Cycles:
[blender.git] / intern / cycles / app / cycles_xml.cpp
1 /*
2  * Copyright 2011, Blender Foundation.
3  *
4  * This program is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU General Public License
6  * as published by the Free Software Foundation; either version 2
7  * of the License, or (at your option) any later version.
8  *
9  * This program is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software Foundation,
16  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
17  */
18
19 #include <stdio.h>
20
21 #include <sstream>
22 #include <algorithm>
23 #include <iterator>
24
25 #include "camera.h"
26 #include "film.h"
27 #include "graph.h"
28 #include "integrator.h"
29 #include "light.h"
30 #include "mesh.h"
31 #include "nodes.h"
32 #include "object.h"
33 #include "shader.h"
34 #include "scene.h"
35
36 #include "subd_mesh.h"
37 #include "subd_patch.h"
38 #include "subd_split.h"
39
40 #include "util_debug.h"
41 #include "util_foreach.h"
42 #include "util_path.h"
43 #include "util_transform.h"
44 #include "util_xml.h"
45
46 #include "cycles_xml.h"
47
48 CCL_NAMESPACE_BEGIN
49
50 /* XML reading state */
51
52 struct XMLReadState {
53         Scene *scene;           /* scene pointer */
54         Transform tfm;          /* current transform state */
55         bool smooth;            /* smooth normal state */
56         int shader;                     /* current shader */
57         string base;            /* base path to current file*/
58         float dicing_rate;      /* current dicing rate */
59         Mesh::DisplacementMethod displacement_method;
60 };
61
62 /* Attribute Reading */
63
64 static bool xml_read_bool(bool *value, pugi::xml_node node, const char *name)
65 {
66         pugi::xml_attribute attr = node.attribute(name);
67
68         if(attr) {
69                 *value = (string_iequals(attr.value(), "true")) || (atoi(attr.value()) != 0);
70                 return true;
71         }
72
73         return false;
74 }
75
76 static bool xml_read_int(int *value, pugi::xml_node node, const char *name)
77 {
78         pugi::xml_attribute attr = node.attribute(name);
79
80         if(attr) {
81                 *value = atoi(attr.value());
82                 return true;
83         }
84
85         return false;
86 }
87
88 static bool xml_read_int_array(vector<int>& value, pugi::xml_node node, const char *name)
89 {
90         pugi::xml_attribute attr = node.attribute(name);
91
92         if(attr) {
93                 vector<string> tokens;
94                 string_split(tokens, attr.value());
95
96                 foreach(const string& token, tokens)
97                         value.push_back(atoi(token.c_str()));
98
99                 return true;
100         }
101
102         return false;
103 }
104
105 static bool xml_read_float(float *value, pugi::xml_node node, const char *name)
106 {
107         pugi::xml_attribute attr = node.attribute(name);
108
109         if(attr) {
110                 *value = atof(attr.value());
111                 return true;
112         }
113
114         return false;
115 }
116
117 static bool xml_read_float_array(vector<float>& value, pugi::xml_node node, const char *name)
118 {
119         pugi::xml_attribute attr = node.attribute(name);
120
121         if(attr) {
122                 vector<string> tokens;
123                 string_split(tokens, attr.value());
124
125                 foreach(const string& token, tokens)
126                         value.push_back(atof(token.c_str()));
127
128                 return true;
129         }
130
131         return false;
132 }
133
134 static bool xml_read_float3(float3 *value, pugi::xml_node node, const char *name)
135 {
136         vector<float> array;
137
138         if(xml_read_float_array(array, node, name) && array.size() == 3) {
139                 *value = make_float3(array[0], array[1], array[2]);
140                 return true;
141         }
142
143         return false;
144 }
145
146 static bool xml_read_float3_array(vector<float3>& value, pugi::xml_node node, const char *name)
147 {
148         vector<float> array;
149
150         if(xml_read_float_array(array, node, name)) {
151                 for(size_t i = 0; i < array.size(); i += 3)
152                         value.push_back(make_float3(array[i+0], array[i+1], array[i+2]));
153
154                 return true;
155         }
156
157         return false;
158 }
159
160 static bool xml_read_float4(float4 *value, pugi::xml_node node, const char *name)
161 {
162         vector<float> array;
163
164         if(xml_read_float_array(array, node, name) && array.size() == 4) {
