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/*
libg3d - 3D object loading library
Copyright (C) 2006 Oliver Dippel <o.dippel@gmx.de>
2008 Markus Dahms <mad@automagically.de>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <locale.h>
#include <g3d/types.h>
#include <g3d/stream.h>
#include <g3d/material.h>
/*
Infos for the STL(A)-Format:
http://www.csit.fsu.edu/~burkardt/data/stla/stla.html
Infos for the STL(B)-Format:
http://www.csit.fsu.edu/~burkardt/data/stlb/stlb.html
*/
#define STL_ASCII 0
#define STL_BINARY 1
static gboolean stl_load_binary(G3DContext *context, G3DModel *model,
G3DStream *stream);
static gboolean stl_load_text(G3DContext *context, G3DModel *model,
G3DStream *stream);
EAPI
gboolean plugin_load_model_from_stream(G3DContext *context, G3DStream *stream,
G3DModel *model, gpointer user_data)
{
gchar line[1024];
guint32 type;
/* Check Filetype (ASCII or BINARY) */
type = STL_BINARY;
while(!g3d_stream_eof(stream)) {
if(!g3d_stream_read_line(stream, line, 1023))
break;
if(strstr(line, "solid")) {
setlocale(LC_NUMERIC, "C");
type = STL_ASCII;
break;
}
}
/* rewind */
g3d_stream_seek(stream, 0, G_SEEK_SET);
if (type == STL_BINARY)
return stl_load_binary(context, model, stream);
else
return stl_load_text(context, model, stream);
}
EAPI
gchar *plugin_description(G3DContext *context)
{
return g_strdup("STLA and STLB stereolithography models.\n"
"Author: Oliver Dippel");
}
EAPI
gchar **plugin_extensions(G3DContext *context)
{
return g_strsplit("stl:stla:stlb", ":", 0);
}
/*****************************************************************************/
static gboolean stl_load_binary(G3DContext *context, G3DModel *model,
G3DStream *stream)
{
G3DObject *object;
G3DMaterial *material;
G3DFace *face;
gchar name[81];
guint32 num_faces, index = 0;
gint32 n, i, j;
#if DEBUG > 0
g_debug("STL: format is BINARY");
#endif
g3d_stream_read(stream, name, 80);
name[80] = 0;
num_faces = g3d_stream_read_int32_le(stream);
object = g_new0(G3DObject, 1);
object->name = g_strdup("STL-Model");
model->objects = g_slist_append(model->objects, object);
material = g3d_material_new();
material->name = g_strdup("default material");
object->materials = g_slist_append(object->materials, material);
object->vertex_count = num_faces * 3;
#if DEBUG > 2
g_debug("STL: BINARY: vertex_count: %i", object->vertex_count);
#endif
object->vertex_data = g_new0(G3DFloat, object->vertex_count * 3);
for(n = 0; n < num_faces; n ++) {
face = g_new0(G3DFace, 1);
face->material = material;
face->vertex_count = 3;
face->vertex_indices = g_new0(guint32, face->vertex_count);
face->vertex_indices[0] = index + 0;
face->vertex_indices[1] = index + 1;
face->vertex_indices[2] = index + 2;
object->faces = g_slist_prepend(object->faces, face);
/* normal */
for(j = 0; j < 3; j ++)
g3d_stream_read_float_le(stream);
/* triangle */
for(i = 0; i < 3; i ++) {
for(j = 0; j < 3; j ++)
object->vertex_data[index * 3 + j] =
g3d_stream_read_float_le(stream);
index ++;
}
/* 2 Byte Dummy read */
g3d_stream_read_int16_le(stream);
}
return TRUE;
}
static gboolean stl_load_text(G3DContext *context, G3DModel *model,
G3DStream *stream)
{
G3DObject *object;
G3DMaterial *material;
G3DFace *face;
gchar line[1024];
guint32 index = 0;
G3DFloat x, y, z;
#if DEBUG > 0
g_debug("STL: format is ASCII");
#endif
object = g_new0(G3DObject, 1);
object->name = g_strdup("STL-Model");
model->objects = g_slist_append(model->objects, object);
material = g3d_material_new();
material->name = g_strdup("default material");
object->materials = g_slist_append(object->materials, material);
object->vertex_count = 0;
while(!g3d_stream_eof(stream)) {
line[0] = 0;
if(!g3d_stream_read_line(stream, line, 1023))
break;
g_strstrip(line);
if(strncmp(line, "solid", 5) == 0) {
g_free(object->name);
object->name = g_strdup(line + 6);
} else if(strncmp(line, "vertex", 6) == 0) {
object->vertex_count ++;
object->vertex_data = g_realloc(object->vertex_data,
object->vertex_count * 3 * sizeof(G3DFloat));
if(sscanf(line + 7, G3D_SCANF_FLOAT " " G3D_SCANF_FLOAT " " G3D_SCANF_FLOAT, &x, &y, &z) == 3) {
object->vertex_data[(object->vertex_count - 1) * 3 + 0] = x;
object->vertex_data[(object->vertex_count - 1) * 3 + 1] = y;
object->vertex_data[(object->vertex_count - 1) * 3 + 2] = z;
} else {
#if DEBUG > 0
g_debug("imp_stl: parse error in vertex line: %s", line);
#endif
}
} else if(strncmp(line, "facet", 5) == 0) {
face = g_new0(G3DFace, 1);
face->material = material;
face->vertex_count = 3;
face->vertex_indices = g_new0(guint32, face->vertex_count);
face->vertex_indices[0] = index + 0;
face->vertex_indices[1] = index + 1;
face->vertex_indices[2] = index + 2;
object->faces = g_slist_prepend(object->faces, face);
index += 3;
}
}
return TRUE;
}
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