/// <summary>
/// Counts the total number of vertices in a model section's vertex buffer.
/// </summary>
/// <param name="section">The section to count vertices for.</param>
/// <returns>The total number of vertices in the section's vertex buffer.</returns>
private static int CountVertices(IModelSection section)
{
int totalVertices = 0;
foreach (IModelSubmesh submesh in section.Submeshes)
totalVertices += submesh.VertexBufferCount;
return totalVertices;
}
/// <summary>
/// Skips over the extra per-vertex elements at the end of a vertex buffer.
/// </summary>
/// <param name="reader">The stream to seek.</param>
/// <param name="section">The current model section.</param>
public static void SkipExtraElements(IReader reader, IModelSection section)
{
int totalVertices = 0;
foreach (IModelSubmesh submesh in section.Submeshes)
{
totalVertices += submesh.VertexBufferCount;
}
switch (section.ExtraElementsType)
{
case ExtraVertexElementType.Byte:
reader.Skip((totalVertices * section.ExtraElementsPerVertex + 3) & ~3);
break;
case ExtraVertexElementType.Float3:
reader.Skip(totalVertices * section.ExtraElementsPerVertex * 3);
break;
case ExtraVertexElementType.None:
break;
default:
throw new InvalidOperationException("Unsupported extra vertex element type: " + section.ExtraElementsType);
}
}
/// <summary>
/// Counts the total number of vertices in a model section's vertex buffer.
/// </summary>
/// <param name="section">The section to count vertices for.</param>
/// <returns>The total number of vertices in the section's vertex buffer.</returns>
private static int CountVertices(IModelSection section)
{
int totalVertices = 0;
foreach (IModelSubmesh submesh in section.Submeshes)
{
totalVertices += submesh.VertexBufferCount;
}
return(totalVertices);
}
/// <summary>
/// Reads the index buffer for a section in a model.
/// </summary>
/// <param name="reader">The stream to read the index buffer from.</param>
/// <param name="section">The model section that the index buffer belongs to.</param>
/// <param name="buildInfo">Information about the cache file's target engine.</param>
/// <param name="processor">The IModelProcessor to pass the read model data to, or null if the index buffer should be skipped over.</param>
private static void ReadSectionIndices(IReader reader, IModelSection section, int baseIndex, BuildInformation buildInfo, IModelProcessor processor)
{
foreach (IModelSubmesh submesh in section.Submeshes)
{
if (processor != null)
{
ushort[] indices = IndexBufferReader.ReadIndexBuffer(reader, submesh.IndexBufferCount);
processor.ProcessSubmeshIndices(submesh, indices, baseIndex);
}
else
{
IndexBufferReader.SkipIndexBuffer(reader, submesh.IndexBufferCount);
}
}
reader.SeekTo((reader.Position + 3) & ~3); // Align 4
}
/// <summary>
/// Reads the index buffers for a model from a stream and passes them to an IModelProcessor.
/// </summary>
/// <param name="reader">The stream to read the index buffers from.</param>
/// <param name="model">The model's metadata.</param>
/// <param name="sectionsToRead">
/// A BitArray controlling which sections to read. Indices which are set to to true will be
/// read.
/// </param>
/// <param name="buildInfo">Information about the cache file's target engine.</param>
/// <param name="processor">The IModelProcessor to pass the read model data to.</param>
private static void ReadIndexBuffers(IReader reader, IRenderModel model, BitArray sectionsToRead,
EngineDescription buildInfo, IModelProcessor processor)
{
int baseIndex = 0;
for (int i = 0; i < model.Sections.Length; i++)
{
IModelSection section = model.Sections[i];
ReadSectionIndices(reader, section, baseIndex, buildInfo, sectionsToRead[i] ? processor : null);
if (sectionsToRead[i])
{
baseIndex += CountVertices(section);
}
}
}
/// <summary>
/// Reads the index buffer for a section in a model.