165                 *value = make_float4(array[0], array[1], array[2], array[3]);
166                 return true;
167         }
168
169         return false;
170 }
171
172 static bool xml_read_string(string *str, pugi::xml_node node, const char *name)
173 {
174         pugi::xml_attribute attr = node.attribute(name);
175
176         if(attr) {
177                 *str = attr.value();
178                 return true;
179         }
180
181         return false;
182 }
183
184 static bool xml_read_ustring(ustring *str, pugi::xml_node node, const char *name)
185 {
186         pugi::xml_attribute attr = node.attribute(name);
187
188         if(attr) {
189                 *str = ustring(attr.value());
190                 return true;
191         }
192
193         return false;
194 }
195
196 static bool xml_equal_string(pugi::xml_node node, const char *name, const char *value)
197 {
198         pugi::xml_attribute attr = node.attribute(name);
199
200         if(attr)
201                 return string_iequals(attr.value(), value);
202         
203         return false;
204 }
205
206 static bool xml_read_enum(ustring *str, ShaderEnum& enm, pugi::xml_node node, const char *name)
207 {
208         pugi::xml_attribute attr = node.attribute(name);
209
210         if(attr) {
211                 ustring ustr(attr.value());
212
213                 if(enm.exists(ustr)) {
214                         *str = ustr;
215                         return true;
216                 }
217                 else
218                         fprintf(stderr, "Unknown value \"%s\" for attribute \"%s\".\n", ustr.c_str(), name);
219         }
220
221         return false;
222 }
223
224 /* Film */
225
226 static void xml_read_film(const XMLReadState& state, pugi::xml_node node)
227 {
228         Camera *cam = state.scene->camera;
229
230         xml_read_int(&cam->width, node, "width");
231         xml_read_int(&cam->height, node, "height");
232
233         float aspect = (float)cam->width/(float)cam->height;
234
235         if(cam->width >= cam->height) {
236                 cam->left = -aspect;
237                 cam->right = aspect;
238                 cam->bottom = -1.0f;
239                 cam->top = 1.0f;
240         }
241         else {
242                 cam->left = -1.0f;
243                 cam->right = 1.0f;
244                 cam->bottom = -1.0f/aspect;
245                 cam->top = 1.0f/aspect;
246         }
247
248         cam->need_update = true;
249         cam->update();
250 }
251
252 /* Integrator */
253
254 static void xml_read_integrator(const XMLReadState& state, pugi::xml_node node)
255 {
256         Integrator *integrator = state.scene->integrator;
257
258         xml_read_int(&integrator->min_bounce, node, "min_bounce");
259         xml_read_int(&integrator->max_bounce, node, "max_bounce");
260         xml_read_bool(&integrator->no_caustics, node, "no_caustics");
261         xml_read_float(&integrator->blur_caustics, node, "blur_caustics");
262 }
263
264 /* Camera */
265
266 static void xml_read_camera(const XMLReadState& state, pugi::xml_node node)
267 {
268         Camera *cam = state.scene->camera;
269
270         if(xml_read_float(&cam->fov, node, "fov"))
271                 cam->fov *= M_PI/180.0f;
272
273         xml_read_float(&cam->nearclip, node, "nearclip");
274         xml_read_float(&cam->farclip, node, "farclip");
275         xml_read_float(&cam->aperturesize, node, "aperturesize"); // 0.5*focallength/fstop
276         xml_read_float(&cam->focaldistance, node, "focaldistance");
277         xml_read_float(&cam->shutteropen, node, "shutteropen");
278         xml_read_float(&cam->shutterclose, node, "shutterclose");
279
280         if(xml_equal_string(node, "type", "orthographic"))
281                 cam->ortho = true;
282         else if(xml_equal_string(node, "type", "perspective"))
283                 cam->ortho = false;
284
285         cam->matrix = state.tfm;
286
287         cam->need_update = true;
288         cam->update();
289 }
290
291 /* Shader */
292
293 static string xml_socket_name(const char *name)
294 {
295         string sname = name;
296         size_t i;
297
298         while((i = sname.find(" ")) != string::npos)
299                 sname.replace(i, 1, "");
300         
301         return sname;
302 }
303
304 static void xml_read_shader_graph(const XMLReadState& state, Shader *shader, pugi::xml_node graph_node)
305 {
306         ShaderGraph *graph = new ShaderGraph();
307
308         map<string, ShaderNode*> nodemap;
309
310         nodemap["output"] = graph->output();
311
