cycles_xml.cpp

Go to the documentation of this file.

/*
 * Copyright 2011-2013 Blender Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#include <stdio.h>
 
#include <algorithm>
#include <iterator>
#include <sstream>
 
#include "graph/node_xml.h"
 
#include "render/background.h"
#include "render/camera.h"
#include "render/film.h"
#include "render/graph.h"
#include "render/integrator.h"
#include "render/light.h"
#include "render/mesh.h"
#include "render/nodes.h"
#include "render/object.h"
#include "render/osl.h"
#include "render/scene.h"
#include "render/shader.h"
 
#include "subd/subd_patch.h"
#include "subd/subd_split.h"
 
#include "util/util_foreach.h"
#include "util/util_path.h"
#include "util/util_projection.h"
#include "util/util_transform.h"
#include "util/util_xml.h"
 
#include "app/cycles_xml.h"
 
CCL_NAMESPACE_BEGIN
 
/* XML reading state */
 
struct XMLReadState : public XMLReader {
  Scene *scene;      /* scene pointer */
  Transform tfm;     /* current transform state */
  bool smooth;       /* smooth normal state */
  Shader *shader;    /* current shader */
  string base;       /* base path to current file*/
  float dicing_rate; /* current dicing rate */
 
  XMLReadState() : scene(NULL), smooth(false), shader(NULL), dicing_rate(1.0f)
  {
    tfm = transform_identity();
  }
};
 
/* Attribute Reading */
 
static bool xml_read_int(int *value, xml_node node, const char *name)
{
  xml_attribute attr = node.attribute(name);
 
  if (attr) {
    *value = atoi(attr.value());
    return true;
  }
 
  return false;
}
 
static bool xml_read_int_array(vector<int> &value, xml_node node, const char *name)
{
  xml_attribute attr = node.attribute(name);
 
  if (attr) {
    vector<string> tokens;
    string_split(tokens, attr.value());
 
    foreach (const string &token, tokens)
      value.push_back(atoi(token.c_str()));
 
    return true;
  }
 
  return false;
}
 
static bool xml_read_float(float *value, xml_node node, const char *name)
{
  xml_attribute attr = node.attribute(name);
 
  if (attr) {
    *value = (float)atof(attr.value());
    return true;
  }
 
  return false;
}
 
static bool xml_read_float_array(vector<float> &value, xml_node node, const char *name)
{
  xml_attribute attr = node.attribute(name);
 
  if (attr) {
    vector<string> tokens;
    string_split(tokens, attr.value());
 
    foreach (const string &token, tokens)
      value.push_back((float)atof(token.c_str()));
 
    return true;
  }
 
  return false;
}
 
static bool xml_read_float3(float3 *value, xml_node node, const char *name)
{
  vector<float> array;
 
  if (xml_read_float_array(array, node, name) && array.size() == 3) {
    *value = make_float3(array[0], array[1], array[2]);
    return true;
  }
 
  return false;
}
 
static bool xml_read_float3_array(vector<float3> &value, xml_node node, const char *name)
{
  vector<float> array;
 
  if (xml_read_float_array(array, node, name)) {
    for (size_t i = 0; i < array.size(); i += 3)
      value.push_back(make_float3(array[i + 0], array[i + 1], array[i + 2]));
 
    return true;
  }
 
  return false;
}
 
static bool xml_read_float4(float4 *value, xml_node node, const char *name)
{
  vector<float> array;
 
  if (xml_read_float_array(array, node, name) && array.size() == 4) {
    *value = make_float4(array[0], array[1], array[2], array[3]);
    return true;
  }
 
  return false;
}
 
static bool xml_read_string(string *str, xml_node node, const char *name)
{
  xml_attribute attr = node.attribute(name);
 
  if (attr) {
    *str = attr.value();
    return true;
  }
 
  return false;
}
 
static bool xml_equal_string(xml_node node, const char *name, const char *value)
{
  xml_attribute attr = node.attribute(name);
 
  if (attr)
    return string_iequals(attr.value(), value);
 
  return false;
}
 
/* Camera */
 
static void xml_read_camera(XMLReadState &state, xml_node node)
{
  Camera *cam = state.scene->camera;
 
