Opengl deep buffer to cuda

Question

I am the new Opengl programmer, my goal is to get the depth buffer in FBO so that I can transfer to kuda without using glReadpixels.

Here is what I have already done:

void make_Fbo()
{

    glGenFramebuffers(1, &fbo);
    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
    glFramebufferRenderbuffer(GL_FRAMEBUFFER,
                               GL_DEPTH_ATTACHMENT,
                           GL_RENDERBUFFER,
                                           fbo);
    check_gl_error("make_fbo");
}


void make_render_buffer()
{
    glGenRenderbuffers(1, &rb);
    glBindRenderbuffer(GL_RENDERBUFFER, rb);
    glRenderbufferStorage(GL_RENDERBUFFER,
                          GL_DEPTH_COMPONENT,
                               win.width,
                               win.height);
    check_gl_error("make render_buffer");
}

This code creates my FBO with the correct depth values.

A new problem has appeared, according to the article “Fast triangular rasterization using an irregular z-buffer on cuda”. Unable to connect to the depth buffer attached to Cuda's FBO.

Here is a quote from the article:

FBO . , , CUDA. [...] FBO. . GLSL [KBR06], gl_FragCoord

? ? ?

Answer 1

. , CUDA, FBO.

, cudaGraphicsGLRegisterImage() cuda . , , rendertarget FBO, .

API cuda:

https://docs.nvidia.com/cuda/cuda-runtime-api/group__CUDART__OPENGL.html#group__CUDART__OPENGL_1g80d12187ae7590807c7676697d9fe03d

, CUDA ( ).

http://codekea.com/xLj7d1ya5gD6/modifying-opengl-fbo-texture-attachment-in-cuda.html