312         for(pugi::xml_node node = graph_node.first_child(); node; node = node.next_sibling()) {
313                 ShaderNode *snode = NULL;
314
315                 if(string_iequals(node.name(), "image_texture")) {
316                         ImageTextureNode *img = new ImageTextureNode();
317
318                         xml_read_string(&img->filename, node, "src");
319                         img->filename = path_join(state.base, img->filename);
320
321                         snode = img;
322                 }
323                 else if(string_iequals(node.name(), "environment_texture")) {
324                         EnvironmentTextureNode *env = new EnvironmentTextureNode();
325
326                         xml_read_string(&env->filename, node, "src");
327                         env->filename = path_join(state.base, env->filename);
328
329                         snode = env;
330                 }
331                 else if(string_iequals(node.name(), "sky_texture")) {
332                         SkyTextureNode *sky = new SkyTextureNode();
333
334                         xml_read_float3(&sky->sun_direction, node, "sun_direction");
335                         xml_read_float(&sky->turbidity, node, "turbidity");
336                         
337                         snode = sky;
338                 }
339                 else if(string_iequals(node.name(), "noise_texture")) {
340                         snode = new NoiseTextureNode();
341                 }
342                 else if(string_iequals(node.name(), "gradient_texture")) {
343                         GradientTextureNode *blend = new GradientTextureNode();
344                         xml_read_enum(&blend->type, GradientTextureNode::type_enum, node, "type");
345                         snode = blend;
346                 }
347                 else if(string_iequals(node.name(), "voronoi_texture")) {
348                         VoronoiTextureNode *voronoi = new VoronoiTextureNode();
349                         xml_read_enum(&voronoi->coloring, VoronoiTextureNode::coloring_enum, node, "coloring");
350                         snode = voronoi;
351                 }
352                 else if(string_iequals(node.name(), "musgrave_texture")) {
353                         MusgraveTextureNode *musgrave = new MusgraveTextureNode();
354                         xml_read_enum(&musgrave->type, MusgraveTextureNode::type_enum, node, "type");
355                         snode = musgrave;
356                 }
357                 else if(string_iequals(node.name(), "magic_texture")) {
358                         MagicTextureNode *magic = new MagicTextureNode();
359                         xml_read_int(&magic->depth, node, "depth");
360                         snode = magic;
361                 }
362                 else if(string_iequals(node.name(), "noise_texture")) {
363                         NoiseTextureNode *dist = new NoiseTextureNode();
364                         snode = dist;
365                 }
366                 else if(string_iequals(node.name(), "wave_texture")) {
367                         WaveTextureNode *wood = new WaveTextureNode();
368                         xml_read_enum(&wood->type, WaveTextureNode::type_enum, node, "type");
369                         snode = wood;
370                 }
371                 else if(string_iequals(node.name(), "mapping")) {
372                         snode = new MappingNode();
373                 }
374                 else if(string_iequals(node.name(), "ward_bsdf")) {
375                         snode = new WardBsdfNode();
376                 }
377                 else if(string_iequals(node.name(), "diffuse_bsdf")) {
378                         snode = new DiffuseBsdfNode();
379                 }
380                 else if(string_iequals(node.name(), "translucent_bsdf")) {
381                         snode = new TranslucentBsdfNode();
382                 }
383                 else if(string_iequals(node.name(), "transparent_bsdf")) {
384                         snode = new TransparentBsdfNode();
385                 }
386                 else if(string_iequals(node.name(), "velvet_bsdf")) {
387                         snode = new VelvetBsdfNode();
388                 }
389                 else if(string_iequals(node.name(), "glossy_bsdf")) {
390                         GlossyBsdfNode *glossy = new GlossyBsdfNode();
391                         xml_read_enum(&glossy->distribution, GlossyBsdfNode::distribution_enum, node, "distribution");
392                         snode = glossy;
393                 }
