OpenSubdiv/examples/tessellateObjFile/main.cpp

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#if defined( _WIN32)
#include <windows.h>
#endif

#include <osdutil/adaptiveEvaluator.h>
#include <osdutil/uniformEvaluator.h>
#include <osdutil/topology.h>

#include <osd/error.h>

#include <vector>
#include <iostream>
#include <stdio.h>

#ifdef OPENSUBDIV_HAS_OPENMP
    #include <omp.h>
#endif

using namespace OpenSubdiv;


//------------------------------------------------------------------------------
static bool
uniformTessellate(char *inputFile, char *outputFile, std::string *errorMessage)
{

    PxOsdUtilSubdivTopology topology;
    std::vector<float> pointPositions;
    
    if (not topology.ReadFromObjFile(inputFile, &pointPositions, errorMessage)) {
        return false;
    }

    topology.refinementLevel = 2;

    PxOsdUtilUniformEvaluator uniformEvaluator;

    // Create uniformEvaluator
    if (not uniformEvaluator.Initialize(topology, errorMessage)) {
        std::cout << "Initialize failed with " << *errorMessage << "\n";        
        return false;
    }

    // Push the vertex data
    uniformEvaluator.SetCoarsePositions(pointPositions, errorMessage);

    // Refine with one thread
    if (not uniformEvaluator.Refine(1, errorMessage)) {
        std::cout << "Refine failed with " << *errorMessage << "\n";
        return false;
    }

    PxOsdUtilSubdivTopology refinedTopology;
    const float *positions = NULL;
   
    if (not uniformEvaluator.GetRefinedTopology(
            &refinedTopology, &positions, errorMessage)) {
        std::cout << "GetRefinedTopology failed with " << *errorMessage <<"\n";
        return false;
    }
    
    if (not refinedTopology.WriteObjFile(
            outputFile, positions, errorMessage)) {
        std::cout << errorMessage << std::endl;             
    }

    return true;
}


static bool
blenderStyleTessellate(char *inputFile, char *outputFile, std::string *errorMessage)
{

    PxOsdUtilSubdivTopology topology;
    std::vector<float> pointPositions;
    
    if (not topology.ReadFromObjFile(inputFile, &pointPositions, errorMessage)) {
        return false;
    }

    topology.refinementLevel = 5;

    PxOsdUtilAdaptiveEvaluator adaptiveEvaluator;

    // Create adaptiveEvaluator
    if (not adaptiveEvaluator.Initialize(topology, errorMessage)) {
        std::cout << "Initialize failed with " << *errorMessage << "\n";        
        return false;
    }

    // Push the vertex data
    adaptiveEvaluator.SetCoarsePositions(
        &(pointPositions[0]), (int) pointPositions.size(), errorMessage);

    // Refine with one thread
    if (not adaptiveEvaluator.Refine(1, errorMessage)) {
        std::cout << "Refine failed with " << *errorMessage << "\n";
        return false;
    }

    PxOsdUtilSubdivTopology refinedTopology;
    std::vector<float> positions;
   
    if (not adaptiveEvaluator.GetRefinedTopology(
            &refinedTopology, &positions, errorMessage)) {
        std::cout << "GetRefinedTopology failed with " << *errorMessage <<"\n";
        return false;
    }
    
    if (not refinedTopology.WriteObjFile(
            outputFile, &(positions[0]), errorMessage)) {
        std::cout << errorMessage << std::endl;             
    }

    return true;
}

//------------------------------------------------------------------------------
static void
callbackError(OpenSubdiv::OsdErrorType err, const char *message)
{
    printf("OsdError: %d\n", err);
    printf("%s", message);
}


//------------------------------------------------------------------------------
int main(int argc, char** argv) {



    OsdSetErrorCallback(callbackError);

    std::string errorMessage;

    if ((argc == 4) and (std::string(argv[1]) == std::string("-blender"))) {
	std::cout << "About to call blender-style tessellate\n";
	if (not blenderStyleTessellate(argv[2], argv[3], &errorMessage)) {
	    std::cout << "Failed with error: " << errorMessage << std::endl;
	    return -1;
	}
    } else if (argc != 3) {
        std::cout << "Usage: tessellate [-blender] input.obj output.obj\n";
        return false;
    } else {
	if (not uniformTessellate(argv[1], argv[2], &errorMessage)) {
	    std::cout << "Failed with error: " << errorMessage << std::endl;
	}
    }
}