/// <summary>
/// Add array of vertices to the combined mesh.
/// </summary>
/// <param name="vertices">Vertices array to add.</param>
/// <param name="indexes">Draw order / indexes array.</param>
/// <param name="material">Material to use with the vertices.</param>
public void AddVertices(VertexType[] vertices, ushort[] indexes, Materials.MaterialAPI material)
{
// sanity check - if build was called assert
if (_wasBuilt)
{
throw new Exceptions.InvalidActionException("Cannot add vertices to Combined Mesh Entity after it was built!");
}
// get the combined chunk to add these vertices to
CombinedMeshesPart combinedPart = GetCombinedPart(material);
// add vertices to combined part
combinedPart.Vertices.AddRange(vertices);
foreach (var vertex in vertices)
{
_allPoints.Add(GetPosition(vertex));
}
// set indexes
combinedPart.PushIndexes(indexes);
// increase index offset in combined part
combinedPart.IndexOffset += vertices.Length;
// update primitives count
combinedPart.PrimitiveCount += indexes.Length / 3;
}
/// <summary>
/// Get combined mesh part from material.
/// </summary>
/// <param name="material">Material to get combined part for.</param>
/// <returns>Combined mesh part.</returns>
private CombinedMeshesPart GetCombinedPart(Materials.MaterialAPI material)
{
// try to get from existing parts and if not found create it
CombinedMeshesPart combinedPart;
if (!_parts.TryGetValue(material, out combinedPart))
{
combinedPart = new CombinedMeshesPart();
_parts[material] = combinedPart;
}
// return combined part
return(combinedPart);
}
/// <summary>
/// Add a model mesh to the combined mesh.
/// </summary>
/// <param name="mesh">Mesh to add.</param>
/// <param name="transform">World transformations.</param>
/// <param name="material">Optional material to use instead of the mesh default materials.</param>
public void AddModelMesh(ModelMesh mesh, Matrix transform, Materials.MaterialAPI material = null)
{
// sanity check - if build was called assert
if (_wasBuilt)
{
throw new Exceptions.InvalidActionException("Cannot add meshes to Combined Mesh Entity after it was built!");
}
// did we get material override to set?
bool externalMaterial = material != null;
// iterate mesh parts
foreach (var meshPart in mesh.MeshParts)
{
// if we didn't get external material to use, get material from mesh part.
if (!externalMaterial)
{
material = meshPart.GetMaterial();
}
// get the combined chunk to add this meshpart to
CombinedMeshesPart combinedPart = GetCombinedPart(material);
// make sure its not readonly
if (meshPart.VertexBuffer.BufferUsage == BufferUsage.WriteOnly ||
meshPart.IndexBuffer.BufferUsage == BufferUsage.WriteOnly)
{
throw new Exceptions.InvalidValueException("Cannot add mesh with write-only buffers to Combined Mesh!");
}
// make sure vertex buffer uses position-normal-texture
if (meshPart.VertexBuffer.VertexDeclaration.VertexStride < 8)
{
throw new Exceptions.InvalidValueException("Combined meshes can only use vertex buffers with position, normal and texture!");
}
// get vertex buffer parameters
int vertexStride = meshPart.VertexBuffer.VertexDeclaration.VertexStride;
int vertexBufferSize = meshPart.NumVertices * vertexStride;
// get vertex data as float
float[] vertexData = new float[vertexBufferSize / sizeof(float)];
meshPart.VertexBuffer.GetData <float>(vertexData);
// iterate through vertices and add them
int verticesInPart = 0;
for (int i = 0; i < vertexBufferSize / sizeof(float); i += vertexStride / sizeof(float))
{
// get curr position with transformations
Vector3 currPosition = Vector3.Transform(new Vector3(vertexData[i], vertexData[i + 1], vertexData[i + 2]), transform);
// get other vertex properties based on type and add to vertices buffer
switch (_vtype)
{
case VertexTypes.VertexPosition:
{
// add to buffer
var vertexToAdd = new VertexPosition(currPosition);
combinedPart.Vertices.Add(ToVertexType(vertexToAdd));
break;
}
case VertexTypes.VertexPositionColor:
{
// get color
Color currColor = new Color(vertexData[i + 3], vertexData[i + 4], vertexData[i + 5], vertexData[i + 6]);
// add to buffer
var vertexToAdd = new VertexPositionColor(currPosition, currColor);
combinedPart.Vertices.Add(ToVertexType(vertexToAdd));
break;
}
case VertexTypes.VertexPositionNormalTexture:
{
// get normal
Vector3 normal = new Vector3(vertexData[i + 3], vertexData[i + 4], vertexData[i + 5]);
normal = Vector3.Normalize(Vector3.TransformNormal(normal, transform));
// get texture coords
Vector2 textcoords = new Vector2(vertexData[i + 6], vertexData[i + 7]);
// add to buffer
var vertexToAdd = new VertexPositionNormalTexture(currPosition, normal, textcoords);
combinedPart.Vertices.Add(ToVertexType(vertexToAdd));
break;
}
case VertexTypes.VertexPositionNormalTangentTexture:
{
// get normal
Vector3 normal = new Vector3(vertexData[i + 3], vertexData[i + 4], vertexData[i + 5]);
normal = Vector3.Normalize(Vector3.TransformNormal(normal, transform));
// get tangent
Vector3 tangent = new Vector3(vertexData[i + 6], vertexData[i + 7], vertexData[i + 8]);
// get binormal
Vector3 binormal = new Vector3(vertexData[i + 9], vertexData[i + 10], vertexData[i + 11]);
// get texture coords
Vector2 textcoords = new Vector2(vertexData[i + 12], vertexData[i + 13]);
// add to buffer
var vertexToAdd = new VertexPositionNormalTangentTexture(currPosition, normal, textcoords, tangent, binormal);
combinedPart.Vertices.Add(ToVertexType(vertexToAdd));
break;
}
case VertexTypes.VertexPositionTexture:
{
// get texture coords
Vector2 textcoords = new Vector2(vertexData[i + 3], vertexData[i + 4]);
// add to buffer
var vertexToAdd = new VertexPositionTexture(currPosition, textcoords);
combinedPart.Vertices.Add(ToVertexType(vertexToAdd));
break;
}
default:
throw new Exceptions.InternalError("Forgot to implement type support?");
}
// add to temp list of all points and increase vertices count
_allPoints.Add(currPosition);
verticesInPart++;
}
// set indexes
ushort[] drawOrder = new ushort[meshPart.IndexBuffer.IndexCount];
meshPart.IndexBuffer.GetData <ushort>(drawOrder);
combinedPart.PushIndexes(drawOrder);
// increase indexes offset
combinedPart.IndexOffset += verticesInPart;
// increase primitives count
combinedPart.PrimitiveCount += meshPart.PrimitiveCount;
}
}