394                 else if(string_iequals(node.name(), "glass_bsdf")) {
395                         GlassBsdfNode *diel = new GlassBsdfNode();
396                         xml_read_enum(&diel->distribution, GlassBsdfNode::distribution_enum, node, "distribution");
397                         snode = diel;
398                 }
399                 else if(string_iequals(node.name(), "emission")) {
400                         EmissionNode *emission = new EmissionNode();
401                         xml_read_bool(&emission->total_power, node, "total_power");
402                         snode = emission;
403                 }
404                 else if(string_iequals(node.name(), "background")) {
405                         snode = new BackgroundNode();
406                 }
407                 else if(string_iequals(node.name(), "transparent_volume")) {
408                         snode = new TransparentVolumeNode();
409                 }
410                 else if(string_iequals(node.name(), "isotropic_volume")) {
411                         snode = new IsotropicVolumeNode();
412                 }
413                 else if(string_iequals(node.name(), "geometry")) {
414                         snode = new GeometryNode();
415                 }
416                 else if(string_iequals(node.name(), "texture_coordinate")) {
417                         snode = new TextureCoordinateNode();
418                 }
419                 else if(string_iequals(node.name(), "lightPath")) {
420                         snode = new LightPathNode();
421                 }
422                 else if(string_iequals(node.name(), "value")) {
423                         ValueNode *value = new ValueNode();
424                         xml_read_float(&value->value, node, "value");
425                         snode = value;
426                 }
427                 else if(string_iequals(node.name(), "color")) {
428                         ColorNode *color = new ColorNode();
429                         xml_read_float3(&color->value, node, "value");
430                         snode = color;
431                 }
432                 else if(string_iequals(node.name(), "mix_closure")) {
433                         snode = new MixClosureNode();
434                 }
435                 else if(string_iequals(node.name(), "add_closure")) {
436                         snode = new AddClosureNode();
437                 }
438                 else if(string_iequals(node.name(), "mix")) {
439                         MixNode *mix = new MixNode();
440                         xml_read_enum(&mix->type, MixNode::type_enum, node, "type");
441                         snode = mix;
442                 }
443                 else if(string_iequals(node.name(), "combine_rgb")) {
444                         snode = new CombineRGBNode();
445                 }
446                 else if(string_iequals(node.name(), "separate_rgb")) {
447                         snode = new SeparateRGBNode();
448                 }
449                 else if(string_iequals(node.name(), "attribute")) {
450                         AttributeNode *attr = new AttributeNode();
451                         xml_read_ustring(&attr->attribute, node, "attribute");
452                         snode = attr;
453                 }
454                 else if(string_iequals(node.name(), "fresnel")) {
455                         snode = new FresnelNode();
456                 }
457                 else if(string_iequals(node.name(), "math")) {
458                         MathNode *math = new MathNode();
459                         xml_read_enum(&math->type, MathNode::type_enum, node, "type");
460                         snode = math;
461                 }
462                 else if(string_iequals(node.name(), "vector_math")) {
463                         VectorMathNode *vmath = new VectorMathNode();
464                         xml_read_enum(&vmath->type, VectorMathNode::type_enum, node, "type");
465                         snode = vmath;
466                 }
467                 else if(string_iequals(node.name(), "connect")) {
468                         /* connect nodes */
469                         vector<string> from_tokens, to_tokens;
470
471                         string_split(from_tokens, node.attribute("from").value());
472                         string_split(to_tokens, node.attribute("to").value());
473
474                         if(from_tokens.size() == 2 && to_tokens.size() == 2) {
475                                 /* find nodes and sockets */
476                                 ShaderOutput *output = NULL;
