/// <summary>
/// Builds vertex and index buffers.
/// </summary>
/// <param name="device">The device on which to build all buffers.</param>
/// <param name="structures">All structure to be loaded.</param>
/// <param name="resources">The current resource dictionary</param>
protected virtual LoadedStructureInfo[] BuildBuffers(EngineDevice device, VertexStructure[] structures, ResourceDictionary resources)
{
List <LoadedStructureInfo> result = new List <LoadedStructureInfo>(structures.Length * 2);
List <StandardVertex[]> cachedVertices = new List <StandardVertex[]>(2);
List <int[]> cachedIndices = new List <int[]>(6);
int structuresCount = structures.Length;
int actVertexCount = 0;
int actIndexCount = 0;
int lastFinishedVertexBufferResultIndex = -1;
int lastFinishedIndexBufferResultIndex = -1;
int vertexBufferID = 0;
int indexBufferID = 0;
// Define the action which finishes current index buffer
Action actionFinishIndexBuffer = () =>
{
// Create the vertex buffer
D3D11.Buffer indexBuffer = GraphicsHelper.CreateImmutableIndexBuffer(
device,
cachedIndices.ToArray());
cachedIndices.Clear();
actIndexCount = 0;
indexBufferID++;
// Do also create index buffer
for (int loop = lastFinishedIndexBufferResultIndex + 1; loop < result.Count; loop++)
{
result[loop].IndexBuffer = indexBuffer;
}
lastFinishedIndexBufferResultIndex = result.Count - 1;
};
// Define the action which finishes current vertex buffer
Action actionFinishVertexBuffer = () =>
{
// Create the vertex buffer
D3D11.Buffer vertexBuffer = GraphicsHelper.CreateImmutableVertexBuffer(
device,
cachedVertices.ToArray());
cachedVertices.Clear();
actVertexCount = 0;
vertexBufferID++;
// Do also finish index buffers in this case
actionFinishIndexBuffer();
// Do also create index buffer
for (int loop = lastFinishedVertexBufferResultIndex + 1; loop < result.Count; loop++)
{
result[loop].VertexBuffer = vertexBuffer;
}
lastFinishedVertexBufferResultIndex = result.Count - 1;
};
// Load all structures into memory within a loop
for (int loopStruct = 0; loopStruct < structuresCount; loopStruct++)
{
VertexStructure actStructure = structures[loopStruct];
if (actStructure.CountVertices == 0)
{
continue;
}
if (actStructure.CountSurfaces == 0)
{
continue;
}
// Handle vertex data
StandardVertex[] vertexArray = StandardVertex.FromVertexStructure(actStructure);
if (actVertexCount + vertexArray.Length > MAX_VERTEX_COUNT_PER_BUFFER)
{
actionFinishVertexBuffer();
}
cachedVertices.Add(vertexArray);
int actBaseVertex = actVertexCount;
actVertexCount += vertexArray.Length;
// Sort all surfaces by material
List <VertexStructureSurface> surfaceList = new List <VertexStructureSurface>(actStructure.Surfaces);
surfaceList.Sort((left, right) => left.MaterialProperties.GetHashCode().CompareTo(right.MaterialProperties.GetHashCode()));
int surfaceCount = surfaceList.Count;
for (int loopSurface = 0; loopSurface < surfaceCount; loopSurface++)
{
VertexStructureSurface actSurface = surfaceList[loopSurface];
if (actSurface.CountTriangles == 0)
{
continue;
}
// Handle index data
int[] indexArray = actSurface.GetIndexArray();
if (actBaseVertex > 0)
{
for (int loopIndex = 0; loopIndex < indexArray.Length; loopIndex++)
{
indexArray[loopIndex] = indexArray[loopIndex] + actBaseVertex;
}
}
if (actIndexCount + indexArray.Length > MAX_INDEX_COUNT_PER_BUFFER)
{
actionFinishIndexBuffer();
}
cachedIndices.Add(indexArray);
actIndexCount += indexArray.Length;
// Get or create the material
LoadedStructureInfo lastStructureInfo = result.Count > 0 ? result[result.Count - 1] : null;
if ((lastStructureInfo != null) &&
(lastStructureInfo.IndexBuffer == null) &&
(actSurface.MaterialProperties.Equals(lastStructureInfo.MaterialProperties)))
{
LoadedStructureInfo actStructureInfo = result[result.Count - 1];
actStructureInfo.IndexCount = actStructureInfo.IndexCount + indexArray.Length;
}
else
{
MaterialResource actMaterialResource = resources.GetOrCreateMaterialResourceAndEnsureLoaded(actSurface);
// Create some information about the loaded structures
LoadedStructureInfo newStructureInfo = new LoadedStructureInfo();
newStructureInfo.VertexBufferID = vertexBufferID;
newStructureInfo.IndexBufferID = indexBufferID;
newStructureInfo.SizePerVertex = StandardVertex.Size;
newStructureInfo.VertexStructure = actStructure;
newStructureInfo.IndexCount = indexArray.Length;
newStructureInfo.StartIndex = actIndexCount - indexArray.Length;
newStructureInfo.Material = actMaterialResource;
newStructureInfo.MaterialProperties = actSurface.MaterialProperties;
newStructureInfo.VertexBuffer = null;
newStructureInfo.IndexBuffer = null;
newStructureInfo.InputLayout = newStructureInfo.Material.GenerateInputLayout(
device, StandardVertex.InputElements, MaterialApplyInstancingMode.SingleObject);
result.Add(newStructureInfo);
}
}
}
// Finish all remaining buffers finally
if (cachedVertices.Count > 0)
{
actionFinishVertexBuffer();
}
if (cachedIndices.Count > 0)
{
actionFinishIndexBuffer();
}
return(result.ToArray());
}