  int width = -1, height = -1;
  xml_read_int(&width, node, "width");
  xml_read_int(&height, node, "height");
 
  cam->set_full_width(width);
  cam->set_full_height(height);
 
  xml_read_node(state, cam, node);
 
  cam->set_matrix(state.tfm);
 
  cam->need_flags_update = true;
  cam->update(state.scene);
}
 
/* Shader */
 
static void xml_read_shader_graph(XMLReadState &state, Shader *shader, xml_node graph_node)
{
  xml_read_node(state, shader, graph_node);
 
  ShaderGraph *graph = new ShaderGraph();
 
  /* local state, shader nodes can't link to nodes outside the shader graph */
  XMLReader graph_reader;
  graph_reader.node_map[ustring("output")] = graph->output();
 
  for (xml_node node = graph_node.first_child(); node; node = node.next_sibling()) {
    ustring node_name(node.name());
 
    if (node_name == "connect") {
      /* connect nodes */
      vector<string> from_tokens, to_tokens;
 
      string_split(from_tokens, node.attribute("from").value());
      string_split(to_tokens, node.attribute("to").value());
 
      if (from_tokens.size() == 2 && to_tokens.size() == 2) {
        ustring from_node_name(from_tokens[0]);
        ustring from_socket_name(from_tokens[1]);
        ustring to_node_name(to_tokens[0]);
        ustring to_socket_name(to_tokens[1]);
 
        /* find nodes and sockets */
        ShaderOutput *output = NULL;
        ShaderInput *input = NULL;
 
        if (graph_reader.node_map.find(from_node_name) != graph_reader.node_map.end()) {
          ShaderNode *fromnode = (ShaderNode *)graph_reader.node_map[from_node_name];
 
          foreach (ShaderOutput *out, fromnode->outputs)
            if (string_iequals(out->socket_type.name.string(), from_socket_name.string()))
              output = out;
 
          if (!output)
            fprintf(stderr,
                    "Unknown output socket name \"%s\" on \"%s\".\n",
                    from_node_name.c_str(),
                    from_socket_name.c_str());
        }
        else
          fprintf(stderr, "Unknown shader node name \"%s\".\n", from_node_name.c_str());
 
        if (graph_reader.node_map.find(to_node_name) != graph_reader.node_map.end()) {
          ShaderNode *tonode = (ShaderNode *)graph_reader.node_map[to_node_name];
 
          foreach (ShaderInput *in, tonode->inputs)
            if (string_iequals(in->socket_type.name.string(), to_socket_name.string()))
              input = in;
 
          if (!input)
            fprintf(stderr,
                    "Unknown input socket name \"%s\" on \"%s\".\n",
                    to_socket_name.c_str(),
                    to_node_name.c_str());
        }
        else
          fprintf(stderr, "Unknown shader node name \"%s\".\n", to_node_name.c_str());
 
        /* connect */
        if (output && input)
          graph->connect(output, input);
      }
      else
        fprintf(stderr, "Invalid from or to value for connect node.\n");
 
      continue;
    }
 
    ShaderNode *snode = NULL;
 
#ifdef WITH_OSL
    if (node_name == "osl_shader") {
      ShaderManager *manager = state.scene->shader_manager;
 
      if (manager->use_osl()) {
        std::string filepath;
 
        if (xml_read_string(&filepath, node, "src")) {
          if (path_is_relative(filepath)) {
            filepath = path_join(state.base, filepath);
          }
 
          snode = OSLShaderManager::osl_node(graph, manager, filepath, "");
 
          if (!snode) {
            fprintf(stderr, "Failed to create OSL node from \"%s\".\n", filepath.c_str());
            continue;
          }
        }
        else {
          fprintf(stderr, "OSL node missing \"src\" attribute.\n");
          continue;
        }
      }
      else {
        fprintf(stderr, "OSL node without using --shadingsys osl.\n");
        continue;
      }
    }
    else
#endif
    {
      /* exception for name collision */
      if (node_name == "background")
        node_name = "background_shader";
 
