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/** Copyright (C) 2013 David Braam - Released under terms of the AGPLv3 License */
#include <string.h>
#include <stdio.h>
#include "modelFile.h"
FILE* binaryMeshBlob = NULL;
/* Custom fgets function to support Mac line-ends in Ascii STL files. OpenSCAD produces this when used on Mac */
void* fgets_(char* ptr, size_t len, FILE* f)
{
while(len && fread(ptr, 1, 1, f) > 0)
{
if (*ptr == '\n' || *ptr == '\r')
{
*ptr = '\0';
return ptr;
}
ptr++;
len--;
}
return NULL;
}
SimpleModel* loadModelSTL_ascii(const char* filename, FMatrix3x3& matrix)
{
SimpleModel* m = new SimpleModel();
m->volumes.push_back(SimpleVolume());
SimpleVolume* vol = &m->volumes[0];
FILE* f = fopen(filename, "rt");
char buffer[1024];
FPoint3 vertex;
int n = 0;
Point3 v0(0,0,0), v1(0,0,0), v2(0,0,0);
while(fgets_(buffer, sizeof(buffer), f))
{
if (sscanf(buffer, " vertex %lf %lf %lf", &vertex.x, &vertex.y, &vertex.z) == 3)
{
n++;
switch(n)
{
case 1:
v0 = matrix.apply(vertex);
break;
case 2:
v1 = matrix.apply(vertex);
break;
case 3:
v2 = matrix.apply(vertex);
vol->addFace(v0, v1, v2);
n = 0;
break;
}
}
}
fclose(f);
return m;
}
SimpleModel* loadModelSTL_binary(const char* filename, FMatrix3x3& matrix)
{
FILE* f = fopen(filename, "rb");
char buffer[80];
uint32_t faceCount;
//Skip the header
if (fread(buffer, 80, 1, f) != 1)
{
fclose(f);
return NULL;
}
//Read the face count
if (fread(&faceCount, sizeof(uint32_t), 1, f) != 1)
{
fclose(f);
return NULL;
}
//For each face read:
//float(x,y,z) = normal, float(X,Y,Z)*3 = vertexes, uint16_t = flags
SimpleModel* m = new SimpleModel();
m->volumes.push_back(SimpleVolume());
SimpleVolume* vol = &m->volumes[0];
if(vol == NULL)
{
fclose(f);
return NULL;
}
for(unsigned int i=0;i<faceCount;i++)
{
if (fread(buffer, sizeof(float) * 3, 1, f) != 1)
{
fclose(f);
return NULL;
}
float v[9];
if (fread(v, sizeof(float) * 9, 1, f) != 1)
{
fclose(f);
return NULL;
}
Point3 v0 = matrix.apply(FPoint3(v[0], v[1], v[2]));
Point3 v1 = matrix.apply(FPoint3(v[3], v[4], v[5]));
Point3 v2 = matrix.apply(FPoint3(v[6], v[7], v[8]));
vol->addFace(v0, v1, v2);
if (fread(buffer, sizeof(uint16_t), 1, f) != 1)
{
fclose(f);
return NULL;
}
}
fclose(f);
return m;
}
SimpleModel* loadModelSTL(const char* filename, FMatrix3x3& matrix)
{
FILE* f = fopen(filename, "r");
char buffer[6];
if (f == NULL)
return NULL;
if (fread(buffer, 5, 1, f) != 1)
{
fclose(f);
return NULL;
}
fclose(f);
buffer[5] = '\0';
if (strcasecmp(buffer, "SOLID") == 0)
{
return loadModelSTL_ascii(filename, matrix);
}
return loadModelSTL_binary(filename, matrix);
}
SimpleModel* loadModel(const char* filename, FMatrix3x3& matrix)
{
const char* ext = strrchr(filename, '.');
if (ext && strcasecmp(ext, ".stl") == 0)
{
return loadModelSTL(filename, matrix);
}
if (filename[0] == '#' && binaryMeshBlob != NULL)
{
SimpleModel* m = new SimpleModel();
while(*filename == '#')
{
filename++;
m->volumes.push_back(SimpleVolume());
SimpleVolume* vol = &m->volumes[m->volumes.size()-1];
int32_t n, pNr = 0;
if (fread(&n, 1, sizeof(int32_t), binaryMeshBlob) < 1)
return NULL;
printf("Reading mesh from binary blob with %i vertexes\n", n);
Point3 v[3];
while(n)
{
float f[3];
if (fread(f, 3, sizeof(float), binaryMeshBlob) < 1)
return NULL;
FPoint3 fp(f[0], f[1], f[2]);
v[pNr++] = matrix.apply(fp);
if (pNr == 3)
{
vol->addFace(v[0], v[1], v[2]);
pNr = 0;
}
n--;
}
}
return m;
}
return NULL;
}
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