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/* $Id$ */
/*
libg3d - 3D object loading library
Copyright (C) 2005-2009 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 <g3d/types.h>
#include <g3d/stream.h>
#include <g3d/matrix.h>
gboolean ta_3do_read_children(G3DContext *context, G3DStream *stream,
GSList **list, G3DMaterial *materials);
gboolean ta_3do_load_object(G3DContext *context, G3DStream *stream,
G3DModel *model, G3DMaterial *materials)
{
return ta_3do_read_children(context, stream, &(model->objects), materials);
}
gboolean ta_3do_read_children(G3DContext *context, G3DStream *stream,
GSList **list, G3DMaterial *materials)
{
G3DObject *object;
G3DFace *face;
goffset off_save, off_sav2, off_sibl, off_chld, off_vert, off_prim, off_i;
guint32 num_prims, colidx;
gchar buffer[1025];
gint32 i, j, x, y, z;
while(!g3d_stream_eof(stream)) {
/* signature */
if(g3d_stream_read_int32_le(stream) != 1)
return FALSE;
object = g_new0(G3DObject, 1);
*list = g_slist_append(*list, object);
/* number of vertices */
object->vertex_count = g3d_stream_read_int32_le(stream);
object->vertex_data = g_new0(G3DFloat, 3 * object->vertex_count);
/* number of primitives */
num_prims = g3d_stream_read_int32_le(stream);
/* offset of selection primitive */
g3d_stream_read_int32_le(stream);
/* translation from parent */
x = g3d_stream_read_int32_le(stream);
y = g3d_stream_read_int32_le(stream);
z = g3d_stream_read_int32_le(stream);
object->transformation = g_new0(G3DTransformation, 1);
g3d_matrix_identity(object->transformation->matrix);
g3d_matrix_translate(x, y, z, object->transformation->matrix);
/* offset of object name */
off_save = g3d_stream_tell(stream) + 4;
g3d_stream_seek(stream, g3d_stream_read_int32_le(stream), G_SEEK_SET);
g3d_stream_read_cstr(stream, buffer, 1024);
buffer[1024] = '\0';
object->name = g_strdup(buffer);
g3d_stream_seek(stream, off_save, G_SEEK_SET);
#if DEBUG > 1
g_debug("TA: object '%s'", object->name);
#endif
/* always 0 */
g3d_stream_read_int32_le(stream);
/* offset of vertex array */
off_vert = g3d_stream_read_int32_le(stream);
off_save = g3d_stream_tell(stream);
g3d_stream_seek(stream, off_vert, G_SEEK_SET);
for(i = 0; i < object->vertex_count; i ++)
{
object->vertex_data[i * 3 + 0] = g3d_stream_read_int32_le(stream);
object->vertex_data[i * 3 + 1] = g3d_stream_read_int32_le(stream);
object->vertex_data[i * 3 + 2] = g3d_stream_read_int32_le(stream);
}
g3d_stream_seek(stream, off_save, G_SEEK_SET);
/* offset of primitive array */
off_prim = g3d_stream_read_int32_le(stream);
off_save = g3d_stream_tell(stream);
g3d_stream_seek(stream, off_prim, G_SEEK_SET);
for(i = 0; i < num_prims; i ++)
{
face = g_new0(G3DFace, 1);
/* color index */
colidx = g3d_stream_read_int32_le(stream);
#if DEBUG > 2
g_debug("TA: color index: %d", colidx);
#endif
if(colidx > 255)
{
g_warning("TA: color index > 255 (%d)\n", colidx);
g_free(face);
g3d_stream_skip(stream, 28);
continue;
}
face->material = &(materials[colidx]);
/* number of vertices */
face->vertex_count = g3d_stream_read_int32_le(stream);
if(face->vertex_count < 3)
{
/* skip this primitive */
g_free(face);
g3d_stream_skip(stream, 24);
continue;
}
face->vertex_indices = g_new0(guint32, face->vertex_count);
/* always 0 */
g3d_stream_read_int32_le(stream);
/* offset of vertex index array */
off_i = g3d_stream_read_int32_le(stream);
off_sav2 = g3d_stream_tell(stream);
#if DEBUG > 2
g_debug("TA: vertex index offset: 0x%08x", off_i);
#endif
g3d_stream_seek(stream, off_i, G_SEEK_SET);
for(j = 0; j < face->vertex_count; j ++)
face->vertex_indices[j] = g3d_stream_read_int16_le(stream);
g3d_stream_seek(stream, off_sav2, G_SEEK_SET);
/* offset of texture name */
g3d_stream_read_int32_le(stream);
/* unknown */
g3d_stream_skip(stream, 12);
object->faces = g_slist_prepend(object->faces, face);
}
g3d_stream_seek(stream, off_save, G_SEEK_SET);
/* offset of sibling object */
off_sibl = g3d_stream_read_int32_le(stream);
/* offset of child object */
off_chld = g3d_stream_read_int32_le(stream);
#if DEBUG > 3
g_debug("TA: child @ 0x%08x, sibling @ 0x%08x", off_chld, off_sibl);
#endif
if(off_chld != 0)
{
off_save = g3d_stream_tell(stream);
g3d_stream_seek(stream, off_chld, G_SEEK_SET);
ta_3do_read_children(context, stream, &(object->objects),
materials);
g3d_stream_seek(stream, off_save, G_SEEK_SET);
}
if(off_sibl == 0)
return TRUE;
g3d_stream_seek(stream, off_sibl, G_SEEK_SET);
}
return FALSE;
}
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