void processIndexData(IndexData* indexData)
{
if (!mFlipVertexWinding)
{
// Nothing to do.
return;
}
if (indexData->indexCount % 3 != 0)
{
printf("Index number is not a multiple of 3, no vertex winding flipping possible. Skipped.");
return;
}
//print("Flipping index order for vertex winding flipping.", V_HIGH);
Ogre::HardwareIndexBufferSharedPtr buffer = indexData->indexBuffer;
unsigned char* data = static_cast<unsigned char*>(buffer->lock(Ogre::HardwareBuffer::HBL_READ_ONLY));
if(buffer->getType() == Ogre::HardwareIndexBuffer::IT_16BIT)
{
// 16 bit
//print("using 16bit indices", V_HIGH);
for (size_t i = 0; i < indexData->indexCount; i+=3)
{
Ogre::uint16 * i0 = (Ogre::uint16*)(data+0 * buffer->getIndexSize());
Ogre::uint16* i2 = (Ogre::uint16*)(data+2 * buffer->getIndexSize());
// flip
Ogre::uint16 tmp = *i0;
*i0 = *i2;
*i2 = tmp;
data += 3 * buffer->getIndexSize();
}
}
else
{
// 32 bit
//print("using 32bit indices", V_HIGH);
for (size_t i = 0; i < indexData->indexCount; i+=3)
{
Ogre::uint32* i0 = (Ogre::uint32*)(data+0 * buffer->getIndexSize());
Ogre::uint32* i2 = (Ogre::uint32*)(data+2 * buffer->getIndexSize());
// flip
Ogre::uint32 tmp = *i0;
*i0 = *i2;
*i2 = tmp;
data += 3 * buffer->getIndexSize();
}
}
buffer->unlock();
}
void ChunkBase::generateMesh()
{
if (!mIsModified) return;
generateVertices();
if (isEmpty) {
return;
}
uint32_t numVertices, numIndices;
if (mNumVertices > DefaultFaces * 4) {
// more vertices than the default buffer can hold -> allocate new one;
if (mVertexBufferCreated) {
removeMesh();
}
numVertices = mNumVertices;
numIndices = mNumIndices;
} else {
numVertices = DefaultFaces * 4;
numIndices = DefaultFaces * 6;
}
if (!mVertexBufferCreated) {
mMeshPtr = Ogre::MeshManager::getSingleton().createManual(mChunkName, "Game");
Ogre::SubMesh* sub = mMeshPtr->createSubMesh();
/// Create vertex data structure for 8 vertices shared between submeshes
mMeshPtr->sharedVertexData = new Ogre::VertexData();
mMeshPtr->sharedVertexData->vertexCount = mNumVertices;
/// Create declaration (memory format) of vertex data
Ogre::VertexDeclaration* decl = mMeshPtr->sharedVertexData->vertexDeclaration;
size_t offset = 0;
// 1st buffer
decl->addElement(0, offset, Ogre::VET_FLOAT3, Ogre::VES_POSITION);
offset += Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT3);
decl->addElement(0, offset, Ogre::VET_FLOAT3, Ogre::VES_NORMAL);
offset += Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT3);
decl->addElement(0, offset, Ogre::VET_FLOAT2, Ogre::VES_TEXTURE_COORDINATES);
offset += Ogre::VertexElement::getTypeSize(Ogre::VET_FLOAT2);
/// Allocate vertex buffer of the requested number of vertices (vertexCount) and bytes per vertex (offset)
Ogre::HardwareVertexBufferSharedPtr vbuf = Ogre::HardwareBufferManager::getSingleton().
createVertexBuffer(offset, numVertices, Ogre::HardwareBuffer::HBU_DYNAMIC_WRITE_ONLY_DISCARDABLE);
/// Upload the vertex data to the card
vbuf->writeData(0, (decl->getVertexSize(0) * mNumVertices), mVertices, true);
/// Set vertex buffer binding so buffer 0 is bound to our vertex buffer
Ogre::VertexBufferBinding* bind = mMeshPtr->sharedVertexData->vertexBufferBinding;
bind->setBinding(0, vbuf);
/// Allocate index buffer of the requested number of vertices (ibufCount)
Ogre::HardwareIndexBufferSharedPtr ibuf = Ogre::HardwareBufferManager::getSingleton().
createIndexBuffer(Ogre::HardwareIndexBuffer::IT_16BIT, numIndices, Ogre::HardwareBuffer::HBU_DYNAMIC_WRITE_ONLY_DISCARDABLE);
/// Upload the index data to the card
ibuf->writeData(0, (ibuf->getIndexSize() * mNumIndices), mIndices, true);
/// Set parameters of the submesh
sub->indexData->indexBuffer = ibuf;
sub->indexData->indexCount = mNumIndices;
/// Set bounding information (for culling)
mMeshPtr->_setBounds(Ogre::AxisAlignedBox(0, 0, 0, Ogre::Real(ChunkSizeX), Ogre::Real(mHighestCube), Ogre::Real(ChunkSizeZ)));
mMeshPtr->_setBoundingSphereRadius((Ogre::Real) std::sqrt((float) (2 * 16 * 16 + 128 * 128)));
/// Notify -Mesh object that it has been loaded
mMeshPtr->load();
mVertexBufferCreated = true;
} else {
Ogre::VertexDeclaration* decl = mMeshPtr->sharedVertexData->vertexDeclaration;
mMeshPtr->sharedVertexData->vertexCount = mNumVertices;
Ogre::SubMesh* sub = mMeshPtr->getSubMesh(0);
sub->indexData->indexCount = mNumIndices;
/// Upload the new vertex data to the card
Ogre::HardwareVertexBufferSharedPtr vbuf = mMeshPtr->sharedVertexData->vertexBufferBinding->getBuffer(0);
vbuf->writeData(0, (decl->getVertexSize(0) * mNumVertices), mVertices, true);
/// Upload the index data to the card
Ogre::HardwareIndexBufferSharedPtr ibuf = sub->indexData->indexBuffer;
ibuf->writeData(0, (ibuf->getIndexSize() * mNumIndices), mIndices, true);
mMeshPtr->_setBounds(Ogre::AxisAlignedBox(0, 0, 0, Ogre::Real(ChunkSizeX), Ogre::Real(mHighestCube), Ogre::Real(ChunkSizeZ)));
mMeshPtr->load();
}
}