eglimage cuda

eglimage_cuda.cpp

// Create a texture and register it for sharing with CUDA.
int setup_external_texture_oes(nengl_ws* ws, void* window)
{
    int isSupported = -1;
    isSupported = ws->check_extension("EGL_KHR_gl_texture_2D_image");
    isSupported = ws->check_extension("GL_OES_EGL_image_external");
    
    constexpr GLsizei texSize = 32;
    GLubyte data[texSize * texSize * 4];
    GLuint mSourceTexture, mExternalTexture;

    glGenTextures(1, &mSourceTexture);
    glBindTexture(GL_TEXTURE_2D, mSourceTexture);
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texSize, texSize, 0, GL_RGBA, GL_UNSIGNED_BYTE,
        data);

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
    
    glGenTextures(1, &mExternalTexture);

    PFNEGLCREATEIMAGEKHRPROC pfnEglCreateImageKHR = 
        (PFNEGLCREATEIMAGEKHRPROC)glfwGetProcAddress("eglCreateImageKHR");
    PFNGLEGLIMAGETARGETTEXTURE2DOESPROC pfnGlEglImageTargetTexture2dOes = 
        (PFNGLEGLIMAGETARGETTEXTURE2DOESPROC)glfwGetProcAddress("glEGLImageTargetTexture2DOES");

    if (!pfnEglCreateImageKHR)
    {
        return -1;
    }
    if (!pfnGlEglImageTargetTexture2dOes)
    {
        return -1;
    }

    EGLint attribs[] = {
        EGL_IMAGE_PRESERVED,
        EGL_TRUE,
        EGL_NONE,
    };

    EGLImageKHR image =
        pfnEglCreateImageKHR(ws->get_egl_display(), ws->get_egl_context(window), EGL_GL_TEXTURE_2D_KHR,
            reinterpret_cast<EGLClientBuffer>(mSourceTexture), attribs);

    GL_CHECK(pfnEglCreateImageKHR);

    glBindTexture(GL_TEXTURE_EXTERNAL_OES, mExternalTexture);
    pfnGlEglImageTargetTexture2dOes(GL_TEXTURE_EXTERNAL_OES, image);

    GL_CHECK(pfnGlEglImageTargetTexture2dOes);

    glTexParameteri(GL_TEXTURE_EXTERNAL_OES, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
    glTexParameteri(GL_TEXTURE_EXTERNAL_OES, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

    // Register buffer with CUDA 
    struct cudaGraphicsResource* pResource = NULL;
    cudaError_t err = cudaSuccess;
    err = cudaGraphicsEGLRegisterImage(&pResource, image, CU_GRAPHICS_REGISTER_FLAGS_NONE);

    return 0;
}