static void
createMesh(ShapeDesc const & shapeDesc, int level) {
typedef Far::ConstIndexArray IndexArray;
typedef Far::LimitStencilTablesFactory::LocationArray LocationArray;
Shape const * shape = Shape::parseObj(shapeDesc.data.c_str(), shapeDesc.scheme);
// create Vtr mesh (topology)
OpenSubdiv::Sdc::SchemeType sdctype = GetSdcType(*shape);
OpenSubdiv::Sdc::Options sdcoptions = GetSdcOptions(*shape);
OpenSubdiv::Far::TopologyRefiner * refiner =
OpenSubdiv::Far::TopologyRefinerFactory<Shape>::Create(*shape,
OpenSubdiv::Far::TopologyRefinerFactory<Shape>::Options(sdctype, sdcoptions));
// save coarse topology (used for coarse mesh drawing)
int nedges = refiner->GetNumEdges(0),
nverts = refiner->GetNumVertices(0);
g_coarseEdges.resize(nedges*2);
g_coarseEdgeSharpness.resize(nedges);
g_coarseVertexSharpness.resize(nverts);
for(int i=0; i<nedges; ++i) {
IndexArray verts = refiner->GetEdgeVertices(0, i);
g_coarseEdges[i*2 ]=verts[0];
g_coarseEdges[i*2+1]=verts[1];
g_coarseEdgeSharpness[i]=refiner->GetEdgeSharpness(0, i);
}
for(int i=0; i<nverts; ++i) {
g_coarseVertexSharpness[i]=refiner->GetVertexSharpness(0, i);
}
g_orgPositions=shape->verts;
if (g_bilinear) {
Far::TopologyRefiner::UniformOptions options(level);
options.fullTopologyInLastLevel = true;
refiner->RefineUniform(options);
} else {
Far::TopologyRefiner::AdaptiveOptions options(level);
options.fullTopologyInLastLevel = false;
options.useSingleCreasePatch = false;
refiner->RefineAdaptive(options);
}
int nfaces = refiner->GetNumPtexFaces();
float * u = new float[g_nsamples*nfaces], * uPtr = u,
* v = new float[g_nsamples*nfaces], * vPtr = v;
std::vector<LocationArray> locs(nfaces);
srand( static_cast<int>(2147483647) ); // use a large Pell prime number
for (int face=0; face<nfaces; ++face) {
LocationArray & larray = locs[face];
larray.ptexIdx = face;
larray.numLocations = g_nsamples;
larray.s = uPtr;
larray.t = vPtr;
for (int j=0; j<g_nsamples; ++j, ++uPtr, ++vPtr) {
*uPtr = (float)rand()/(float)RAND_MAX;
*vPtr = (float)rand()/(float)RAND_MAX;
}
}
delete g_controlStencils;
g_controlStencils = Far::LimitStencilTablesFactory::Create(*refiner, locs);
delete [] u;
delete [] v;
g_nsamplesDrawn = g_controlStencils->GetNumStencils();
// Create control vertex buffer (layout: [ P(xyz) ] )
delete g_controlValues;
g_controlValues = Osd::CpuVertexBuffer::Create(3, nverts);
// Create eval context & data buffers
delete g_evalCtx;
g_evalCtx = Osd::CpuEvalStencilsContext::Create(g_controlStencils);
delete g_stencilValues;
g_stencilValues = Osd::CpuGLVertexBuffer::Create(3, g_controlStencils->GetNumStencils() * 6 );
delete shape;
delete refiner;
updateGeom();
// Bind g_stencilValues as GL_LINES VAO
glBindVertexArray(g_stencilsVAO);
glBindBuffer(GL_ARRAY_BUFFER, g_stencilValues->BindVBO());
glBindVertexArray(0);
}
