private Skin SendDataToGpu(string modelPath)
{
Skin resultSkin = null;
// Get mesh data
using (AssimpModelLoader loader = new AssimpModelLoader(modelPath))
{
VertexArrayObject vao = new VertexArrayObject();
MeshVertexData meshData = loader.GetMeshData();
// explicit null assignment if there is no some of mesh data
var vertices = meshData.Verts;
var normals = meshData.bHasNormals ? meshData.N_Verts : null;
var texCoords = meshData.T_Verts;
var tangents = meshData.bHasTangentVertices ? meshData.Tangent_Verts : meshData.bHasTextureCoordinates ? VectorMath.AdditionalVertexInfoCreator.CreateTangentVertices(vertices, texCoords) : null;
var bitangents = meshData.bHasTangentVertices ? meshData.Bitanget_Verts : meshData.bHasTextureCoordinates ? VectorMath.AdditionalVertexInfoCreator.CreateBitangentVertices(vertices, texCoords) : null;
var blendWeights = meshData.bHasAnimation ? meshData.BlendWeights : null;
var blendIndices = meshData.bHasAnimation ? meshData.BlendIndices : null;
UInt32[] indices = meshData.bHasIndices ? meshData.Indices.ToArray() : null;
IndexBufferObject ibo = null;
VertexBufferObjectTwoDimension <float> normalsVBO = null, texCoordsVBO = null, tangentsVBO = null, bitangentsVBO = null, blendWeightsVBO = null;
VertexBufferObjectTwoDimension <Int32> blendIndicesVBO = null;
if (meshData.bHasIndices)
{
ibo = new IndexBufferObject(indices);
}
VertexBufferObjectTwoDimension <float> vertexVBO = new VertexBufferObjectTwoDimension <float>(vertices, BufferTarget.ArrayBuffer, 0, 3, VertexBufferObjectBase.DataCarryFlag.Invalidate);
if (meshData.bHasNormals)
{
normalsVBO = new VertexBufferObjectTwoDimension <float>(normals, BufferTarget.ArrayBuffer, 1, 3, VertexBufferObjectBase.DataCarryFlag.Invalidate);
}
if (meshData.bHasTextureCoordinates)
{
texCoordsVBO = new VertexBufferObjectTwoDimension <float>(texCoords, BufferTarget.ArrayBuffer, 2, 2, VertexBufferObjectBase.DataCarryFlag.Invalidate);
}
if (meshData.bHasTangentVertices)
{
tangentsVBO = new VertexBufferObjectTwoDimension <float>(tangents, BufferTarget.ArrayBuffer, 4, 3, VertexBufferObjectBase.DataCarryFlag.Invalidate);
}
if (meshData.bHasTangentVertices)
{
bitangentsVBO = new VertexBufferObjectTwoDimension <float>(bitangents, BufferTarget.ArrayBuffer, 5, 3, VertexBufferObjectBase.DataCarryFlag.Invalidate);
}
if (meshData.bHasAnimation)
{
Int32 skeletonWeightsPerVertexCount = (Int32)loader.m_skeletonType;
if (skeletonWeightsPerVertexCount > 4)
{
throw new NotImplementedException("There is no implementation yet for cases when there are more than four weights influencing on vertex.");
}
Int32 vectorSize = skeletonWeightsPerVertexCount;
blendWeightsVBO = new VertexBufferObjectTwoDimension <float>(blendWeights, BufferTarget.ArrayBuffer, 6, vectorSize, VertexBufferObjectBase.DataCarryFlag.Invalidate);
blendIndicesVBO = new VertexBufferObjectTwoDimension <int>(blendIndices, BufferTarget.ArrayBuffer, 7, vectorSize, VertexBufferObjectBase.DataCarryFlag.Invalidate);
}
vao.AddVBO(vertexVBO, normalsVBO, texCoordsVBO, tangentsVBO, bitangentsVBO, blendWeightsVBO, blendIndicesVBO);
vao.AddIndexBuffer(ibo);
vao.BindBuffersToVao();
if (meshData.bHasAnimation)
{
ParentBone rootBone = AssimpConverter.Converter.ConvertAssimpBoneToEngineBone(meshData.SkeletonRoot);
resultSkin = new AnimatedSkin(vao, rootBone);
}
else
{
resultSkin = new Skin(vao);
}
}
return(resultSkin);
}