477                                 ShaderInput *input = NULL;
478
479                                 if(nodemap.find(from_tokens[0]) != nodemap.end()) {
480                                         ShaderNode *fromnode = nodemap[from_tokens[0]];
481
482                                         foreach(ShaderOutput *out, fromnode->outputs)
483                                                 if(string_iequals(xml_socket_name(out->name), from_tokens[1]))
484                                                         output = out;
485
486                                         if(!output)
487                                                 fprintf(stderr, "Unknown output socket name \"%s\" on \"%s\".\n", from_tokens[1].c_str(), from_tokens[0].c_str());
488                                 }
489                                 else
490                                         fprintf(stderr, "Unknown shader node name \"%s\".\n", from_tokens[0].c_str());
491
492                                 if(nodemap.find(to_tokens[0]) != nodemap.end()) {
493                                         ShaderNode *tonode = nodemap[to_tokens[0]];
494
495                                         foreach(ShaderInput *in, tonode->inputs)
496                                                 if(string_iequals(xml_socket_name(in->name), to_tokens[1]))
497                                                         input = in;
498
499                                         if(!input)
500                                                 fprintf(stderr, "Unknown input socket name \"%s\" on \"%s\".\n", to_tokens[1].c_str(), to_tokens[0].c_str());
501                                 }
502                                 else
503                                         fprintf(stderr, "Unknown shader node name \"%s\".\n", to_tokens[0].c_str());
504
505                                 /* connect */
506                                 if(output && input)
507                                         graph->connect(output, input);
508                         }
509                         else
510                                 fprintf(stderr, "Invalid from or to value for connect node.\n");
511                 }
512                 else
513                         fprintf(stderr, "Unknown shader node \"%s\".\n", node.name());
514
515                 if(snode) {
516                         /* add to graph */
517                         graph->add(snode);
518
519                         /* add to map for name lookups */
520                         string name = "";
521                         xml_read_string(&name, node, "name");
522
523                         nodemap[name] = snode;
524
525                         /* read input values */
526                         for(pugi::xml_attribute attr = node.first_attribute(); attr; attr = attr.next_attribute()) {
527                                 foreach(ShaderInput *in, snode->inputs) {
528                                         if(string_iequals(in->name, attr.name())) {
529                                                 switch(in->type) {
530                                                         case SHADER_SOCKET_FLOAT:
531                                                                 xml_read_float(&in->value.x, node, attr.name());
532                                                                 break;
533                                                         case SHADER_SOCKET_COLOR:
534                                                         case SHADER_SOCKET_VECTOR:
535                                                         case SHADER_SOCKET_POINT:
536                                                         case SHADER_SOCKET_NORMAL:
537                                                                 xml_read_float3(&in->value, node, attr.name());
538                                                                 break;
539                                                         default:
540                                                                 break;
541                                                 }
542                                         }
543                                 }
544                         }
545                 }
546         }
547
548         shader->set_graph(graph);
549         shader->tag_update(state.scene);
550 }
551
552 static void xml_read_shader(const XMLReadState& state, pugi::xml_node node)
553 {
554         Shader *shader = new Shader();
555         xml_read_string(&shader->name, node, "name");
556         xml_read_shader_graph(state, shader, node);
