1 | #include "BBCOgreMeshSerializer.h"
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2 |
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3 | namespace BBC {
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4 |
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5 | UniqueVertex::UniqueVertex()
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6 | : position(Ogre::Vector3::ZERO), normal(Ogre::Vector3::ZERO), colour(0), nextIndex(0)
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7 | {
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8 | for (int i = 0; i < OGRE_MAX_TEXTURE_COORD_SETS; ++i)
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9 | uv[i] = Ogre::Vector3::ZERO;
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10 | }
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11 |
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12 | bool UniqueVertex::operator==(const UniqueVertex& rhs) const
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13 | {
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14 | bool ret = position == rhs.position &&
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15 | normal == rhs.normal &&
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16 | colour == rhs.colour;
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17 | if (!ret) return ret;
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18 |
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19 | for (int i = 0; i < OGRE_MAX_TEXTURE_COORD_SETS && ret; ++i)
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20 | {
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21 | ret = ret && (uv[i] == rhs.uv[i]);
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22 | }
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23 |
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24 | return ret;
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25 | }
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26 |
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27 | void OgreMeshSerializer::setEntity(EntityPtr entity)
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28 | {
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29 | mEntity = entity;
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30 | }
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31 |
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32 | EntityPtr OgreMeshSerializer::getEntity()
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33 | {
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34 | return mEntity;
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35 | }
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36 |
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37 | OgreMeshSerializer::OgreMeshSerializer()
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38 | {
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39 | }
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40 |
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41 | OgreMeshSerializer::~OgreMeshSerializer()
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42 | {
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43 | }
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44 |
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45 |
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46 | void OgreMeshSerializer::exportMesh(const Ogre::String& fileName, bool mergeSubMeshes = false, bool tangents = false)
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47 | {
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48 |
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49 | Ogre::LogManager::getSingleton().logMessage("** Begin OGRE Mesh Export **");
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50 | // Derive the scene root
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51 |
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52 | // Construct mesh
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53 | BBC::MeshPtr pMesh(new BBC::Mesh(Ogre::MeshManager::getSingleton().createManual(fileName, fileName).getPointer()));
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54 |
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55 | Ogre::MeshPtr mesh = Ogre::MeshManager::getSingleton().load(fileName, fileName);
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56 |
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57 | Ogre::LogManager::getSingleton().logMessage("Num.SubEntities:" + Ogre::StringConverter::toString(mEntity->getNumSubEntities()));
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58 |
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59 | mEntity->setMesh(pMesh);
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60 |
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61 | // write the data into a mesh
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62 | buildMesh(pMesh, mergeSubMeshes);
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63 |
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64 | if(tangents)
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65 | {
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66 | Ogre::LogManager::getSingleton().logMessage("Calculating tangents");
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67 | unsigned short src, dest;
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68 | if (pMesh->get()->suggestTangentVectorBuildParams(src, dest))
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69 | {
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70 | pMesh->get()->buildTangentVectors(src, dest);
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71 | }
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72 | else
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73 | {
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74 | Ogre::LogManager::getSingleton().logMessage("Could not derive tangents parameters");
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75 | }
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76 | }
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77 |
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78 | Ogre::LogManager::getSingleton().logMessage("** OGRE Mesh Export Complete **");
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79 | }
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80 |
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81 | void OgreMeshSerializer::buildMesh(MeshPtr pMesh, bool mergeSubmeshes)
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82 | {
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83 | if (!mergeSubmeshes)
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84 | {
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85 | // build contents of this polymesh into ProtoSubMesh(es)
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86 | generateEntityAABB(pMesh);
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87 |
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88 | // export out at the end of every PolygonMesh
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89 | exportSubMeshes(pMesh);
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90 | }
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91 | // TODO
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92 | if (mergeSubmeshes)
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93 | {
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94 | // build contents of this polymesh into ProtoSubMesh(es)
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95 | mEntity->mergeSubEntities();
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96 |
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97 | generateEntityAABB(pMesh);
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98 |
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99 | // export out the combined result
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100 | exportSubMeshes(pMesh);
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101 | }
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102 | }
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103 |
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104 | void OgreMeshSerializer::generateEntityAABB(MeshPtr pMesh)
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105 | {
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106 | // Bounds calculation
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107 | Ogre::Real squaredRadius = 0.0f;
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108 | Ogre::Vector3 min, max;
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109 | bool first = true;
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110 |
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111 | for (unsigned int iSubEntity = 0; iSubEntity < mEntity->getNumSubEntities(); iSubEntity++)
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112 | {
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113 | for (size_t jVertex = 0; jVertex < mEntity->getSubEntity(iSubEntity)->getNumVertices(); jVertex++)