      const NodeType *node_type = NodeType::find(node_name);
 
      if (!node_type) {
        fprintf(stderr, "Unknown shader node \"%s\".\n", node.name());
        continue;
      }
      else if (node_type->type != NodeType::SHADER) {
        fprintf(stderr, "Node type \"%s\" is not a shader node.\n", node_type->name.c_str());
        continue;
      }
      else if (node_type->create == NULL) {
        fprintf(stderr, "Can't create abstract node type \"%s\".\n", node_type->name.c_str());
        continue;
      }
 
      snode = (ShaderNode *)node_type->create(node_type);
    }
 
    xml_read_node(graph_reader, snode, node);
 
    if (node_name == "image_texture") {
      ImageTextureNode *img = (ImageTextureNode *)snode;
      ustring filename(path_join(state.base, img->get_filename().string()));
      img->set_filename(filename);
    }
    else if (node_name == "environment_texture") {
      EnvironmentTextureNode *env = (EnvironmentTextureNode *)snode;
      ustring filename(path_join(state.base, env->get_filename().string()));
      env->set_filename(filename);
    }
 
    if (snode) {
      /* add to graph */
      graph->add(snode);
    }
  }
 
  shader->set_graph(graph);
  shader->tag_update(state.scene);
}
 
static void xml_read_shader(XMLReadState &state, xml_node node)
{
  Shader *shader = new Shader();
  xml_read_shader_graph(state, shader, node);
  state.scene->shaders.push_back(shader);
}
 
/* Background */
 
static void xml_read_background(XMLReadState &state, xml_node node)
{
  /* Background Settings */
  xml_read_node(state, state.scene->background, node);
 
  /* Background Shader */
  Shader *shader = state.scene->default_background;
  xml_read_shader_graph(state, shader, node);
}
 
/* Mesh */
 
static Mesh *xml_add_mesh(Scene *scene, const Transform &tfm)
{
  /* create mesh */
  Mesh *mesh = new Mesh();
  scene->geometry.push_back(mesh);
 
  /* create object*/
  Object *object = new Object();
  object->set_geometry(mesh);
  object->set_tfm(tfm);
  scene->objects.push_back(object);
 
  return mesh;
}
 
static void xml_read_mesh(const XMLReadState &state, xml_node node)
{
  /* add mesh */
  Mesh *mesh = xml_add_mesh(state.scene, state.tfm);
  array<Node *> used_shaders = mesh->get_used_shaders();
  used_shaders.push_back_slow(state.shader);
  mesh->set_used_shaders(used_shaders);
 
  /* read state */
  int shader = 0;
  bool smooth = state.smooth;
 
  /* read vertices and polygons */
  vector<float3> P;
  vector<float> UV;
  vector<int> verts, nverts;
 
  xml_read_float3_array(P, node, "P");
  xml_read_int_array(verts, node, "verts");
  xml_read_int_array(nverts, node, "nverts");
 
  if (xml_equal_string(node, "subdivision", "catmull-clark")) {
    mesh->set_subdivision_type(Mesh::SUBDIVISION_CATMULL_CLARK);
  }
  else if (xml_equal_string(node, "subdivision", "linear")) {
    mesh->set_subdivision_type(Mesh::SUBDIVISION_LINEAR);
  }
 
  array<float3> P_array;
  P_array = P;
 
  if (mesh->get_subdivision_type() == Mesh::SUBDIVISION_NONE) {
    /* create vertices */
 
    mesh->set_verts(P_array);
 
    size_t num_triangles = 0;
    for (size_t i = 0; i < nverts.size(); i++)
      num_triangles += nverts[i] - 2;
    mesh->reserve_mesh(mesh->get_verts().size(), num_triangles);
 