557         state.scene->shaders.push_back(shader);
558 }
559
560 /* Background */
561
562 static void xml_read_background(const XMLReadState& state, pugi::xml_node node)
563 {
564         Shader *shader = state.scene->shaders[state.scene->default_background];
565
566         xml_read_shader_graph(state, shader, node);
567 }
568
569 /* Mesh */
570
571 static Mesh *xml_add_mesh(Scene *scene, const Transform& tfm)
572 {
573         /* create mesh */
574         Mesh *mesh = new Mesh();
575         scene->meshes.push_back(mesh);
576
577         /* create object*/
578         Object *object = new Object();
579         object->mesh = mesh;
580         object->tfm = tfm;
581         scene->objects.push_back(object);
582
583         return mesh;
584 }
585
586 static void xml_read_mesh(const XMLReadState& state, pugi::xml_node node)
587 {
588         /* add mesh */
589         Mesh *mesh = xml_add_mesh(state.scene, state.tfm);
590         mesh->used_shaders.push_back(state.shader);
591
592         /* read state */
593         int shader = state.shader;
594         bool smooth = state.smooth;
595
596         mesh->displacement_method = state.displacement_method;
597
598         /* read vertices and polygons, RIB style */
599         vector<float3> P;
600         vector<int> verts, nverts;
601
602         xml_read_float3_array(P, node, "P");
603         xml_read_int_array(verts, node, "verts");
604         xml_read_int_array(nverts, node, "nverts");
605
606         if(xml_equal_string(node, "subdivision", "catmull-clark")) {
607                 /* create subd mesh */
608                 SubdMesh sdmesh;
609
610                 /* create subd vertices */
611                 for(size_t i = 0; i < P.size(); i++)
612                         sdmesh.add_vert(P[i]);
613
614                 /* create subd faces */
615                 int index_offset = 0;
616
617                 for(size_t i = 0; i < nverts.size(); i++) {
618                         if(nverts[i] == 4) {
619                                 int v0 = verts[index_offset + 0];
620                                 int v1 = verts[index_offset + 1];
621                                 int v2 = verts[index_offset + 2];
622                                 int v3 = verts[index_offset + 3];
623
624                                 sdmesh.add_face(v0, v1, v2, v3);
625                         }
626                         else {
627                                 for(int j = 0; j < nverts[i]-2; j++) {
628                                         int v0 = verts[index_offset];
629                                         int v1 = verts[index_offset + j + 1];
630                                         int v2 = verts[index_offset + j + 2];;
631
632                                         sdmesh.add_face(v0, v1, v2);
633                                 }
634                         }
635
636                         index_offset += nverts[i];
637                 }
638
639                 /* finalize subd mesh */
640                 sdmesh.link_boundary();
641
642                 /* subdivide */
643                 DiagSplit dsplit;
644                 //dsplit.camera = state.scene->camera;
645                 //dsplit.dicing_rate = 5.0f;
646                 dsplit.dicing_rate = state.dicing_rate;
647                 xml_read_float(&dsplit.dicing_rate, node, "dicing_rate");
648                 sdmesh.tesselate(&dsplit, false, mesh, shader, smooth);
649         }
650         else {
651                 /* create vertices */
652                 mesh->verts = P;
653
654                 /* create triangles */
655                 int index_offset = 0;
656
657                 for(size_t i = 0; i < nverts.size(); i++) {
658                         for(int j = 0; j < nverts[i]-2; j++) {
659                                 int v0 = verts[index_offset];
660                                 int v1 = verts[index_offset + j + 1];
661                                 int v2 = verts[index_offset + j + 2];
662
663                                 assert(v0 < (int)P.size());
664                                 assert(v1 < (int)P.size());
665                                 assert(v2 < (int)P.size());
666
667                                 mesh->add_triangle(v0, v1, v2, shader, smooth);
668                         }
669
670                         index_offset += nverts[i];
671                 }
672         }
673
674         /* temporary for test compatibility */
675         mesh->attributes.remove(Attribute::STD_VERTEX_NORMAL);
676 }
677
678 /* Patch */
679
680 static void xml_read_patch(const XMLReadState& state, pugi::xml_node node)
