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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 <string.h>
#include <stdlib.h>
#include <g3d/types.h>
#include <g3d/stream.h>
#include "imp_blend_def.h"
#include "imp_blend_types.h"
#include "imp_blend_sdna.h"
#include "imp_blend_read.h"
#include "imp_blend_chunks.h"
static gboolean blend_read_file(BlendGlobal *global);
EAPI
gboolean plugin_load_model_from_stream(G3DContext *context, G3DStream *stream,
G3DModel *model, gpointer user_data)
{
gchar buf[BLEND_HEADER_SIZE + 1];
guint32 flags = 0, version;
BlendGlobal *global;
if(g3d_stream_read(stream, buf, BLEND_HEADER_SIZE) != BLEND_HEADER_SIZE) {
g_warning("Blend: %s: failed to read header", stream->uri);
return FALSE;
}
buf[BLEND_HEADER_SIZE] = '\0';
if(strncmp(buf, "BLENDER", 7) != 0) {
g_warning("Blend: %s: not a blender file", stream->uri);
return FALSE;
}
if(buf[7] == '_')
flags |= FLAG_POINTERSIZE_4;
if(buf[8] == 'v')
flags |= FLAG_LITTLE_ENDIAN;
version = atoi(buf + 9);
g_debug("Blend: version %.2f, %s endian, pointer size is %d",
version / 100.0,
(flags & FLAG_LITTLE_ENDIAN) ? "little" : "big",
(flags & FLAG_POINTERSIZE_4) ? 4 : 8);
if(!(flags & FLAG_POINTERSIZE_4)) {
g_warning("Blend: 8-byte pointers are not implemented as I lack a "
"test file. Please send me one :).");
return FALSE;
}
global = g_new0(BlendGlobal, 1);
global->context = context;
global->stream = stream;
global->model = model;
global->flags = flags;
blend_read_file(global);
g_free(global);
return TRUE;
}
EAPI
gchar *plugin_description(void)
{
return g_strdup("Blender models.");
}
EAPI
gchar **plugin_extensions(void)
{
return g_strsplit("blend", ":", 0);
}
/*****************************************************************************/
static inline const BlendChunkInfo *blend_get_chunk_info(guint32 code,
guint32 oid)
{
gint32 i;
for(i = 0; blend_chunks[i].code != 0; i ++)
if((blend_chunks[i].code == code) && (blend_chunks[i].oid == oid))
return &(blend_chunks[i]);
if(oid != 0)
return blend_get_chunk_info(code, 0);
return NULL;
}
static gboolean blend_read_file(BlendGlobal *global)
{
guint32 code, old, sdnanr, nr;
gsize len;
BlendLocal *local;
const BlendChunkInfo *cinfo;
const BlendSdnaStruct *sstruct;
gint i;
G3DObject *object = NULL;
G3DObject *grpobject = NULL;
guint32 object_id = 0;
while(TRUE) {
code = blend_read_uint(global->stream, global->flags);
len = blend_read_uint(global->stream, global->flags);
if(code == MKID('E','N','D','B'))
return TRUE;
old = blend_read_uint(global->stream, global->flags);
sdnanr = blend_read_uint(global->stream, global->flags);
nr = blend_read_uint(global->stream, global->flags);
if((global->sdna == NULL) && (code != MKID('D','N','A','1'))) {
g3d_stream_skip(global->stream, len);
continue;
}
cinfo = blend_get_chunk_info(code, (code == ID_DATA) ? object_id : 0);
if(cinfo == NULL)
g_warning("unknown chunk: %c%c%c%c",
blend_from_id(code, 0), blend_from_id(code, 1),
blend_from_id(code, 2), blend_from_id(code, 3));
g_debug("\\%c%c%c%c: %-20s - %8d bytes (0x%08x, %d, %d)",
blend_from_id(code, 0), blend_from_id(code, 1),
blend_from_id(code, 2), blend_from_id(code, 3),
cinfo ? cinfo->description : "(unknown)",
(int) len, old, sdnanr, nr);
if(len == 0)
return FALSE;
/* on non-DATA nodes a new object starts */
if(code != ID_DATA) {
object_id = code;
}
local = g_new0(BlendLocal, 1);
local->ndata = nr;
local->data = g_new0(BlendSdnaData *, nr);
if(global->sdna) {
for(i = 0; i < nr; i ++) {
sstruct = blend_sdna_get_struct_by_id(global->sdna, sdnanr);
if(sstruct) {
#if DEBUG > BLEND_DEBUG_STRUCT
g_debug("|struct %s /* %d */",
sstruct->name, sstruct->size);
#endif
local->data[i] = blend_sdna_data_read(global->sdna,
sstruct, global, &len, 0);
}
}
}
local->object = object;
local->grpobject = grpobject;
local->object_id = object_id;
local->len = len;
if(cinfo && cinfo->callback)
if(!cinfo->callback(global, local))
return FALSE;
len = local->len;
object = local->object;
grpobject = local->grpobject;
for(i = 0; i < local->ndata; i ++)
if(local->data[i])
blend_sdna_data_free(local->data[i]);
g_free(local->data);
g_free(local);
/* skip remaining data */
g3d_stream_skip(global->stream, len);
}
blend_sdna_cleanup(global->sdna);
return TRUE;
}
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