    /* create triangles */
    int index_offset = 0;
 
    for (size_t i = 0; i < nverts.size(); i++) {
      for (int j = 0; j < nverts[i] - 2; j++) {
        int v0 = verts[index_offset];
        int v1 = verts[index_offset + j + 1];
        int v2 = verts[index_offset + j + 2];
 
        assert(v0 < (int)P.size());
        assert(v1 < (int)P.size());
        assert(v2 < (int)P.size());
 
        mesh->add_triangle(v0, v1, v2, shader, smooth);
      }
 
      index_offset += nverts[i];
    }
 
    if (xml_read_float_array(UV, node, "UV")) {
      ustring name = ustring("UVMap");
      Attribute *attr = mesh->attributes.add(ATTR_STD_UV, name);
      float2 *fdata = attr->data_float2();
 
      /* loop over the triangles */
      index_offset = 0;
      for (size_t i = 0; i < nverts.size(); i++) {
        for (int j = 0; j < nverts[i] - 2; j++) {
          int v0 = index_offset;
          int v1 = index_offset + j + 1;
          int v2 = index_offset + j + 2;
 
          assert(v0 * 2 + 1 < (int)UV.size());
          assert(v1 * 2 + 1 < (int)UV.size());
          assert(v2 * 2 + 1 < (int)UV.size());
 
          fdata[0] = make_float2(UV[v0 * 2], UV[v0 * 2 + 1]);
          fdata[1] = make_float2(UV[v1 * 2], UV[v1 * 2 + 1]);
          fdata[2] = make_float2(UV[v2 * 2], UV[v2 * 2 + 1]);
          fdata += 3;
        }
 
        index_offset += nverts[i];
      }
    }
  }
  else {
    /* create vertices */
    mesh->set_verts(P_array);
 
    size_t num_ngons = 0;
    size_t num_corners = 0;
    for (size_t i = 0; i < nverts.size(); i++) {
      num_ngons += (nverts[i] == 4) ? 0 : 1;
      num_corners += nverts[i];
    }
    mesh->reserve_subd_faces(nverts.size(), num_ngons, num_corners);
 
    /* create subd_faces */
    int index_offset = 0;
 
    for (size_t i = 0; i < nverts.size(); i++) {
      mesh->add_subd_face(&verts[index_offset], nverts[i], shader, smooth);
      index_offset += nverts[i];
    }
 
    /* uv map */
    if (xml_read_float_array(UV, node, "UV")) {
      ustring name = ustring("UVMap");
      Attribute *attr = mesh->subd_attributes.add(ATTR_STD_UV, name);
      float3 *fdata = attr->data_float3();
 
#if 0
      if (subdivide_uvs) {
        attr->flags |= ATTR_SUBDIVIDED;
      }
#endif
 
      index_offset = 0;
      for (size_t i = 0; i < nverts.size(); i++) {
        for (int j = 0; j < nverts[i]; j++) {
          *(fdata++) = make_float3(UV[index_offset++]);
        }
      }
    }
 
    /* setup subd params */
    float dicing_rate = state.dicing_rate;
    xml_read_float(&dicing_rate, node, "dicing_rate");
    dicing_rate = std::max(0.1f, dicing_rate);
 
    mesh->set_subd_dicing_rate(dicing_rate);
    mesh->set_subd_objecttoworld(state.tfm);
  }
 
  /* we don't yet support arbitrary attributes, for now add vertex
   * coordinates as generated coordinates if requested */
  if (mesh->need_attribute(state.scene, ATTR_STD_GENERATED)) {
    Attribute *attr = mesh->attributes.add(ATTR_STD_GENERATED);
    memcpy(
        attr->data_float3(), mesh->get_verts().data(), sizeof(float3) * mesh->get_verts().size());
  }
}
 
/* Light */
 
static void xml_read_light(XMLReadState &state, xml_node node)
{
  Light *light = new Light();
 
  light->set_shader(state.shader);
  xml_read_node(state, light, node);
 
  state.scene->lights.push_back(light);
}
 
/* Transform */
 
static void xml_read_transform(xml_node node, Transform &tfm)
{
  if (node.attribute("matrix")) {
    vector<float> matrix;
    if (xml_read_float_array(matrix, node, "matrix") && matrix.size() == 16) {
      ProjectionTransform projection = *(ProjectionTransform *)&matrix[0];
      tfm = tfm * projection_to_transform(projection_transpose(projection));
    }
  }
 
  if (node.attribute("translate")) {
    float3 translate = zero_float3();
    xml_read_float3(&translate, node, "translate");
    tfm = tfm * transform_translate(translate);
  }
 
  if (node.attribute("rotate")) {
    float4 rotate = zero_float4();
    xml_read_float4(&rotate, node, "rotate");
    tfm = tfm * transform_rotate(DEG2RADF(rotate.x), make_float3(rotate.y, rotate.z, rotate.w));
  }
 
  if (node.attribute("scale")) {
    float3 scale = zero_float3();
    xml_read_float3(&scale, node, "scale");
    tfm = tfm * transform_scale(scale);
  }
}
 