681 {
682         /* read patch */
683         Patch *patch = NULL;
684
685         vector<float3> P;
686         xml_read_float3_array(P, node, "P");
687
688         if(xml_equal_string(node, "type", "bilinear")) {
689                 /* bilinear patch */
690                 if(P.size() == 4) {
691                         LinearQuadPatch *bpatch = new LinearQuadPatch();
692
693                         for(int i = 0; i < 4; i++)
694                                 P[i] = transform(&state.tfm, P[i]);
695                         memcpy(bpatch->hull, &P[0], sizeof(bpatch->hull));
696
697                         patch = bpatch;
698                 }
699                 else
700                         fprintf(stderr, "Invalid number of control points for bilinear patch.\n");
701         }
702         else if(xml_equal_string(node, "type", "bicubic")) {
703                 /* bicubic patch */
704                 if(P.size() == 16) {
705                         BicubicPatch *bpatch = new BicubicPatch();
706
707                         for(int i = 0; i < 16; i++)
708                                 P[i] = transform(&state.tfm, P[i]);
709                         memcpy(bpatch->hull, &P[0], sizeof(bpatch->hull));
710
711                         patch = bpatch;
712                 }
713                 else
714                         fprintf(stderr, "Invalid number of control points for bicubic patch.\n");
715         }
716         else
717                 fprintf(stderr, "Unknown patch type.\n");
718
719         if(patch) {
720                 /* add mesh */
721                 Mesh *mesh = xml_add_mesh(state.scene, transform_identity());
722
723                 mesh->used_shaders.push_back(state.shader);
724
725                 /* split */
726                 DiagSplit dsplit;
727                 //dsplit.camera = state.scene->camera;
728                 //dsplit.dicing_rate = 5.0f;
729                 dsplit.dicing_rate = state.dicing_rate;
730                 xml_read_float(&dsplit.dicing_rate, node, "dicing_rate");
731                 dsplit.split_quad(mesh, patch, state.shader, state.smooth);
732
733                 delete patch;
734
735                 /* temporary for test compatibility */
736                 mesh->attributes.remove(Attribute::STD_VERTEX_NORMAL);
737         }
738 }
739
740 /* Light */
741
742 static void xml_read_light(const XMLReadState& state, pugi::xml_node node)
743 {
744         Light *light = new Light();
745         light->shader = state.shader;
746         xml_read_float3(&light->co, node, "P");
747         light->co = transform(&state.tfm, light->co);
748
749         state.scene->lights.push_back(light);
750 }
751
752 /* Transform */
753
754 static void xml_read_transform(pugi::xml_node node, Transform& tfm)
755 {
756         if(node.attribute("matrix")) {
757                 vector<float> matrix;
758                 if(xml_read_float_array(matrix, node, "matrix") && matrix.size() == 16)
759                         tfm = tfm * transform_transpose((*(Transform*)&matrix[0]));
760         }
761
762         if(node.attribute("translate")) {
763                 float3 translate = make_float3(0.0f, 0.0f, 0.0f);
764                 xml_read_float3(&translate, node, "translate");
765                 tfm = tfm * transform_translate(translate);
766         }
767
768         if(node.attribute("rotate")) {
769                 float4 rotate = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
770                 xml_read_float4(&rotate, node, "rotate");
771                 tfm = tfm * transform_rotate(rotate.x*M_PI/180.0f, make_float3(rotate.y, rotate.z, rotate.w));
772         }
773
774         if(node.attribute("scale")) {
775                 float3 scale = make_float3(0.0f, 0.0f, 0.0f);
776                 xml_read_float3(&scale, node, "scale");
777                 tfm = tfm * transform_scale(scale);
778         }
779 }
780
781 /* State */
782
783 static void xml_read_state(XMLReadState& state, pugi::xml_node node)
784 {
785         /* read shader */
786         string shadername;
787
788         if(xml_read_string(&shadername, node, "shader")) {
789                 int i = 0;
790                 bool found = false;
791
792                 foreach(Shader *shader, state.scene->shaders) {
793                         if(shader->name == shadername) {
794                                 state.shader = i;
795                                 found = true;
796                                 break;
797                         }
798
799                         i++;
800                 }
801
