private static void initData(SoftwareMesh softwareMesh, bool loadColors, bool loadUVs, bool loadNormals, out List<BufferLayoutElement> elements, out float[] vertices, out int[] indices)
{
// get position float size
int posFloatCount = 0;
var posElementType = BufferLayoutElementTypes.Vector3;
switch (softwareMesh.Dimensions)
{
case 2:
posElementType = BufferLayoutElementTypes.Vector2;
posFloatCount = 2;
break;
case 3:
posElementType = BufferLayoutElementTypes.Vector3;
posFloatCount = 3;
break;
}
// get vertex float size and create layout
elements = new List<BufferLayoutElement>();
int vertFloatCount = 0, posCount = 0, colorCount = 0, normalCount = 0, uvCount = 0;
foreach (var key in softwareMesh.VertexComponentKeys)
{
switch (key.Key)
{
case VertexComponentKeyTypes.Positions:
elements.Add(new BufferLayoutElement(posElementType, BufferLayoutElementUsages.Position, 0, posCount, vertFloatCount));
vertFloatCount += posFloatCount;
++posCount;
break;
}
}
foreach (var key in softwareMesh.TriangleComponentKeys)
{
switch (key.Key)
{
case TriangleComponentKeyTypes.ColorComponents:
if (loadColors)
{
elements.Add(new BufferLayoutElement(BufferLayoutElementTypes.Vector4, BufferLayoutElementUsages.Color, 0, colorCount, vertFloatCount));
vertFloatCount += 4;
++colorCount;
}
break;
case TriangleComponentKeyTypes.NormalComponents:
if (loadNormals)
{
elements.Add(new BufferLayoutElement(BufferLayoutElementTypes.Vector3, BufferLayoutElementUsages.Normal, 0, normalCount, vertFloatCount));
vertFloatCount += 3;
++normalCount;
}
break;
case TriangleComponentKeyTypes.UVComponents:
if (loadUVs)
{
elements.Add(new BufferLayoutElement(BufferLayoutElementTypes.Vector2, BufferLayoutElementUsages.UV, 0, uvCount, vertFloatCount));
vertFloatCount += 2;
++uvCount;
}
break;
}
}
// create vertex buffer
var meshProcessor = new HardwareMeshProcessor(softwareMesh, loadColors, loadUVs, loadNormals);
vertices = new float[meshProcessor.Verticies.Count * vertFloatCount];
int vi = 0;
foreach (var vertex in meshProcessor.Verticies)
{
int posIndex = 0, colorIndex = 0, normIndex = 0, uvIndex = 0;
foreach (var element in elements)
{
switch (element.Usage)
{
case BufferLayoutElementUsages.Position:
vertices[vi] = vertex.Positions[posIndex].X;
vertices[vi+1] = vertex.Positions[posIndex].Y;
if (posFloatCount == 3) vertices[vi+2] = vertex.Positions[posIndex].Z;
vi += posFloatCount;
++posIndex;
break;
case BufferLayoutElementUsages.Color:
if (loadColors)
{
vertices[vi] = vertex.Colors[uvIndex].X;
vertices[vi+1] = vertex.Colors[uvIndex].Y;
vi += 4;
++colorIndex;
}
break;
case BufferLayoutElementUsages.Normal:
if (loadNormals)
{
vertices[vi] = vertex.Normals[normIndex].X;
vertices[vi+1] = vertex.Normals[normIndex].Y;
vertices[vi+2] = vertex.Normals[normIndex].Z;
vi += 3;
++normIndex;
}
break;
case BufferLayoutElementUsages.UV:
if (loadUVs)
{
vertices[vi] = vertex.UVs[uvIndex].X;
vertices[vi+1] = vertex.UVs[uvIndex].Y;
vi += 2;
++uvIndex;
}
break;
}
}
}
// create index buffer
indices = new int[meshProcessor.Triangles.Count * 3];
int ti = 0;
foreach (var triangle in meshProcessor.Triangles)
{
indices[ti] = triangle.Verticies[0].Index;
indices[ti+1] = triangle.Verticies[1].Index;
indices[ti+2] = triangle.Verticies[2].Index;
ti += 3;
}
}
public HardwareMeshProcessor(SoftwareMesh mesh, bool loadColors, bool loadUVs, bool loadNormals)
{
this.mesh = mesh;
// get vertex component types
positions = new List<Vector3[]>();
foreach (var key in mesh.VertexComponentKeys)
{
switch (key.Key)
{
case VertexComponentKeyTypes.Positions:
var vertexComponents = mesh.VetexComponents[key.Value];
if (vertexComponents.GetType() == typeof(Vector3[]))
{
positions.Add((Vector3[])vertexComponents);
}
else if (vertexComponents.GetType() == typeof(Vector2[]))
{
var verts = (Vector2[])vertexComponents;
var newVerts = new Vector3[verts.Length];
