.

Anyway, here is the entire log of my OpenGL calls, starting from unbinding the FBO (after I have drawn six views to it), and ending with gl error.

Please take a look:

EDIT: just note that my old code with the same shadow map cubemap code but for old openGL (without compatilibity mode) is working on the same PC...