802                 if(!found)
803                         fprintf(stderr, "Unknown shader \"%s\".\n", shadername.c_str());
804         }
805
806         xml_read_float(&state.dicing_rate, node, "dicing_rate");
807
808         /* read smooth/flat */
809         if(xml_equal_string(node, "interpolation", "smooth"))
810                 state.smooth = true;
811         else if(xml_equal_string(node, "interpolation", "flat"))
812                 state.smooth = false;
813
814         /* read displacement method */
815         if(xml_equal_string(node, "displacement_method", "true"))
816                 state.displacement_method = Mesh::DISPLACE_TRUE;
817         else if(xml_equal_string(node, "displacement_method", "bump"))
818                 state.displacement_method = Mesh::DISPLACE_BUMP;
819         else if(xml_equal_string(node, "displacement_method", "both"))
820                 state.displacement_method = Mesh::DISPLACE_BOTH;
821 }
822
823 /* Scene */
824
825 static void xml_read_include(const XMLReadState& state, const string& src);
826
827 static void xml_read_scene(const XMLReadState& state, pugi::xml_node scene_node)
828 {
829         for(pugi::xml_node node = scene_node.first_child(); node; node = node.next_sibling()) {
830                 if(string_iequals(node.name(), "film")) {
831                         xml_read_film(state, node);
832                 }
833                 else if(string_iequals(node.name(), "integrator")) {
834                         xml_read_integrator(state, node);
835                 }
836                 else if(string_iequals(node.name(), "camera")) {
837                         xml_read_camera(state, node);
838                 }
839                 else if(string_iequals(node.name(), "shader")) {
840                         xml_read_shader(state, node);
841                 }
842                 else if(string_iequals(node.name(), "background")) {
843                         xml_read_background(state, node);
844                 }
845                 else if(string_iequals(node.name(), "mesh")) {
846                         xml_read_mesh(state, node);
847                 }
848                 else if(string_iequals(node.name(), "patch")) {
849                         xml_read_patch(state, node);
850                 }
851                 else if(string_iequals(node.name(), "light")) {
852                         xml_read_light(state, node);
853                 }
854                 else if(string_iequals(node.name(), "transform")) {
855                         XMLReadState substate = state;
856
857                         xml_read_transform(node, substate.tfm);
858                         xml_read_scene(substate, node);
859                 }
860                 else if(string_iequals(node.name(), "state")) {
861                         XMLReadState substate = state;
862
863                         xml_read_state(substate, node);
864                         xml_read_scene(substate, node);
865                 }
866                 else if(string_iequals(node.name(), "include")) {
867                         string src;
868
869                         if(xml_read_string(&src, node, "src"))
870                                 xml_read_include(state, src);
871                 }
872                 else
873                         fprintf(stderr, "Unknown node \"%s\".\n", node.name());
874         }
875 }
876
877 /* Include */
878
879 static void xml_read_include(const XMLReadState& state, const string& src)
880 {
881         /* open XML document */
882         pugi::xml_document doc;
883         pugi::xml_parse_result parse_result;
884
885         string path = path_join(state.base, src);
886         parse_result = doc.load_file(path.c_str());
887
888         if(parse_result) {
889                 XMLReadState substate = state;
890                 substate.base = path_dirname(path);
891
892                 xml_read_scene(substate, doc);
893         }
894         else
895                 fprintf(stderr, "%s read error: %s\n", src.c_str(), parse_result.description());
896 }
897
898 /* File */
899
900 void xml_read_file(Scene *scene, const char *filepath)
901 {
902         XMLReadState state;
903
904         state.scene = scene;
905         state.tfm = transform_identity();
906         state.shader = scene->default_surface;
907         state.smooth = false;
908         state.dicing_rate = 0.1f;
909         state.base = path_dirname(filepath);
910
911         xml_read_include(state, path_filename(filepath));
912
913         scene->params.bvh_type = SceneParams::BVH_STATIC;
914 }
915
916 CCL_NAMESPACE_END
917