for (int i = 0; i != verts.Length; ++i) newVerts[i] = new Vector3(verts[i].X, verts[i].Y, 0);
positions.Add(newVerts);
}
else
{
Debug.ThrowError("HardwareMeshProcessor", "Unsuported VectorComponent type");
}
break;
}
}
// get triangle component types
if (loadColors) colorComponents = new List<TriangleColorComponent[]>();
if (loadNormals) normalComponents = new List<TriangleNormalComponent[]>();
if (loadUVs) uvComponents = new List<TriangleUVComponent[]>();
foreach (var key in mesh.TriangleComponentKeys)
{
switch (key.Key)
{
case TriangleComponentKeyTypes.ColorComponents:
if (loadColors) colorComponents.Add((TriangleColorComponent[])mesh.TriangleComponents[key.Value]);
break;
case TriangleComponentKeyTypes.NormalComponents:
if (loadNormals) normalComponents.Add((TriangleNormalComponent[])mesh.TriangleComponents[key.Value]);
break;
case TriangleComponentKeyTypes.UVComponents:
if (loadUVs) uvComponents.Add((TriangleUVComponent[])mesh.TriangleComponents[key.Value]);
break;
}
}
// create triangles with there own verticies
Verticies = new LinkedList<VertexProcessor>();
Triangles = new List<TriangleProcessor>();
foreach (var triangle in mesh.Triangles)
{
var newTriangle = new TriangleProcessor(triangle, this, loadColors, loadUVs, loadNormals);
}
// process (remove duplicate verticies from triangles)
const float tolerance = .002f;
int count = Triangles.Count-1, count2 = Triangles.Count;
for (int i = 0; i != count; ++i)
{
for (int vi = 0; vi != 3; ++vi)
{
var vertex = Triangles[i].Verticies[vi];
for (int i2 = i+1; i2 != count2; ++i2)
{
for (int vi2 = 0; vi2 != 3; ++vi2)
{
var vertex2 = Triangles[i2].Verticies[vi2];
if (vertex == vertex2) continue;
// position tolerance
bool canRemoveVertex = true;
for (int pi = 0; pi != vertex.Positions.Length; ++pi)
{
if (!vertex.Positions[pi].AproxEqualsBox(vertex2.Positions[pi], tolerance))
{
canRemoveVertex = false;
break;
}
}
// color tolerance
if (canRemoveVertex && loadColors)
{
for (int pi = 0; pi != vertex.Colors.Length; ++pi)
{
if (!vertex.Colors[pi].AproxEqualsBox(vertex2.Colors[pi], tolerance))
{
canRemoveVertex = false;
break;
}
}
}
// normal tolerance
if (canRemoveVertex && loadNormals)
{
for (int pi = 0; pi != vertex.Normals.Length; ++pi)
{
if (!vertex.Normals[pi].AproxEqualsBox(vertex2.Normals[pi], tolerance))
{
canRemoveVertex = false;
break;
}
}
}
// uv tolerance
if (canRemoveVertex && loadUVs)
{
for (int pi = 0; pi != vertex.UVs.Length; ++pi)
{
if (!vertex.UVs[pi].AproxEqualsBox(vertex2.UVs[pi], tolerance))
{
canRemoveVertex = false;
break;
}
}
}
// remove vertex
if (canRemoveVertex)
{
Verticies.Remove(vertex2);
Triangles[i2].Verticies[vi2] = vertex;
}
}
}
}
}
// process (set vertex indicies)
int index = 0;
foreach (var vertex in Verticies)
{
vertex.Index = index;
++index;
}
}
public static void Write(BinaryWriter writer, SoftwareModel softwareModel, SoftwareMesh softwareMesh, bool loadColors, bool loadUVs, bool loadNormals)
{
List<BufferLayoutElement> elements;
float[] vertices;
int[] indices;
initData(softwareMesh, loadColors, loadUVs, loadNormals, out elements, out vertices, out indices);
// name
writer.Write(softwareMesh.Name);
// material
int materialIndex = -1;
if (softwareMesh.Material != null)
{
for (int i = 0; i != softwareModel.Materials.Count; ++i)
{
if (softwareMesh.Material == softwareModel.Materials[i])
{
materialIndex = i;
break;
}
}
}
writer.Write(materialIndex);
// elements
writer.Write(elements.Count);
foreach (var element in elements)
{
writer.Write((int)element.Type);
writer.Write((int)element.Usage);
writer.Write(element.StreamIndex);
writer.Write(element.UsageIndex);
writer.Write(element.FloatOffset);
}
// vertices
writer.Write(vertices.Length);
foreach (var vertex in vertices)
{
writer.Write(vertex);
}
// indices
writer.Write(indices.Length);
foreach (var index in indices)
{
writer.Write(index);
}
}