/// </summary>
/// <param name="reader">The stream to read the index buffer from.</param>
/// <param name="section">The model section that the index buffer belongs to.</param>
/// <param name="buildInfo">Information about the cache file's target engine.</param>
/// <param name="processor">
/// The IModelProcessor to pass the read model data to, or null if the index buffer should be
/// skipped over.
/// </param>
private static void ReadSectionIndices(IReader reader, IModelSection section, int baseIndex,
EngineDescription buildInfo, IModelProcessor processor)
{
foreach (IModelSubmesh submesh in section.Submeshes)
{
if (processor != null)
{
ushort[] indices = IndexBufferReader.ReadIndexBuffer(reader, submesh.IndexBufferCount);
processor.ProcessSubmeshIndices(submesh, indices, baseIndex);
}
else
{
IndexBufferReader.SkipIndexBuffer(reader, submesh.IndexBufferCount);
}
}
reader.SeekTo((reader.Position + 3) & ~3); // Align 4
}
/// <summary>
/// Reads the vertex buffer for a section in a model.
/// </summary>
/// <param name="reader">The stream to read the vertex buffer from.</param>
/// <param name="section">The model section that the vertex buffer belongs to.</param>
/// <param name="buildInfo">Information about the cache file's target engine.</param>
/// <param name="boundingBox">The bounding box for the model section.</param>
/// <param name="processor">
/// The IModelProcessor to pass the read model data to, or null if the vertex buffer should be
/// skipped over.
/// </param>
private static void ReadSectionVertices(IReader reader, IModelSection section, BoundingBox boundingBox,
EngineDescription buildInfo, IModelProcessor processor)
{
VertexLayout layout = buildInfo.VertexLayouts.GetLayout(section.VertexFormat);
foreach (IModelSubmesh submesh in section.Submeshes)
{
if (processor != null)
processor.BeginSubmeshVertices(submesh);
VertexBufferReader.ReadVertices(reader, layout, submesh.VertexBufferCount, boundingBox, processor);
if (processor != null)
processor.EndSubmeshVertices(submesh);
}
VertexBufferReader.SkipExtraElements(reader, section);
}
/// <summary>
/// Skips over the extra per-vertex elements at the end of a vertex buffer.
/// </summary>
/// <param name="reader">The stream to seek.</param>
/// <param name="section">The current model section.</param>
public static void SkipExtraElements(IReader reader, IModelSection section)
{
int totalVertices = 0;
foreach (IModelSubmesh submesh in section.Submeshes)
totalVertices += submesh.VertexBufferCount;
switch (section.ExtraElementsType)
{
case ExtraVertexElementType.Byte:
reader.Skip((totalVertices*section.ExtraElementsPerVertex + 3) & ~3);
break;
case ExtraVertexElementType.Float3:
reader.Skip(totalVertices*section.ExtraElementsPerVertex*3);
break;
case ExtraVertexElementType.None:
break;
default:
throw new InvalidOperationException("Unsupported extra vertex element type: " + section.ExtraElementsType);
}
}
/// <summary>
/// Reads the vertex buffer for a section in a model.
/// </summary>
/// <param name="reader">The stream to read the vertex buffer from.</param>
/// <param name="section">The model section that the vertex buffer belongs to.</param>
/// <param name="buildInfo">Information about the cache file's target engine.</param>
/// <param name="boundingBox">The bounding box for the model section.</param>
/// <param name="processor">
/// The IModelProcessor to pass the read model data to, or null if the vertex buffer should be
/// skipped over.
/// </param>
private static void ReadSectionVertices(IReader reader, IModelSection section, BoundingBox boundingBox,
EngineDescription buildInfo, IModelProcessor processor)
{
VertexLayout layout = buildInfo.VertexLayouts.GetLayout(section.VertexFormat);
foreach (IModelSubmesh submesh in section.Submeshes)
{
if (processor != null)
{
processor.BeginSubmeshVertices(submesh);
}
VertexBufferReader.ReadVertices(reader, layout, submesh.VertexBufferCount, boundingBox, processor);
if (processor != null)
{
processor.EndSubmeshVertices(submesh);
}
}
VertexBufferReader.SkipExtraElements(reader, section);
}
