Hi all.
i wrote some code that shares the color buffer between opengl and opencl and is able to read and write (from opencl) to this buffer(s). the code works well on linux.
i need now to access the depth buffer too.

the steps i'm following:
Code :
//init gl subsystem
...
glEnable(GL_DEPTH_TEST);
glEnable( GL_FRAMEBUFFER_EXT );
 
//glDeleteFramebuffersEXT(1, fboId);
glGenFramebuffersEXT(1, &fboId);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fboId);
 
//color buffer
glGenRenderbuffersEXT(1, &PS1_buffer_id);
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, PS1_buffer_id);
glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_RGBA, width, height);
 
//depth buffer
glGenRenderbuffersEXT(1, &PS1_depth_buffer_id);
glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, PS1_depth_buffer_id);
glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT, width, height);
 
// attach a texture to FBO color attachement point
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_RENDERBUFFER_EXT, PS1_buffer_id);
glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, PS1_depth_buffer_id);
 
//framebuffer status is OK
 
//init openCL
cl_context_properties props[] = {
	CL_GL_CONTEXT_KHR, (cl_context_properties)glXGetCurrentContext(),
	CL_GLX_DISPLAY_KHR,  (cl_context_properties)glXGetCurrentDisplay(),
	CL_CONTEXT_PLATFORM, (cl_context_properties)cpPlatform,
	0};
 
cl_context ctx = clCreateContextFromType(props, CL_DEVICE_TYPE_GPU, NULL, NULL, &ciErrNum);
context = cl::Context(ctx);
 
cl::vector<cl::Device> devices = context.getInfo<CL_CONTEXT_DEVICES>();
cl::Device device = devices[0];
 
std::string sources = ReadClFromFile("kernel_depth.cl");
 
cl::Program::Sources source(1, std::make_pair(sources.c_str(),sources.length()));
cl::Program program = cl::Program(context, source);
program.build(devices);
 
cl::CommandQueue queue = cl::CommandQueue(context, device, 0, &ciErrNum);
 
m_buffer = clCreateFromGLRenderbuffer(context(), CL_MEM_READ_ONLY, m_buffer_id, &ciErrNum);
m_depth_buffer = clCreateFromGLRenderbuffer(context(), CL_MEM_READ_ONLY, PS1_depth_buffer_id, &ciErrNum);

the first call to clCreateFromGLRenderbuffer works perfectly, while the second one fails with a CL_INVALID_VALUE
documentation says:
CL_INVALID_VALUE if values specified in flags are not valid.
any hint?

if you have any questions please ask.