通过PBO进行opengl与Cuda的纹理互操作

OpenGL Interop Steps

Register a buffer object with CUDA
　　cudaGLRegisterBufferObject(GLuint buffObj);
　　OpenGL can use a registered buffer only as a source
　　Unregister the buffer prior to rendering to it by OpenGL

Map the buffer object to CUDA memory
　　cudaGLMapBufferObject(void **devPtr, GLuint buffObj);
　　Returns an address in global memory
　　Buffer must registered prior to mapping

Launch a CUDA kernel to process the buffer

Unmap the buffer object prior to use by OpenGL
　　cudaGLUnmapBufferObject(GLuint buffObj);

Unregister the buffer object
　　cudaGLUnregisterBufferObject(GLuint buffObj);
　　Optional: needed if the buffer is a render target

Use the buffer object in OpenGL code