Why cudaGLSetGLDevice failed, even though it's called in the first line of main function

Question

I want to use interoperability between OpenGL and CUDA. I know, as some tutorials said, the first step is to choose device. However, when I called the cudaGLSetGLDevice(0) in th

Answer 1

You need in opengl context initialized before call cudaGLSetDevice. In case of glut glutInit(argc, argv); is called. Initialize opengl context before use any cuda<->opengl interoperability functions call.