/* State */
 
static void xml_read_state(XMLReadState &state, xml_node node)
{
  /* read shader */
  string shadername;
 
  if (xml_read_string(&shadername, node, "shader")) {
    bool found = false;
 
    foreach (Shader *shader, state.scene->shaders) {
      if (shader->name == shadername) {
        state.shader = shader;
        found = true;
        break;
      }
    }
 
    if (!found)
      fprintf(stderr, "Unknown shader \"%s\".\n", shadername.c_str());
  }
 
  xml_read_float(&state.dicing_rate, node, "dicing_rate");
 
  /* read smooth/flat */
  if (xml_equal_string(node, "interpolation", "smooth"))
    state.smooth = true;
  else if (xml_equal_string(node, "interpolation", "flat"))
    state.smooth = false;
}
 
/* Scene */
 
static void xml_read_include(XMLReadState &state, const string &src);
 
static void xml_read_scene(XMLReadState &state, xml_node scene_node)
{
  for (xml_node node = scene_node.first_child(); node; node = node.next_sibling()) {
    if (string_iequals(node.name(), "film")) {
      xml_read_node(state, state.scene->film, node);
    }
    else if (string_iequals(node.name(), "integrator")) {
      xml_read_node(state, state.scene->integrator, node);
    }
    else if (string_iequals(node.name(), "camera")) {
      xml_read_camera(state, node);
    }
    else if (string_iequals(node.name(), "shader")) {
      xml_read_shader(state, node);
    }
    else if (string_iequals(node.name(), "background")) {
      xml_read_background(state, node);
    }
    else if (string_iequals(node.name(), "mesh")) {
      xml_read_mesh(state, node);
    }
    else if (string_iequals(node.name(), "light")) {
      xml_read_light(state, node);
    }
    else if (string_iequals(node.name(), "transform")) {
      XMLReadState substate = state;
 
      xml_read_transform(node, substate.tfm);
      xml_read_scene(substate, node);
    }
    else if (string_iequals(node.name(), "state")) {
      XMLReadState substate = state;
 
      xml_read_state(substate, node);
      xml_read_scene(substate, node);
    }
    else if (string_iequals(node.name(), "include")) {
      string src;
 
      if (xml_read_string(&src, node, "src"))
        xml_read_include(state, src);
    }
    else
      fprintf(stderr, "Unknown node \"%s\".\n", node.name());
  }
}
 
/* Include */
 
static void xml_read_include(XMLReadState &state, const string &src)
{
  /* open XML document */
  xml_document doc;
  xml_parse_result parse_result;
 
  string path = path_join(state.base, src);
  parse_result = doc.load_file(path.c_str());
 
  if (parse_result) {
    XMLReadState substate = state;
    substate.base = path_dirname(path);
 
    xml_node cycles = doc.child("cycles");
    xml_read_scene(substate, cycles);
  }
  else {
    fprintf(stderr, "%s read error: %s\n", src.c_str(), parse_result.description());
    exit(EXIT_FAILURE);
  }
}
 
/* File */
 
void xml_read_file(Scene *scene, const char *filepath)
{
  XMLReadState state;
 
  state.scene = scene;
  state.tfm = transform_identity();
  state.shader = scene->default_surface;
  state.smooth = false;
  state.dicing_rate = 1.0f;
  state.base = path_dirname(filepath);
 
  xml_read_include(state, path_filename(filepath));
 
  scene->params.bvh_type = SceneParams::BVH_STATIC;
}
 
CCL_NAMESPACE_END