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stlbin.c
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stlbin.c
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/*
* Copyright 2016 Aki Nyrhinen <anyrhine@gmail.com>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <stdio.h>
#include <stdint.h>
#include <string.h>
static void
put16(char *buf, uint16_t val)
{
buf[0] = val & 0xff;
buf[1] = (val >> 8) & 0xff;
}
static void
put32(char *buf, uint32_t val)
{
buf[0] = val & 0xff;
buf[1] = (val >> 8) & 0xff;
buf[2] = (val >> 16) & 0xff;
buf[3] = (val >> 24) & 0xff;
}
/* TODO: write a real one */
static void
putvert(char *buf, float *vert)
{
memcpy(buf, vert, 3 * sizeof vert[0]);
}
size_t
stlbin_begin(FILE *out, char *comment, unsigned char *rgba)
{
char buf[84];
memset(buf, 0, sizeof buf);
strncpy(buf, comment, 69);
if(rgba != NULL){
strncpy(buf+70, "COLOR=", 6);
buf[76] = rgba[0];
buf[77] = rgba[1];
buf[78] = rgba[2];
buf[79] = rgba[3];
}
return fwrite(buf, 84, 1, out);
}
size_t
stlbin_facet(FILE *out, float *vert0, float *vert1, float *vert2, float *norm, unsigned char *rgba)
{
unsigned char fake[] = {128, 128, 128, 128};
char buf[50];
if(norm != NULL)
putvert(buf+0, norm);
else
memset(buf+0, 0, 12);
putvert(buf+12, vert0);
putvert(buf+24, vert1);
putvert(buf+36, vert2);
if(rgba == NULL)
rgba = fake;
put16(buf+48, rgba[0]/8 + (rgba[1]/8<<5) + (rgba[2]/8<<10));
return fwrite(buf, 50, 1, out);
}
size_t
stlbin_end(FILE *out)
{
char buf[4];
off_t off;
uint32_t ntris;
if((off = ftello(out)) == -1)
return -1;
ntris = (off - 84) / 50;
put32(buf, ntris);
if(fseek(out, 80, SEEK_SET) == -1)
return -1;
if(fwrite(buf, 4, 1, out) != 1)
return -1;
if(fseek(out, off, SEEK_SET) == -1)
return -1;
return 0;
}