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114 | {
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115 | if (first)
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116 | {
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117 | squaredRadius = mEntity->getSubEntity(iSubEntity)->getUniqueVertex(jVertex).position.squaredLength();
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118 | min = max = mEntity->getSubEntity(iSubEntity)->getUniqueVertex(jVertex).position;
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119 | first = false;
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120 | }
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121 | else
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122 | {
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123 | size_t numVertices = (unsigned int)mEntity->getSubEntity(iSubEntity)->getNumVertices();
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124 | //Ogre::LogManager::getSingleton().logMessage("NumVertices:" + Ogre::StringConverter::toString(numVertices));
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125 | //Ogre::LogManager::getSingleton().logMessage("IDVertex:" + Ogre::StringConverter::toString(jVertex) + "--" + Ogre::StringConverter::toString(iSubEntity) + "--" + Ogre::StringConverter::toString(mEntity->getSubEntity(iSubEntity)->getUniqueVertex(jVertex).position));
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126 | squaredRadius =
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127 | std::max(squaredRadius,mEntity->getSubEntity(iSubEntity)->getUniqueVertex(jVertex).position.squaredLength());
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128 | min.makeFloor(mEntity->getSubEntity(iSubEntity)->getUniqueVertex(jVertex).position);
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129 | max.makeCeil(mEntity->getSubEntity(iSubEntity)->getUniqueVertex(jVertex).position);
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130 | }
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131 | }
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132 | }
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133 |
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134 | // Merge bounds
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135 | Ogre::AxisAlignedBox box;
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136 | box.setExtents(min, max);
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137 | box.merge(pMesh->get()->getBounds());
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138 | pMesh->get()->_setBounds(box);
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139 | pMesh->get()->_setBoundingSphereRadius(
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140 | std::max(
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141 | pMesh->get()->getBoundingSphereRadius(),
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142 | Ogre::Math::Sqrt(squaredRadius)));
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143 |
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144 | Ogre::LogManager::getSingleton().logMessage("Bounds:" + Ogre::StringConverter::toString(pMesh->get()->getBoundingSphereRadius()) + " -- Generated:" + Ogre::StringConverter::toString(pMesh->get()->getBounds().isNull()));
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145 | }
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146 |
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147 | void OgreMeshSerializer::exportSubMeshes(MeshPtr pMesh)
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148 | {
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149 | for (unsigned int iSubEntity = 0; iSubEntity < mEntity->getNumSubEntities(); iSubEntity++)
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150 | {
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151 | exportSubMesh(pMesh,mEntity->getSubEntity(iSubEntity));
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152 | }
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153 | }
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154 |
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155 | void OgreMeshSerializer::exportSubMesh(MeshPtr pMesh, SubEntityPtr subEntity)
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156 | {
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157 | Ogre::SubMesh* sm = 0;
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158 | if (subEntity->getName() == "")
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159 | {
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160 | sm = pMesh->get()->createSubMesh();
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161 | }
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162 | else
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163 | {
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164 | sm = pMesh->get()->createSubMesh(subEntity->getName());
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165 | }
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166 | // Set material
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167 | sm->setMaterialName(subEntity->getMaterialName());
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168 | // never use shared geometry
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169 | sm->useSharedVertices = false;
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170 | sm->vertexData = new Ogre::VertexData();
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171 | // always do triangle list
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172 | sm->indexData->indexCount = subEntity->getNumFaces()*3;
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173 |
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174 | sm->vertexData->vertexCount = subEntity->getNumVertices();
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175 | // Determine index size
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176 | bool use32BitIndexes = false;
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177 | if (subEntity->getNumVertices() > 65536)
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178 | {
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179 | use32BitIndexes = true;
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180 | }
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181 |
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182 | sm->indexData->indexBuffer =
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183 | Ogre::HardwareBufferManager::getSingleton().createIndexBuffer(
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184 | use32BitIndexes ? Ogre::HardwareIndexBuffer::IT_32BIT : Ogre::HardwareIndexBuffer::IT_16BIT,
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185 | sm->indexData->indexCount,
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186 | Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY);
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187 |
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188 | if (use32BitIndexes)
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189 | {
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190 | unsigned int* pIdx = static_cast<unsigned int*>(
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191 | sm->indexData->indexBuffer->lock(Ogre::HardwareBuffer::HBL_DISCARD));
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192 | writeIndexes(pIdx,subEntity);
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193 | sm->indexData->indexBuffer->unlock();
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194 | }
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195 | else
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196 | {
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197 | unsigned short int* pIdx = static_cast<unsigned short int*>(
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198 | sm->indexData->indexBuffer->lock(Ogre::HardwareBuffer::HBL_DISCARD));
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199 | writeIndexes(pIdx,subEntity);
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200 | sm->indexData->indexBuffer->unlock();
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201 | }
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202 |
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203 |
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204 | // define vertex declaration
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205 | unsigned buf = 0;
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206 | size_t offset = 0;
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207 | // always add position and normal
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208 | sm->vertexData->vertexDeclaration->addElement(buf, offset, Ogre::VET_FLOAT3, Ogre::VES_POSITION);
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209 | offset += Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT3);
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210 | sm->vertexData->vertexDeclaration->addElement(buf, offset, Ogre::VET_FLOAT3, Ogre::VES_NORMAL);
