Sharing texture between OpenGL and CUDA -


i sharing data between opengl , cuda follows:

gluint buffer; glgenbuffers(1, &buffer); // image bound texture buffer @ point. ... cudagraphicsresource_t cgr; checkcudaerrors(cudagraphicsglregisterbuffer(&cgr,                  buffer, cudagraphicsregisterflagsnone)); checkcudaerrors(cudagraphicsmapresources(1, &cgr, 0)); uchar4 * device_ptr = 0; size_t num_bytes; checkcudaerrors(cudagraphicsresourcegetmappedpointer(                (void **)&device_ptr, &num_bytes, cgr));

this works fine , device_ptr not pointer cuda memory. now, @ point want resample image using bilinear interpolation. seems preferred way in cuda map device data cuda texture memory , perform interpolation using tex2d calls.

now, question imaging data exists in opengl texture memory , wonder if there way avoid calling cudabindtexture2d again , somehow use opengl texture within cuda interpolation?

yes can directly read/write opengl texture tex2d.

  1. initialize graphic ressource

    struct cudagraphicsresource *vbo_res; cudagraphicsglregisterimage(&vbo_res, gl_buffer,gl_target, cudagraphicsregisterflagssurfaceloadstore);

  2. map ressource array (every frame)

    cudaarray *array; cudagraphicsmapresources(1, &vbo_res, 0); cudagraphicssubresourcegetmappedarray(&array, vbo_res, 0,0);

  3. bind texture array

    texture<uchar4, cudatexturetype2d, cudareadmodenormalizedfloat> texref; cudabindtexturetoarray(texref, (cudaarray *)array)); texref.filtermode = cudafiltermodelinear;

note:

if texref resides in global memory can accessed in cuda kernel float4 rgba = tex2d( texref, u,v);


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