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211 | offset += Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT3);
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212 |
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213 | // Optional vertex colour
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214 | if(subEntity->hasVertexColors())
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215 | {
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216 | sm->vertexData->vertexDeclaration->addElement(buf, offset, Ogre::VET_COLOUR, Ogre::VES_DIFFUSE);
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217 | offset += Ogre::VertexElement::getTypeSize(Ogre::VET_COLOUR);
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218 | }
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219 |
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220 | // Define UVs
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221 | for (unsigned short uvi = 0; uvi < subEntity->getNumTexCoordSets(); uvi++)
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222 | {
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223 | Ogre::VertexElementType uvType = Ogre::VertexElement::multiplyTypeCount(Ogre::VET_FLOAT1, subEntity->getTexCoordDimensions(uvi));
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224 | sm->vertexData->vertexDeclaration->addElement(buf, offset, uvType, Ogre::VES_TEXTURE_COORDINATES, uvi);
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225 | offset += Ogre::VertexElement::getTypeSize(uvType);
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226 | }
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227 |
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228 | // create & fill buffer(s)
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229 | for (unsigned short b = 0; b <= sm->vertexData->vertexDeclaration->getMaxSource(); ++b)
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230 | {
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231 | createVertexBuffer(sm->vertexData, b, subEntity->getUniqueVertices());
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232 | }
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233 | }
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234 |
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235 | template <typename T>
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236 | void OgreMeshSerializer::writeIndexes(T* buf, SubEntityPtr subEntity)
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237 | {
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238 | for (unsigned int i = 0; i < subEntity->getNumFaces(); i++)
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239 | {
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240 | Ogre::Vector3 indexes = subEntity->getFaceVerticesIDs(i);
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241 | unsigned int i0, i1, i2;
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242 | i0 = (unsigned int)indexes[0];
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243 | i1 = (unsigned int)indexes[1];
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244 | i2 = (unsigned int)indexes[2];
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245 | *buf++ = static_cast<T>(i0);
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246 | *buf++ = static_cast<T>(i1);
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247 | *buf++ = static_cast<T>(i2);
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248 | }
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249 | }
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250 |
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251 | void OgreMeshSerializer::createVertexBuffer(Ogre::VertexData* vd,
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252 | unsigned short bufIdx, UniqueVertexList *uniqueVertexList)
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253 | {
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254 | Ogre::HardwareVertexBufferSharedPtr vbuf =
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255 | Ogre::HardwareBufferManager::getSingleton().createVertexBuffer(
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256 | vd->vertexDeclaration->getVertexSize(bufIdx),
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257 | vd->vertexCount,
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258 | Ogre::HardwareBuffer::HBU_STATIC_WRITE_ONLY);
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259 | vd->vertexBufferBinding->setBinding(bufIdx, vbuf);
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260 | size_t vertexSize = vd->vertexDeclaration->getVertexSize(bufIdx);
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261 |
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262 | char* pBase = static_cast<char*>(
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263 | vbuf->lock(Ogre::HardwareBuffer::HBL_DISCARD));
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264 |
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265 | Ogre::VertexDeclaration::VertexElementList elems =
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266 | vd->vertexDeclaration->findElementsBySource(bufIdx);
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267 | Ogre::VertexDeclaration::VertexElementList::iterator ei, eiend;
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268 | eiend = elems.end();
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269 | float* pFloat;
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270 | Ogre::RGBA* pRGBA;
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271 |
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272 | UniqueVertexList::iterator srci = uniqueVertexList->begin();
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273 |
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274 | for (size_t v = 0; v < vd->vertexCount; ++v, ++srci)
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275 | {
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276 | for (ei = elems.begin(); ei != eiend; ++ei)
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277 | {
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278 | Ogre::VertexElement& elem = *ei;
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279 | switch(elem.getSemantic())
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280 | {
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281 | case Ogre::VES_POSITION:
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282 | elem.baseVertexPointerToElement(pBase, &pFloat);
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283 | *pFloat++ = srci->position.x;
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284 | *pFloat++ = srci->position.y;
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285 | *pFloat++ = srci->position.z;
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286 | break;
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287 | case Ogre::VES_NORMAL:
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288 | elem.baseVertexPointerToElement(pBase, &pFloat);
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289 | *pFloat++ = srci->normal.x;
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290 | *pFloat++ = srci->normal.y;
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291 | *pFloat++ = srci->normal.z;
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292 | break;
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293 | case Ogre::VES_DIFFUSE:
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294 | elem.baseVertexPointerToElement(pBase, &pRGBA);
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295 | *pRGBA = srci->colour;
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296 | break;
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297 | case Ogre::VES_TEXTURE_COORDINATES:
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298 | elem.baseVertexPointerToElement(pBase, &pFloat);
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299 | for (int t = 0; t < Ogre::VertexElement::getTypeCount(elem.getType()); ++t)
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300 | {
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301 | Ogre::Real val = srci->uv[elem.getIndex()][t];
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302 | *pFloat++ = val;
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303 | }
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304 | break;
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305 | }
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306 | }
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307 | pBase += vertexSize;
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308 | }
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309 | vbuf->unlock();
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310 |
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311 | }
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312 |
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313 | }
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